Lock a filled PDF form permanently — freeze every field, checkbox and annotation into the page in seconds. Nothing is uploaded: your document is flattened 100% inside your browser.
Forms, applications, filled contracts — one PDF at a time
This PDF has 0 pages and 0 interactive form fields.
A PDF that contains a form is really two things in one: the printed page you see, plus an invisible layer of interactive fields floating on top of it. The fields hold your typed answers, the checked boxes, the comments — everything anyone could still click, change or delete. Most viewers hide this structure, but it is there, and anyone with a PDF editor can edit your answers and send the form on.
Flattening presses that floating layer down into the page itself. Your filled answers stop being fields and become printed text, like ink on paper. The document looks identical — same layout, same fonts, same signatures — but there is nothing left to click or edit. The result is a fixed, tamper-resistant document that renders the same way in every viewer, printer and filing portal.
Two common confusions, cleared up honestly:
Most people discover flattening only after a frustrating rejection email. Here are the situations where it is the right fix:
And the situations where you should not flatten: when you might still need to change an answer (flattening is one-way), when the PDF is only scanned images with no fields (there is nothing to lock — the tool will tell you), or when the form still needs to be filled in by someone else.
Smallpdf, iLovePDF and Sejda all upload your document to their servers for processing. This tool flattens entirely inside your browser — your filled form never travels anywhere. The strongest privacy guarantee is architecture, not a promise.
The "Print to PDF" trick destroys text selectability and strips hyperlinks and bookmarks. This tool bakes field values into the existing text layer, so your flattened PDF keeps working like a real document.
Server-based tools ration you with daily limits and "free document" counters. There is no server here, so there is nothing to count: flatten as many forms as you need.
Once the page loads, you can disconnect from the internet and the tool still flattens. Filled forms from a café, a train or a government office queue — no connection required.
Flattening bakes a PDF's interactive layers — form fields, checkboxes, annotations — into the page itself. Filled answers become ordinary printed text that can no longer be edited, while the document stays fully searchable and looks exactly the same.
Yes — completely free, with no sign-up, no document quotas, no watermarks and no premium tier. Flatten as many PDFs as you need.
No. Unlike Smallpdf, iLovePDF or Sejda, your file never leaves your device. Flattening happens in JavaScript running locally in your browser, so sensitive forms stay private by design.
No. Flattening is one-way: once fields are baked into the page, there is no "unflatten". Keep a copy of the original editable form before you flatten, in case you need to change an answer later.
Yes. This tool bakes field answers into the existing text layer, so the flattened PDF keeps selectable, searchable text — unlike the "Print to PDF" trick, which often destroys text selectability and removes hyperlinks.
No. Flattening stops fields from being edited, but anyone can still open and read the file. For sensitive documents, flatten first to lock the answers, then add a password to the flattened copy.
Then flattening has nothing to do — and this tool checks on load and tells you exactly how many interactive fields it found. Scanned documents and plain exported PDFs rarely contain fields.
Casually, no: fields cannot be clicked and edited, and answers cannot be quietly changed and passed on. Technically, anyone with a full PDF editor can still alter page content, so for legally sensitive filings confirm requirements with the receiving institution.
Remove the password from a protected PDF — decrypted in your browser, never uploaded.
Open tool →