Image Resizer
Resize images to exact dimensions or percentages
🔒 100% free · no signup · files never leave your device
Different platforms expect different image dimensions, and guessing wrong means cropped thumbnails, stretched avatars, or rejected uploads. A YouTube thumbnail wants 1280×720, an Instagram post 1080×1080, and a passport photo has its own strict millimeter-defined ratio. Resizing is also the most effective way to shrink file weight: halving the width and height of a photo removes 75% of its pixels before compression even starts.
This free image resizer lets you resize images online to exact pixel dimensions or scale by percentage, with an aspect-ratio lock that prevents distortion. It supports JPG, PNG and WebP, handles single files or batches, and processes everything locally in your browser — your images never touch a server. Whether you need to change image size for a social post, downscale camera photos for the web, or fit a strict upload requirement, you get pixel-precise results in one pass.
Why use Image Resizer
Fitting social media dimensions
Each network has its own preferred sizes for posts, covers and stories. Entering exact dimensions avoids the platform's automatic crop cutting off faces or text.
Downscaling camera photos for the web
A 24-megapixel photo is pure waste on a page that displays it at 1200 pixels wide. Resizing before upload cuts load time dramatically.
Batch-preparing a photo set
Applying one target width to a whole folder of images keeps a gallery or product catalog visually consistent.
Meeting application form requirements
Visa, exam and job portals often demand photos within exact pixel ranges — resizing precisely avoids a rejected application.
Pro tips
- Always downscale, not upscale: enlarging beyond the original resolution cannot recreate detail and only makes the image soft.
- Keep the aspect-ratio lock on unless you intentionally want to distort — stretching is the most common resizing mistake.
- For web use, resize to the largest size the image will actually be displayed at, plus 2× for retina screens — anything more is wasted bytes.
- Resize first, compress second. Resizing reduces pixels, compression removes redundancy; doing them in that order gives the smallest final file.
How to use Image Resizer
- 1Select an image
- 2Enter target width/height or a percentage
- 3Toggle aspect-ratio lock if needed
- 4Download the resized image
Frequently Asked Questions
Does resizing reduce quality?▾
Downscaling keeps quality high. Upscaling beyond the original size may soften the image.
Can I resize multiple images?▾
Yes — batch mode applies the same target size to all selected images.