How to resize image
- Add one or more images to the drop zone.
- Choose how to size them: Fit inside (never crops, never upscales past the box), Exact pixels, or Percentage of the original.
- Leave Keep aspect ratio on unless you deliberately want to stretch the image.
- Press Resize and download the results one by one or as a ZIP.
Why this runs in your browser
Almost every other free image tool uploads your file to a server, processes it there and sends it back. Resize Image does the work with the Canvas and File APIs that are already built into your browser, so the picture never leaves your device. That is faster for large files, it works on a plane, and it means there is no copy of your photo sitting in somebody's S3 bucket waiting to be deleted by a retention policy.
Frequently asked questions
How do I resize an image without losing quality?
Downscaling is safe — removing pixels rarely looks bad. Upscaling always invents detail and will look soft. Keep the output format as PNG for graphics and screenshots, and use quality 85+ if you output JPEG.
What is the difference between "fit inside" and "exact"?
Fit inside scales the image down until both sides fit within your box, preserving the aspect ratio, so a 4000x3000 photo fitted into 1000x1000 becomes 1000x750. Exact forces the precise numbers you typed, which distorts the picture unless the ratio already matches.
Can I resize many images to the same size at once?
Yes. Select the whole batch, set the dimensions once and press Resize. Every file is processed with the same settings and returned in one ZIP.
What size should I use for a website?
For full-width hero images 1920px wide is plenty; for in-article images 1200px; for thumbnails 400px. Serving anything larger than the container it renders in just wastes bandwidth and hurts your Core Web Vitals.