FreeFlatten PDF Form API
Make filled-in fields and annotations permanent, non-editable page content.
Flatten permanently merges a PDF's form fields and annotations into the page content itself, so they're no longer editable — the response reports exactly how many annotations were flattened.
How does the Flatten PDF Form API work?
One HTTP request from any language. Every ASHDOCS endpoint uses the same X-API-Key header.
curl -X POST 'https://api.ashdocs.com/api/v2/tools/pdf-flatten' \ -H 'X-API-Key: ash_live_...' \ -F 'file=@filled.pdf'
Common use cases
- →Locking a filled contract before sending for signature
- →Archiving a form so it can't be edited later
- →Normalizing a PDF before OCR or further processing
Frequently asked questions
How much does the Flatten PDF Form API tool cost?+
Nothing — this is a local page operation with no rendering engine, OCR or AI behind it, so it runs free on every plan. Sandbox keys (prefix ash_test_) also never consume credits.
What is the endpoint URL for this tool?+
The endpoint is documented in the curl example on this page. All ASHDOCS endpoints share the base URL https://www.ashdocs.com and require an X-API-Key header.
Can I run this tool inside Make, Zapier, or n8n?+
Yes — through each platform's built-in HTTP mechanism (Make's HTTP module, Webhooks by Zapier, n8n's HTTP Request node). Nothing to install: point it at this exact endpoint with your X-API-Key header. See /integrations/make, /integrations/zapier or /integrations/n8n for step-by-step setup.
Does this tool support batch or scheduled runs?+
Yes. POST /api/v1/batch runs any tool over up to 50 files with a single credit ledger entry, and pipeline schedules let you trigger the same tool on a cron. Both are documented in /docs.