§ Mark and adjust

Set PDF Metadata API

Writes document properties and keywords, and removes them. Removals are applied before additions, so you can replace a value in one request.

Get an API key Read the docs

Endpoint: POST /pdf/set-metadata
Inputs: Exactly 1 PDF
Returns: application/pdf
Limits: 20 MB per file, 3,000 pages.
Price: $0.001

§ 01 The request

One POST, and the file comes back.

POST /pdf/set-metadata

curl -sS --fail-with-body \
  -o tagged.pdf \
  -H "Authorization: Bearer $OHMYWRAP_KEY" \
  -F "file=@contract.pdf" \
  -F 'options={"properties":{"Department":"Legal"},"keywords":["contract","2026"]}' \
  https://api.ohmywrap.com/pdf/set-metadata

Options

Options accepted inside the options JSON object
Option	Type	Default	What it does
properties	object	—	Property name to value, to set.
keywords	string[]	—	Keywords to add.
removeProperties	string[]	—	Property names to delete.
removeKeywords	string[]	—	Keywords to delete.

Worth knowing

At least one of the four options must be present, or it is 422 no_metadata_change rather than a pointless round trip that changes nothing.

§ 03 Nearby

Other pdf endpoints

All pdf endpoints

Your first /pdf/set-metadata call takes one line of curl.

Ten thousand calls cost ten dollars, the pack never expires, and nothing you send is kept.

Get an API key Read the docs

10,000 calls for $10. No subscription, no expiry.