How to Sign a PDF Online for Free — and What Actually Makes It Legal
Add a drawn signature to a PDF for free in your browser, plus an honest look at what makes an electronic signature legally valid — and what it doesn't guarantee.
You can add your signature to a PDF in under a minute for free — but "I signed it" and "it's legally binding" aren't automatically the same thing. This guide covers both: how to actually sign, and what makes a signature hold up.
Draw and place your signature
Sign PDF lets you draw a signature directly with your mouse or finger, position it anywhere on the page, and resize it. The signature is drawn into the saved PDF, the same way a watermark is — it becomes part of the document, not a separate overlay.
What actually makes an e-signature legal
In most jurisdictions (the U.S. ESIGN Act, the EU's eIDAS regulation, and similar laws elsewhere), an electronic signature is legally valid mainly because of INTENT and CONSENT — both parties agreed the action counts as a signature — not because of a specific tool or a fancy cryptographic certificate. A drawn signature, a typed name, or even clicking "I agree" can all count.
Where a simple drawn signature isn't enough
Some document types (wills, certain real estate transfers, some court filings) have stricter rules by law and may require a notarized or "qualified" electronic signature with identity verification — a simple drawn signature won't satisfy those. When in doubt for a high-stakes document, check the specific legal requirement rather than assuming any e-signature works.
What this tool does — and doesn't — provide
This tool draws your signature into the file, entirely in your browser, with nothing uploaded. It does not provide identity verification, a tamper-evident audit trail, or a certified digital signature (the cryptographic kind with a certificate authority) — for routine documents that's rarely needed, but it's honest to know the difference before relying on it for something that matters legally.
Signing on a phone versus a computer
A mouse draws a shaky signature; a finger on a phone or a stylus on a tablet usually does better, because it mimics holding a pen. Whichever device you use, draw slowly and larger than you need — you can shrink the placed signature on the page, and a signature drawn big and scaled down looks smoother than one drawn tiny. If the first attempt looks nothing like yours, clear it and redraw; nothing is saved into the document until you place and download it.
Multiple signature spots, initials and dates
Contracts often ask for more than one mark: a signature on the last page, initials on earlier pages, sometimes a printed name and date beside the signature. Work through the document page by page and place each mark where its box or line expects it — a signature floating in the wrong place invites questions. If a form reserves a dedicated signature field, your drawn signature belongs inside that field, not next to it.
After you sign: sending and storing the signed file
The signed download is the record — send that file, not the unsigned original, and keep your own copy unchanged. Any edit made after signing produces a different document from the one you signed, so if the content needs a fix, go back to the unsigned file, fix it, and sign again. Storing the signed copy with the date in its filename (contract-signed-2026-10-20.pdf) makes it trivially findable when a question comes up months later.
Quick tips
- Draw your signature once, download it, and keep it as an image if you'll need to sign documents often — you can reuse it by placing it as an image on future PDFs.
- For contracts where the other party might dispute the signature later, keep your own dated copy of the signed file.
- For high-stakes legal documents, check with a lawyer or the receiving institution about their specific signature requirements before assuming a drawn e-signature is sufficient.
- Sign only the final version — edits after signing create a different document, so fix first, sign last.
- Draw your signature large and shrink it into place; it looks smoother than drawing it small.