How to Resize Multiple Images at Once
Resizing images one at a time is tedious. Whether you're preparing product photos for an e-commerce site, generating thumbnails for a blog, or standardizing profile pictures, bulk resizing processes dozens or hundreds of images in seconds — all at once, to the same dimensions.
- Batch resize images for web, social media, or print.
- When to Bulk Resize.
- Covers using the bulk image resizer.
- Covers maintaining aspect ratio.
- Covers combine with compression.
When to Bulk Resize
E-commerce product images need consistent dimensions (800×800, 1200×1200). Blog post thumbnails require a standard aspect ratio (16:9, 1200×675). Social media images have platform-specific sizes (Instagram 1080×1080, Twitter 1200×675). Profile photo standardization for directories. Print preparation requiring specific DPI and dimensions.
Using the Bulk Image Resizer
Upload multiple images (drag and drop or file picker), set your target dimensions (width, height, or both), choose whether to maintain aspect ratio or crop to exact dimensions, and click process. All images are resized in your browser — nothing is uploaded to a server. Download individually or as a zip file.
Maintaining Aspect Ratio
When you set only width (e.g., 800px), height scales proportionally — a 4000×3000 image becomes 800×600. When you set both width and height with 'maintain aspect ratio' checked, the image fits within those bounds without distortion (letterboxing if needed). With 'crop to fill' selected, the image fills the exact dimensions by cropping the excess — useful for thumbnails where exact dimensions matter.
background-size animation or @property registered custom properties instead.Combine with Compression
Resizing alone reduces file size significantly (a 4000px image resized to 800px drops ~96% of pixels), but you should also compress the output. After bulk resizing, run the results through the Image Compressor for optimal file sizes. Or use the Bulk Image Resizer's built-in quality setting to compress during the resize step.