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Image Resizer
Resize by exact pixels, percentage, or longest edge. Aspect ratio locks automatically. Instant preview, nothing uploaded to any server.
Drop your image here
or click to browse — JPG, PNG, WebP, GIF supported
JPG PNG WebP GIF BMP
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By Pixels
By Percent
Longest Edge
Width & Height
px
px
Aspect ratio is locked by default. Click the lock to unlock.
100%
Output: — × — px
25%
50%
75%
100%
150%
200%
Set the longest edge to
px
Output dimensions will appear here
Preview — click Resize to update
Preview will appear after resizing
Frequently Asked Questions
By Pixels — set exact width and height. Great when you need a precise output size like 1200×628 for social media.
By Percent — scale relative to the original. 50% makes the image half the size. Perfect for proportional reductions.
Longest Edge — set one dimension and the other scales automatically. Great for standardizing mixed landscape and portrait photos.
By Percent — scale relative to the original. 50% makes the image half the size. Perfect for proportional reductions.
Longest Edge — set one dimension and the other scales automatically. Great for standardizing mixed landscape and portrait photos.
Scaling down (making smaller) has minimal quality impact and is the most common use case. Scaling up (making larger) can cause blurriness since the browser interpolates missing pixels. For web use, scaling down is always fine.
When locked, changing one dimension automatically updates the other to maintain the original proportions. This prevents your image from looking stretched or squashed. Unlock only if you intentionally want to change the image’s shape.
Instagram post 1080×1080 (square) or 1080×1350 (portrait). Facebook post 1200×630. X/Twitter post 1200×675. LinkedIn post 1200×627. YouTube thumbnail 1280×720. Pinterest pin 1000×1500. Use our Social Media Resizer for one-click presets.
The tool handles images up to 16,000px per side, though very large images (over 50MP) may be slow on lower-powered devices since all processing is done locally in your browser. Most standard photos up to 20MP process instantly.