Resize images by exact pixel dimensions or percentage scale while locking aspect ratios.
Resize PNG, JPG, or WebP client-side
An Image Resizer adjusts the width and height pixel dimensions of digital photos to conform to specific layout or web banner requirements.
An image resizer changes the dimensions (width and height) of digital images to specific pixel values or percentages while maintaining aspect ratio. OneToolBox's Image Resizer processes PNG, JPG, and WebP files entirely in your browser using the HTML5 Canvas API — your images never leave your device. Resize images for social media profiles, email attachments, or web optimization without quality loss.
Slight quality reduction can occur when upscaling (making images larger). Downscaling (making smaller) generally preserves quality well. The tool uses high-quality bicubic interpolation for the best possible results.
Yes. The aspect ratio lock is enabled by default. When you change the width, the height automatically adjusts proportionally, and vice versa.
There's no artificial limit. The maximum depends on your browser's Canvas size support, which is typically 16,384×16,384 pixels in modern browsers.
No. All resizing happens locally in your browser using the HTML5 Canvas API. Your images never leave your device.
