Sign any image format
Upload PNG, JPG, WEBP, or HEIC — including photos straight from an iPhone. PureSign decodes HEIC in the browser and corrects EXIF orientation so portrait shots stay upright.
Sign Image Online — Free
Upload a PNG, JPG, WEBP, or HEIC image, place your signature, and download the signed file in seconds. No account required.
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How to sign an image online
Upload, place your signature, and download — the whole thing takes about a minute and never leaves your browser.
- 01
Upload your image
Drag and drop your PNG, JPG, WEBP, or HEIC image, or click to browse. Files up to 50 MB are supported, and the image is processed in your browser — it 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 exactly
Drag your signature onto the image, then resize and rotate it to fit. Precise handles let you line it up perfectly on a contract photo, form, or scanned page.
- 04
Download the signed image
Click download to save the signed image in its original format. HEIC photos export as PNG, since browsers can't encode HEIC — everything else keeps its format.
Why sign images with PureSign
Format-aware image signing that respects your photos — and your privacy.
Keeps your original format
The signed image downloads in the same format you uploaded. HEIC files export as PNG (browsers can't encode HEIC), and JPEGs are composited onto white so there are no dark halos around the signature.
Everything runs in your browser
Signing happens entirely on your device with no upload to a server. As a guest, your image is never stored — close the tab and nothing remains behind.
No account, no watermark
Sign images for free without creating an account. There's no watermark stamped on your photo 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 you want on desktop and mobile.
Reuse your signature
Make a clean transparent signature once and drop it onto any image. Signed-in users can save signatures to a vault and reuse them across files and devices.
Frequently asked questions
Everything about signing images with PureSign.
How do I add my signature to an image for free?
Drop your PNG, JPG, WEBP, or HEIC image into the tool above, add your transparent signature, drag it into position, and click download. It's completely free, needs no account, and adds no watermark.
Can I sign a HEIC photo from my iPhone?
Yes. PureSign decodes HEIC images right in the browser and fixes EXIF orientation so portrait photos stay upright. Because browsers can't encode HEIC, the signed result downloads as a PNG.
What image formats can I sign?
You can sign PNG, JPG, WEBP, and HEIC images up to 50 MB. The signed file keeps its original format, except HEIC, which exports as PNG since browsers can't write HEIC.
Is my image uploaded or stored on a server?
No. Signing happens entirely in your browser. As a guest your image 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 photo?
Use the built-in signature maker to turn a photo of your handwritten signature into a clean transparent PNG, then drop it onto your image. You can also upload a transparent signature PNG you already have.
Can I sign an image 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 snap a photo and sign it straight from your phone.
Will the signature have a transparent background?
Yes, as long as you use a transparent signature PNG. PureSign places it directly on the image without a box around it, so only the ink shows — not a white rectangle.
Explore more PureSign tools
Make a signature, sign a different 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 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 image.
See pricing
Free to start, no account needed. Compare plan limits and what Pro unlocks.