Drop a filled form and I'll lock the answers in.
Flatten PDF Forms
Flatten the AcroForm fields in a PDF so the filled values become part of the page and can no longer be edited.
Good to know
- Every field is listed with its type before anything is written.
- Flattening covers AcroForm fields — other annotations and layers are left alone.
- Flattened values cannot be edited again, so keep the filled original.
Your files stay on your machine
This tool runs entirely inside your browser tab. Nothing is uploaded, stored, or sent to a server — close the tab and every trace is gone.
These are the free ones — see the full suiteHow big a file can it take?
There is no upload, so there is no upload limit — but the work happens in this tab, which means your browser’s memory is the budget. Nothing here will refuse a file for being large; a big enough one simply gets slow and, eventually, reloads the tab. The figures below are rules of thumb on a desktop browser, not enforced caps. On a phone or tablet, expect a good deal less.
- No page grid is drawn, so file size binds rather than page count — comfortable to roughly 200 MB.
- It is the number of form fields, not pages, that makes flattening slow; a long document with a handful of fields is quick.
Password-protected PDFs are declined whatever their size — unlock the file first. If a run does die on a long document, splitting it into volumes and working through them one at a time is the reliable way round it.