100KB Extension v1.1.1: Compress & resize files in 0ms directly in Google Chrome
Resize image dimensions in pixels, mm, cm, or inches online. Crop photos in circle, square, or rounded corner shapes.
Application forms often require exact pixel dimensions (e.g. 600x600 px, 350x450 px, or 3.5cm x 4.5cm). Our Resize Image tool provides precision canvas scaling, DPI adjustments, and shape croppers (Circle, Square 1:1, Rounded Corners) to match official specifications.
Whether you are preparing a US Visa 600x600 pixel square photo, a Schengen Visa 35x45mm portrait, an SSC photo 350x450 pixels, an IBPS photo 200x230 pixels, or cropping profile avatars into circular shapes for social media, our engine scales canvas coordinates with bi-cubic interpolation and 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 the photo you wish to resize or crop.
Type width and height in px, mm, cm, or inches and select crop shape.
Our engine scales dimensions precisely with bi-cubic interpolation.
Save your formatted image ready for use.
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.
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