Compress Image to 30KB Online
Resize photos, signatures, and documents strictly under 30 KB for online portals and job forms.
Strict 100% In-Browser Binary Compression
Tested on 50+ official Indian exam engines (SSC, UPSC, IBPS, NTA, Passport Seva). Zero server upload, zero data collection.
Many online recruitment boards, college admission portals, state PSC exams, and government job forms require photograph or signature uploads to be compressed below 30 KB. ResizeInKB allows you to compress your images precisely under 30KB in seconds directly in your browser with zero quality loss.
How to Compress Image to 30KB Online
- 1Upload your photo or signature by dragging & dropping or clicking 'Upload Image'.
- 2The target size is automatically pre-configured to 30 KB.
- 3Adjust cropping or dimensions if required by your application portal.
- 4Click 'Download Compressed Image' to save your 30KB optimized file.
Target Specifications
Official Portal Upload Criteria Comparison
| Exam / Portal Name | Photo Limit | Signature Limit | Dimensions | Required Format |
|---|---|---|---|---|
| SSC (CGL/CHSL/MTS) | 20 KB - 50 KB | 10 KB - 20 KB | 3.5 x 4.5 cm | JPG / JPEG |
| UPSC Civil Services | 20 KB - 300 KB | 20 KB - 300 KB | 350x350 px min | JPG / JPEG |
| IBPS Bank Exams | 20 KB - 50 KB | 10 KB - 20 KB | 200x230 px | JPG (Black Ink) |
| NEET / JEE (NTA) | 10 KB - 200 KB | 4 KB - 30 KB | 4x6 Postcard | JPG / JPEG |
How Client-Side Image Binary Compression Works Under the Hood
When you select a target size (e.g., 20KB or 50KB), ResizeInKB executes an in-browser binary search algorithm using the HTML5 HTMLCanvasElement.toBlob() API. It dynamically adjusts JPEG quantization matrices and pixel dimensions directly inside your browser's V8 JavaScript engine memory. Because no HTTP requests send image data across the network, your processing is instant, works offline, and keeps your private photos completely secure.