Bulk Image Compressor
Use this bulk image compressor to shrink hundreds of images at once. Drop a whole folder of JPG and PNG files, compress them all in your browser, and download everything as one ZIP.
Unlimited images, No File Size Limits.
Why use CompressImage.io to compress images in bulk?
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No Limits
As the compression is happening in the Browser, there are no limits on how many images you can convert or what size of image you can convert.
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100% Private
Since no images are sent to any servers, your images are totally safe and private as no one else can see your images.
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Low Carbon Footprint
Since no servers are involved in the compression process, zero extra electricity is used, hence no carbon emitted.
How to Bulk Image Compressor
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Add all your images
Drag an entire folder of JPG and PNG images onto the tool, or click Select Files and pick a batch. There is no cap on how many you add.
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Everything compresses in parallel
Your browser compresses each image as it arrives. No uploading, no queue, and no waiting behind other people's files.
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Download them all as a ZIP
Click Download Zip to grab every compressed image in one archive, with the original filenames kept. You can still save individual files too.
Why compress images in bulk in your browser
Compressing images one at a time is slow, and most batch tools upload everything to a server and make you wait in line. This bulk image compressor runs entirely in your browser, so it works differently:
- Every image is processed locally and in parallel, with no upload queue.
- There is no limit on how many files you compress or how large they are.
- One click packs the whole batch into a single ZIP.
- Your images never leave your device, and it is free.
Tips for bulk image compression
A little setup makes a big batch go smoothly:
- Choose your settings first. Set quality, a maximum width or height, and whether to convert to WebP before you add files, so every image gets the same treatment.
- Resize oversized images. When you are compressing photos for the web, set a maximum dimension so you are not shipping 5000px images into small containers.
- Use Recompress to adjust. Changed a setting after the first run? Hit Recompress to redo the whole batch with the new options. There is no need to re-add the files.
One format or many
Need to fine-tune a single format? Use the PNG compressor, the JPEG compressor, or the all-purpose image optimizer.
Frequently Asked Questions
How many images can I compress at once?
There is no limit. Because compression happens on your own device instead of a server, you can run dozens, hundreds, or thousands of images through a single batch for free.
Can I download all the compressed images together?
Yes. Click Download Zip to save every compressed image as one ZIP archive, with the original filenames kept intact.
Is there a maximum total size for a batch?
No. There are no file size or total batch limits. The only real constraint is how much memory your device has for a very large batch.
Are my images uploaded to a server?
No. Every image in the batch is compressed locally in your browser. Nothing is uploaded, so bulk compression stays private and works offline.
Can I apply the same settings to every image?
Yes. Set the quality, maximum width or height, or WebP conversion once in Settings and it applies to the whole batch. Use Recompress to re-run everything after you change a setting.