Image Resizer
Resize images to exact pixel dimensions or by percent (25, 50, 75, 150). Lock aspect ratio, choose PNG or JPG output. Browser-based, no upload.
Drop an image here or click to browse
Supports JPG, PNG, GIF, WebP, BMP
settingsResize Settings
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Use JPG for photos (smaller file size) and PNG for graphics with transparency. Lock the aspect ratio to prevent distortion.
What is the Image Resizer?
An image resizer changes the pixel dimensions of an image, either to a specific width and height or as a percentage of the original. It's how you fit a photo to a social media template, scale a screenshot for a doc, or downsample a large export to web-appropriate size without leaving the browser.
How to use the Image Resizer
- 1
Drop in your image
Drag the source file in or click to browse. The original dimensions and file size appear so you have a baseline.
- 2
Set new dimensions
Type a new width or height in pixels. Keep the lock icon on (default) so the other dimension scales proportionally.
- 3
Or pick a percentage
Quick buttons resize to 25%, 50%, 75%, or 150% of the original in one click. The first three downscale, 150% upscales.
- 4
Choose format and download
Pick JPG (smaller, no transparency) or PNG (lossless, supports transparency). Download saves the resized file with dimensions in the filename.
Frequently Asked Questions
What image formats are supported?
Input: JPG, PNG, GIF, WebP, BMP, anything the browser can decode. Output: PNG (lossless, transparency preserved) or JPG at 92% quality (smaller file, no transparency).
Does resizing reduce image quality?
Downscaling looks fine because pixels are averaged together. Upscaling always introduces blur, since new pixels have to be invented through interpolation. The Canvas API uses high-quality bicubic-style smoothing, but it can't recover detail that wasn't there.
Is my image uploaded to a server?
No. Decoding, resizing, and re-encoding all happen via the Canvas API in your tab. Open DevTools, switch to Network, and you'll see no outbound request when you click Resize Image.