About Image Resizer (Batch)

Resize and crop multiple images in the browser. Part of the DevTools Surf developer suite. Browse more tools in the Images collection.

Use Cases

• Batch resize product photos for an e-commerce catalog
• Prepare multiple image sizes for responsive web design
• Crop screenshots to uniform dimensions for documentation
• Generate social media image variants from a single source

Tips

• Drag multiple images for batch processing at once
• Set exact dimensions or resize by percentage
• Crop images to specific aspect ratios for social media

Fun Facts

• The bicubic interpolation algorithm used in image resizing was described by R.G. Keys in 1981 and remains the default in most image editors.
• Social media platforms require wildly different image sizes: Instagram posts need 1080x1080, Twitter cards need 1200x628, and LinkedIn banners need 1584x396.
• Browser-based image processing using Canvas API can resize images at over 100 megapixels per second on modern hardware.

FAQ

Fixed size or percentage?

Both. Fixed dimensions (500×500) or percentage (50% of original). Pick based on target — fixed for design specs, percentage for proportional shrinking.

What about aspect ratios?

Toggle 'preserve ratio' to keep the shape. If both dimensions are fixed, the image crops to fit. If only one is set, the other scales proportionally.

How many images at once?

Browser memory caps around 100 at full-size. For thousands, use ImageMagick's `mogrify -resize` at the command line.

What output format?

Same as input by default. Toggle to change format (all to WebP, all to JPEG). Combined with quality setting for full re-encoding.