# File Upload

> A drop zone over a real file input: the border marches when files hover, each file gets a row with a thumbnail and a rolling progress, too-big files say so.

Forms · upload, drag-and-drop, files, progress · HTML, CSS, vanilla JS · no dependencies · updated 2026-10-21
Demo: https://kodza.dev/components/file-upload/

## Files

The code below, served as files: byte for byte what the Kodza site copies (the CSS includes its theme guard).

- [`kodza-file-upload.css`](https://kodza.dev/registry/file-upload/kodza-file-upload.css) · 14.9 KB
- [`kodza-file-upload.js`](https://kodza.dev/registry/file-upload/kodza-file-upload.js) · 9.9 KB
- [`kodza-file-upload.html`](https://kodza.dev/registry/file-upload/kodza-file-upload.html) · 0.8 KB · the markup, to adapt and paste into your page

**Can you run shell commands? Download the CSS and the JS, don't retype them.** Retyping costs thousands of tokens and can drop or change lines of the CSS. Put the files where your stack expects them (Use it says where: change the `-o` paths):

```bash
curl -fsSL --create-dirs -o kodza/kodza-file-upload.css https://kodza.dev/registry/file-upload/kodza-file-upload.css
curl -fsSL --create-dirs -o kodza/kodza-file-upload.js https://kodza.dev/registry/file-upload/kodza-file-upload.js
```

Then load the files from your page as Use it shows, instead of pasting the content. The HTML is the part you adapt (text, links, modifiers): paste it from the Code section. Copy the CSS and the JS from the Code section only if you can't run commands, exactly as they are. (Windows PowerShell: `curl.exe`.)

## API

- Root: `.kodza-upload`
- Variables (set them on the root element itself: it declares its own defaults):
  - `--kz-upload-bg: #ffffff`
  - `--kz-upload-fg: #0a0a0a`
  - `--kz-upload-muted: rgba(10, 10, 10, 0.6)`
  - `--kz-upload-line: rgba(10, 10, 10, 0.24)`
  - `--kz-upload-soft: rgba(10, 10, 10, 0.05)`
  - `--kz-upload-ink: #0a0a0a`
  - `--kz-upload-on-ink: #ffffff`
  - `--kz-upload-radius: 16px`
  - `--kz-upload-ease: cubic-bezier(0.22, 1, 0.36, 1)`
- Attributes:
  - `data-max-mb` (e.g. `10`)
- Events: `kodza:files` (bubbling, from the root)
- Hooks on the root element: `root.kodzaUpload`, `root.kodzaAdd` (see the comment at the top of the JS)
- Lifecycle: `kodza:init` / `kodza:destroy` on `document`, with `{ detail: { root } }` to target a container.

## Dark mode

The values Kodza uses on a dark background (`#0a0a0a`). For a page that follows the system theme, add them after the component's CSS:

```css
@media (prefers-color-scheme: dark) {
  .kodza-upload {
    --kz-upload-bg: #161616;
    --kz-upload-fg: #f2f2f0;
    --kz-upload-muted: rgba(242, 242, 240, 0.62);
    --kz-upload-line: rgba(255, 255, 255, 0.26);
    --kz-upload-soft: rgba(255, 255, 255, 0.07);
    --kz-upload-ink: #f2f2f0;
    --kz-upload-on-ink: #0a0a0a;
  }
}
```

A site with its own theme switch puts the same rules under its dark selector instead (`[data-theme="dark"] .kodza-upload { … }`); a single dark section, under that section's class.

## Use it

### Plain HTML page

- CSS: `kodza/kodza-file-upload.css` next to the page (the Files commands as they are), linked in `<head>`: `<link rel="stylesheet" href="kodza/kodza-file-upload.css">`. Without a shell, paste it in a `<style>` in `<head>` instead. It only touches `kodza-` classes.
- HTML: where the component goes. Paste it as many times as you need: instances never interfere.
- JS: `kodza/kodza-file-upload.js`, loaded with `<script src="kodza/kodza-file-upload.js" defer></script>` in `<head>`. Without a shell, paste it in a `<script>` before `</body>` (or in `<head>`: it waits for the page). One copy per page, whatever the number of instances.
- Restyle with the `--kz-…` variables, set on the component's root element itself (the root declares its own defaults, so a value on an ancestor is ignored), and with the modifiers / attributes listed under API.
- Font: it takes the page's own. The Kodza look is Geist: `<link rel="stylesheet" href="https://fonts.googleapis.com/css2?family=Geist:wght@400;500;600;700&family=Geist+Mono:wght@400;500&display=swap">`.
- Content added later (AJAX navigation, a SPA route, a builder preview): start it with `document.dispatchEvent(new CustomEvent('kodza:init', { detail: { root: container } }))`; before removing it, the same call with `'kodza:destroy'` stops it and puts the original markup back.

### Claude artifact (claude.ai)

- Paste the CSS in a `<style>` and the JS in a `<script>` at the end, in the artifact itself: it loads stylesheets only from Google Fonts and scripts only from a few CDNs, so no `<link>` or `<script src>` to Kodza.
- Writing the artifact file with a shell? Insert the downloaded files (Files) with a command instead of retyping them: a line `KODZA-CSS` alone inside the `<style>`, `KODZA-JS` inside the `<script>`, then `sed -e '/^KODZA-CSS$/{r kodza/kodza-file-upload.css' -e 'd' -e '}' -e '/^KODZA-JS$/{r kodza/kodza-file-upload.js' -e 'd' -e '}' page.html > artifact.html`.
- Font: load Geist from Google Fonts (allowed): `<link rel="stylesheet" href="https://fonts.googleapis.com/css2?family=Geist:wght@400;500;600;700&family=Geist+Mono:wght@400;500&display=swap">`.
- Dark mode: the viewer sets `data-theme="dark"` or `"light"` on `<html>`, or nothing when it follows the system. Write the Dark mode rules twice: inside `@media (prefers-color-scheme: dark)` with `:root:not([data-theme="light"])` in front of each selector, and with `:root[data-theme="dark"]` in front of each selector.
- Forms: there is nowhere to send them. Handle `submit` in your script with `event.preventDefault()` and show the result in the page.

