Why batch resizing matters
Whether you're preparing product photos for an e-commerce store, uploading exam application photos, or optimising images for a website, batch resizing saves hours of manual work. Instead of opening each image individually, batch tools process everything in one go.
Method 1: Online batch resizer (Best for most users)
The fastest way to batch resize photos is using an online tool like PhotoResizer.in. Our tool supports multiple file selection — drag and drop all your images, set a target size in pixels or KB, and download them all at once.
- Pros: No installation, works on any device, free.
- Cons: Limited by browser memory for very large batches (100+ high-res images).
Method 2: Desktop software
For very large batches (500+ images), desktop applications like IrfanView (Windows), Preview (Mac), or GIMP provide batch processing features.
- IrfanView: File → Batch Conversion → set output size and format.
- Mac Preview: Select all images → Tools → Adjust Size.
- GIMP: Use the Script-Fu batch processor for advanced automation.
Compare these with our PhotoResizer vs Photoshop analysis.
Method 3: Command-line tools
Power users can use ImageMagick or FFmpeg for scripted batch operations:
mogrify -resize 600x600 -quality 85 *.jpgThis resizes all JPGs in the current directory to 600×600 px at 85% quality. See our PhotoResizer vs ImageMagick comparison.
Best practices for batch resizing
- Always keep the original files — resize copies, not originals.
- Use consistent dimensions for uniformity (e.g., all 800×800 for product photos).
- Choose JPEG at 80–85% quality for the best size-to-quality ratio.
- Test a small batch first before processing hundreds of images.