Match the image to where it will appear
Hero images, post body images, and thumbnails do not need the same dimensions. Start with the actual destination size instead of exporting one oversized master file for everything.
ResizeResize images for the web,
Resize images for the web,
before they slow pages down
Match image dimensions to the actual layout first, then compress only if the file is still too heavy, all without uploading the original.
Custom · Keep original format · Smart optimization (recommended) · Post body (1200px)
Format
Quality preference
Resize
Drag & drop JPEG, PNG, WebP, or AVIF images
You can also click to choose files.
Supported formats: JPEG, PNG, WebP, AVIF.
Drop entire folders at once or seamlessly process ZIP archives with Pro.
JPEG, PNG, WebP, AVIF
Free 10 MB · Pro JPG/JPEG, WebP, AVIF 100 MB · PNG 40 MB
Some formats may produce different results depending on your browser environment.
Real Comparison
A real photo, compressed on-device.
This desert photo was compressed in KaruImg using the same in-browser process you get on the homepage. Drag the slider to compare the detail with the smaller file size.
Source size
5.3 MB
Result size
839 KB
Size reduced
84.5%
Sample photo licensed via Unsplash
Original
KaruImg result
What to know
Resize first when the image is physically too large
If the image is wider or taller than the space it will fill, resizing usually improves performance more cleanly than pushing compression harder.
Resize before stronger optimization
Once the pixel size is closer to the real display size, compression has less work to do and usually preserves detail more safely. That makes the final file easier to ship without over-processing it.
Why KaruImg
Smart compression, strictly private by design.
Drop in your images and let KaruImg lighten them in your browser. If there is no real size win, it safely keeps the original.
Processed right on your device
Fast and safe processing directly inside your browser without any installations or server uploads. Your files never leave your device.
Smartly keep the original
If there’s no size benefit, we keep the original—without degrading quality.
Automatic optimization flow
No complicated quality sliders. We analyze each file and automatically choose the best compression settings.