Image Resizer — Free Online Tool
Resize any image by specifying new dimensions, a scale percentage, or a target file size. Lock the aspect ratio to prevent distortion. The resize runs entirely via the Canvas API in your browser — no image is ever sent to a server. Supports PNG, JPEG, WebP, and more.
100% client-side. No uploads. Your data never leaves your browser.
How to use Image Resizer
- Upload an image by clicking the upload area or dropping a file.
- Choose resize mode: by dimensions, percentage, or target file size.
- Adjust width and height (aspect ratio locked by default).
- Click 'Resize' and download the result.
Frequently Asked Questions
Does resizing reduce file size?
Reducing dimensions reduces file size, but the actual savings depend on the output format and quality. Use Image Compressor if your primary goal is file size reduction.
Is the aspect ratio locked by default?
Yes. When you change width, height updates automatically to maintain proportions. You can unlock it to set independent dimensions.
What output formats are available?
PNG (lossless), JPEG (adjustable quality), and WebP (modern, smaller files).
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