How to resize an image
- Pick an image — it loads instantly, right in your browser.
- Enter the new width or height (ratio stays locked unless you untick it).
- Click Resize, then Download your image.
Common sizes
- Instagram post: 1080 × 1080
- YouTube thumbnail: 1280 × 720
- Facebook cover: 851 × 315
- Full HD wallpaper: 1920 × 1080
Is it private?
Yes — resizing happens entirely on your device using your browser's canvas. Your image is never uploaded to any server, which also makes it faster than upload-based tools.
Benefits
- Resize to exact pixel dimensions in seconds.
- Your images are processed in the browser and never uploaded, so they stay private.
- Free and unlimited, with an option to keep the original aspect ratio.
Limitations to know
- Enlarging an image beyond its original size cannot add detail — upscaled photos look softer.
- Very large images may be limited by your device’s available memory.
- Saving re-encodes the image, which can introduce a tiny, usually invisible quality change.
Common mistakes to avoid
- Upscaling a small image and expecting sharp, high-resolution results.
- Turning off aspect-ratio lock and accidentally stretching the picture.
- Compressing first and resizing second — resize to the final dimensions first, then compress.
- Using dimensions that do not match the target platform’s recommended size.
Alternatives
To shrink the file size rather than the dimensions, use the Image Compressor. To change the file type, use the Image Converter, and to cut to a specific area or ratio use the Image Cropper.
Last updated: August 2026 · Reviewed by the AI Toolbox editorial team.
Frequently asked questions
Will resizing reduce quality?
Shrinking an image keeps it sharp. Enlarging beyond the original size can look soft — for big enlargements you'd want an AI upscaler.
Is there a watermark?
No watermark, no sign-up, no limits.