Compress Image to 10KB — Free, Fast & Private
Many government exam portals and recruitment forms require digital signature files under 10-20KB. Indian exam portals like SSC, IBPS and state PSC specify strict signature size limits — often between 10KB and 20KB in JPEG format with specific pixel dimensions (typically 140×60 or 150×70 pixels). Meeting these exact requirements with a standard phone camera photo or scanner output is nearly impossible without a compression tool.
MiniPx makes hitting the 10KB target straightforward. The recommended settings for signatures are: JPEG output format, Tiny compression preset, and 400px max width. For most signature images, this combination produces files between 3-10KB — well within even the strictest portal limits. If your signature scan is a full A4 page, crop it to just the signature area before uploading to MiniPx for the best results.
Unlike other compression tools, MiniPx processes your signature image entirely in your browser. Your signature — which is a legally sensitive document — never gets uploaded to any server. This matters because a digital signature could be misused if it falls into the wrong hands. With MiniPx, your signature stays on your device from start to finish.
Signature size requirements for Indian exam portals
Each exam portal has slightly different requirements. UPSC CSE and IFoS applications require signatures between 20KB and 300KB in JPEG format. SSC CGL and CHSL specify 10-20KB at about 6.0×2.0 cm. IBPS PO and Clerk exams accept signatures between 10-20KB at 140×60 pixels. RRB NTPC and Group D ask for 30-49KB. State PSC exams vary but most accept 10-30KB in JPEG format.
The safest approach is to target 10-12KB — small enough for any portal, large enough to remain legible. After compressing in MiniPx, the tool displays the exact file size next to your image. If you need specific pixel dimensions, use the image resizer first to set exact width and height, then compress to the target file size.
Tips for compressing signatures to under 10KB
Start with a clean signature scan or photo. Use a white background with dark ink for maximum contrast. Crop the image tightly around the signature — extra whitespace adds file size without adding value. In MiniPx, set the output to JPEG format (not PNG — PNG files are much larger for this type of image), use the Tiny preset, and set Max width to 640px, its smallest setting. The result will be a sharp, compact signature file for a portal with a tight cap.
If you also need to compress a passport photo alongside your signature, use the 50KB compressor or 100KB compressor for the photo — those tools are pre-configured for photograph compression rather than signature compression.