Image Resizer
Resize to exact dimensions or social media presets — instant & private
Drop images here or click to browse (up to 10)
JPEG, PNG, WebP, AVIF up to 50MB each
How It Works
Drop Your Images
Drop up to 10 images at once, paste from clipboard, or click to browse. Krunkit detects each image's dimensions automatically.
Set Dimensions or Pick a Preset
Type in exact pixel dimensions, or choose from built-in Instagram, YouTube, Twitter, and Facebook presets.
Download Resized Images
Resized images keep their original format. Download individually or as a single ZIP.
Common Social Media Image Sizes
Instagram Square
1080×1080px. The standard square post format. Works for both feed posts and is safe for most content types.
Instagram Portrait
1080×1350px (4:5 ratio). Takes up more vertical screen space in the feed. Recommended for maximum reach.
YouTube Thumbnail
1280×720px (16:9 ratio). High-resolution thumbnail required for HD videos. Minimum 640px wide.
Twitter / X Post
1200×675px (16:9 ratio). Optimal for in-timeline preview. Supports up to 4 images per tweet.
Facebook Cover Photo
820×312px on desktop, 640×360px on mobile. Use 820×360px as a safe size that works well on both.
LinkedIn Banner
1584×396px for personal profile. Company page cover is 1128×191px. Always test on mobile after upload.
Frequently Asked Questions
Does resizing reduce image quality?
Downscaling (making an image smaller) generally looks excellent and can slightly sharpen the image. Upscaling (making an image larger) will degrade quality because new pixel data has to be interpolated. Krunkit warns you when you're upscaling.
Does resizing change the file format?
No. Krunkit keeps your original format (JPEG stays JPEG, PNG stays PNG). Use the Convert tool if you also need to change the format.
What does 'Lock Aspect Ratio' mean?
When locked, changing width automatically updates height (and vice versa) to keep the original proportions. Unlock it to set completely custom dimensions — useful for crop-specific social media presets.
What's the maximum resolution I can resize to?
Up to 16,384×16,384px. In practice, very large output images may take a moment to process since resizing happens on the main thread via Canvas.
Can I batch resize multiple images?
Yes! Drop up to 10 images at once, or paste from your clipboard. All files are resized using the same dimensions or preset. Download individually or as a single ZIP.