PDFWren

Sign a PDF

Draw a signature, click the page where it should go, and save. Your signature and your document both stay on your device and are never uploaded.

🔒 Runs in your browser

Draw it, place it, save it

Three steps, on one screen. The page is rendered on your device so you can see exactly where the signature will land — you click the spot rather than typing coordinates and hoping.

The signature is drawn into the page content, which means it prints, it survives being copied or emailed, and it does not depend on the reader supporting annotations.

The honest part, and it matters here

This is a visible mark, not a cryptographic signature.

That distinction is easy to skip past, and it is the most consequential thing on this page. A drawn signature:

  • does put your signature on the document, which is what the overwhelming majority of forms, contracts, consent slips and internal approvals are asking for
  • does not prove who signed it — anyone with your PDF could copy the image
  • does not detect whether the document was changed after signing
  • is not a qualified or advanced electronic signature under eIDAS, ESIGN or the Indian IT Act

If someone has specifically asked for a digital or qualified signature, they mean a certificate issued to you by a trust service provider, and you need their service, not this one. No free browser tool can do that, and any that claims to is worth walking away from.

For everything else — the school form, the rental agreement, the supplier acknowledgement, the bank letter that says "sign and return" — a drawn signature is exactly what is being asked for.

Small things that were worth getting right

Transparency is preserved. The signature is embedded as a PNG with its alpha channel, so the form's signature line shows through underneath. A white box around a signature is the standard tell that it was pasted on.

The canvas is backed at device resolution. On a phone or a retina screen, a signature drawn on a 1× canvas comes out visibly soft. This one draws at the screen's real pixel density, so the stroke is crisp in the finished document.

It starts on the last page, because that is where signatures usually go.

Afterwards

If you want the signature merged in so it cannot be selected and dragged off, run the result through flatten. That is a genuine improvement in tamper-resistance and still not a guarantee — but it is honest about which one it is.

This tool runs entirely inside your browser. Your file is never uploaded — it never leaves your device, so there is nothing for us or anyone else to read, store or leak.

Common questions

Is this a legally binding signature?

It is a visible mark, which is what most forms, agreements and internal approvals actually ask for. It is not a digital signature: it does not use a certificate, does not prove who signed, and will not show whether the document was altered afterwards. If you have specifically been asked for a qualified or certificate-based digital signature, this is not that, and no free browser tool is.

Will my signature have a white box around it?

No. It is drawn on a transparent canvas and embedded as a PNG with its transparency intact, so the form line or the paper texture shows through behind it. A white rectangle sitting on a printed form is the usual giveaway that a signature was pasted on, and it is avoidable.

Is my signature uploaded or stored anywhere?

No. It never leaves the page — it exists in a canvas element in this tab, is embedded straight into your PDF, and is gone when you close the tab. Nothing is remembered between visits, which does mean you draw it fresh each time.

Can I stop someone editing the signature out?

Not really, and anyone claiming otherwise is overselling. You can make it harder by flattening the document afterwards, which merges everything into the page. A determined person with the right software can still remove it. A visible signature is a record of intent, not a lock.

Last reviewed