Compress image for WordPress Gallery
Gallery blocks in WordPress render 10–50 thumbnails per page. Keeping each under 100 KB is what makes them load.
Your images stay on your device. Nothing is uploaded.
The WordPress Gallery block renders images in a grid. Every image loads at once — 30 uncompressed 2 MB images is a 60 MB page. Landing each thumbnail at 80–100 KB WebP keeps the whole gallery under 3 MB.
This preset produces an 800 px WebP at quality 78 — sharp at typical thumbnail sizes, comfortably under 100 KB per image.
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Frequently asked questions
- What size should an image be for WordPress gallery thumbnail?
- The preset on this page reflects the recommended dimensions for WordPress gallery thumbnail. Uploading at these dimensions avoids the auto-crop or auto-downscale that the platform would otherwise apply.
- Does the platform re-encode after upload?
- Yes — most platforms re-encode uploaded images to their internal format and bitrate. Starting from a clean, correctly sized image means only one round of lossy re-encoding rather than two.
- What format should I use for WordPress gallery thumbnail?
- The preset uses the format recommended for WordPress gallery thumbnail. JPEG is the safest universal choice; some workflows benefit from WebP or PNG for specific reasons (transparency, screenshots, etc.).
- Is anything uploaded?
- No. The compression and resize run in your browser. The image only leaves your device when you upload it to WordPress gallery thumbnail yourself.
- Can I batch process multiple images for WordPress gallery thumbnail?
- Yes — use the bulk compressor to process a folder of images with the same settings. Every image gets the correct dimensions and quality for WordPress gallery thumbnail.
Prepare a WordPress — gallery thumbnail image.
Drop your image — the tool applies the correct dimensions and quality for the platform.
Start compressing