JustilitySignature cleaner
Trim blank space, adjust ink contrast and create a transparent or white-background signature PNG.
Processed on your device. Your files are never uploaded by Justility.
How privacy worksHow it works
Choose a signature, adjust ink threshold, contrast, padding and output width, then compare the cleaned result before downloading.
Supported formats
Static JPEG, PNG, WebP and BMP; dark ink on a light plain background, up to 20 MB.
Good to know
Faint strokes, paper texture and shadows can be misclassified. Review every stroke. This is not handwriting recognition or authentication.
EXIF orientation is applied. Re-encoding may remove metadata and change color rendering. JPEG uses the selected solid background for transparency. Safety limits: 20 MB per image, 24 megapixels, and 8,192 px per side.
Using signature cleaner
Choose a signature, adjust ink threshold, contrast, padding and output width, then compare the cleaned result before downloading.
Faint strokes, paper texture and shadows can be misclassified. Review every stroke. This is not handwriting recognition or authentication.
Common questions
Are my inputs uploaded?
Justility processes this tool’s inputs locally and does not send them to a processing server. Public application assets are downloaded separately.
Can I use this without an internet connection?
Yes, after you prepare this tool from Offline help and the browser retains its assets. Installation is optional. All processing dependencies are bundled locally.