Image Resizer
PopularResize images by pixels, percentage or to fit inside a box.
Input
Settings
Run
Results
Results will appear here once you run the tool.
About Image Resizer
Image Resizer changes the pixel dimensions of a picture six different ways, because "resize" means different things depending on why you are doing it.
Fit scales the image to sit inside a box you specify while keeping its proportions — the safe default, and the one you want for "make this no bigger than 1280 by 720". Exact forces both dimensions and will distort the picture if the aspect ratio does not match. Cover fills the box completely and crops whatever overflows, which is how you make square thumbnails from mixed-shape photos. Percent scales by a proportion, and width or height set one dimension and let the other follow.
Enlarging does not add detail. Scaling a small image up produces a bigger, blurrier version of the same picture — the information was never captured. The "never enlarge" option is on by default so a batch of mixed sizes does not quietly upscale the small ones into mush.
Pick the output format deliberately. PNG stays lossless and keeps transparency, so repeated edits never degrade. JPEG and WebP are far smaller for photographs. If you are resizing to put images on a website, WebP at quality 85 is usually the right answer.
Up to a hundred images at once, resized in your browser. Nothing is uploaded, so there is no size limit and no server that keeps a copy.
How to use Image Resizer
- Add your images. Drop in up to 100 pictures at once.
- Choose a resize mode. Fit keeps proportions inside a box. Cover fills and crops, for square thumbnails. Exact forces both dimensions and may distort. Percent, width and height do what they say.
- Set the dimensions. Enter your target size. Leave "never enlarge" on so smaller images in a mixed batch are not upscaled into blur.
- Pick a format and run. PNG to stay lossless, JPEG or WebP for much smaller photos. Press Run and download.
Frequently asked questions
Are my files uploaded when I use Image Resizer?
No. Image Resizer runs entirely inside your browser. Your file is read locally, processed on your own device, and handed straight back to you. You can confirm this yourself: open your browser's developer tools, watch the Network tab, and run the tool — no request carries your data anywhere.
Is Image Resizer free?
Yes, completely. No account, no sign-up, no watermark on your output, and no cap on how many times you can use it. The project is open source under the AGPL licence.
Is there a file size limit?
There is no server limit, because nothing is uploaded. The practical ceiling is your device's memory — on a modern laptop, files up to a few hundred megabytes are comfortable, while phones handle less. If a tab becomes unresponsive, the file was too large for the memory available.
Can I process several files at once with Image Resizer?
Yes — up to 100 at a time. When there are more than a few results they are packaged into a ZIP so you get everything in one download.
Does Image Resizer work offline?
Mostly. The site caches itself after your first visit, so it keeps working without a connection. Tools that need a specialised library — PDF editing, OCR, QR codes, MP3 encoding — need a connection the first time you run them, then that library is cached too.