pdfkoala

Sign PDF

Upload your PDF and a photo of your signature (JPG or PNG) — we stamp it where you choose. This is a visual signature, not a cryptographic one.

Max 30 MB per file. Files are deleted after 2 hours.

How to sign a PDF

  1. 1

    Select two files

    Add the PDF to sign and an image of your signature (JPG or PNG).

  2. 2

    Position your signature

    Choose the page, the position on it and the signature size, then press Sign PDF.

  3. 3

    Download

    Download your signed PDF. Your files are deleted automatically after 2 hours.

Frequently asked questions

Can I sign a PDF online for free?

Yes — stamping your signature onto a PDF is free, with no account needed and no watermark on the signed document.

Is my signature image stored anywhere?

Only during processing. The PDF and your signature image are deleted from our servers automatically within 2 hours and are never shared or reused.

What files do I need to sign a PDF?

Two files: the PDF to sign and a JPG or PNG image of your signature. You choose the page, position and size — note this adds a visual signature, not a cryptographic one.