Resize a whole folder of images at once
Set a width, lock the aspect ratio, and every image in the batch comes out at that size. Convert the format in the same pass if you need to.
- No upload
- No sign-up
- No watermark
- Unlimited files
- 100% local processingRuns in your browser. Files never leave your device.
- No uploads, no queueInstant results, even on large batches.
- No watermarksClean output, yours to use anywhere.
- Blazing fastModern browsers and the Canvas API make it quick.
How to resize an image
Drop in the images you want to resize. Mixed dimensions in one batch are fine.
Enter a target width, or a height, and leave the aspect ratio locked so the other side follows.
Pick an output format if you want to convert at the same time.
Convert and download, individually or as a ZIP.
Why it runs in your browser
- FastRuns locally at the speed of your own device.
- 100% privateYour files never leave your device. Ever.
- No limitsNo file size caps and no daily quota.
- LighterNo round trip means less data moved for the same result.
What you should know
Serving a 4000 pixel wide camera file into a 600 pixel wide slot is the most common image mistake on the web. The browser downloads every one of those pixels, decodes them, then throws most of them away when it draws the image. Resizing to something close to the display size before upload is worth more than any amount of compression on the original.
A reasonable rule is to export at twice the largest size the image will ever be displayed at, which covers high-density screens without waste. A full-width hero on a desktop layout wants around 2400 pixels; a blog body image wants around 1600; a thumbnail in a three-column grid wants around 800. Anything beyond that is data nobody sees.
Keep the aspect ratio locked unless you have a specific reason not to. Entering both a width and a height with the lock off will stretch the image to fit, which is almost never what anyone wants. With the lock on, set one dimension and the other follows.
Questions people ask
Can I resize several images to the same width at once?
Yes. Enter one width, drop in as many files as you like, and every output is produced at that width with its own aspect ratio preserved.
What size should images be for a website?
Roughly twice the display size. About 2400px for a full-width hero, 1600px for a blog body image and 800px for a grid thumbnail. Beyond that you are shipping pixels no one will see.
Will resizing make my image blurry?
Making an image smaller is safe and stays sharp. Making it larger cannot invent detail that was never captured, so upscaling will always look softer than the original.
Does it keep the aspect ratio?
By default, yes. Set one dimension and the other is calculated for you. You can unlock it if you deliberately want to stretch to fixed dimensions.
Images are one line item
Compressing them is the cheap half of page speed. If the rest of the site is still slow, or the traffic is not converting once it arrives, that is the part we actually get paid for.
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