Resize an image online in your browser
Maybe a form only accepts photos under 1200px wide, a forum caps avatars at 320x320, or a 4000-pixel phone shot is far bigger than the slot it needs to fill. Resizing an image changes its pixel dimensions so it fits where you want it without you opening heavy desktop software or learning a single menu.
The image resizer does this right in your browser. You drop in a file, type the dimensions you want (or pick a percentage or a ready-made social size), preview the result, and download it. Because everything runs on your own device, your pictures are never uploaded to a server, and there's nothing to install or sign up for. This guide walks through the whole thing, including how to keep your image from looking stretched.
How to resize an image
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Open the tool and add your image. Go to the image resizer and drag a file onto the drop zone, or click it to browse. It accepts JPG, PNG, GIF, and WebP, up to 20 files at once (25MB each). Once loaded, you'll see the original width, height, file size, and format listed at the top.
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Pick how you want to resize. Under Resize Settings there are three tabs. Use Custom Size to type exact pixel dimensions, Percentage to scale by a factor like 50% or 200%, or Social Presets to grab a standard size (Instagram post, YouTube thumbnail, LinkedIn banner, and so on) without looking up the numbers.
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Enter your target dimensions. On the Custom Size tab, type a new Width or Height. Keep the lock icon between the two fields turned on (it's the default) so the aspect ratio stays fixed: change one number and the other updates automatically, which stops the image from looking squashed. On the Percentage tab, drag the slider or tap a preset like 25% or 75% to shrink or enlarge proportionally.
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Choose your output format. Under Output Options, pick PNG, JPEG, or WebP. PNG keeps transparency and is best for logos and graphics; JPEG suits photos; WebP gives you the smallest file at good quality. For JPEG and WebP a Quality slider appears, where lower values mean a smaller file.
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Set a fit mode if your width and height don't match the original ratio. If you unlocked the ratio or used a preset with a different shape, choose a Fit Mode: Stretch fills the exact dimensions (can distort), Contain fits the whole image inside with padding, and Cover fills the frame and trims the overflow. For most resizes where you kept the ratio locked, the default is fine.
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Check the live preview and estimated size. As you change numbers, a preview updates and an estimated output size appears next to the dimensions. This lets you confirm the picture still looks right and see roughly how large the file will be before you commit.
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Run the resize and download. Click Resize, then download the result. If you loaded several images, you can resize them all to the same dimensions in one pass and download everything as a single ZIP. The saved file is named with its new dimensions so it's easy to find later.
Tips
- Shrinking is safe; enlarging is not. Making an image smaller looks clean. Scaling a small image up past its original size (over 100%) can't add real detail, so it gets soft or blocky. Start from the largest version you have.
- Need to cut part of the image away, not just shrink it? The resizer has a Crop Before Resize panel, or use the dedicated image cropper to remove edges first, then resize the result.
- Resizing for the web? After resizing, run the file through the image compressor to cut the file size further without changing dimensions. The full image optimization guide covers when to do each.
- Unsure what dimensions to target? The aspect ratio calculator works out the matching height for any width (or vice versa) so a custom size keeps its proportions.
Common problems
- The image looks stretched or squashed. The aspect ratio lock was off, or the fit mode was set to Stretch with mismatched dimensions. Turn the lock on so width and height stay in proportion, or switch the fit mode to Contain or Cover.
- Transparency turned into a white background. You exported as JPEG, which doesn't support transparency. Choose PNG or WebP as the output format to keep transparent areas.
- The file is still too big after resizing. Resizing reduces pixels, but format and quality also matter. Lower the JPEG/WebP quality slider, switch to WebP, or compress the result separately.
FAQ
Are my images uploaded anywhere? No. The resizer processes everything locally in your browser using your device's own resources. Your files never leave your computer, and there's no account or sign-up.
How do I resize an image without losing quality? Make it smaller rather than larger, keep the aspect ratio locked, and for photos export as JPEG or WebP at a high quality setting (around 85-92%). Downsizing rarely shows visible loss; only upscaling does.
Can I resize many images to the same size at once? Yes. Add up to 20 images, set one target size, and use the resize-all option. You can download them together as a ZIP, which is handy for a batch of product photos or thumbnails.
What's the difference between resizing and cropping? Resizing changes the overall pixel dimensions while keeping the whole picture. Cropping cuts away parts of the image to change its framing or shape. You can crop first inside the resizer, or use the standalone cropper.
Working with images? Pair the resizer with the image compressor, image cropper, and aspect ratio calculator to get every picture to exactly the size and weight you need.