For AI agents: a documentation index is available at the root level at /llms.txt and /llms-full.txt. Append /llms.txt to any URL for a page-level index, or .md for the markdown version of any page.
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DocumentationAPI ReferenceModel VersioningChangelog
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Getting Started

Overview

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API Quickstart

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Built with

Extend is a platform for building, iterating on, evaluating, and deploying AI-powered document processing infrastructure. We provide parsing, extraction, classification, splitting, and editing so you can focus on building the features that matter for your business. Extend uses a mix of trained-in-house and frontier models to balance accuracy, latency, and cost for your use case.

What do you need to do?

You need to…Start here
Turn documents into clean markdown or blocks for RAG and agentsParsing
Pull specific fields into structured JSON (invoices, IDs, contracts)Extraction
Route incoming documents to the right downstream processClassification
Split a multi-document PDF into separate files by typeSplitting
Fill forms or generate completed PDFs programmaticallyEditing
Build multi-step document pipelines with chained classification, splitting, and extractionWorkflows

Start building

We have quickstarts for a few different integration paths. Pick the on-ramp that fits how you work:

API & SDKs

Integrate directly into your app using our API. Call Extend from SDKS in Python, TypeScript, Java, and Go or REST.

Dashboard

Build, test, and iterate in the browser – then copy the API call straight into your code.

AI Agents

Point a coding agent at Extend with ready-made context files and a machine-readable docs index.