Two Resize Modes
Resize by exact pixel dimensions or by percentage scale from 1% to 200%. Switch between modes instantly using the tab switcher in the sidebar, both modes show a live new-size preview before you download.
Resize Image in Pixels or KB
Resize an image by exact pixel width and height, by percentage, or down to a target file size in KB. Lock the aspect ratio so nothing stretches, then download. Runs in your browser, no upload, no account, no limit.
Resize Your Image
Drag & drop or click to select - JPG, PNG, WebP, GIF supported
100% in-browser - your image is never uploaded to any server.
Guide
How to Resize an Image in Pixels or KB
1
Upload Your Image
Drag and drop or choose any JPG, PNG, or WebP image.
2
Set Pixels, Percent, or KB
Type the target width and height in pixels or pick a percentage. To hit a file size, turn on Optimize File Size and enter the KB.
3
Download Your Resized Image
Click Resize and download the image at the exact size you set.
Resize an Image to the Exact Pixels or File Size
Designers, marketers, and developers all need precise pixel dimensions for hero images, banners, and avatars. Type the target width and height and the resizer outputs an image at exactly that size, with no rounding errors.
When a form or upload caps the file size, turn on Optimize File Size and set the KB. The tool steps the quality down until the image fits, so you can resize an image in KB without guessing. Need many files at once? The bulk image resizer handles a whole folder, while this single-image flow stays the fastest path for one-off assets.
Benefits
Why Use Our Image Resizer
Aspect Ratio Lock
Lock Aspect Ratio mode automatically calculates the matching dimension as you type. Change the width and the height updates instantly, and vice versa. Toggle the lock off for free-form stretching.
Fully Private
Everything happens in your browser. Your image is read on your device and never sent to a server. There are no file size restrictions and no account, just open, resize, and download.
All Image Formats
Supports JPG, PNG, WebP, GIF, BMP, and any image your browser can open. Downloads as a high-quality PNG, keeping transparency, or as a compressed JPEG when you set a target KB.
Resize to a Target KB
Turn on Optimize File Size and enter a size in KB. The resizer compresses the image to fit your limit, handy for upload forms that cap the file size.
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FAQ
Frequently Asked Questions
Common questions about resizing images online.
Will resizing reduce the image quality?
Enlarging an image (scaling up) softens it because the extra pixels are interpolated, there is no new detail to add. Scaling down generally stays sharp. For the cleanest result, resize down from a larger original rather than blowing up a small one.
What format is the resized image?
By default the resized image downloads as a PNG, which is lossless and keeps transparency. When you turn on Optimize File Size to hit a target KB, it downloads as a JPEG instead, since JPEG compresses to much smaller sizes.
Is there a maximum file size or image dimension limit?
There is no server-side limit because the tool runs entirely in your browser. Very large images may require more device RAM and processing time. Most modern devices handle images up to 20MP or larger without issues. If the browser tab becomes unresponsive on a huge image, try refreshing and using a smaller source file.
Can I resize a transparent PNG?
Yes. Transparency is fully preserved when you resize a PNG and keep the PNG output. The alpha channel carries through the resize, so transparent areas stay transparent. If you switch on a target KB, the output is JPEG, which has no transparency and fills with white.
How do I resize an image to a specific size in KB?
Upload your image, set the width and height you want, then turn on Optimize File Size and enter a number in KB, for example 100. The tool lowers the JPEG quality step by step until the file is at or under your target, then you download it.