Sign PDF
Draw, type or upload a signature and place it on the page.
About Sign PDF
Add a signature to a PDF without printing it. Draw one with a mouse, trackpad or finger, type one, or bring an image of your own, then place it on any page and download the signed file. The document never leaves your device — which is the whole point when the thing being signed is a contract.
Signing a document still usually means printing it, signing it, scanning it and hoping the scan is legible — a round trip through two machines to add one mark to one page.
Draw the signature with a trackpad or a finger, type it, or use an image you already have, put it where it belongs, and download the signed file. The contract stays on your machine throughout, which matters rather more for a contract than for a holiday photograph.
- Processed on your deviceEverything you open or type here is handled by this page and never uploaded anywhere.
- No queue, no limitsNothing waits on a server, so the only limit is your own hardware.
- No account neededNo sign-up and no email address required.
How Sign PDF works in your browser
A drawn signature is captured on a canvas at your display’s real pixel density, then cropped to its own ink before it is used — otherwise the blank space around the mark travels with it and the box on screen would sit nowhere near the visible signature. The trimmed mark is embedded as a transparent PNG and stamped onto the page with pdf-lib.
Placement is worked out in the page as you see it and converted back into PDF coordinates on the way out. Those are not the same thing: PDF measures from the bottom-left corner upwards, and a page can additionally carry a rotation entry that turns it a quarter or a half turn when it is displayed. Each of those cases is handled explicitly, and the signature is counter-rotated to stand upright, so a sideways scanned page is signed the way it looks rather than the way it is stored.
What this produces is an image of a signature on a page. That is what most agreements mean by a signed PDF and what most counterparties accept. It is not a cryptographic digital signature: there is no certificate, so the file does not carry proof of who applied the mark and will not report later modification. Where that matters — a deed, certain regulated filings — a qualified trust-service provider is the right tool and this is not.
When to use it
Returning a signed rental agreement, NDA or employment contract without owning a printer. Signing a document containing salary or bank details, where an upload to a converter site is precisely the wrong move. Initialling one page of an agreement; for several pages, sign one, then load the signed file again for the next. Putting a countersignature on a form that arrived already signed by the other side.
Frequently asked questions
Is this a legally binding electronic signature?
It is an image of a signature placed on a page, which is what most people mean by signing a PDF and what most everyday agreements accept. It is not a cryptographic digital signature backed by a certificate, so it does not prove who applied it or detect later changes. Where that matters — deeds, some regulated filings — use a qualified provider.
Where does my signature go?
Onto the page, and nowhere else. It is drawn in this tab, stamped into the PDF in this tab, and discarded when you close it. The signature is never stored or sent; only the PDF's name is added to the recent-files list in your own browser.
Can I add the date as well?
Yes. A dated line can be placed under the signature, and you can set the date rather than being given today's automatically.