Thumb Impression Resize
Resize a photo of your left-thumb impression for forms that ask for a left-thumb impression alongside your signature to exactly 240×240px, 10–20KB. The tool centres the thumb mark and crops to a square frame, so you don't have to manually trim white space around it in a photo editor. This exact figure can shift between recruitment cycles — double-check it against your current form.
thumb impression left-thumb impression specification
- Size: 240×240 px
- File size: 10–20KB
- Background: white paper, black or dark-blue ink
How to photograph it well
Sign (or take the thumb impression) in dark ink on a plain white sheet — no ruled lines. Photograph it in good light, flat and straight-on, then upload here. Centres the thumb mark and crops to a square frame, then compresses to the 10–20KB band automatically.
How it works
Frequently asked questions
What size does thumb impression need for a left-thumb impression?
240×240 pixels, 10–20KB.
Do I need to crop out the white space myself?
No — upload the photo of your left-thumb impression as-is and the tool centres the thumb mark and crops to a square frame for you.
What if my photo comes out slightly under or over the KB range?
The tool re-compresses automatically until the file lands inside the stated range, so you don't need to guess a quality setting yourself.
Reviewed by Manoj Pathak & Pallavi Yadav, Toolzo team — updated 23 September 2026.