How to Resize Signature to 140x60 Pixels and Under 20KB for Exam Forms

Recruitment exam portals are notorious for rejecting signature uploads for reasons that have nothing to do with the signature itself — "image dimensions must be exactly 140x60 pixels" is a common validation rule, and most people's first signature photo comes out as whatever resolution their phone's camera naturally shoots at, often thousands of pixels in each dimension. Simply shrinking that photo down while keeping its original rectangular proportions almost never lands on 140x60 exactly, so the portal bounces the upload with a generic "invalid image dimensions" error and no further explanation.

The fix isn't really about compression — it's about deliberately overriding the aspect ratio to force an exact pixel target, something most basic photo tools don't expose as an option because they assume you always want to preserve proportions. A signature is unusual in that the exact pixel box matters more than keeping it perfectly undistorted, since these portals are rendering it into a fixed-size box on an admit card or application form regardless of what you upload.