Sign PDF

Sign PDF Online — Add Your Signature for Free

Sign documents without printing, scanning or installing anything. Upload your PDF, add a picture of your signature (a transparent PNG works best), choose where it goes, and download a signed copy. It is the fast, paperless way to sign contracts, forms, letters and agreements.

How to Sign a PDF

1. Upload the PDF you need to sign.
2. Upload your signature image (PNG or JPG).
3. Choose the page (first, last or every page), the position and the signature width.
4. Click Sign PDF and download your signed document — it keeps the original filename.

Features

• Place it precisely: Drop your signature in any of six positions — bottom or top, left, center or right.
• Any page you need: Sign just the last page, the first page, or stamp every page at once.
• Right size, right shape: Set the width in points; the height adjusts automatically to keep your signature's proportions.
• Transparent PNGs supported: A signature on a transparent background blends cleanly onto the page.

Tips for the Best Signature

• Sign on white paper with a dark pen, photograph or scan it, then remove the background (our Image tools can help) to create a transparent PNG.
• Use an image at least 600 pixels wide so it stays crisp when placed on the page.
• Preview the placement and adjust the width if the signature looks too large or small.

Frequently Asked Questions

Is this a legally binding e-signature?

This tool stamps an image of your signature onto the PDF, which is suitable for most everyday agreements. For regulated digital signatures with cryptographic certificates, use a dedicated e-signature service.

What image formats can I use?

PNG and JPG. A transparent PNG gives the cleanest result because the page shows through around your signature.

Can I sign every page?

Yes — choose "Every page" to place your signature on all pages, or pick just the first or last page.

Are my documents safe?

Yes. Files are processed privately and deleted automatically; nothing is shared or kept.