Compress Image to 100KB

Upload your image to Compresso and adjust the quality slider downward while watching the real-time output size. Keep adjusting until it reads under 100KB, then download. For faster results, use the target size mode which automatically runs a binary search to find the highest quality that produces a file under 100KB — typically converging in under a second.

For images at typical web dimensions (under 1000px wide), a 100KB JPG looks sharp and clear. For larger images (2000px+), you may notice compression artifacts. The solution is to resize the image to appropriate dimensions first — a 600×600 passport photo at 100KB looks excellent, while a 4000×3000 photo crammed into 100KB will show visible quality loss.

JPG is the most efficient format for photographs at small target sizes. WebP achieves even smaller sizes with slightly better quality retention. PNG should be avoided — as a lossless format, PNG files are much larger and can't be efficiently compressed to 100KB for photographic content. Convert to JPG during compression for best results.

The 100KB limit is common for official purposes: passport and visa applications worldwide, competitive exam registrations (UPSC, SSC, GATE, JEE, banking exams), university admission portals, professional licensing boards, government ID submissions, and job application forms. These organizations use strict limits to manage storage and ensure fast processing of millions of applications.

Passport photos are typically 500-600 pixels square. Upload yours to Compresso, ensure output format is JPG, and adjust quality to 60-75%. At passport dimensions, most photos comfortably fit under 100KB while maintaining the clarity required by immigration authorities. If your photo is larger, resize to 600×600 first.

Yes — Compresso is the safest option for compressing identity documents. All processing happens entirely in your browser. Your passport photos, ID scans, and personal documents are never transmitted to any server, never stored anywhere, and never accessible to anyone but you. When you close the tab, all traces are cleared.

Yes, and it's usually very easy. Scanned signatures are simple images with mostly white space and line work, so they compress extremely well. Upload your signature scan, convert to JPG, and it will typically be well under 100KB even at high quality settings. For extra-small signatures (under 20KB), reduce dimensions to 300×100 or similar.

If the lowest quality setting still produces a file over 100KB, the image dimensions are too large for the target size. Resize the image to smaller dimensions first — try 800×600 for general images or 500×500 for ID photos. Once resized, reaching 100KB becomes straightforward at reasonable quality levels.