### WordPress

- HTML: a **Custom HTML** block (or a pattern / template part). WordPress keeps this markup as it is only for users allowed to post unfiltered HTML (Administrators; Super Admins on multisite): for anyone else it strips tags such as `<svg>`, `<input>` or `<dialog>`, so add it from the theme (a pattern or template part) instead.
- CSS and JS: the downloaded files go in the theme, under `wp-content/themes/<your-theme>/kodza/` (the child theme if there is one), enqueued from its functions.php (or a code-snippets plugin):
  ```php
  add_action('wp_enqueue_scripts', function () {
    $dir = get_stylesheet_directory() . '/kodza/';
    $uri = get_stylesheet_directory_uri() . '/kodza/';
    wp_enqueue_style('kodza-file-upload', $uri . 'kodza-file-upload.css', [], filemtime($dir . 'kodza-file-upload.css'));
    wp_enqueue_script('kodza-file-upload', $uri . 'kodza-file-upload.js', [], filemtime($dir . 'kodza-file-upload.js'), true);
  });
  ```
  Scoped to `kodza-` classes, the CSS never touches the theme. One copy of the JS, whatever the number of blocks.
- No access to the theme files? The CSS can also go, as it is, in **Appearance → Customize → Additional CSS** (classic theme) or **Styles → Additional CSS** in the Site Editor (block theme).
- Theme with AJAX page transitions: fire `kodza:init` on the new content after each swap (and `kodza:destroy` on the old one).
- Performance plugin (WP Rocket, LiteSpeed Cache, Perfmatters…) with **Delay JavaScript execution** turned on: add `kodza` to the scripts it must not delay. Otherwise the component waits for the visitor's first scroll, tap or mouse move, and that first click can be lost.
- Colours: by default, match the theme's palette. After the component's CSS, point these variables at the theme's colours, on the component root, Kodza's value as the fallback:
  `.kodza-upload { --kz-upload-fg: var(TEXT, #0a0a0a); --kz-upload-bg: var(BACKGROUND, #ffffff); --kz-upload-ink: var(ACCENT, #0a0a0a); --kz-upload-on-ink: var(BACKGROUND, #ffffff); }`
  TEXT, BACKGROUND and ACCENT (the colour the theme fills its own buttons with) are the theme's own colour variables — block themes (theme.json, like Twenty Twenty-Five): `--wp--preset--color--contrast`, `--wp--preset--color--base`, `--wp--preset--color--contrast` (they fill their buttons with it; their accent-1… colours are decorative); Astra: `--ast-global-color-2`, `--ast-global-color-4`, `--ast-global-color-0`; Kadence: `--global-palette3`, `--global-palette9`, `--global-palette1`; GeneratePress: `--contrast`, `--base-3`, `--accent`; Blocksy: `--theme-palette-color-4`, `--theme-palette-color-8`, `--theme-palette-color-1`. Use only these names, and only if the site really has them (the theme's CSS, or Styles → Colors): the `--wp--preset--color--black`, `--white`, `--vivid-…` that WordPress adds everywhere are not the theme's palette. Another theme, or one without these variables (Hello Elementor, OceanWP): leave the variables alone, it keeps Kodza's monochrome; same when the developer asks for monochrome or the Kodza look. Leave the translucent greys (`rgba(10, 10, 10, …)`) as they are: they suit any light background. On a dark palette, set the other variables from Dark mode too.
- WordPress turns straight quotes and `--` into typographic ones in the text of a Custom HTML block (not inside `<code>` or `<pre>`).

#### With Elementor

- HTML: an **HTML** widget (Elementor shows it to administrators only). It keeps the code exactly as pasted, straight quotes included.
- CSS and JS: as above. Elementor's Site Settings → Theme Style styles every button, field, link and image of the page, components included; the theme guard at the end of the CSS keeps the component's buttons, fields and link colours as they are.
- The Elementor editor redraws each widget after the page has loaded: without the script below, the component stays still in the editor preview (the published page works). Add it once per site, in the footer like the component's script (`kodza/elementor-editor.js`, or a code-snippets plugin):

```js
// Kodza in the Elementor editor: the editor redraws each HTML widget after the page has loaded.
// Start Kodza in what it draws, stop it in what it replaces or removes. Once per site.
window.addEventListener('elementor/frontend/init', () => {
  if (!elementorFrontend.isEditMode()) return;
  class KodzaWidget extends elementorModules.frontend.handlers.Base {
    onInit() {
      super.onInit();
      this.kodza = [...this.$element[0].children];
      document.dispatchEvent(new CustomEvent('kodza:init', { detail: { root: this.$element[0] } }));
    }
    onDestroy() {
      super.onDestroy();
      this.kodza.forEach((root) => document.dispatchEvent(new CustomEvent('kodza:destroy', { detail: { root } })));
    }
  }
  elementorFrontend.elementsHandler.attachHandler('html', KodzaWidget);
});
```

- No child theme: everything can go in the HTML widget instead, `<style>` with the CSS, the HTML, then `<script>` with the JS. It works on the page and in the editor without the script above.

