Bulk Image Resizer
Resize multiple images at once by width, height, or percentage. Download individually or as a ZIP.
What is Bulk Image Resizer?
Bulk resizing lets you change the dimensions of multiple images simultaneously using a single set of parameters. You can resize by a target width (maintaining aspect ratio), a target height, or a percentage scale factor. This is ideal for preparing a batch of photos for a website, creating thumbnail versions of a product catalog, or standardizing a folder of images to consistent dimensions. All images are processed locally in your browser, and results can be downloaded individually or as a ZIP archive.
How to Use
- 1Upload multiple images by dragging them onto the drop zone.
- 2Choose resize mode: by width, by height, or by percentage.
- 3Enter the target value (pixels or percentage).
- 4Click "Resize N Images" to process all files.
- 5Download individual resized images or all as a ZIP archive.
Why Use This Tool
- ✓Batch processing — resize dozens of images with one click instead of processing them individually.
- ✓Flexible modes — resize by width, height, or percentage to suit different use cases.
- ✓ZIP download — get all resized images in a single convenient archive.
Frequently Asked Questions
What is the difference between resizing by width, height, and percentage?⌄
Resizing by width sets all images to the same width while maintaining their individual aspect ratios (heights will differ). Resizing by height does the same for height. Resizing by percentage scales each image by the same factor — a 1000px image at 50% becomes 500px, while a 2000px image becomes 1000px. Use width or height for consistent dimensions, percentage for proportional scaling.
Is the aspect ratio always maintained?⌄
Yes. When resizing by width, the height is calculated proportionally to maintain the original aspect ratio. When resizing by height, the width is calculated proportionally. When resizing by percentage, both dimensions are scaled by the same factor, which naturally preserves the aspect ratio.
How many images can I resize at once?⌄
There is no fixed limit — the constraint is browser memory. In practice, 50-100 images work smoothly. Very large batches of high-resolution images may take longer or cause memory issues on older devices. For very large batches, consider processing in groups of 50-100.
What format are the resized images?⌄
Each image is resized in its original format — PNG inputs produce PNG outputs, JPEG inputs produce JPEG outputs. The output format and quality match the input. If you need a different format, use the Image Converter tool after resizing.