Image Resizer
Change an image's pixel dimensions with locked aspect ratio
Image Resizer: Exactly the Pixels You Need
Profile photo wants 400×400? Type it in — ratio preserved, instantly ready.
Websites and apps demand exact pixel sizes for images: 400×400 for profile photos, 1200×630 for cover images, 1000×1000 for product shots... This tool gets your image to the precise size required. Drag an image in and the width and height fields fill with its original dimensions. Type a new value — with 'lock aspect ratio' on, the other side is calculated automatically so the image never distorts. The result uses high-quality resampling and keeps the original format, PNG transparency included. Like our other image tools, everything runs in your browser: your file is never uploaded to a server. Downscaling also slashes file size — reducing a 4000-pixel photo to 1200 often shrinks the file to a tenth.
Features
Ratio Lock
Type one side, the other follows — no distortion ever.
Never Uploaded
Resizing happens entirely on your device.
Pixel Precision
Enter the exact target: 400×400, 1200×630...
Format Preserved
Original format kept, PNG transparency included.
Resizing Guide
Common target sizes
- Profile photo: 400×400 px
- Facebook/OG cover: 1200×630 px
- Instagram square: 1080×1080 px
- Full HD wallpaper: 1920×1080 px
Good to know
- Downscaling loses no quality; UPSCALING blurs
- With ratio lock on, the image never distorts
- Downscaling also cuts file size dramatically
- PNG input keeps its transparency
Frequently Asked Questions
Is my image uploaded to a server?
No. Resizing runs entirely on your device via the browser's canvas technology; your file is never sent over the internet. Sensitive images are safe to resize.
Why doesn't the image distort?
With 'lock aspect ratio' enabled, changing one side recalculates the other from the original ratio automatically. If you deliberately want a different ratio, disable the lock and enter both values independently.
What happens if I upscale an image?
Adding pixels can't create new detail; even with high-quality smoothing, an enlarged image softens somewhat. For best results, always downscale from the original and avoid enlarging.
Does downscaling reduce file size too?
Yes, dramatically: pixel count scales with the square of the edge length. Reducing a 4000-pixel photo to 1200 often shrinks the file by up to 90%.
What format does it download in?
The original format is preserved: PNG stays PNG with its transparency, JPG stays JPG, WebP stays WebP. To change the format as well, use our Image Converter tool.
I need to hit a specific file size (KB) — what's the workflow?
First downscale here to a sensible pixel size, then use the Image Compressor's quality slider to hit the target KB. Combining both tools yields the smallest file.