100KB Extension v1.1.1: Compress & resize files in 0ms directly in Google Chrome
Batch compress multiple JPG, PNG, and WebP images at once locally in your browser. Process up to 500 photos to target KB limits with zero data leakage.
Processing hundreds of image files manually can take hours. 100kb.in uses multi-threaded browser WebWorkers to compress up to 500 images simultaneously in local RAM. Select your target KB size (10KB, 20KB, 50KB, 100KB, 200KB, 500KB) and download all optimized photos in a single .ZIP archive with zero quality loss.
| 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 optimize and prepare your files secure:
Select or drag up to 500 JPG, PNG, or WebP images into the multi-file bulk dropzone.
Choose your desired target size (50KB, 100KB, 200KB) or compression mode for all files.
Our parallel WebWorkers compress all images in seconds. Download all files in a single .ZIP archive.
Find answers to common questions about our free online tools.
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.