Signature Resizer and Background Remover
Turn a phone photo of your signature into a clean, cropped signature image at the right size in pixels and KB.
Runs in your browser. Your text and files never leave your device.
How to resize your signature
- Sign on clean white paper with a black or blue pen.
- Take a photo from straight above in good daylight, without shadows.
- Choose the photo here. The tool cleans the background and crops to your signature.
- Set the pixels and KB your form asks for, then press Download.
Getting a clean result
- If grey shadows from the paper remain, move the Background cleanup slider to the right.
- If thin parts of the signature disappear, move it to the left.
- "Fit inside" keeps the whole signature and adds white space to match the shape; "Crop to fill" trims the edges.
Need a photo instead? Use the image resizer in KB.
Frequently Asked Questions
How do I make a signature image for an online form?
Sign on plain white paper with a dark pen, take a photo in good light, and choose it here. The tool removes the paper background, crops tightly around your signature and resizes it to the pixels and KB you set.
How do I remove the background from a signature?
Choose PNG, transparent background under Format. The paper becomes transparent, so you can place the signature on documents, PDFs and images. The cleanup slider controls how dark a pixel must be to count as ink.
What size should a signature image be?
Forms set their own rules. A common shape is a wide strip such as 300 × 80 pixels under 20 to 30 KB, which is the default here. Always check the exact numbers in your form's instructions.
Can I change the ink to blue or black?
Yes. Pick Black or Blue under Ink colour to make every stroke one solid colour. This also fixes faint or uneven pen lines.
Is my signature uploaded?
No. The image is processed in your browser and never sent anywhere, which matters for something as personal as a signature.