Compress Image for Mobile Web (WebP, Under 200 KB)
Mobile web CWV budgets punish any hero image over 200 KB.
KB
WebP is typically 25–35% smaller at the same quality — useful when the target is aggressive.
Runs entirely in your browser — 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.
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