What this tool does
Forms ask for a signature in black or blue ink on white paper, usually between 10 KB and 20 KB and a fixed width and height. A phone photo of a signature often has grey shadows and a yellow paper tint, which can make the form reject it. This tool cleans the background to pure white, keeps the ink dark, fits it to the size you choose and brings it under your KB limit.
How to use it
- Sign on plain white paper and take a clear photo.
- Choose the photo here.
- Pick the KB and pixel size from your form.
- Check the preview and tap Download.
Why 123ToolBox
Questions people ask
What size should a signature be for online forms?
Most forms ask for 10 KB to 20 KB. Check your form notice: it also gives width and height in pixels or centimetres.
How do I make the signature background white?
Keep “Clean background” on. It turns light grey and yellow paper to pure white and keeps the ink dark.
Can I use blue ink?
Yes. The ink colour is kept. Only the paper becomes white.
Is my signature uploaded?
No. It is processed on your device only.
My signature looks too small or cut off.
Take the photo close to the paper and crop it tight around your signature before choosing it.