Compress Images to 100KB Online
Compress JPG and PNG photos to 100KB for Core Web Vitals and fast web pages. Lanczos-3 scaling with MozJPEG trellis quantization. 100% private in-browser.
Instant client-side compression · Up to 2 GB per file · Zero server upload
Technical Architecture & In-Browser Processing
Downscaling raster photos below 100KB is the industry standard for fast-loading mobile websites and satisfying Google Core Web Vitals Largest Contentful Paint (LCP) benchmarks. FitSize applies Lanczos-3 64-tap resampling, preserving razor-sharp high-contrast edges and fine text within graphics while applying selective frequency damping across noisy textures. MozJPEG trellis quantization strips redundant high-frequency DCT coefficients, leaving your web pictures crisp, colorful, and lightweight without halo artifacts.
Hitting a strict 100KB budget is essential for web developers looking to optimize Largest Contentful Paint (LCP) scores. Our browser engine deploys an 8-tap Lanczos-3 windowed sinc filter to preserve edge acuity while stripping bloatware camera metadata and color profiles, outputting lightweight WebP or MozJPEG files that load instantly.
Frequently Asked Questions
Why is 100KB optimal for mobile website photos?
Images under 100KB download in milliseconds on cellular connections, ensuring green Core Web Vitals scores.
Will high-resolution photos become blurry?
Lanczos-3 interpolation maintains distinct edges and clean lines without gaussian blurring.
Can transparent PNG graphics compress to 100KB?
Yes. Transparent PNGs are compressed with indexed 8-bit palette quantizers to maintain transparency.