Tool
Image Resizer
Set exact pixel dimensions or a percentage. Aspect ratio lock keeps proportions intact. Everything runs in your browser.
Drop a JPG, PNG, or WebP here, or click to browse
Resize your image in three steps
No software to install. Works in any browser, on any device.
Upload your image
Drop or click. JPG, PNG, and WebP all supported.
Set the new dimensions
Enter width, height, or both. Lock aspect ratio to avoid stretching.
Download the resized image
Download instantly. No account needed.
Resize dimensions
Width
800 px
Height
450 px
Aspect ratio lock
Lock width/height to scale proportionally. Prevents stretching or squishing.
Exact pixel dimensions
Enter the exact width and height you need in pixels.
100% private
Resized using Canvas API in your browser. Nothing uploaded.
About the Image Resizer
Resizing an image changes its pixel dimensions — the number of pixels that make up its width and height. A 4000×3000 photo resized to 1200×900 has the same content but fewer pixels, which means a smaller file size and faster load times.
Pixel dimensions mode lets you set an exact width and height. With aspect ratio lock on, changing one dimension automatically updates the other to keep the image from stretching. Turn it off when you need to fit a specific ratio — like 1:1 for a social media profile photo — even if it means cropping the visual content.
Percentage mode scales the image relative to its original size. 50% on a 2000×1500 image gives you 1000×750. Use 25% for thumbnails, 75% when you want a modest reduction. Values above 100% scale up — but making an image larger than its original always reduces sharpness (you're stretching existing pixels, not adding new detail).
JPG and WebP inputs are saved as JPEG (quality 92%). PNG inputs are saved as PNG with transparency intact. Download filenames include the new dimensions for easy identification.
Need more image tools? Compress Image, Crop Image, and JPG to PNG are all free and run entirely in your browser.
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Frequently Asked Questions
Can I make an image larger by resizing?
Yes, but enlarging beyond original dimensions reduces quality. Scaling up causes blurriness. Always start with the largest version you have.
Will resizing affect image quality?
Scaling down is nearly lossless. Scaling up adds interpolated pixels and introduces blur.
What's the difference between resizing and cropping?
Resizing scales all pixels. Cropping removes edge pixels without scaling. Resize for a different size; crop for a different portion.
What dimensions for social media?
Instagram square: 1080×1080. Story: 1080×1920. Twitter header: 1500×500. LinkedIn banner: 1584×396.