Remove Background from Signature
Photograph or scan your signature, get a clean transparent PNG to drop into PDFs, Word documents and e-mails — without the signature ever leaving your device.
Background
Saves as PNG with transparency.
About the model
ISNet (DIS) general-use segmentation, Apache-2.0, quantised to int8 (44 MB). Runs in a Web Worker with ONNX Runtime on your CPU. Inference at 1024×1024, result composited at your image's resolution (up to 4096px; Pro: 8192px). The model is cached on your device after the first download.
What this tool does
It separates the subject from the background with ISNet — a dichotomous image segmentation network, Apache-2.0 — running on your device in a Web Worker with ONNX Runtime. The 44 MB model downloads from this site once and is cached; your image never leaves your browser. Full-resolution output up to 4096 px, no credits, no watermark.
Why this matters more than for other images
A signature is exactly the thing you should not upload to a random website. This page does the work in your browser: the model runs on your device, the page cannot talk to any server but its own, and nothing is stored. Sign in black or dark blue ink on plain white paper, photograph it in even light (or scan at 300 dpi), and drop it here.
Getting a clean result
Crisp edge and Crop to the subject are pre-selected. If the paper texture or a shadow survives, increase the contrast of the photo first (any phone editor), or re-shoot without a shadow across the page. Export PNG; insert into Word via Insert → Pictures, into a PDF via the sign/stamp tool, into Gmail/Outlook signatures as an image. Keep the PNG under a few hundred pixels high for e-mail — the resizer does that.
Limits and honesty
- Fine hair, fur and transparent objects are the hard cases; use Soft edge and expect touch-ups for critical work.
- The model picks the most salient subject; busy scenes with several equal subjects may keep more than you want.
- Inference is at 1024×1024 and the mask is resampled to your image's size; extremely fine detail on very large images is interpolated.
The full tool with every option lives at Remove Background.
Frequently asked questions
Is my image uploaded?
No. The page is static and has no upload endpoint; your browser does the work on your own device and the result is saved straight back to your disk. The site's Content-Security-Policy only allows it to talk to its own origin, so it cannot send your file anywhere even by accident. Load the page, disconnect from the internet, and it still works.
Is this safe for something as sensitive as a signature?
It is the safest way to do it online: nothing is uploaded, the CSP blocks any connection except to this site, and you can go offline after the page loads. The alternative — any site that uploads — leaves a copy of your signature on someone's server.
Does it work on a photo taken with a phone?
Yes. Even light and a straight-on angle matter more than resolution. Blue or black ink on white paper gives the cleanest edge.
Why does it download 44 MB the first time?
That is the neural network itself — it has to be on your device to run there. It comes from ai-pix.co.uk, is cached by your browser, and is not fetched again until we ship a new version.
Is it free? Any limits or watermark?
Free, no account, no watermark, no daily quota. Because nothing runs on our servers there is nothing to meter. The only limits are your device's memory — anything up to roughly 50 megapixels is fine on a modern phone or laptop.
Does it work on my phone?
Yes on recent phones; the first load is heavier on mobile data (44 MB) and each image takes 5–15 seconds.