Sign PDF
To sign a PDF, draw your signature with a mouse, finger or stylus, click where it should sit on the page, set its width and download. The document and your signature stay in your browser and are never uploaded. This is a visible drawn signature, not a certificate-based digital signature.
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How to use Sign PDF
- 1Add the PDF you need to sign.
- 2Draw your signature in the white box with a mouse, a finger or a stylus.
- 3Choose the page, then click the preview where the signature should sit.
- 4Adjust the width, press Place signature and download.
How it works
The signature is captured as a transparent PNG, so the page shows through around the strokes instead of a white rectangle sitting over the text. It is placed at a size you set as a percentage of the page width, which keeps it proportionate whatever the paper size.
Position is stored as a fraction of the page rather than in pixels, so where you click on the preview is where it lands on the full-size page. The click point is measured from the top of the preview while PDF coordinates are measured from the bottom, and that conversion is handled for you.
Everything happens in your browser: the document is never uploaded, and neither is the signature. That is the difference from most signing sites, which want your file and an account before doing the same job.
This produces a visible, drawn signature — the electronic equivalent of signing a printout. It is not a cryptographic digital signature backed by a certificate, and nothing here pretends it is.
Tips and common mistakes
- Sign on a phone or tablet screen if you can; a finger or stylus gives a more natural line than a mouse.
- Draw the signature large across the box. A big drawing scaled down looks smooth; a small one scaled up looks shaky.
- Set the width to match the space the form leaves for the signature, and click on the signature line itself rather than above it.
- Keep an unsigned copy, and send the signed file only to the people who need it.