PDFs stay PDFs
PureSign overlays your signature instead of flattening the page to an image. Text layers, embedded fonts, bookmarks, and metadata all survive — the file stays selectable, searchable, and crisp at any zoom.
Sign a PDF or Image — Free
Drop any PDF or image (PNG, JPG, WEBP, HEIC), place your signature, and download the signed file in seconds.
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How to sign a document online
Upload, place your signature, and download — the whole thing takes about a minute and never leaves your browser.
- 01
Upload your document
Drop a PDF or image (PNG, JPG, WEBP, HEIC) — PureSign detects the format automatically and opens the right editor. Files up to 50 MB are supported, and your document never leaves your browser.
- 02
Add your signature
Drop in a transparent signature PNG, or make one in seconds with the built-in signature maker. Don't have a saved signature? Sign on paper, photograph it, and let PureSign strip the background.
- 03
Place it exactly
Drag your signature to the right spot, then resize and rotate it to fit the signature line. Multi-page PDFs are fully supported — jump to any page and drop a signature where it belongs.
- 04
Download the signed file
Click download to save your signed document. PDFs keep their original text layers and metadata; images keep their original format (HEIC exports as PNG, since browsers can't encode HEIC).
Why sign with PureSign
Non-destructive signing that respects your files — and your privacy.
Sign images too
It isn't just for PDFs. Drop a PNG, JPG, WEBP, or HEIC photo of a contract or form and place your signature directly on the image, then download it in its original format.
Everything runs in your browser
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 documents for free without signing up. There's no watermark stamped on your file and no email wall — just upload, sign, and download.
Pixel-perfect placement
Drag, resize, and rotate your signature with precise handles that work the same with a mouse or a touchscreen, so it lands exactly on the line on desktop and mobile alike.
Reuse your signature
Make a clean transparent signature once and drop it onto any document. Signed-in users can save signatures to a vault and reuse them across files and devices.
Frequently asked questions
Everything about signing documents 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, and click download. It's completely free, needs no account, and adds no watermark to your file.
Does signing change or degrade 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 images as well as PDFs?
Yes. Upload a PNG, JPG, WEBP, or HEIC image and place your signature directly on it. The signed image downloads in its original format — HEIC files export as PNG, since browsers can't encode HEIC.
Are my documents uploaded or stored on a server?
No. 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?
Use the built-in signature maker to turn a photo of your handwritten signature into a clean transparent PNG, then drop it onto your document. You can also upload a transparent signature PNG you already have.
Can I sign a document 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 or image straight from your phone.
Can I sign multi-page PDFs?
Yes. Multi-page PDFs are fully supported — navigate to any page and place a signature exactly where it's needed. You can add signatures on more than one page before downloading.
Explore more PureSign tools
Make a signature, sign a specific file type, or check what Pro unlocks.
Sign a PDF
Go straight to the PDF editor. Overlay-based signing keeps text layers, fonts, and metadata fully intact.
Sign an image
Add your signature to PNG, JPG, WEBP, or HEIC photos and download the signed image in seconds.
Transparent signature maker
Turn a photo of your handwritten signature into a clean transparent PNG, ready to drop onto any document.
See pricing
Free to start, no account needed. Compare plan limits and what Pro unlocks.