> ## Documentation Index
> Fetch the complete documentation index at: https://docs.extend.ai/llms.txt
> Use this file to discover all available pages before exploring further.
>
> ## API version
> The current API version is `2026-02-09`, served at the site root (no version prefix in URLs).
> If this page URL contains `/2025-04-21/` or `/2024-12-23/`, you are reading an older API version.
> Prefer the current docs at https://docs.extend.ai/llms.txt unless the user explicitly needs that older version.
> Do not treat older-version pages as the source of truth for new integrations.

# General

> Ship your document processing with Extend. Get started with our APIs, SDKs, and guides.

## Docs

- [Composer Chat](https://docs.extend.ai/general/composer-chat.md): Use Composer chat to edit extractors and workflows, inspect supporting data, and continue work across saved conversations.
- [Supported File Types](https://docs.extend.ai/general/supported-file-types.md): File types Extend supports for parsing, extraction, classification, and splitting — including PDF, images, and Office documents — with size and page limits.
- [How Credits Work](https://docs.extend.ai/general/how-credits-work.md): How Extend's credit-based billing works: what parse, extract, classify, split, and edit runs cost, how Performance vs Light modes change price, and plan rates.
- [Rate Limits](https://docs.extend.ai/general/rate-limits.md): Extend API rate limits by plan tier — per-endpoint request limits, processor throughput, workspace-level overrides, and how to handle 429 responses.
- [Async Processing](https://docs.extend.ai/general/async-processing.md): Understand sync vs. async processing in Extend, and how to use SDK polling helpers and webhooks for production workloads.
- [Batch Processing](https://docs.extend.ai/general/batch-processing.md): Process hundreds or thousands of files asynchronously using the batch endpoints for parsing, extraction, classification, and splitting.
- [User Roles and Permissions](https://docs.extend.ai/general/user-roles-and-permissions.md): Learn about the different user roles in Extend and what each role can access
- [Test Environment Guide](https://docs.extend.ai/general/test-environment-guide.md): Use a test-mode API key to run extractions, classifications, and workflows against an isolated test environment with no production data or webhooks. Covers how test keys route requests, what is isolated vs shared, and how to configure each SDK (Python, TypeScript, Java, Go) for test mode.