Compress Image for Blog Thumbnail (Under 40 KB WebP)
Blog listing thumbnails render at ~ 300 px. Retina 600 px WebP is optimal.
Your images stay on your device. Nothing is uploaded.
Blog category / listing pages typically render post thumbnails at 300 px wide. Uploading at 600 px WebP keeps them retina-crisp and lets a listing page with 20 thumbnails still load under a 1 MB weight budget.
This preset produces a 600 px WebP at quality 80 — thumbnail-optimal.
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Frequently asked questions
- How much can I shrink images for blog thumbnail?
- Typical reductions are 60–85% with no visible quality loss using the defaults on this page. Blog category / listing pages typically render post thumbnails at 300 px wide. Uploading at 600 px WebP keeps them retina-crisp and lets a listing page with 20 thumbnails still load under a 1 MB weight budget.
- What format is best for blog thumbnail?
- For blog thumbnail the preset above outputs WEBP at quality 80 — 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 blog thumbnail assets.
Use the bulk compressor to process a folder in one go. Everything runs locally.
Start compressing