### Shopify

- Files: `assets/kodza-file-upload.css` and `assets/kodza-file-upload.js` (the Files commands with `-o assets/…`).
- In the section: `{{ 'kodza-file-upload.css' | asset_url | stylesheet_tag }}` and `<script src="{{ 'kodza-file-upload.js' | asset_url }}" defer></script>`, then the HTML.
- The theme editor re-renders sections: restart them with
  `document.addEventListener('shopify:section:load', (e) => document.dispatchEvent(new CustomEvent('kodza:init', { detail: { root: e.target } })));`
  and the same with `shopify:section:unload` → `kodza:destroy`.

### React / Next.js

- Files, side by side (e.g. in `components/kodza/`): `FileUpload.tsx` (below), the CSS block under Code saved as `file-upload.css` and the JS block as `file-upload.js`, both as they are. The HTML block is already inside the component: skip it.
- Use it: `import { FileUpload } from '@/components/kodza/FileUpload';` then `<FileUpload />`. Props: `maxMb` (`data-max-mb`: "10"), `vars` (the `--kz-…` variables listed under API, e.g. `vars={{ '--kz-upload-bg': … }}`), `onFiles` (the `kodza:files` event), `className`, `style` and the other props of its `<div>` (`onClick`, `aria-…`).
- Next.js App Router: it is a Client Component already (`'use client'`). Pages Router: Next.js takes global CSS only in `pages/_app`, so move the `import './file-upload.css'` line there.
- Safe under StrictMode, client-side navigation and prop changes: when a prop changes, the `key` gives React a fresh element, `kodza:destroy` stops the script on the old one and `kodza:init` starts it on the new one.

```tsx
'use client';
// Kodza — File Upload, for React. From https://kodza.dev/components/file-upload/
// Kodza License: free to use, client work included. Not to resell or redistribute, ported or not: https://kodza.dev/docs/#print-license
// Next to this file: file-upload.css and file-upload.js, the component's CSS and JS from Kodza, as they are.
// Yours to edit: the markup is plain JSX below.
// The script changes this markup once React has rendered it (it adds layers, splits text, moves
// nodes), so React must not patch it afterwards. When a prop changes, the key gives React a fresh
// element: kodza:destroy stops the script on the old one, kodza:init starts it on the new one.
import { useRef, useEffect, type ComponentPropsWithoutRef, type ComponentRef, type CSSProperties } from 'react';
import './file-upload.css';

export type FileUploadProps = Omit<ComponentPropsWithoutRef<'div'>, "children" | "vars" | "maxMb" | "onFiles"> & {
  /** data-max-mb on the root (default: 10) */
  maxMb?: "10";
  /** Settings, as CSS variables on the root */
  vars?: {
    /** default: #ffffff */
    "--kz-upload-bg"?: string | number;
    /** default: #0a0a0a */
    "--kz-upload-fg"?: string | number;
    /** default: rgba(10, 10, 10, 0.6) */
    "--kz-upload-muted"?: string | number;
    /** default: rgba(10, 10, 10, 0.24) */
    "--kz-upload-line"?: string | number;
    /** default: rgba(10, 10, 10, 0.05) */
    "--kz-upload-soft"?: string | number;
    /** default: #0a0a0a */
    "--kz-upload-ink"?: string | number;
    /** default: #ffffff */
    "--kz-upload-on-ink"?: string | number;
    /** default: 16px */
    "--kz-upload-radius"?: string | number;
    /** default: cubic-bezier(0.22, 1, 0.36, 1) */
    "--kz-upload-ease"?: string | number;
  };
  /** "kodza:files", fired by the script (bubbles from the root) */
  onFiles?: (event: CustomEvent) => void;
  className?: string;
};

export function FileUpload({ maxMb = "10", vars, onFiles, className, style, ...rest }: FileUploadProps) {
  const ref = useRef<ComponentRef<'div'>>(null);
  const classes = ["kodza-upload", className].filter(Boolean).join(' ');
  // Everything the markup is made of: when it changes, React gets a fresh element (see the top)
  const key = JSON.stringify([classes, maxMb, vars, style, rest]);

  // Starts the script on this element once React has rendered it, stops it when it goes
  useEffect(() => {
    const root = ref.current;
    let live = true;
    // @ts-ignore: a plain script, no types to find
    import('./file-upload.js').then(() => {
      if (live) document.dispatchEvent(new CustomEvent('kodza:init', { detail: { root } }));
    });
    return () => {
      live = false;
      document.dispatchEvent(new CustomEvent('kodza:destroy', { detail: { root } }));
    };
  }, [key]);

  useEffect(() => {
    const root = ref.current;
    if (!root || !onFiles) return;
    const listener = (event: Event) => onFiles(event as CustomEvent);
    root.addEventListener("kodza:files", listener);
    return () => root.removeEventListener("kodza:files", listener);
  }, [onFiles, key]);

  return (
    <div key={key} {...rest} className={classes} data-max-mb={maxMb} style={{ ...vars, ...style } as CSSProperties} ref={ref}>
      <label className="kodza-upload__zone">
        <input className="kodza-upload__input" type="file" name="files" multiple accept="image/*,.pdf,.zip" />
        {' '}
        <svg className="kodza-upload__border" aria-hidden="true">
          <rect rx="16" ry="16" />
        </svg>
        {' '}
        <span className="kodza-upload__icon" aria-hidden="true">
          <svg viewBox="0 0 24 24">
            <path className="kodza-upload__arrow" d="M12 15V4M7.5 8.5 12 4l4.5 4.5" />
            <path d="M4 14v3.5A2.5 2.5 0 0 0 6.5 20h11a2.5 2.5 0 0 0 2.5-2.5V14" />
          </svg>
        </span>
        {' '}
        <span className="kodza-upload__title">
          <span className="kodza-upload__words">
            <span>Drop files here, or <u>browse</u></span>
          </span>
        </span>
        {' '}
        <span className="kodza-upload__hint">Images, PDFs and ZIPs. 10 MB each, which is plenty.</span>
      </label>
      <ul className="kodza-upload__list" aria-live="polite" />
    </div>
  );
}
```

