Image Resizer
Resize images to any width and height. Maintain aspect ratio or set custom dimensions. Supports JPEG, PNG and WebP.
About the Image Resizer
Resizing changes the pixel dimensions of an image, which is different from compressing it. More pixels generally means a bigger file. Resizing lets you match the exact size required by a website, social profile, document or printer.
Keeping the aspect ratio locked prevents distortion: change the width and the height adjusts automatically. Prefer reducing size to enlarging. Enlarging stretches existing pixels and gives a soft, blurry picture, because no new detail is created.
Common targets include 1200 by 630 pixels for link previews, 1080 by 1080 for square posts and 1920 by 1080 for full HD screens. For print, quality depends on pixels per inch: a 6 by 4 inch print looks sharp at about 1800 by 1200 pixels (300 pixels per inch).
A 4000 by 3000 pixel photo resized to 1600 pixels wide with the aspect ratio locked becomes 1600 by 1200. The pixel count drops by about 84 percent, so the file becomes much smaller.
Tips for best results
- Resize first and compress second for the smallest file.
- Check the preview before downloading to make sure proportions look right.
How to use the Image Resizer
Why use Toolseza for Image Resizer?
Use this tool as often as you need with no paywalls, premium tiers, or hidden daily calculation quotas.
All calculations and file manipulations run inside your web browser. Your inputs are never sent to a cloud server.
Results update in real-time as you type or adjust settings, with instant one-click copy and export capabilities.
Works natively on smartphones, tablets, laptops, and desktop computers with zero installation or account creation.
Editorial Standards & Verification: All formulas, algorithms, and conversion factors implemented on Toolseza adhere to openly documented international standards (ISO, NIST, BIPM, W3C). Results are verified against benchmark reference datasets before publication.
Frequently Asked Questions
Does resizing reduce image quality?
Resizing to a smaller size may reduce detail. Use the quality slider to balance file size and sharpness.
Is my image uploaded to a server?
No — resizing uses the browser Canvas API. Your files never leave your device.
What image formats are supported?
JPEG, PNG and WebP are supported for input and output.