Signature Resizer for Online Forms
Resize a scanned signature to the size an exam form wants.
Your files stay on your device
Sizes change with every notification. Check the numbers below against your own form. Every box can be edited.
Signature
Choose your signature
Black ink on white paper. The blank paper is cropped away for you.
or drag and drop here
- New size
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- Dimensions
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How to use Signature Resizer
- Sign in black ink on plain white paper and photograph it from directly above, in good light.
- Choose the form you are applying to, or type your own numbers. Every box on the page can be edited.
- Add the photo. The blank paper is cropped away, the signature is turned grey, and it is compressed to fit.
- Check it is still readable in the preview, then download.
Why trimming comes first
A photographed signature is mostly blank paper. Compress the whole sheet down to ten kilobytes and those bytes go on white space, leaving the strokes as a smudge. This tool finds the ink, crops tightly to it with a small margin, turns it grey, and only then compresses. Almost the whole byte budget goes on the signature.
Getting a clean scan with a phone
- Sign with a black or dark blue pen on plain white, unlined paper.
- Photograph it in daylight, from directly above. An angle makes the signature look slanted and puts one side out of focus.
- Keep your own shadow off the paper. Stand beside it rather than over it.
- Fill the frame with the paper. The tool crops away the surroundings, but it cannot add detail that was never captured.
A worked example
A 3 MB phone photo of a signature on A4 goes in. The trim finds the ink and drops roughly 90% of the image as blank paper. What is left is redrawn at 140 × 60 px, turned grey and saved as JPEG until it lands under 20 KB. That is usually around 8 to 14 KB, and still easy to read.
Limits worth knowing
- The trim looks for pixels darker than near-white. A signature on grey or coloured paper, or one photographed in poor light, may not be found. The image is then left uncropped rather than cropped wrongly.
- Turning the signature grey both shrinks the file and matches what most portals expect. Blue ink comes out as dark grey.
- Some portals also set a minimum size. The tool warns you when the result falls below the minimum for the preset you chose.
- Specifications change every cycle. Every box on this page can be edited, so type what your own form asks for.
Frequently asked questions
Why does the tool crop my image?
Because a photographed signature is mostly blank paper, and compressing the whole sheet spends those bytes on white space. Cropping to the ink first means almost the whole byte budget goes on your strokes.
Why is my signature turned grey?
Grey files are much smaller than colour ones, and it is what most portals expect. Blue ink comes out as dark grey. If your form asks for colour, use the general resize tool instead.
What size does my form need?
Check the notification for your own exam, because the numbers change every cycle. The presets hold the sizes recent cycles have asked for, and you can type your own straight in.
My signature came out very small in KB. Is that a problem?
It can be, because some portals set a minimum as well as a maximum. The tool warns you when the result falls below the stated minimum. Photograph the signature again at higher resolution and in better light.
My signature was not cropped. Why?
The trim looks for pixels clearly darker than white. Grey or coloured paper, dim light or very pale ink can hide them, and the image is then left uncropped rather than cropped wrongly. Take the photo again in daylight with a darker pen.