PDF API for developers
The same engine powering imisspdf.com, available as REST API. 250 files/month free. Pay-per-use after. No infrastructure to manage.
# Merge three PDFs into one — no infrastructure needed curl -X POST https://api.imisspdf.com/v1/merge \ -H "Authorization: Bearer $YOUR_API_KEY" \ -F "[email protected]" \ -F "[email protected]" \ -F "[email protected]"
One API, every PDF operation
REST API for every tool
All 38 web tools available as endpoints. Plus 2,500+ low-level operations for fine-grained control.
Async processing
Long jobs return a job ID and POST to your webhook when complete. Built for batch reports and mass conversions.
Batch operations
Process thousands of files in parallel. Concurrency, retries, and partial-success handling built in.
Pay only for what you use
Free
250 files/mo. Community support.
- 250 files / month
- All 38 endpoints
- 10 req/min rate limit
Pro
AI tools $0.05/file.
- Pay only for usage
- 60 req/min rate limit
- Webhooks & async
- 99.95% SLA
Enterprise
Volume + dedicated support.
- From $0.003/file at volume
- 99.99% SLA
- Dedicated capacity
- On-premise option
What teams build with imisspdf API
Document automation
Auto-generate, fill, sign, and route contracts. A legal-tech customer processes 250K NDAs/month.
SaaS integration
Embed PDF generation into your product without owning infra. White-label available.
Internal tools
Expense-report processors, OCR pipelines, contract diffs. Three lines of code beats six weeks of engineering.
From signup to first request in 4 minutes
Sign up
Free tier — no card required. Generate a key from the dashboard.
Install SDK
Official Node, Python, Go, PHP. Or any HTTP client — REST is REST.
First request
cURL, Postman, or 4 lines of code. Results in under a minute.
Set up webhook
Async jobs POST to your URL. Signed for security.
Developer questions
By file processed. A batch of 100 files = 100 calls. AI tools cost 5x. Webhook POSTs and status checks are free.
Default: requests start to 429. Or opt into pay-as-you-go overflow at the same per-file rate.
Yes — Enterprise customers can deploy as a Helm chart. Includes air-gapped option.
Official: Node.js, Python, Go, PHP. Community: Ruby, Java, Rust, .NET.
Same as the web: deleted 1 hour after the result is downloaded, or 24 hours max.
Pro: 99.95% with credits. Enterprise: 99.99% with financial guarantees. Status at status.imisspdf.com.
Start building with PDF API today
250 files free, every month. No card to start.