How to Resize Many Images at Once (Batch Resize)
Resize, convert and rename a whole folder of photos in one go — same width, same format, consistent names — and download them as a single ZIP. Free, no upload.
3 min read ·
To resize a batch of images, open the Bulk Converter & Resizer, drop in all the photos, choose the output format, set a Target Max Width (or height, or a scale percentage), optionally set new names, and click Process & Download ZIP. Every image is resized the same way and you get one ZIP file — no clicking through photos one at a time.
Batch resize step by step
- Open the Bulk Converter & Resizer.
- Drag the whole set of images onto the box, or select them all at once.
- Choose the output format: JPEG, PNG or WEBP.
- Choose how to resize:
- Target Max Width (Pixels) — every image becomes this wide, with its height in proportion. Best for website and shop images.
- Target Max Height (Pixels) — useful when images sit side by side in a row.
- Scale Percentage — shrink everything by, say, 50%.
- Or keep the original size and only convert or rename.
- Optionally fill in a new base name, a Prefix_ or a _Suffix. Leave the name empty to keep the original file names.
- Click Process & Download ZIP.
Typical jobs
- Online shop product photos: all at 1200 or 1600 pixels wide, WebP or JPG, named consistently (blue-mug-01, blue-mug-02…).
- Website galleries: shrink camera photos to 1920 pixels for full screen, plus a separate 400-pixel batch for thumbnails.
- Email and sharing: 30 holiday photos at 1600 pixels fit into one email or upload quickly to a shared album.
- Real-estate listings and marketplaces that require a maximum size.
- Screenshots for documentation: convert PNG to WebP or JPG to cut their size.
Choosing the width
| Use | Max width |
|---|---|
| Full-screen web image | 1920 px |
| Content image or shop photo | 1200–1600 px |
| Email attachment for viewing | 1600 px |
| Thumbnail | 300–500 px |
Images smaller than the target aren't enlarged, so a mixed folder is safe to process with one setting.
Renaming in bulk
Cameras and phones produce names like IMG_4821.JPG, which say nothing. The renaming fields give every file a clean, consistent name with a running number — better for organisation, for shops that use file names as product images, and for image search on websites.
iPhone photos
If your batch includes HEIC photos from an iPhone, convert those first with HEIC to JPG (which also handles many at once), then resize the JPGs.
When you need more control
- One image with a preview — exact width and height, aspect ratio lock, target file size: use the Image Resizer.
- Smallest possible files with a quality slider and a size cap: the Image Compressor also works on batches and shows the saving for each image.
Tips
- Keep the originals. Batch-process copies, so you can redo it with different settings later.
- Check one image first. Run a small batch of two or three, check the size and quality in an image viewer, then process the rest.
- Large batches take memory. Hundreds of 12-megapixel photos at once can slow a phone or an older laptop; split them into batches of 50–100.
Frequently asked questions
Are my photos uploaded?
No. Everything is processed in your browser and zipped on your device.
Does it keep the aspect ratio?
Yes. Max width, max height and percentage all keep each image's proportions, so nothing is stretched.
Can I resize on my phone?
Yes, though large batches are faster on a computer.