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Make your file fit what the form is asking for
Exact pixel size, an exact KB range — including the minimum, which is what actually gets uploads rejected and which almost every other tool ignores. Plus 115 free tools to merge, compress, and convert PDFs, photos, and documents. All in your browser; nothing is ever uploaded.
Fix a photo for an upload form →Whiten photo/signature background
Turn a light, fairly uniform background into pure white (or transparent) using a brightness cutoff — good for cleaning up a scanned signature or ID photo shot against textured paper. A simple brightness threshold, not AI subject detection, so it works best when the background is clearly lighter than the subject.
For a signature or ID photo scanned against off-white or textured paper, this cleans the background to pure white (or transparent) so it drops neatly into a form or document.
How Whiten photo/signature background works
- Drop your file into the tool, or click to browse.
- Everything runs in your browser — no upload, no server, no waiting.
- Download your result straight to your device.
Good to know: It works by a brightness threshold, not AI subject detection — so it excels when the background is clearly lighter than the subject and struggles when the two are similar in tone. It's fast and predictable rather than magic; a busy or dark background won't separate cleanly.
Common questions
Does this cut out any background like an AI remover?
No. It whitens or clears pixels above a brightness cutoff — ideal for a dark signature or face on a light background, but it isn't a general subject-cutout tool.