Signature compressor
Check both ends of a signature file-size range. Set the required pixels, then see whether JPEG encoding or padding brings the result into that range.
Drag an image in, paste, or click to choose
A whole folder works too · Ctrl/Cmd+V pastes · on phone this opens your file picker · up to 40 MB per file
How the signature compressor targets a KB range
Enter the required width, height, minimum KB and maximum KB. This page starts at 140×60 pixels and 10–20 KB, with Custom fields for other requirements. The crop fixes the output dimensions before the tool searches JPEG quality against the upper byte limit. If the encoded file falls below the minimum, a JPEG comment block adds bytes without changing the encoded picture. The result reports the total and the added padding separately. Check its range status: fixed dimensions and a very small ceiling can still produce an oversized result.
Where this compressor falls short
- The initial 140×60 pixel and 10–20 KB figures serve as editable defaults. You must check your specific exam or government form and enter its exact requirements.
- The output keeps the chosen pixel dimensions during the size search. If the ceiling cannot be reached, review the failed-range result instead of treating the download as compliant.
- Padding adds bytes without improving handwriting or image detail. It cannot guarantee acceptance by an upload service.
Questions about signature compression
Why can a signature below the maximum still fail a size check?
A form may specify a minimum as well as a maximum. Compare your file with both numbers and with the required pixel dimensions. Other rejection reasons need to be checked separately.
How do I change the target from 140×60 pixels to my form's rules?
Overwrite the width, height, minimum KB, and maximum KB values in the custom fields before you upload or crop your file. The engine will adapt to your new parameters.
What does the padding step change?
It inserts non-image bytes into a JPEG comment block. The reported file size increases while the encoded picture stays the same. Review the total against your own minimum and maximum.
Should I use a general image compressor instead?
Use the general compressor when you only have an upper byte limit. This page also fixes a crop size and tries to meet a lower byte limit, so it is useful when the instructions specify all three.