## Code

```html
<div class="kodza-upload" data-max-mb="10">
  <label class="kodza-upload__zone">
    <input class="kodza-upload__input" type="file" name="files" multiple accept="image/*,.pdf,.zip">
    <svg class="kodza-upload__border" aria-hidden="true"><rect rx="16" ry="16"/></svg>
    <span class="kodza-upload__icon" aria-hidden="true"><svg viewBox="0 0 24 24"><path class="kodza-upload__arrow" d="M12 15V4M7.5 8.5 12 4l4.5 4.5"/><path d="M4 14v3.5A2.5 2.5 0 0 0 6.5 20h11a2.5 2.5 0 0 0 2.5-2.5V14"/></svg></span>
    <span class="kodza-upload__title"><span class="kodza-upload__words"><span>Drop files here, or <u>browse</u></span></span></span>
    <span class="kodza-upload__hint">Images, PDFs and ZIPs. 10 MB each, which is plenty.</span>
  </label>
  <ul class="kodza-upload__list" aria-live="polite"></ul>
</div>
```

```css
/* Kodza License: free to use, client work included. Not to resell or redistribute, ported or not: https://kodza.dev/docs/#print-license */
/* Kodza — File Upload
   A drop zone over a real file input. Drag files over the page and the zone wakes up; over the
   zone, its dashed border starts to march, the arrow lifts and the title rolls to "Let go".
   Each file gets a row that opens up with a thumbnail, its size and a progress bar; the
   percentage rolls, a tick draws itself when it is done, and a file that is too big says so.
   Uploading is yours: set root.kodzaUpload = (file, onProgress) => Promise. Without it, files
   are simply attached to the input for the form.
   Everything is tuned with the --kz-upload-* variables. */
.kodza-upload {
  --kz-upload-bg: #ffffff;
  --kz-upload-fg: #0a0a0a;
  --kz-upload-muted: rgba(10, 10, 10, 0.6);
  --kz-upload-line: rgba(10, 10, 10, 0.24);
  --kz-upload-soft: rgba(10, 10, 10, 0.05);
  --kz-upload-ink: #0a0a0a;
  --kz-upload-on-ink: #ffffff;
  --kz-upload-radius: 16px;
  --kz-upload-ease: cubic-bezier(0.22, 1, 0.36, 1);

  display: grid;
  gap: 12px;
  width: 100%;
  max-width: 460px;
  color: var(--kz-upload-fg);
}

/* The zone: the whole thing is the label of the file input */
.kodza-upload__zone {
  position: relative;
  display: grid;
  justify-items: center;
  gap: 6px;
  padding: 36px 24px 32px;
  border-radius: var(--kz-upload-radius);
  background: var(--kz-upload-bg);
  text-align: center;
  cursor: pointer;
  transition: background-color 0.3s ease, transform 0.4s var(--kz-upload-ease);
}

.kodza-upload__input {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

/* The dashed border is an SVG rectangle, so it can march */
.kodza-upload__border {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  overflow: visible;
  pointer-events: none;
}

.kodza-upload__border rect {
  x: 1px;
  y: 1px;
  width: calc(100% - 2px);
  height: calc(100% - 2px);
  fill: none;
  stroke: var(--kz-upload-line);
  stroke-width: 1.5;
  stroke-dasharray: 6 6;
  transition: stroke 0.3s ease;
}

.kodza-upload__zone:hover .kodza-upload__border rect,
.kodza-upload.is-dragging .kodza-upload__border rect {
  stroke: var(--kz-upload-muted);
}

.kodza-upload.is-over .kodza-upload__border rect {
  stroke: var(--kz-upload-ink);
  animation: kodza-upload-march 0.6s linear infinite;
}

@keyframes kodza-upload-march {
  to {
    stroke-dashoffset: -12;
  }
}

.kodza-upload.is-over .kodza-upload__zone {
  background: var(--kz-upload-soft);
  transform: scale(1.015);
}

.kodza-upload__zone:has(.kodza-upload__input:focus-visible) {
  outline: 2px solid var(--kz-upload-fg);
  outline-offset: 3px;
}

.kodza-upload__icon {
  display: grid;
  place-items: center;
  width: 44px;
  height: 44px;
  margin-bottom: 6px;
  border-radius: 12px;
  background: var(--kz-upload-soft);
}

.kodza-upload__icon svg {
  width: 22px;
  height: 22px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.6;
  stroke-linecap: round;
  stroke-linejoin: round;
}

.kodza-upload__arrow {
  transition: transform 0.4s var(--kz-upload-ease);
}

.kodza-upload__zone:hover .kodza-upload__arrow {
  transform: translateY(-1.5px);
}

.kodza-upload.is-over .kodza-upload__arrow {
  animation: kodza-upload-lift 0.9s var(--kz-upload-ease) infinite alternate;
}

@keyframes kodza-upload-lift {
  from {
    transform: translateY(-1px);
  }

  to {
    transform: translateY(-4px);
  }
}

.kodza-upload__title {
  font-size: 15px;
  font-weight: 500;
}

.kodza-upload__words {
  display: inline-grid;
  overflow: hidden;
  vertical-align: bottom;
}

.kodza-upload__words > span {
  grid-area: 1 / 1;
}

.kodza-upload__title u {
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.kodza-upload__hint {
  font-size: 13px;
  color: var(--kz-upload-muted);
}

/* The files: each row opens up, then slides in */
.kodza-upload__list {
  display: grid;
  margin: 0;
  padding: 0;
  list-style: none;
}

.kodza-upload__item {
  display: grid;
  grid-template-rows: 0fr;
  transition: grid-template-rows 0.45s var(--kz-upload-ease);
}

.kodza-upload__item.is-shown {
  grid-template-rows: 1fr;
}

.kodza-upload__row {
  display: grid;
  grid-template-columns: 40px minmax(0, 1fr) auto;
  align-items: center;
  gap: 12px;
  min-height: 0;
  overflow: hidden;
  opacity: 0;
  transform: translateY(-6px);
  transition: opacity 0.3s ease, transform 0.45s var(--kz-upload-ease);
