Convert.FAST API
Convert everything. Maintain nothing.
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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:
POST /convert— upload a file + target formatGET /convert/job/{id}— poll for completionGET /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.mdfile agents can ingest directly, plusconvert.fast.shandconvert.fast.ps1convenience 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.
Convert.FAST API is a REST API that converts files between 200+ formats with a single HTTP request.
- for
- Developers building server-side integrations or AI agents that need automated file conversion.
- pricing
- freemium
Key features
- Wide format support — Convert between images, RAW photos, documents, audio, video, archives, fonts and ebooks.
- Async submit-poll-download flow — Three-step process (POST /convert, GET job status, GET download) for reliable conversions.
- CLI wrappers — Shell scripts (convert.fast.sh / .ps1) handle the full flow in one command.
- Webhook notifications — HMAC-signed callbacks alert when jobs complete, avoiding polling.
- AI-agent friendly docs — Auto-generated OpenAPI docs, SKILL.md and convenience scripts for LLM agents.
- High limits — Up to 1 GB per file, 6 parallel jobs (Pro) and 18 queued jobs per account.
Use cases
- Batch image resizing and format conversion in a CI pipeline.
- On-the-fly document PDF generation from user uploads.
- Audio/video transcoding for media processing services.
- LLM agents that need to fetch, convert and return files automatically.
Convert.FAST API pricing
- Free$050 MB per file · 3 parallel jobs · 50 daily credits · Standard priority
- Pro (monthly)$12/month/month2 GB per file · 6 parallel jobs · 1000 files per batch · Priority processing
- Pro (annual)$9/month/monthBilled $108/year · Same Pro limits · 25% savings · Team seats
- Pay-as-you-goFrom $5Credits never expire · Buy credit packs (5-20-15 000) · No subscription required · Credits roll over up to monthly limit
Convert.FAST API vs alternatives
 Convert.FAST API |  n8n |  LangChain |  Claude Code |  OpenAI Codex | |
|---|---|---|---|---|---|
| Best for | 200+ format file conversion API | Automating multi-step workflows | Building LLM-driven applications | AI-assisted coding | AI code completion |
| Pricing | Freemium | Subscription | Free | Subscription | Subscription |
| DevHunt upvotes | 1 | 0 | 0 | 0 | 0 |
| Launched | Mar 2026 | — | — | — | — |
- Convert.FAST API vs n8n: Workflow automation platform; not a dedicated file-conversion API
- Convert.FAST API vs LangChain: LLM app framework; provides no built-in converters
- Convert.FAST API vs Claude Code: Agentic coding tool focused on code generation, not file conversion
- Convert.FAST API vs OpenAI Codex: OpenAI Codex offers code generation, not bulk format conversion
Convert.FAST API FAQ
How do I get started without a credit card?+
Sign up for a free account, receive 500 Pro credits instantly, and you get an API key within minutes.
What is the maximum file size I can convert?+
Free tier allows up to 50 MB per file; Pro tier raises the limit to 2 GB per file.
How are conversion jobs limited?+
Free accounts can run 3 parallel jobs (up to 18 queued); Pro accounts get 6 parallel jobs.
Can I receive conversion results via webhook?+
Yes, provide a webhookUrl and webhookSecret when submitting; you’ll get an HMAC-signed POST when the job finishes.
Do converted files stay available indefinitely?+
Output files are kept for 1 hour after completion, then automatically deleted.
Summarized by DevHunt from convert.fast · Oct 4, 2026. Details may change; check the official site.
