Online demo: live · freeAPI: at launch

PDF API

Merge, split, watermark, password-protect, compress, convert and read PDFs — ten operations, one API key.

Try it live → Join early access

Capabilities

Merge, split, watermark and password-protect any PDF.
Compress files, or convert HTML/a public URL into a PDF.
Extract raw text, read metadata, or convert pages to PNG images.
Every operation on one key, same rate limits as the rest of the platform.

Where it fits

Generate and stamp downloadable reports, contracts or invoices from your app.
Shrink and merge scanned documents before archiving or sending them on.
Pull text or page previews out of user-uploaded PDFs for search or review.

What comes out

invoice.pdfapplication/pdf · 1 page · A4

IN · any PDF

Page 1 of the PDF converted to a PNG image

OUT · PNG per page

Try it live

Choose file No file chosen

Or your own PDF · max 5 MB · processed in memory, never stored · 5 runs/day per visitor

Doing this repeatedly? The same operation is one API call — at launch →

Compress

Merge

Split

Preset samples, no upload here · live call to /pdf/compress, /merge, /split · rate-limited per visitor

All 10 PDF operations

Merge — combine several PDFs into one file — /merge
Split — break a PDF into separate files — /split
Watermark — stamp text or an image over every page — /watermark
Password-protect — encrypt a PDF — /protect
Compress — shrink the file size — /compress
HTML → PDF — render your own HTML template — /from-html
URL → PDF — render any public webpage, same engine as our screenshots — /from-url
Extract text — pull the raw text out — /extract-text
Metadata — read a PDF's document properties — /metadata
To images — convert pages to PNGs (the demo below) — /to-images

Call it from your code

curl -X POST "https://api.crateapi.com/pdf/merge" \
  -H "X-API-Key: YOUR_KEY" \
  -F "files=@a.pdf" -F "files=@b.pdf" -o merged.pdf

The Document Tools key opens at launch — try every operation in the live demo above, free, right now.

Read the docs →

Trust & data handling

Every demo on this page runs against the live engine. Uploaded files and pasted text are processed in memory and never written to disk; nothing about your request is stored. Details: Trust & Security.

Pricing

This demo is free to use today. Document Tools plans open at launch — join the list and lock in the launch discount.

FAQ

Is my file stored?

No — every operation processes your file in memory and discards it. Nothing is written to disk.

What's the size limit?

The demo below caps uploads at 5 MB; the full API accepts larger files — see the docs for current limits.

Can I chain operations?

Yes — merge, then watermark, then compress, for example. Each is a separate call, so you control the pipeline.

Ready to try it?

Join early access Explore all products

Validate your e-invoice freeNo signup. Paste or upload, get the report instantly.

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