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Understanding the 20 KB Target

A 20 KB ceiling is one of the most restrictive file size limits commonly encountered on digital admission forms, government portals, and signature submission systems. At this threshold, every byte of image metadata and encoding overhead matters.

Our compression engine uses binary search to find the closest valid quality setting that keeps your file strictly at or below 20 KB (20,480 bytes) without modifying your pixel dimensions unless you explicitly choose to resize.

Frequently Asked Questions

Why does my high-resolution photo say "Target unattainable"?

An image with millions of pixels has a physical baseline size even at the lowest quality setting. If the lowest achievable size exceeds 20 KB, the engine keeps your original dimensions intact and suggests an appropriate resolution reduction so you can decide how to proceed.

Will my image be exactly 20 KB?

The engine targets the closest valid result at or below 20 KB (typically between 18 KB and 20 KB). Most submission systems enforce a strict ceiling where any file over 20.0 KB is rejected, so staying slightly under ensures compliance.

Are my photos uploaded to a server?

No. All processing happens entirely inside your browser using client-side Web Workers and Canvas APIs. Your files are never uploaded to any remote server.