Your PDF stays a PDF
PureSign overlays your signature on the page instead of flattening it to an image. Text layers, embedded fonts, bookmarks, and metadata all survive — the file stays selectable, searchable, and crisp at any zoom.
Sign PDF Online — Free
Upload your PDF, place your signature, and download the signed file in seconds. No account required.
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How to sign a PDF online
Upload, place your signature on any page, and download — the whole thing takes about a minute and never leaves your browser.
- 01
Upload your PDF
Drag and drop your PDF or click to browse. Files up to 50 MB are supported, including multi-page documents. Your PDF is processed in your browser and never leaves your device.
- 02
Add your signature
Drop in a transparent signature PNG, or create one in seconds with the built-in signature maker. Sign on paper, photograph it, and PureSign strips the background to a clean PNG.
- 03
Place it on any page
Drag your signature onto the signature line, then resize and rotate it to fit. Navigate to any page and drop signatures, dates, or initials wherever the document needs them.
- 04
Download the signed PDF
Click download to save the signed PDF. Your signature is embedded as an overlay, so the original text layers, fonts, bookmarks, and metadata stay completely intact.
Why sign PDFs with PureSign
Non-destructive PDF signing that respects your file — and your privacy.
Sign anywhere, on any page
Place your signature exactly on the line, and add as many as you need across a multi-page contract — signatures, initials, and dates on every page that calls for them.
Everything runs in your browser
PDF signing happens entirely on your device with no upload to a server. As a guest, your document is never stored — close the tab and nothing remains behind.
No account, no watermark
Sign PDFs for free without creating an account. There's no watermark stamped on your document and no email wall — just upload, sign, and download.
Pixel-perfect placement
Drag, resize, and rotate your signature with precise handles that behave the same with a mouse or a touchscreen, so it lands exactly where it should on desktop and mobile.
Reuse your signature
Make a clean transparent signature once and drop it onto every PDF you sign. Signed-in users can save signatures to a vault and reuse them across files and devices.
Frequently asked questions
Everything about signing PDFs with PureSign.
How do I sign a PDF online for free?
Drop your PDF into the tool above, add your transparent signature, drag it onto the signature line on any page, and click download. It's completely free, needs no account, and adds no watermark.
Does signing degrade or flatten my PDF?
No. PureSign overlays your signature on top of the page rather than rasterizing it, so your PDF keeps its original text layers, embedded fonts, bookmarks, and metadata. The file stays selectable, searchable, and sharp at any zoom.
Can I sign multi-page PDFs?
Yes. Navigate to any page and place a signature exactly where it's needed. You can add signatures, initials, and dates across multiple pages before downloading the signed document.
Is my PDF uploaded or stored on a server?
No. PDF signing happens entirely in your browser. As a guest your document is never uploaded or stored — close the tab and nothing remains. Signed-in users control exactly what they choose to save.
How do I add my handwritten signature to a PDF?
Use the built-in signature maker to turn a photo of your handwritten signature into a clean transparent PNG, then drop it onto your PDF. You can also upload a transparent signature PNG you already have.
Can I sign a PDF on my phone?
Yes. The tool is fully responsive and runs in any modern mobile browser. The drag, resize, and rotate handles are touch-friendly, so you can sign a PDF straight from your phone.
Can I sign password-protected PDFs?
Encrypted, password-protected PDFs can't be opened for signing in the browser. Remove the password from the PDF first, then upload it and sign as normal.
Explore more PureSign tools
Make a signature, sign a different file type, or check what Pro unlocks.
Sign an image
Add your signature to PNG, JPG, WEBP, or HEIC photos of contracts and forms, and download the signed image in seconds.
Sign any document
One place to sign whatever you upload — PureSign detects the file type and opens the right editor automatically.
Transparent signature maker
Turn a photo of your handwritten signature into a clean transparent PNG, ready to drop onto any PDF.
See pricing
Free to start, no account needed. Compare plan limits and what Pro unlocks.