Your PDF never leaves your device
Your real signature, on any PDF.
Sign on paper and take a photo. SignFlow lifts the ink off the page, hands you a clean transparent signature, and lets you place it exactly where it belongs.
- No account
- Nothing stored
- Works on your phone
How it works
From pen and paper to a signed PDF in three steps.
- 01
Photograph
Sign a white sheet with any blue or black pen. Open the camera from the page and fit the signature inside the frame.
- 02
Review
The paper, the shadows and the stray marks are removed. You check the result on white, dark and transparent backgrounds, and correct it if needed.
- 03
Place and download
Scroll to the right page, drag the signature into position, resize or rotate it, and download the signed PDF.
Why SignFlow
Built around the way people really sign.
Ink, not a cut-out
Opacity follows how much ink each point of the stroke holds, so thin lines, pressure changes and tapered ends survive. The pen's own colour is recovered, even from a pale photo. Nothing is redrawn or invented.
Signed in your browser
The PDF is opened, displayed and signed on your device. It is never uploaded.
Exact placement
What you see is what is written to the file, down to a fraction of a millimetre, on rotated and cropped pages too.
Three ways to sign
Photograph your handwritten signature, draw it on screen, or type your name in a handwriting style.
It says no to a bad photo
A blurry, dark or cut-off photo is refused with the reason and a way to fix it, instead of producing a signature you would not want on a contract. Every extraction is shown to you before it is used.
Privacy
You always know where your files are.
Documents and signatures are sensitive, so SignFlow keeps as little as possible, for as short a time as possible.
- Your PDF
- Stays in your browser from start to finish. It is never sent to a server.
- Your signature photo
- Sent to the SignFlow server only to remove the paper. Processed in memory, never written to disk, never logged.
- Afterwards
- Nothing is kept. No account, no cookies, no saved signatures.