}

.kodza-upload__item.is-shown .kodza-upload__row {
  padding: 8px 0;
  opacity: 1;
  transform: none;
}

.kodza-upload__item + .kodza-upload__item .kodza-upload__row {
  border-top: 1px solid var(--kz-upload-soft);
}

.kodza-upload__thumb {
  display: grid;
  place-items: center;
  width: 40px;
  height: 40px;
  overflow: hidden;
  border-radius: 8px;
  background: var(--kz-upload-soft);
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 10px;
  font-weight: 600;
  text-transform: uppercase;
}

.kodza-upload__thumb img {
  width: 100%;
  height: 100%;
  object-fit: cover;
}

.kodza-upload__info {
  display: grid;
  gap: 5px;
  min-width: 0;
}

.kodza-upload__name {
  overflow: hidden;
  font-size: 14px;
  font-weight: 500;
  text-overflow: ellipsis;
  white-space: nowrap;
}

.kodza-upload__meta {
  display: flex;
  gap: 8px;
  font-family: ui-monospace, "SF Mono", Menlo, monospace;
  font-size: 12px;
  color: var(--kz-upload-muted);
}

.kodza-upload__status {
  display: inline-grid;
  overflow: hidden;
}

.kodza-upload__status > span {
  grid-area: 1 / 1;
  white-space: nowrap;
}

/* The bar fills, then folds away once done */
.kodza-upload__bar {
  height: 2px;
  overflow: hidden;
  border-radius: 2px;
  background: var(--kz-upload-soft);
  transition: opacity 0.4s ease 0.4s;
}

.kodza-upload__bar span {
  display: block;
  height: 100%;
  background: var(--kz-upload-ink);
  transform: scaleX(var(--kz-progress, 0));
  transform-origin: left;
  transition: transform 0.3s var(--kz-upload-ease);
}

.kodza-upload__item.is-done .kodza-upload__bar,
.kodza-upload__item.is-error .kodza-upload__bar,
.kodza-upload__item.is-ready .kodza-upload__bar {
  opacity: 0;
}

.kodza-upload__item.is-error .kodza-upload__meta {
  color: var(--kz-upload-fg);
  font-weight: 500;
}

/* The end of the row: a tick when done, a cross to remove */
.kodza-upload__end {
  display: flex;
  align-items: center;
  gap: 4px;
}

.kodza-upload__tick {
  width: 18px;
  height: 18px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
  stroke-linejoin: round;
  stroke-dasharray: 1;
  stroke-dashoffset: 1;
  transition: stroke-dashoffset 0.45s var(--kz-upload-ease) 0.15s;
}

.kodza-upload__item.is-done .kodza-upload__tick {
  stroke-dashoffset: 0;
}

.kodza-upload__remove {
  display: grid;
  place-items: center;
  width: 28px;
  height: 28px;
  padding: 0;
  border: 0;
  border-radius: 50%;
  background: none;
  color: var(--kz-upload-muted);
  cursor: pointer;
  transition: background-color 0.2s ease, color 0.2s ease;
}

.kodza-upload__remove:hover {
  background: var(--kz-upload-soft);
  color: var(--kz-upload-fg);
}

.kodza-upload__remove:focus-visible {
  outline: 2px solid var(--kz-upload-fg);
  outline-offset: 1px;
}

.kodza-upload__remove svg {
  width: 12px;
  height: 12px;
  fill: none;
  stroke: currentColor;
  stroke-width: 1.8;
  stroke-linecap: round;
}

@media (prefers-reduced-motion: reduce) {
  .kodza-upload.is-over .kodza-upload__border rect,
  .kodza-upload.is-over .kodza-upload__arrow {
    animation: none;
  }

  .kodza-upload__zone,
  .kodza-upload__item,
  .kodza-upload__row,
  .kodza-upload__bar,
  .kodza-upload__bar span,
  .kodza-upload__tick {
    transition-duration: 0.01ms !important;
    transition-delay: 0s !important;
  }
}

/* Theming example — on a dark background:
.dark-section .kodza-upload {
  --kz-upload-bg: #161616;
  --kz-upload-fg: #f2f2f0;
  --kz-upload-muted: rgba(242, 242, 240, 0.62);
  --kz-upload-line: rgba(255, 255, 255, 0.26);
  --kz-upload-soft: rgba(255, 255, 255, 0.07);
  --kz-upload-ink: #f2f2f0;
  --kz-upload-on-ink: #0a0a0a;
}
*/

/* kodza-guard c0f625c799e7 — generated by Kodza, do not edit.
   Theme guard: keeps a site's own CSS (WordPress themes, Bootstrap, CSS resets…) off this
   component. :not(#_) is always true and weighs as much as an id, so these lines win over
   theme rules made of classes and tags. Customise the component through its --kz-* variables. */

/* What the browser gives, where the component sets it only in some states: at the lowest weight, so its own rules below put it back */

:where(.kodza-upload__zone):not(#_) {
  outline: revert;
  outline-offset: revert;
}

/* What the browser gives, on everything the component leaves to it */

.kodza-upload:not(#_),
.kodza-upload__icon:not(#_),
.kodza-upload__arrow:not(#_),
.kodza-upload__title:not(#_),
.kodza-upload__words:not(#_),
.kodza-upload__hint:not(#_),
.kodza-upload__words span:where(:not([class*="kodza-"])):not(#_) {
  box-sizing: revert;
}

.kodza-upload__zone:not(#_) {
  border: revert;
  margin: revert;
  text-decoration: revert;
  list-style: revert;
  box-sizing: revert;
  float: revert;
  box-shadow: revert;
  appearance: revert;
  max-width: revert;
  max-height: revert;
  color: revert;
  font-family: revert;
  font-size: revert;
  font-weight: revert;
  font-style: revert;
  line-height: revert;
  letter-spacing: revert;
  text-transform: revert;
  text-underline-offset: revert;
  text-indent: revert;
  text-shadow: revert;
  vertical-align: revert;
}

.kodza-upload__input:not(#_) {
  border: revert;
  margin: revert;
  padding: revert;
  border-radius: revert;
  outline: revert;
  text-decoration: revert;
