Compress Image for PageSpeed Insights
PageSpeed Insights flags images >100 KB compressed size on mobile.
Your images stay on your device. Nothing is uploaded.
PageSpeed Insights' 'Efficiently encode images' audit flags any image that could be encoded more efficiently. The reliable ceiling that passes this audit is under 100 KB WebP for the main content area — typically at 1600 px retina width.
This preset produces a 1600 px WebP at quality 78 — PageSpeed-Insights-clean.
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Frequently asked questions
- How much can I shrink images for PageSpeed Insights?
- Typical reductions are 60–85% with no visible quality loss using the defaults on this page. PageSpeed Insights' 'Efficiently encode images' audit flags any image that could be encoded more efficiently. The reliable ceiling that passes this audit is under 100 KB WebP for the main content area — typically at 1600 px retina width.
- What format is best for PageSpeed Insights?
- For PageSpeed Insights the preset above outputs WEBP at quality 78 — the sweet spot for this workflow's LCP and CWV budget.
- 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 PageSpeed Insights assets.
Use the bulk compressor to process a folder in one go. Everything runs locally.
Start compressing