100KB Extension v1.1.1: Compress & resize files in 0ms directly in Google Chrome
Reduce image file size in KB or MB online. Compress JPG, PNG, and WebP files securely without changing dimensions. Formatted for UK Visa (UKVI).
To ensure your photo is accepted by the United Kingdom official platform, it must meet the following strict criteria:
Disclaimer: These requirements are verified based on official guidelines. However, platform rules and guidelines can change. Always consult the official UK Visa (UKVI) portal before final submission.
British immigration authorities rely on automated biometric scans, making it critical that your UK visa photo possesses a plain cream or light grey backdrop rather than pure white. Our system meticulously calibrates your upload to the exact 45x35 millimeter standard, saving you from frustrating delays at the Home Office. Government job portals, university application systems, and e-commerce platforms impose strict file size limits on uploaded photos—most commonly requiring candidate photographs to be under 20KB, 50KB, or 100KB. Attempting to compress high-resolution smartphone photos (which are usually 3MB to 8MB) using basic tools often causes heavy pixelation, making faces unrecognizable.
100kb.in uses an iterative client-side binary search quantization engine. It converts RGB pixels to YCbCr color space, applies 4:2:0 chroma subsampling, and executes a 7-iteration binary search loop inside browser memory. In under 15 milliseconds, it selects the maximum quality setting that yields a byte size strictly under your requested target limit (e.g. 50KB or 20KB) while maintaining 300 DPI facial clarity.
| Format | Quantization Engine | Color Space & Subsampling | Target Size Ceiling | Portal Acceptance |
|---|---|---|---|---|
| JPEG / JPG | Lossy 8x8 DCT Frequency Quantization | YCbCr (4:2:0 Subsampling) | 20KB – 500KB | 100% (Universal Exam & Visa Portals) |
| PNG | Lossless Deflate / LZ77 Filtering | RGB + 8-bit Alpha Channel | 100KB – 2MB | E-commerce, Logos & Digital Design |
| WEBP | VP8 Intra-frame Prediction | YCbCr 4:2:0 / Lossless | 15KB – 300KB | Modern Web Apps & Mobile Display |
Follow these simple steps to ensure your file meets all requirements for UK Visa (UKVI).
Select or drag your JPG, PNG, or WEBP photo into the compression dropzone. Import a completely unedited portrait, ensuring there is absolutely no red-eye or digital retouching.
Choose a preset size limit (e.g. 20KB, 50KB, 100KB) or type a custom byte ceiling. Adjust the framing so your head fills approximately 29mm to 34mm of the vertical space.
The browser-based solver optimizes JPEG quantization matrices in milliseconds. Generate the standard 600x750 pixel digital file, guaranteed to fall within the 50KB to 10MB weight range.
Answers to common questions regarding requirements for UK Visa (UKVI).
Lead WebAssembly Systems Engineer at 100KB Tools. Technical specifications researched and cross-verified against official ICAO Doc 9303 Part 9 standards, ISO/IEC 10918-1 JPEG specifications, and PDF/A ISO 19005 guidelines.
Convert PNG and WebP images to JPG format online instantly. Compress file size to target KB limits for form uploads.
Convert JPG, JPEG, and WebP images to PNG format online instantly with loss-free quality and target KB limits.
Resize image dimensions in pixels, mm, cm, or inches online. Crop photos in circle, square, or rounded corner shapes.