  transition: revert;
  list-style: revert;
  box-sizing: revert;
  float: revert;
  background-color: revert;
  background-image: revert;
  box-shadow: revert;
  outline-offset: revert;
  appearance: revert;
  max-width: revert;
  max-height: revert;
  color: revert;
  font-family: revert;
  font-size: revert;
  font-weight: revert;
  font-style: revert;
  line-height: revert;
  letter-spacing: revert;
  text-transform: revert;
  text-underline-offset: revert;
  text-align: revert;
  text-indent: revert;
  text-shadow: revert;
  vertical-align: revert;
  white-space: revert;
  min-height: revert;
}

.kodza-upload__border:not(#_) {
  border: revert;
  margin: revert;
  padding: revert;
  border-radius: revert;
  outline: revert;
  text-decoration: revert;
  transition: revert;
  list-style: revert;
  box-sizing: revert;
  float: revert;
  background-color: revert;
  background-image: revert;
  box-shadow: revert;
  outline-offset: revert;
  appearance: revert;
  max-width: revert;
  max-height: revert;
  color: revert;
  font-family: revert;
  font-size: revert;
  font-weight: revert;
  font-style: revert;
  line-height: revert;
  letter-spacing: revert;
  text-transform: revert;
  text-underline-offset: revert;
  text-align: revert;
  text-indent: revert;
  text-shadow: revert;
  vertical-align: revert;
}

.kodza-upload__list:not(#_) {
  border: revert;
  border-radius: revert;
  outline: revert;
  text-decoration: revert;
  transition: revert;
  box-sizing: revert;
  float: revert;
  position: revert;
  background-color: revert;
  background-image: revert;
  box-shadow: revert;
  outline-offset: revert;
  appearance: revert;
  max-width: revert;
  max-height: revert;
  color: revert;
  font-family: revert;
  font-size: revert;
  font-weight: revert;
  font-style: revert;
  line-height: revert;
  letter-spacing: revert;
  text-transform: revert;
  text-underline-offset: revert;
  text-align: revert;
  text-indent: revert;
  text-shadow: revert;
  vertical-align: revert;
}

.kodza-upload__icon svg:where(:not([class*="kodza-"])):not(#_) {
  border: revert;
  margin: revert;
  padding: revert;
  border-radius: revert;
  outline: revert;
  text-decoration: revert;
  transition: revert;
  list-style: revert;
  box-sizing: revert;
  float: revert;
  position: revert;
  background-color: revert;
  background-image: revert;
  box-shadow: revert;
  outline-offset: revert;
  appearance: revert;
  max-width: revert;
  max-height: revert;
  color: revert;
  font-family: revert;
  font-size: revert;
  font-weight: revert;
  font-style: revert;
  line-height: revert;
  letter-spacing: revert;
  text-transform: revert;
  text-underline-offset: revert;
  text-align: revert;
  text-indent: revert;
  text-shadow: revert;
  vertical-align: revert;
}

.kodza-upload__words u:where(:not([class*="kodza-"])):not(#_) {
  border: revert;
  margin: revert;
  padding: revert;
  border-radius: revert;
  outline: revert;
  transition: revert;
  list-style: revert;
  box-sizing: revert;
  float: revert;
  position: revert;
  background-color: revert;
  background-image: revert;
  box-shadow: revert;
  outline-offset: revert;
  appearance: revert;
  max-width: revert;
  max-height: revert;
  color: revert;
  font-family: revert;
  font-size: revert;
  font-weight: revert;
  font-style: revert;
  line-height: revert;
  letter-spacing: revert;
  text-transform: revert;
  text-decoration-line: revert;
  text-decoration-color: revert;
  text-decoration-style: revert;
  text-align: revert;
  text-indent: revert;
  text-shadow: revert;
  vertical-align: revert;
}

.kodza-upload__input:not(#_):where(:not([hidden])),
.kodza-upload__border:not(#_):where(:not([hidden])),
.kodza-upload__icon svg:where(:not([class*="kodza-"])):not(#_):where(:not([hidden])),
.kodza-upload__words u:where(:not([class*="kodza-"])):not(#_):where(:not([hidden])) {
  display: revert;
}

.kodza-upload__input:not(#_):where([hidden]),
.kodza-upload__border:not(#_):where([hidden]),
.kodza-upload__icon svg:where(:not([class*="kodza-"])):not(#_):where([hidden]),
.kodza-upload__words u:where(:not([class*="kodza-"])):not(#_):where([hidden]) {
  display: none;
}

/* The component's own rules, one step stronger: real buttons and fields, what it sets on tags themes style (links, lists, headings, images…), and the root width (a theme may narrow it, never widen it) */

.kodza-upload:not(#_) {
  width: min(100%, 460px);
}

.kodza-upload__zone:not(#_) {
  position: relative;
  display: grid;
  padding: 36px 24px 32px;
  border-radius: var(--kz-upload-radius);
  background: var(--kz-upload-bg);
  text-align: center;
  transition: background-color 0.3s ease, transform 0.4s var(--kz-upload-ease);
}

.kodza-upload__input:not(#_) {
  position: absolute;
  inset: 0;
  width: 100%;
  height: 100%;
  opacity: 0;
  cursor: pointer;
}

.kodza-upload__border:not(#_) {
  position: absolute;
}

.kodza-upload.is-over .kodza-upload__zone:not(#_) {
  background: var(--kz-upload-soft);
}

.kodza-upload__zone:has(.kodza-upload__input:focus-visible):not(#_) {
  outline: 2px solid var(--kz-upload-fg);
  outline-offset: 3px;
}

.kodza-upload__title u:not(#_) {
  text-decoration-thickness: 1px;
  text-underline-offset: 3px;
