Compress Image to Exact KB
Universal client-side image compressor. Type any target size in KB (e.g. 25 KB, 75 KB, 350 KB) and get photos compressed to exact specifications.
Drop photos here or click to select
Compresses multiple JPG, PNG, and WebP images to exact target KB with 100% in-browser privacy
Step-by-Step Instructions
Upload Source Image
Select or drop your JPG, PNG, or WebP photo into the exact KB compression tool.
Enter Exact Target Size in KB
Specify the exact target file size in kilobytes (e.g. 15 KB, 35 KB, 75 KB, 150 KB) mandated by your portal or application.
Execute Binary Search Optimization
The engine runs multi-pass binary search iterations adjusting DCT compression tables and pixel scaling to match your exact KB target.
Download Perfectly Sized Image
Save your precisely compressed image guaranteed to stay within your required byte limits.
Key Features & Capabilities
- Custom exact target size compressor supporting any arbitrary kilobyte value (from 5 KB up to 5,000 KB)
- Iterative binary search optimization converging on your exact kilobyte threshold in under 500ms
- Dynamic pixel downscaling and chrominance subsampling preserving sharp facial features and signature clarity
- Multi-format support: inputs JPG, PNG, WebP, and outputs standardized JPEG
- Live byte counter displaying exact resulting size with percentage reduction metrics
- 100% private in-browser compression: confidential identity scans and certificates are never uploaded
Frequently Asked Questions
How does the exact KB compressor hit arbitrary target file sizes?
The compressor uses an automated binary search algorithm. It repeatedly samples different JPEG quantization parameters and slight dimension adjustments, measuring the resulting byte array size after each pass until it converges on a file size that is within 1-2% of (and strictly below) your requested target KB.
Why do government exam forms and portals require strange target sizes like 35KB or 45KB?
Different recruitment bodies (such as railway exams, state public commissions, and international visa portals) design their legacy upload forms with custom file size brackets (e.g., 'must be between 30KB and 50KB'). Entering an exact target like 45KB ensures compliance.
Can I compress transparent PNG images to an exact KB size?
Yes. The tool automatically composites transparent PNG layers onto a solid background (white by default) and applies the exact KB compression engine.
Are my uploaded photos or identity documents stored anywhere?
No. The entire compression process executes locally in your browser memory using HTML5 Canvas. No data is sent across the internet.
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