Image Thumbnail Generator
Image Tools · Free Online Tool
Batch generate thumbnails at specified sizes.
Multiple Sizes
Pick from 32, 64, 128, 256 and 512 pixel widths.
Aspect Preserved
Height is computed from the original aspect ratio.
One-click Download
Save each thumbnail individually as PNG.
How to Use Image Thumbnail Generator
- 1Upload your image file or drag and drop it into the tool.
- 2Adjust the tool-specific settings (quality, size, format, etc.).
- 3Click the process button to apply changes.
- 4Download the processed image.
Features
- ✓100% free — no signup, no subscription, no ads
- ✓Runs entirely in your browser — data never leaves your device
- ✓Fast and lightweight — instant results
- ✓Cross-platform — works on desktop, tablet, and mobile
Frequently Asked Questions
Are my images uploaded to a server?
No. All image processing happens locally in your browser using canvas and WebGL APIs. Your images never leave your device.
What image formats are supported?
We support JPEG, PNG, WebP, ICO, and BMP formats depending on the tool. See the tool description for specifics.
Is there a file size limit?
Images up to 20MB are typically supported. Larger files may cause performance issues on some devices.
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Learn the concept
Learn the concept
Understand the programming ideas behind this tool.