OneTaskWeb Performance Tools
Core Web Vitals Calculator, Page Weight, Gzip and Brotli Sizes, Cache Headers
Tools for faster websites. Understand Core Web Vitals, set a performance budget, estimate page weight and gzip savings, compress images to a target size, convert to WebP and AVIF, and generate resource hints and cache headers.
16 tools tagged Web Performance
AVIF Converter
Convert AVIF to PNG, JPEG or WebP, or encode to AVIF.
Blur-Up Image Placeholder
Make a tiny base64 LQIP and the code to blur-up images as they load.
Cache-Control Header Builder
Build a Cache-Control header and see exactly how browsers and CDNs will treat it.
Compress To KB
Hit an exact kB limit by searching for the right quality.
Core Web Vitals Calculator
Check whether your page passes Core Web Vitals and which metric to fix first.
CSS Size Calculator
Measure a stylesheet's real transfer size and see whether it blocks first paint.
Gzip / Brotli Size Comparison
Compare what gzip and Brotli save on a real file.
Image Size Calculator
Estimate image file size and see how oversized it is for its slot.
Image To WebP
Convert to WebP, JPEG or PNG with a quality slider.
JavaScript Size Calculator
See what a script bundle costs to download and to parse on a phone.
Lighthouse Score Explainer
See exactly where your Lighthouse performance score comes from.
Page Weight Calculator
Add up page resources, see the breakdown and load time on each connection.
Performance Budget Calculator
Turn a load-time target into a byte budget for each part of the page.
Resource Hint Generator
Generate correct preconnect, preload and prefetch tags with the right attributes.
SVG Optimizer
Strip editor cruft and round coordinates. See the bytes saved.
Video Background Generator
Generate background video code and ffmpeg commands for WebM, MP4 and poster.