Almost every online form in India rejects photos for the same two reasons: the file is too large, or the dimensions are wrong. These tools exist to fix that in a few seconds rather than by trial and error in a photo editor.
Government portals, exam boards and college admission sites set hard limits — a photo under 100KB, a signature under 20KB, specific pixel dimensions. Guessing at quality settings until a file happens to fit wastes time and usually damages the image more than necessary. Compressing to an exact target size, or resizing to exact dimensions, gets it right the first time. Beyond form uploads, these tools handle the everyday jobs: converting between JPEG, PNG and WebP, removing a background for a passport photo, and enlarging an image that is too small for print.
Always start from the highest-quality original you have — compressing an already-compressed image produces visibly worse results than compressing the original once. Resize to the required dimensions first, then compress to the size limit; doing it the other way round means you compress detail you are about to throw away, then damage what remains. For photographs use JPEG, and for documents, signatures or anything with sharp text use PNG.
Use the compress tool with 100 KB as the target rather than dragging a quality slider. It searches for the setting that lands closest to your limit, so you do not overshoot and lose more quality than the limit actually requires.
The compression, resizing, cropping and conversion tools all run in your browser — those images are never uploaded. Background removal is the exception: it needs a server, and that is stated on the tool.
JPEG for photographs, PNG for signatures, documents and anything with sharp text or transparency. WebP is smaller than both but not every government portal accepts it, so check before uploading.