Compress Image for Mobile Web (WebP, Under 200 KB)
Mobile web CWV budgets punish any hero image over 200 KB.
Your images stay on your device. Nothing is uploaded.
Google's Core Web Vitals thresholds punish LCP > 2.5 s on mobile. On a real 4G/5G connection with typical latency, that's about 200 KB per above-fold image. Anything larger risks a failing LCP score and lost mobile ranking.
This preset produces a 1400 px WebP at quality 80 — a retina-safe hero image for mobile viewports, well within CWV budget.
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Frequently asked questions
- How much can I shrink images for mobile web (generic)?
- Typical reductions are 60–85% with no visible quality loss using the defaults on this page. Google's Core Web Vitals thresholds punish LCP > 2.5 s on mobile. On a real 4G/5G connection with typical latency, that's about 200 KB per above-fold image. Anything larger risks a failing LCP score and lost mobile ranking.
- What format is best for mobile web (generic)?
- The default format for mobile web (generic) is WEBP at the preset above — chosen for the format's rendering compatibility and byte efficiency in this context.
- Will compression break transparency or animation?
- Transparency is preserved when the output format supports it (PNG, WebP, AVIF). Animation is preserved for animated WebP. JPEG output flattens transparency to white.
- Can I compress dozens of images at once?
- Yes — use the bulk compressor. Drop a folder or multi-select files; the queue processes them in order with progress per file, and you can download all results as a ZIP.
- Do my images get uploaded anywhere?
- No. The tool runs entirely in your browser — important for client work, internal assets, and anything not yet published.
Optimise the rest of your mobile web (generic) assets.
Use the bulk compressor to process a folder in one go. Everything runs locally.
Start compressing