Lock a PDF form

Takes a filled-in PDF form and freezes it: what is written stays visible, but the fields disappear and nobody can change them. It is what you want before sending a form to someone. The file never leaves your device.

Your file stays on your device: nothing is uploaded

How it works

The field values are drawn onto the page — in the right place, looking the same as before — and then the form is removed from the document. At the end the file just produced is reopened to check that no fields are left: if any were, we tell you instead of handing you a form you believe is locked. Careful: this cannot be undone. A locked form can no longer be filled in, so if you still need it editable, keep the original. And if the PDF has no real fields — many boxes are just lines drawn on the page — we say so, instead of giving you back an identical copy. One limit worth knowing: forms with a digital signature already applied, or built with Adobe’s XFA technology, may contain fields we cannot freeze; if so, the count of locked fields we report is the measure of what actually happened.

Your files are never uploaded. Anywhere.

Not to a server of ours, not to a third party, never. When you pick a file it stays in your browser’s memory: it is read, processed and written back on your device, and you save the result yourself. There is no path that takes it elsewhere, because there is no server to send it to.

Processed locallyFormats are handled by WebAssembly code running in your browser, not by a remote service.
Nothing to upload, nothing to wait forOther services send your file to a server and then send it back to you. Here the file never leaves: there is no upload to wait for.
No accountNo sign-up, no email, no daily limits to get around by paying.
No files to deleteOthers promise to erase your files after an hour. We have nothing to erase: they never reached us.

Other tools in this category

Compress PDFLightens scans while keeping the text searchable.Protect PDFAdd a password, or remove it if you know it.Merge PDFsSeveral PDFs into one document, in the order you choose.PDF to imagesEvery page becomes a JPG or PNG, at the resolution you choose.Split PDFOne page per file, by ranges, or in blocks.Organise PDF pagesRotate, delete and reorder pages on a grid.Redact PDFGenuinely hides part of a PDF: the page is redrawn, and no text is left underneath the black.Fill in a PDF formFills a PDF form’s fields and tells you what it wrote, what was locked and what was not.Crop PDFRemoves the white margins, by itself or with the measurements you choose.Sign a PDF by handDraw your signature and place it on the document. This is not a digital signature.Pages per sheetPuts 2, 4, 6 or 9 pages on a single sheet, or lays them out as a booklet.Images to PDFSeveral photos or scans in one PDF, one per page.Watermark PDFOverlay a word like “DRAFT” or “CONFIDENTIAL” on every page.Page numbers on PDFNumber the pages of a PDF, choosing position, format and where to start.Remove PDF metadataAuthor, dates, originating software and the XMP block.