How to Compress Your Signature to 10-30 KB for Exam Forms

Most Indian government exam forms require a scanned signature between 10-30 KB in JPEG format with specific pixel dimensions. Here is exactly how to get it right the first time.

Common signature requirements. SSC: 10-30 KB, 140×60 pixels, JPEG. IBPS: 10-20 KB, 140×60 pixels, JPEG. RRB NTPC: 10-30 KB, 140×60 pixels. The pattern is clear — most forms want a small JPEG under 30 KB at roughly 140×60 pixels.

UPSC is the exception, and it is the one that catches people. UPSC asks for a triple signature: sign your name three times, one below the other, on plain white paper in black ink, with a clear gap between each, then scan all three into a single image. That image must be JPG, 20-100 KB, 350-500 pixels, saved with the filename signature. Two things follow. First, the file you prepared for SSC will not do — it is the wrong content, not merely the wrong size. Second, 20 KB is a floor here, not a target: compressing a UPSC signature down to 12 KB puts it out of specification just as surely as going over the ceiling would.

Step 1: Scan or photograph correctly. Sign on plain white paper with a black or dark blue pen. Photograph in good lighting from directly above, or scan at 200 DPI. Crop tightly around the signature — leave minimal white space. The less background, the smaller the final file.

Step 2: Resize to required dimensions. Open your image in any tool and resize to the required pixel dimensions (typically 140×60). This single step often gets the file close to the target size because you are dramatically reducing the pixel count.

Step 3: Compress to target size. If the file is still too large after resizing, compress it. A tool like MiniPx lets you set a target file size (e.g., 20 KB) and compresses to exactly that. Save as JPEG — PNG signatures are usually larger because the anti-aliased edges of handwriting create many unique pixel values.

Why signatures are tricky. Unlike photos, signatures have high-contrast edges (dark ink on white paper) that do not compress as efficiently in JPEG. The artefacts around sharp edges are also more visible. That is why the required quality is lower (60-75% JPEG quality is normal for these uploads) — the forms are designed for it.

Pro tip: save your final signature file with a clear name like signature_140x60_20kb.jpg and keep it. Most government exam forms across SSC, IBPS, and RRB use the same specifications, so you can reuse it for multiple applications. Keep a second file for UPSC — the triple signature at 350-500 pixels and 20-100 KB, named signature — because that one is not interchangeable with the rest.

Related reading: Photo rejected? Common reasons · UPSC photo guide · Size requirements for govt forms