Free · No sign-up · Runs in your browser
Sign a PDF free online
Draw, type or upload your signature, add your initials and the date, and fill in form boxes — then download the signed PDF. It never leaves your device.
Not uploaded — nobody sees it Draw, type or upload Fills in PDF forms No watermark, no account
Your PDF and your signature are never uploaded — everything happens right here in this browser tab, on your device. We never see them, copy them or keep them.
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Add items with the buttons, then drag them into place. Drag the blue dot to resize. Ctrl+Z undoes. Mark Colour Size Arrow keys nudge it (Shift for bigger steps)
At a glance
Sign PDF: quick facts
Sign a PDF and fill in its form, without printing or uploading it.
Updated
- Price
- Free, no sign-up, no account for anyone signing.
- Signature
- Draw, type or upload it; add initials, the date, text and ticks.
- Forms
- Fill in boxes and tick boxes; places marked "Sign here" are highlighted.
- UK law
- Electronic signatures are valid for most everyday documents (not wills and some deeds).
- Works on
- Computers and phones, in the browser.
- Privacy
- Your file is processed in your browser and never uploaded.
How it works
How to sign a PDF
Add your PDF, place your signature, initials, the date, text or ticks wherever they’re needed, and fill in any form boxes. Download the signed copy when everything is in place.
- 01
Choose your PDF
Pick the document you need to sign. It opens here in your browser.
- 02
Add your signature
Draw it, type it or upload a photo of it. Add initials, the date or text, and fill in any form boxes.
- 03
Download it
Drag everything into place and download the signed PDF.
Electronic signatures are accepted for most everyday documents in the UK. A few, such as wills and some deeds, need a handwritten signature and witnesses. This tool adds an electronic signature, not a certificate-based digital signature. General information, not legal advice.
Tips
Tips for signing documents
A few habits make a signed document look right and save it coming back to you.
- Upload your real signatureFor the closest match to your handwritten signature, sign a sheet of white paper in black pen, photograph it in good light and upload the photo. A clean, high-contrast picture gives the neatest result.
- Check every page before savingScroll through the whole document before you download. It’s easy to miss an initials box on page 7, and a missed box usually means the form comes back to you.
- Write dates that can’t be misreadChoose a format such as 27 September 2026 rather than 09/10/2026, especially when signing something from another country, where the day and month may be the other way round.
- Keep what you signedSave the signed PDF somewhere you can find it, along with the email or message it came with. If there’s ever a question about what you agreed, you’ll have both.
Like every Altto tool, this runs on your device — nothing you add is uploaded. How Altto works
5 types
of item can go on the page: signature, initials, date, text and tick, each one movable and resizable.
FAQ
Frequently asked questions
How do I sign a PDF without printing it?
Open the PDF here, draw, type or upload your signature, drag it onto the signature line, then download the signed copy. There is no printing or scanning, no account, and the file stays on your own device. Add the date or initials the same way, and fill in any form fields before you save.
Is my PDF uploaded when I sign it?
No. The PDF is opened, signed and saved inside this browser tab on your own device. Altto never receives it, so there is nothing on a server to see, keep or delete.
Is an electronic signature legally valid in the UK?
For most everyday documents, yes — UK law recognises electronic signatures, including a signature image added to a PDF, for things like contracts, consent forms and agreements. A few documents are different: wills and some deeds need a handwritten signature and witnesses. If you’re unsure, check with whoever asked for the signature. (This is general information, not legal advice.)
What’s the difference between an electronic and a digital signature?
An electronic signature is any signature added electronically, such as the drawn or typed one this tool adds. A digital signature is a certificate-based, cryptographic seal that proves who signed and that the file hasn’t changed since. This tool adds electronic signatures, not certificate-based digital signatures.
Can I fill in a PDF form here?
Yes. If the PDF has fillable boxes, you can type into them, tick boxes and pick options right on the page. By default the answers are locked into the page when you download, so they look the same everywhere.
Will it show me where to sign?
Usually, yes. Altto reads the words on each page and marks places labelled things like “Signature”, “Sign here”, “Initials” or “Date” in yellow. Click a mark to fill it, use “Next place” to jump between them, or “Sign all” to put your signature in every marked spot at once. Scanned documents (pictures of pages) have no readable words, so you place items yourself there.
Can I undo a mistake or change the text size?
Yes. Use the undo and redo buttons (or Ctrl+Z and Ctrl+Y). Click any date, text or tick to change its size, colour or wording, and pick how the date is written — for example 27/09/2026 or 27 September 2026. Arrow keys nudge the selected item a little at a time, and the zoom buttons help with small print.
Can I sign on my phone?
Yes. Draw your signature with your finger, or type it, then drag it into place. It works in Safari, Chrome and other modern browsers.
Where is my saved signature kept?
Only if you tick “Remember on this device”, it’s saved in this browser on this device — nowhere else. You can remove it at any time with “Forget”, or by clearing your browser data.
Can I sign a password-protected PDF?
If it opens without a password but is protected against changes, yes: sign it as normal and Altto removes the change protection on your device when you download the signed copy. If it needs a password just to open, remove that first with our Unlock PDF tool (you need to know the password), then sign it here.
Can other people sign the same PDF?
Yes, one after another. Sign and download your copy, then send that file to the next person, who can add their own signature here in the same way. Each person signs on their own device, and nobody needs an account.
Can someone change the PDF after I’ve signed it?
A signature added this way becomes part of the page, but a PDF can still be edited with the right software. If you need proof that a document hasn’t changed since it was signed, use a certificate-based digital signature from a signing service instead.
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