Thumbnail Generator

Create multiple resized thumbnails from one image at your chosen sizes.

How to use this tool

Drop one or more images.
Add the widths you want (default 150, 300, 600, 1200).
Choose quality and format.
Download all thumbnails as a ZIP.

How it works

Each image is downscaled to each requested width (preserving ratio) and encoded; fflate batches them into a ZIP.

Tips

Pair with WebP output for even smaller responsive assets.
Keep the aspect ratio — thumbnails that distort look broken.

Limitations

Only downscaling is possible — enlarging small sources adds no quality.

Frequently asked questions

Which sizes should I generate?

Common sets: 150/300/600/1200 for responsive sites, or 64/128 for icons.

How are thumbnails named?

name-150.jpg, name-300.jpg, etc., so the original name survives.

Can multiple source images be used?

Yes — drop several and it generates the same size set for each.