Convert.FAST API

Convert.FAST API — a REST API for file conversion across 200+ formats. Images, RAW photos, documents, audio, video, archives, fonts, and ebooks.

How it works:

1. POST /convert — upload a file + target format
2. GET /convert/job/{id} — poll for completion
3. GET /convert/job/{id}/download — grab the result

Why developers use it:

• 200+ converters — images, RAW photos, documents, audio, video, archives, fonts, ebooks
• Up to 1 GB per file — high-performance own stack on dedicated EU servers
• Published performance metrics — P50 (median) conversion time from the last 10,000 jobs shown on every converter
• Webhook notifications — HMAC-signed callbacks when jobs complete
• AI agent friendly — prompt-based onboarding docs, a SKILL.md file agents can ingest directly, plus convert.fast.sh and convert.fast.ps1 convenience scripts that handle the submit/poll/download loop in one call
• Auto-generated docs — built from the OpenAPI spec so always up to date, every converter has its own page with examples and a try-in-browser link. One-click "copy all docs as markdown" button to paste straight into your AI agent
• Discovery endpoint — query supported conversions, limits, and options programmatically
• Same API key & account — also unlocks best-in-class image, document, and PDF compression at /compress

Free to start: Sign up free → 500 Pro credits instantly (~2.5 GB of conversions or 500 files). API key in 2 minutes, first conversion in 5. No credit card. Pay-as-you-go top-ups when you need more.