Signature Resizer

Signature requirements for online forms

Government exam portals, bank applications, university registrations, and job forms in Bangladesh, India, and across South Asia typically require a scanned or digital signature image in a specific pixel size and file size. The most common requirement is 300×80 pixels at no more than 20 KB, but this varies significantly between portals. Getting the format wrong causes the upload to fail or the signature to appear distorted in the preview.

This tool handles both the pixel dimensions and the file size in a single step. Select the preset that matches your form's requirement, optionally set the maximum file size, and download a JPG that meets both constraints.

Tips for a good digital signature

Sign on plain white paper using a dark ink pen, then photograph or scan the result. Crop to just the signature before uploading here. Photographs taken in good light with a steady hand produce the cleanest results. If the signature has a coloured or grey background, converting it to a clean black-on-white image first will give the best output - the resizer then pads it to the target dimensions with white fill.

If your form requires a specific file size in kilobytes rather than a fixed quality level, the resize to KB tool finds the exact quality needed to land at or below your target automatically.