100% Client-Side Private Image Resizer
Your sensitive personal photos, certificates, and ID cards never touch any server.
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.
Most online image compressors upload your sensitive personal files (ID cards, passports, bank statements, family photos) to distant third-party cloud servers. ResizeInKB works completely differently: 100% of image processing, resizing, and compression happens inside your local browser memory using HTML5 APIs.
How to 100% Client-Side Private Image Resizer
- 1Upload any sensitive document or personal photo.
- 2Notice that processing is instantaneous because no data travels across the internet.
- 3You can even turn off your Wi-Fi or mobile data after opening the page, and the compressor will continue working seamlessly offline!
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.