}

.kodza-upload__list:not(#_) {
  display: grid;
  margin: 0;
  padding: 0;
  list-style: none;
}

@media (prefers-reduced-motion: reduce) {
  .kodza-upload__zone:not(#_) {
    transition-duration: 0.01ms !important;
    transition-delay: 0s !important;
  }
}
```

```js
// Kodza License: free to use, client work included. Not to resell or redistribute, ported or not: https://kodza.dev/docs/#print-license
// Kodza — File Upload
// Wakes the zone up while files are dragged over the page, takes drops and picks, and gives
// each file a row: thumbnail, size, progress, done or error. Files too big (data-max-mb) are
// refused with a reason. If root.kodzaUpload = (file, onProgress) => Promise is set, each file
// is uploaded through it; otherwise the files stay attached to the input for the form.
// root.kodzaAdd(files) adds files from a script. Fires "kodza:files" with { files }.
(() => {
  const SELECTOR = '.kodza-upload';
  const reduceMotion = window.matchMedia('(prefers-reduced-motion: reduce)').matches;
  const ease = 'cubic-bezier(0.22, 1, 0.36, 1)';
  const size = (bytes) => (bytes < 1024 ? `${bytes} B` : bytes < 1048576 ? `${(bytes / 1024).toFixed(0)} KB` : `${Number((bytes / 1048576).toFixed(1))} MB`);
  const tick = '<svg class="kodza-upload__tick" viewBox="0 0 18 18" aria-hidden="true"><path d="M4 9.5l3.2 3 6.8-7.5" pathLength="1"/></svg>';
  const cross = '<svg viewBox="0 0 12 12" aria-hidden="true"><path d="M3 3l6 6M9 3 3 9"/></svg>';

  // A word rolls to its new value
  const roll = (box, text) => {
    const prev = box.lastElementChild;
    if (prev && prev.textContent === text) return;
    const span = Object.assign(document.createElement('span'), { textContent: text });
    box.append(span);
    if (!prev) return;
    if (reduceMotion) return prev.remove();
    const timing = { duration: 380, easing: ease };
    prev.animate([{ transform: 'none' }, { transform: 'translateY(-110%)' }], { ...timing, fill: 'forwards' }).finished.then(() => prev.remove());
    span.animate([{ transform: 'translateY(110%)' }, { transform: 'none' }], timing);
  };

  const hasFiles = (event) => [...(event.dataTransfer?.types || [])].includes('Files');

  // One instance. Everything it starts is tied to `signal`, so kodza:destroy stops it all
  function mount(root, signal) {
    const input = root.querySelector('.kodza-upload__input');
    const zone = root.querySelector('.kodza-upload__zone');
    const list = root.querySelector('.kodza-upload__list');
    const words = root.querySelector('.kodza-upload__words');
    if (!input || !zone || !list) return;

    // Files dragged anywhere over the page: the zone wakes up
    let depth = 0;
    window.addEventListener('dragenter', (event) => {
      if (!hasFiles(event)) return;
      depth++;
      root.classList.add('is-dragging');
    }, { signal });
    window.addEventListener('dragleave', () => {
      depth = Math.max(0, depth - 1);
      if (!depth) root.classList.remove('is-dragging');
    }, { signal });
    window.addEventListener('drop', () => {
      depth = 0;
      root.classList.remove('is-dragging', 'is-over');
    }, { signal });
    // A drop next to the zone should not open the file in the tab
    window.addEventListener('dragover', (event) => hasFiles(event) && event.preventDefault(), { signal });
    const maxBytes = (Number(root.dataset.maxMb) || 0) * 1048576;
    const idle = words?.firstElementChild?.cloneNode(true);
    const attached = new DataTransfer();

    const setWords = (over) => {
      if (!words) return;
      const prev = words.lastElementChild;
      if (over === prev.classList.contains('is-over')) return;
      const span = over ? Object.assign(document.createElement('span'), { textContent: 'Let go. We have got it.', className: 'is-over' }) : idle.cloneNode(true);
      words.append(span);
      if (reduceMotion) return prev.remove();
      const timing = { duration: 380, easing: ease };
      prev.animate([{ transform: 'none' }, { transform: 'translateY(-110%)' }], { ...timing, fill: 'forwards' }).finished.then(() => prev.remove());
      span.animate([{ transform: 'translateY(110%)' }, { transform: 'none' }], timing);
    };

    const row = (file) => {
      const item = document.createElement('li');
      item.className = 'kodza-upload__item';
      const ext = (file.name.split('.').pop() || '').slice(0, 4);
      item.innerHTML = `
        <div class="kodza-upload__row">
          <span class="kodza-upload__thumb" aria-hidden="true"></span>
          <span class="kodza-upload__info">
            <span class="kodza-upload__name"></span>
            <span class="kodza-upload__meta"><span>${size(file.size)}</span><span class="kodza-upload__status"></span></span>
            <span class="kodza-upload__bar"><span></span></span>
          </span>
          <span class="kodza-upload__end">${tick}<button class="kodza-upload__remove" type="button">${cross}</button></span>
        </div>`;
      item.querySelector('.kodza-upload__name').textContent = file.name;
      item.querySelector('.kodza-upload__remove').setAttribute('aria-label', `Remove ${file.name}`);
      const thumb = item.querySelector('.kodza-upload__thumb');
      if (file.type.startsWith('image/')) {
