Will resizing keep the aspect ratio?

Yes, when the lock is on (default) or when resizing by percentage. Unlock it to stretch images to an exact width and height.

What sizes work best for social media?

1080 px wide is a safe default for most feeds; 1920 px for full-HD banners. Larger images are usually downscaled by the platform anyway.

Resize one photo or a whole batch to exact pixel sizes or a percentage — ideal for Instagram posts, product listings and website images.

Processed locally in your browser — files are never uploaded

Drop your images here

or choose files from your device

JPG, PNG, WebP, AVIF, HEIC, GIF, BMP · up to 50 MB each · 50 files per batch · paste with Ctrl/⌘+V

Add multiple images and they are all resized with the same settings. With a fixed width and locked ratio, each image keeps its own proportions.

Downscaling uses the browser's high-quality smoothing. Choose PNG for lossless output, or JPG/WebP with a quality slider for smaller files.