Writing Docs

Writing Remotion Documentation

Documentation lives in packages/docs/docs as .mdx files.

Adding a new page

1. Create a new .mdx file in packages/docs/docs 2. Add the document to packages/docs/sidebars.ts 3. Write the content following guidelines below 4. Run bun render-cards.ts in packages/docs to generate social preview cards

Breadcrumb (`crumb`): If a documentation page belongs to a package, add crumb: '@remotion/package-name' to the frontmatter. This displays the package name as a breadcrumb above the title.

---
image: /generated/articles-docs-my-package-my-api.png
title: '<MyComponent>'
crumb: '@remotion/my-package'
---

One API per page: Each function or API should have its own dedicated documentation page. Do not combine multiple APIs (e.g., getEncodableVideoCodecs() and getEncodableAudioCodecs()) on a single page.

Public API only: Documentation is for public APIs only. Do not mention, reference, or compare against internal/private APIs or implementation details.

Use headings for all fields: When documenting API options or return values, each property should be its own heading. Use ### for top-level properties and #### for nested properties within an options object. Do not use bullet points for individual fields.

Language guidelines

• Keep it brief: Developers don't like to read. Extra words cause information loss.
• Link to terminology: Use terminology page for Remotion-specific terms.
• Avoid emotions: Remove filler like "Great! Let's move on..." - it adds no information.
• Separate into paragraphs: Break up long sections.
• Address as "you": Not "we".
• Don't blame the user: Say "The input is invalid" not "You provided wrong input".
• Don't assume it's easy: Avoid "simply" and "just" - beginners may struggle.

Code snippets

Basic syntax highlighting:

````md

const x = 1;

````

Type-safe snippets (preferred)

Use twoslash to check snippets against TypeScript:

```md ``ts twoslash import {useCurrentFrame} from 'remotion'; const frame = useCurrentFrame();

Hiding imports

Use // ---cut--- to hide setup code - only content below is displayed:

```md ``ts twoslash import {useCurrentFrame} from 'remotion'; // ---cut--- const frame = useCurrentFrame();

Adding titles

Always add a title to code fences that show example usage:

```md ``ts twoslash title="MyComponent.tsx" console.log('Hello');

Special components

Steps

- <Step>1</Step> First step
- <Step>2</Step> Second step

Experimental badge

<ExperimentalBadge>
<p>This feature is experimental.</p>
</ExperimentalBadge>

Interactive demos

<Demo type="rect"/>

Demos must be implemented in packages/docs/components/demos/index.tsx. See the docs-demo skill for details on adding new demos.

AvailableFrom

Use to indicate when a feature or parameter was added. No import needed - it's globally available.

For page-level version indicators, use an # h1 heading with <AvailableFrom> inline so it appears next to the title (not below it). Use < and > to escape angle brackets in component names:

# &lt;MyComponent&gt;<AvailableFrom v="4.0.123" />

# @remotion/my-package<AvailableFrom v="4.0.123" />

For section headings:

## Saving to another cloud<AvailableFrom v="3.2.23" />

CompatibilityTable

Use to indicate which runtimes and environments a component or API supports. No import needed. Place it in a ## Compatibility section before ## See also.

Available boolean props: chrome, firefox, safari, player, studio, clientSideRendering, serverSideRendering. Set to true (supported) or {false} (not supported).

Set to empty string "" for not applicable if this is a frontend API: nodejs="", bun="", serverlessFunctions="". Use hideServers to hide the Node.js/Bun/serverless row if this is a frontend API.

## Compatibility

<CompatibilityTable chrome firefox safari nodejs="" bun="" serverlessFunctions="" clientSideRendering={false} serverSideRendering player studio hideServers />

Optional parameters

For optional parameters in API documentation:

1. Add `?` to the heading - this indicates the parameter is optional --> Don't do it if it is a CLI flag (beginning with --) - CLI flags are always optional 2. Do NOT add `_optional_` text - the ? suffix is sufficient 3. Include default value in description - mention it naturally in the text

### onError?

Called when an error occurs. Default: errors are thrown.

Do NOT do this:

### onError?

_optional_

Called when an error occurs.

Combining optional and AvailableFrom

When a parameter is both optional and was added in a specific version:

### onError?<AvailableFrom v="4.0.50" />

Called when an error occurs.

"Optional since" pattern

If a parameter became optional in a specific version (was previously required):

### codec?

Optional since <AvailableFrom v="5.0.0" inline />. Previously required.

Generating preview cards

After adding or editing a page, generate social media preview cards:

cd packages/docs && bun render-cards.ts

Verifying docs compile

To check that documentation builds without errors:

# from the monorepo root
bun run build-docs

This validates MDX syntax, twoslash snippets, and broken links.