How to flatten a PDF after signing
A signature added by most PDF viewers is an annotation: an object sitting above the page rather than printed on it. It looks identical, and it can be selected, dragged onto a different paragraph, or deleted entirely by whoever opens the file next. Flattening merges those objects into the page itself, so what the recipient sees is what everybody will keep seeing.
Drop your document here and sign it now. PDF, Word and Excel all work: a .docx or .xlsx is laid out in your browser exactly as it was written, so there is nothing to convert first. Add a signature, a date, a company stamp or a watermark, then download it sealed. Free to start, no account, and the file is never uploaded to open it.
How to flatten a PDF after signing, step by step
- Drop the signed or unsigned PDF in, If it still needs signing, sign it here and flattening happens as part of sealing it. If it is already signed elsewhere, drop it in and seal it as it is.
- Fill any form fields that are still empty, Interactive fields are flattened too, so a form that renders differently in every viewer stops doing that.
- Seal the document, Signature, stamps, watermark and field values all become part of the page, and a SHA-256 fingerprint is taken of the result.
- Download it, What comes out is a flat PDF with nothing draggable on it, plus a verification link that shows whether the file has changed since.
What you get
- The signature cannot be selected, moved onto other text, or deleted.
- Form fields stop rendering differently in different PDF readers.
- Fonts and appearances are fixed, so a phone shows what a desktop showed.
- A tamper-evident fingerprint, so a later edit is detectable rather than deniable.
- Smaller files, because the interactive layer goes with the flattening.
Frequently asked questions
Why does my signature move in a PDF?
Because it is an annotation rather than page content. Annotations have their own coordinates and can be dragged, and some viewers reposition them when the page is rotated or the file is re-saved. Flattening removes the distinction by printing the signature into the page.
How do I draw a signature on a PDF?
Drop the PDF in, choose to draw, and sign with a mouse, a trackpad, a finger or a stylus. Zoom in first: a signature drawn at a small size is a scribble, and drawing large then placing it smaller looks like the real thing.
Does flattening remove the ability to verify a signature?
It removes the interactive layer, not the evidence. The audit certificate, the signer record and the SHA-256 fingerprint sit outside the page content, and the public verification page checks the file you hold against the file that was signed.
Can I flatten a PDF someone else signed?
Yes, and it is worth doing before filing it. What you cannot do is change what it says: the fingerprint is taken at seal time, so any later edit shows up as a mismatch.
Is flattening the same as locking a PDF?
No. A password stops people opening or editing a file and can be removed. Flattening changes what the file is made of, so there is nothing left to edit in the first place.
What PDF Verified is, and what it is not
PDF Verified is a tool for preparing, signing, stamping and checking documents. It is not a law firm, a compliance service or a forensic examiner, and nothing here is legal, financial or compliance advice. Requirements differ by country, by document type and by the party asking, so check what applies to your document before you rely on it, and take advice where the document matters. You are responsible for the documents you create, sign and send, and for having the authority to do so: signing or stamping in somebody else name, or as an organisation you do not represent, is forgery whatever tool is used. To the extent the law allows, we accept no liability for how a document made with this tool is used or relied on. The full position is in our terms of service.