Website Image Optimiser
Audit website images for size, format and dimensions — then optimise the whole batch with one click.
Image weight is the single biggest factor in slow web pages. Most sites have a handful of common problems: photos saved at full camera resolution (4000+ pixels wide), JPEGs that should be WebPs, and PNGs storing photographic content. The optimiser scans each image you drop in and recommends the specific change that matters for that file — WebP conversion, dimension cap, quality bump — then runs the recommended pipeline in your browser.
Heuristics are conservative: when a file is already small and correctly sized, the optimiser leaves it alone. Everything runs locally, so this works equally well for client work and confidential assets you wouldn't upload to a third-party service.
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Frequently asked questions
- How does the optimiser decide what to do?
- Per-image rules: photos wider than 1920px get resized down (a sensible max for most websites including high-DPI); JPEGs convert to WebP at q80 for a typical 25–35% saving; PNGs that store photographic content (judged by bytes-per-pixel) convert to WebP; lightweight graphic PNGs stay as PNG. Files under 200 KB that are already correctly sized are marked 'already lean' and left untouched.
- Is anything uploaded to a server?
- No. The audit and the optimisation both run in your browser. The recommendations are computed from each file's bytes and dimensions; the optimisation uses the same Canvas-based pipeline as the dedicated Compress and Convert tools.
- Why WebP instead of AVIF?
- WebP is the safe modern default — supported across every current browser, smaller than JPEG, supports transparency. AVIF is slightly smaller again but has slower decode on older devices and isn't yet supported by some image CDNs. If you want AVIF specifically, use the dedicated AVIF converter.
- Can I download everything as a ZIP?
- Yes. After running the optimisation pass, hit 'Download ZIP' and the cleaned files are packaged with their original names (the extension changes when the format changes — `hero.jpg` becomes `hero.webp`).
- Will the audit ever recommend a non-action?
- Yes — if the file is already small enough and correctly sized, the optimiser marks it 'already lean'. That gives you confidence that you've covered the right images and didn't miss any low-effort wins.