How to make a signature image for an online form
Turn a photo of your signature into a clean, correctly sized image.
Sign on plain paper
Use white paper and a dark pen. Photograph it in good light, flat and straight, so shadows do not fall across the signature.
Enter the size your form needs
In the Signature Resizer, type the width, height and maximum KB your form shows. A wide, short shape is common for signatures, but check your form.
Frame and clean it
Use Zoom and the move sliders to place the signature inside the frame. Keep Make background white and Increase contrast ticked to remove the grey paper tint and darken the ink. Untick them if the signature looks too harsh.
Choose the file type
JPEG is smaller. PNG keeps edges sharper but can be larger and may not fit a small KB limit.
Download and check
Review the size shown, then download. Your files stay in your browser.
Last reviewed: 8 November 2026. Requirements set by portals and organisations can change; check the current rules before you submit.