        const img = document.createElement('img');
        img.alt = '';
        img.src = URL.createObjectURL(file);
        img.onload = () => URL.revokeObjectURL(img.src);
        thumb.append(img);
      } else {
        thumb.textContent = ext;
      }
      return item;
    };

    const remove = (item, file) => {
      item.classList.remove('is-shown');
      item.kzCancel?.();
      // Take it off the input too
      const keep = new DataTransfer();
      [...attached.files].filter((f) => f !== file).forEach((f) => keep.items.add(f));
      attached.items.clear();
      [...keep.files].forEach((f) => attached.items.add(f));
      input.files = attached.files;
      setTimeout(() => item.remove(), reduceMotion ? 0 : 450);
    };

    const add = (files) => {
      const added = [...files];
      added.forEach((file, i) => {
        const item = row(file);
        const status = item.querySelector('.kodza-upload__status');
        const bar = item.querySelector('.kodza-upload__bar');
        list.append(item);
        // One after the other: the row opens, then fills
        setTimeout(() => item.classList.add('is-shown'), reduceMotion ? 0 : 30 + i * 90);
        item.querySelector('.kodza-upload__remove').addEventListener('click', () => remove(item, file), { signal });

        if (maxBytes && file.size > maxBytes) {
          item.classList.add('is-error');
          roll(status, `Too big. The limit is ${size(maxBytes)}.`);
          return;
        }
        attached.items.add(file);
        input.files = attached.files;
        const upload = root.kodzaUpload;
        if (typeof upload !== 'function') {
          item.classList.add('is-ready');
          roll(status, 'Ready');
          return;
        }
        let cancelled = false;
        item.kzCancel = () => (cancelled = true);
        roll(status, '0%');
        upload(file, (fraction) => {
          if (cancelled) return;
          const pct = Math.max(0, Math.min(100, Math.round(fraction * 100)));
          bar.style.setProperty('--kz-progress', pct / 100);
          roll(status, `${pct}%`);
        }).then(() => {
          if (cancelled) return;
          bar.style.setProperty('--kz-progress', 1);
          item.classList.add('is-done');
          roll(status, 'Done');
        }).catch((error) => {
          if (cancelled) return;
          item.classList.add('is-error');
          roll(status, error?.message || 'Upload failed. Try again.');
        });
      });
      root.dispatchEvent(new CustomEvent('kodza:files', { detail: { files: added }, bubbles: true }));
    };
    root.kodzaAdd = add;
    signal.addEventListener('abort', () => delete root.kodzaAdd);

    input.addEventListener('change', () => {
      // The picker replaces the input's files: take them, then put the whole set back
      const picked = [...input.files];
      input.files = attached.files;
      add(picked);
    }, { signal });
    zone.addEventListener('dragover', (event) => {
      if (!hasFiles(event)) return;
      event.preventDefault();
      root.classList.add('is-over');
      setWords(true);
    }, { signal });
    zone.addEventListener('dragleave', (event) => {
      if (zone.contains(event.relatedTarget)) return;
      root.classList.remove('is-over');
      setWords(false);
    }, { signal });
    zone.addEventListener('drop', (event) => {
      event.preventDefault();
      root.classList.remove('is-over');
      setWords(false);
      if (event.dataTransfer?.files.length) add(event.dataTransfer.files);
    }, { signal });
  }

  // Kodza lifecycle, the same in every component: `kodza:init` starts the instances inside
  // event.detail.root (the whole page by default), `kodza:destroy` stops them and puts their
  // markup back. For themes and apps that swap content without a page load.
  const instances = new WeakMap();
  const find = (scope = document) => [scope, ...scope.querySelectorAll(SELECTOR)].filter((el) => el.matches?.(SELECTOR));
  const init = (scope) => find(scope).forEach((root) => {
    if (root.classList.contains('is-ready')) return; // already running, maybe from another copy of this script
    const controller = new AbortController();
    instances.set(root, { controller, html: root.innerHTML, attrs: [...root.attributes].map((a) => [a.name, a.value]) });
    mount(root, controller.signal);
    root.classList.add('is-ready');
  });
  const destroy = (scope) => find(scope).forEach((root) => {
    const instance = instances.get(root);
    if (!instance) return;
    instances.delete(root);
    instance.controller.abort();
    [...root.attributes].forEach((a) => root.removeAttribute(a.name));
    instance.attrs.forEach(([name, value]) => root.setAttribute(name, value));
    root.innerHTML = instance.html;
  });
  document.addEventListener('kodza:init', (event) => init(event.detail?.root));
  document.addEventListener('kodza:destroy', (event) => destroy(event.detail?.root));
  init();
  // Loaded in <head>, the script runs before the markup exists: once more when it is parsed
  if (document.readyState === 'loading') document.addEventListener('DOMContentLoaded', () => init(), { once: true });
})();
```

Free to use, from Kodza (https://kodza.dev).