Image Resizer Online
Resize an image to exact dimensions or a percentage, entirely in your browser. Free to use, no signup required for occasional use.
Runs fully in your browser via the Canvas API — nothing is uploaded.
What is the Image Resizer?
The Image Resizer lets you scale an image up or down to exact pixel dimensions or by a percentage of its original size, without installing any software or uploading your file to a server. It uses the browser's Canvas API to redraw the image at the new size, then lets you download the result as a PNG. This is useful for preparing images for websites, social media posts, email attachments, or any situation with specific dimension requirements. An optional 'lock aspect ratio' toggle automatically calculates the matching height when you change the width (and vice versa), so you don't distort the image while resizing.
How to use it
Upload an image, then choose either the 'Width × Height' mode to enter exact pixel dimensions or the 'Percentage' mode to scale relative to the original size. With aspect ratio locked, changing one dimension automatically updates the other to keep proportions consistent. Click 'Resize image' to generate the result, then use the download button to save the resized PNG to your device.
Frequently asked questions
Does resizing reduce image quality?
Enlarging an image beyond its original resolution can make it look softer since no new detail is created. Reducing size generally looks sharp.
Can I resize without keeping the aspect ratio?
Yes, uncheck 'Lock aspect ratio' to set width and height independently, which will stretch or squash the image.
What format is the downloaded file?
The resized image downloads as a PNG file.
Is the image uploaded anywhere?
No, resizing happens entirely in your browser using the Canvas API.