Image Resizer
Image Tools · Free Online Tool
Resize images with optional aspect-ratio lock.
Aspect-Ratio Lock
Toggle the chain to keep proportions — change one dimension and the other follows.
High-Quality Scaling
Uses canvas imageSmoothingQuality: "high" for crisp downscaling.
PNG Output
Resized images are exported as lossless PNG with the new dimensions in the filename.
How to Use Image Resizer
- 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.
Related Tools
Image Format Converter
Convert between PNG, JPEG and WebP formats.
QR Code Decoder
Decode QR codes from uploaded images.
SVG Optimizer
Minify SVG by removing comments, metadata and whitespace.
Image Cropper
Crop images with adjustable aspect ratio via Canvas.
Image Rotator
Rotate images by any angle and export.
Image Flipper
Flip images horizontally or vertically.
Image Filter
Apply grayscale, sepia, invert and other Canvas filters.
Image Color Picker
Pick colors from any image pixel, output HEX/RGB.