Image Resizer
Resize images online free. Change image dimensions, compress file size, convert between PNG, JPEG & WebP — no upload, all in-browser.
How Image Resizer Works
Everything runs in your browser via Canvas API. Your images never leave your device. Supports PNG, JPEG, and WebP output formats with adjustable quality. Perfect for social media images, thumbnails, and web optimization.
About the Image Resizer Tool
The Image Resizer changes the dimensions, format, and quality of your images all in one place. Oversized photos slow down websites, get rejected by upload forms, and eat through email attachments, while tiny images look unprofessional when printed or displayed large. Resizing solves both problems, and doing it in the browser means no software to install and no sending your files to a third-party server.
This is one of the most frequently needed image tasks there is. Bloggers resize and compress photos so pages load fast; store owners match product images to platform requirements; designers create the exact pixel dimensions a banner slot needs; and everyone shrinks phone photos before emailing or posting. Combined with the format and quality controls, one upload can produce a web-ready file in a single step.
How to Resize an Image
Upload your image, then set the width and height. Most of the time you should enter only one dimension and let the aspect ratio stay locked so the image does not distort; the tool keeps proportions intact unless you explicitly choose to override them. If you are preparing images for a specific slot - a 1200 by 630 social share card, a 300 by 300 avatar, or a 1920 pixel hero image - enter those exact values.
Next choose the output format. JPEG is the right default for photos because it compresses well with slight quality loss; PNG preserves transparency and is best for graphics, logos, and screenshots. Finally, set the quality. For web use, quality around 70 to 80 percent usually looks indistinguishable from the original while cutting file size dramatically. Generate, preview the result, and download when the file size and appearance look right.
When and How to Resize
- Resize before uploading to your site; a single 300 KB image instead of a 3 MB one makes every page load measurably faster.
- Respect platform limits - many forms reject files over a set size or dimension, so resize first instead of hunting for another file.
- For print, match the required pixels-per-inch rather than guessing; an image meant for print needs far more resolution than web.
- Save the resized file as a new file instead of overwriting your original so you can always go back to the full version.
- Batch the same settings across similar images so your whole gallery has consistent dimensions and quality.