What this tool does
Resizes images to specified pixel dimensions or a percentage of the original. Aspect ratio lock is on by default.
Image tool
Image Resizer
Resize images to exact pixel dimensions or by percentage. Maintains aspect ratio by default. Runs in your browser — no upload.
Complete guide
How to use Image Resizer
Image tools guide for image resizer users.
Resizing images is needed constantly: reducing a large photo before emailing, preparing thumbnails, resizing to platform specifications, or scaling up a small image. This tool handles all these cases with exact pixel or percentage control.
Aspect ratio lock prevents distortion — when you change width, height updates automatically to keep the same proportions. Uncheck it to stretch to arbitrary dimensions.
How to use it
Upload the image. Enter the target width or height (both update with ratio lock on). Or enter a percentage. Click Resize and download.
Upscaling note
Making an image larger (upscaling) reduces sharpness. For best upscaling results, use the Image Upscaler tool which uses AI-based upsampling.
Quick checklist
- Keep 'Lock aspect ratio' on to prevent stretching.
- For web use, resize to the display dimensions before uploading — don't let the browser resize it.
- Downscaling always looks good. Upscaling loses sharpness — use Image Upscaler for quality upscaling.
- For exact file size targets, use Resize Image by KB instead.
Answers
Image Resizer FAQs
Will resizing make the image blurry?
Downscaling (making smaller) looks sharp. Upscaling (making larger) introduces blur. Use Image Upscaler for quality enlargements.
Can I resize multiple images at once?
Yes — select multiple images. All are resized to the same target dimensions.
Does this upload my image?
No. Resizing runs on the Canvas API in your browser.
What is the maximum output size?
Limited by browser memory. Images above 8,000×8,000 pixels may cause issues on some devices.