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Set any target file size in KB and compress your image to match it. 100% free, no uploads, works entirely in your browser.
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Most image compressors let you drag a quality slider and hope the result is small enough. This tool takes a different approach: you enter a target size in kilobytes — 20KB by default — and it automatically searches for the highest quality that keeps the file under that ceiling. The compression loop runs entirely inside your browser tab using the Canvas API, so your signature scans and passport photos never touch an external server.
The 20KB limit exists because it is the most common hard cap for scanned-signature uploads on Indian recruitment portals. Unlike 50KB (typically used for passport-size photographs) or 100KB (common for full-document scans), the 20KB requirement almost always applies to signature images — a small, high-contrast file where aggressive JPEG compression still preserves readability.
Why do government forms require exactly 20KB?
Recruitment boards process lakhs of applications and store every uploaded file. A 20KB cap on signatures keeps total storage and bandwidth manageable while still allowing a legible JPEG scan at around 140×60 to 300×100 pixels. The limit became a de facto standard after SSC and IBPS adopted it in the early 2010s, and other boards followed suit.
What's the difference between compressing to 20KB vs 50KB?
At 50KB you can fit a clear, colour passport-size photograph at reasonable dimensions. At 20KB you are working with a much tighter budget — the output works well for signatures and small monochrome scans, but full-colour photos will look noticeably softer unless you resize the image to smaller pixel dimensions first. That is why most forms pair a 50KB photo slot with a 20KB signature slot.
My signature scan is already under 20KB — will the tool change it?
No. If the input file is already at or below your target size, the tool leaves it untouched and returns the original file. No unnecessary re-encoding is applied.
The output is 18KB or 19KB instead of exactly 20KB — will the portal accept it?
Yes. Form portals enforce a maximum size, not an exact match. Any file at or below the stated limit is accepted. An 18KB result for a 20KB cap passes validation on every portal we have tested, including SSC, UPSC, IBPS, and NTA.
Can I use this tool on my phone?
Yes. The compressor works on any device with a modern browser — Chrome, Safari, Firefox, or Edge on Android, iOS, or desktop. Many applicants fill government forms on their phones, and this tool is designed to work seamlessly on mobile screens.
Is my signature or photo uploaded anywhere?
No. The entire compression process runs locally inside your browser. Your files are never sent over the network. You could turn off your Wi-Fi after this page loads and the tool would still function normally.
Need a higher size limit? Try the Compress to 50KB tool for photo uploads on government portals, or the Compress to 100KB tool for profile pictures and ID document uploads. Need to reduce dimensions first? Try Resize Image. For compression without a specific size target, use the Compress Image tool with the quality slider.