Signature extractor — transparent-background ink
Turn a photo of a signature into clean black ink on a transparent background. It runs entirely in your browser using canvas (0 uploads, works offline) — your file never leaves your device.
How to use it
- Choose a photo of a signature.
- Adjust the options.
- Download the result.
FAQ
How do I do this for free?
Choose the image and set an ink threshold, and this page keeps the dark ink and makes the rest transparent — on your device with no upload, no watermark and no account.
Is my file uploaded anywhere?
No. Everything happens in your browser and nothing is transmitted or stored, which you can verify by turning off your Wi-Fi. That is the whole point of an on-device tool.
Why does on-device processing matter here?
Your files stay private — nothing is sent to a server, so nothing can be logged, cached or leaked, and it keeps working offline.
What formats are supported?
Common image formats; output is a transparent PNG.
Limits
Runs in the browser, so very large files are limited by your device's memory; output is a standard image or file.
Related
The redact tool hides content; the image converter changes format.
Bookmark this page (Ctrl+D, or ⌘D on Mac) or install the app — it works offline the next time you need it.