How to Batch Resize Images for Free
Need to resize a batch of product photos, screenshots, or blog images to the same dimensions? Doing it one by one in Photoshop or Preview is painfully slow. This guide shows you how to resize, convert, and rename multiple images at once — then download everything as a zip file.
Common Problems
- Resizing images one by one wastes time, especially for 10+ files
- Online tools often upload your images to a server (privacy concern)
- Desktop software like Photoshop is overkill for simple batch resizing
- You need consistent dimensions across all images (e.g., 800px wide for a blog)
What Is Image Batch Resizer?
Image Batch Resizer is a browser-based tool that lets you resize multiple images at once, convert them to JPEG/PNG/WebP, and optionally rename them with a consistent prefix. Everything runs in your browser — your images are never uploaded to any server.
How to Use It
Step 1: Add your images
Drag and drop your images onto the drop zone, or click "Choose files" to select them. You can add as many images as you need. A thumbnail grid will show all selected images with their original dimensions.
Step 2: Choose your settings
Configure the output to match your needs:
- Resize mode: Resize by width (maintains aspect ratio), by height, exact dimensions, or no resize (format conversion only).
- Format: Choose JPEG, PNG, or WebP output.
- Quality: Adjust JPEG/WebP quality (10–100%). Lower values mean smaller file sizes.
- Naming: Keep original filenames or use a prefix with sequential numbering (e.g., product_001.jpg, product_002.jpg).
Step 3: Process and download
Click "Resize & Download" and all your images will be processed in your browser. When done, a zip file containing all resized images is automatically downloaded.
Use Cases
- Resize product photos to consistent dimensions for an e-commerce store
- Prepare blog post images at 800px or 1200px width
- Convert screenshots from PNG to JPEG to reduce file size
- Batch rename files with a clean naming convention before uploading
- Compress images for faster website loading
Tips
- For web use, 80–85% JPEG quality offers the best size-to-quality ratio
- WebP format typically produces 25–30% smaller files than JPEG at the same quality
- Use "By width" resize mode to maintain aspect ratio while hitting a target width
- The "No resize" mode is useful if you only want to convert formats or rename files
FAQ
What image formats are supported?
You can upload any browser-supported image format (PNG, JPEG, WebP, GIF, BMP, etc.) and export as JPEG, PNG, or WebP.
Is there a file size limit?
There is no hard file size limit. All processing happens in your browser, so performance depends on your device. Most users can handle dozens of images without issues.
Are my images uploaded to a server?
No. All image processing happens entirely in your browser. Your images never leave your device.
Summary
Image Batch Resizer handles the tedious work of resizing, converting, and renaming images in bulk. It runs entirely in your browser, so your files stay private. Try it now — it's free for up to 3 images.