PDF Flattening turns a fillable PDF into a locked, non-editable PDF. Send the PDF file in the request body and get a binary PDF back with the form fields flattened into the document.
Use PDF Flattening when you need to preserve what a user entered before archiving, sharing, or sending the file into a workflow that should not allow further edits. It is a practical fit for signed forms, applications, intake sheets, invoices, and other documents where the filled-in content should become part of the page content.
The endpoint accepts one input: file, a PDF binary up to 20 MB. The response is the flattened PDF as a binary file, so you can store it, forward it, or attach it to another system without adding another conversion step.
If your application collects PDFs from users and needs a locked final copy, PDF Flattening gives you that output directly from the uploaded document.
Upload a PDF to flatten its fillable fields into a locked version.
curl -X POST "https://api.eu.apyhub.com/freedailypro/convert-fillable-pdf-to-locked-pdf/flatten" \
-H "apy-token: $APY_TOKEN" \
-F "file=@/path/to/document.pdf"Returns a binary file (string with format: binary), which is the flattened PDF.
Loading your default key…Flattens a fillable PDF by taking a PDF file as input and returning a binary PDF file as the result. The output is a locked/flattened PDF stream rather than a JSON object.
| Parameter | Type | Mandatory | Description |
|---|---|---|---|
| file | String | Yes | The PDF. Up to 20 MB. |
Returns a binary file response containing the flattened PDF. The output schema is a single binary string, so there are no JSON fields to document.
Max 100MB total per request (all files combined). Larger? Use this API's URL-based endpoint instead, if it has one.
bad_requestRequired parameter missing or malformed body.
unauthorizedAPI key missing, revoked, or not authorized for this service.
rate_limitedYour plan's per-second rate exceeded. Retry with exponential backoff.
upstream_busyBackend temporarily unavailable. Try again in a few seconds.
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