Conversion API for AI builders.
688 formats. Flat pricing.
One API. Every format. No per-format fees, no per-page parsing tax, no surprise overages. Free up to 1,000 conversions a month, paid plans from $29/mo.
- 1,000 conversions/month
- 25 MB max file size
- 10 req/min rate limit
- Hard-stops at quota
- Email support
- 10,000 conversions/month
- 100 MB max file size
- 60 req/min rate limit
- $0.005/conversion overage
- Email support
- 50,000 conversions/month
- 500 MB max file size
- 120 req/min rate limit
- $0.005/conversion overage
- Priority email support (1 business day)
- 500,000 conversions/month
- 2 GB max file size
- 600 req/min rate limit
- $0.005/conversion overage
- Private Slack channel
- 5,000,000 conversions/month
- 5 GB max file size
- 3,000 req/min rate limit
- $0.005/conversion overage
- Named contact, weekly check-ins
Self-hosted deployments, custom format engines, dedicated infrastructure, and a written 99.95% monthly uptime SLA. Built for regulated industries and high-volume platforms with strict residency or compliance requirements.
Why ChangeThisFile API
Built for builders who need conversion to be a one-line dependency, not a project.
Image, video, audio, document, spreadsheet, ebook, archive, font. Pass source and target as extension strings — we handle the engine routing (FFmpeg, LibreOffice, Calibre, Sharp, 7-Zip) for you.
Every format costs the same. PDF-to-DOCX, PSD-to-WebP, MKV-to-MP4 — one conversion equals one count against your monthly quota. No per-page tax, no per-format multiplier.
Files are deleted from our servers immediately after conversion. We never train models on your data and we never share files with third parties. Audit logs available on Scale and above.
Image, data, and spreadsheet conversions complete in under 500 ms at the median. Long-running formats (large video, ebook bundles) move to the async /v1/jobs endpoint automatically.
Frequently asked questions
Still have a question? Email support@changethisfile.com.
Can I change plans?
Yes. Upgrade or downgrade any time from the dashboard. Changes take effect immediately and we prorate the difference on your next invoice. Annual plans are non-refundable but can be paused or migrated to a different plan at renewal.
What happens if I exceed my quota?
Paid plans bill overage at $0.005 per conversion above your monthly quota — that overage shows up on your next invoice. The free plan hard-stops at 1,000 conversions and returns HTTP 429 until the next billing cycle resets it. You can set a soft alert at 80% of quota from the dashboard.
Is there a free tier?
Yes. The free tier includes 1,000 conversions per month, a 25 MB file size cap, and 10 requests per minute. No credit card required. Hit POST /v1/keys/free with an email and you get a key back immediately.
How do I get an API key?
Two ways. Programmatically: curl -X POST https://changethisfile.com/v1/keys/free -H "content-type: application/json" -d '{"email":"you@example.com"}'. Through the UI: visit the dashboard, sign in with magic link, generate a key.
What is the SLA?
Self-serve plans run on the same infrastructure as our public converter, which has sustained 99.9% uptime over the trailing 12 months. There is no written SLA on self-serve. Enterprise contracts include a written 99.95% monthly uptime SLA with service credits if we miss it.
Do you train on my files?
No. Files are deleted from our servers immediately after the conversion completes. We never train models on customer data, we never share files with third parties, and we never read the contents of your files outside the conversion path itself. Privacy details are on the privacy page.
Can I self-host?
Self-hosting is available on the Enterprise plan. We ship a Docker compose stack with all conversion engines (FFmpeg, LibreOffice, Calibre, Sharp, 7-Zip) and you run it inside your VPC. Email aadil@changethisfile.com to scope a deployment.
Does the API support async / large files?
Yes. POST /v1/convert processes files under 100 MB inline and automatically queues larger files to async — you get back HTTP 202 with a job_id to poll. POST /v1/jobs always queues regardless of size, for callers that prefer predictable async behaviour. Full schema is in the OpenAPI spec.
How do I get support?
Free and Hobby tiers get email support at support@changethisfile.com — typical response time is 24–48 hours. Startup and above get priority response within one business day. Scale and Growth get a private Slack channel and a named contact who knows your stack.
Can I pay annually for a discount?
Yes. Annual plans are billed once a year at a 20% discount versus the monthly rate. Toggle the billing interval at the top of this page to see annual pricing. You can switch from monthly to annual at any time from the dashboard.
Get a free API key in 30 seconds
No credit card. 1,000 conversions a month, every month, for free. Upgrade only when you outgrow it.