Thumbnail Resizer
Thumbnails need to be small, consistent and quick to load. This tool crops every image to the same shape and scales it to the same size, so grids and listings look tidy.
- Never uploaded
- Instant, no sign-up
- Works offline
Drop images here
Files stay in your browser — nothing is uploaded.
About this tool
It defaults to a 640×360 (16:9) thumbnail. Pick a square product or small preset, or type your own size.
How it works
- 1
Add all the images that need thumbnails.
- 2
Choose a thumbnail size.
- 3
Download them as a ZIP.
Features
- Uniform gridEvery thumbnail has the same shape and size.
- Fast loadingSmall pixel sizes plus JPG/WebP keep pages light.
- Bulk readyMake hundreds of thumbnails in one pass.
- Private by designEverything runs on your device. No uploads, no account, no watermark, and EXIF/GPS data is stripped from the result.
Supported formats
Input: JPG, PNG, WebP, GIF (first frame), BMP, SVG, AVIF, plus TIFF/HEIC where your browser can decode them. Output: PNG, JPG or WebP.
Frequently asked questions
What size should thumbnails be?
Common choices are 150×150 squares, 640×360 for video and 600×600 for products.
Should thumbnails be JPG or WebP?
WebP is smallest for websites; JPG works everywhere.
Is the image cropped?
Yes, from the center, so the thumbnail fills the shape without stretching.
Are my images uploaded to a server?
No. Files are decoded, processed and re-encoded by your browser using the canvas API and Web Workers. Nothing is sent to any server, and there is no account or storage. Closing the tab discards everything.
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Need more than one tool?
The full editor combines cropping, adjustments, filters, text, shapes and layers in one place.