Your files never leave your device. All processing happens in your browser.
Open the Img Stop Bulk Image Compressor, add your images or a folder, choose Recommended compression (or set a max size such as 200 KB per image) and click Compress all. Each photo is compressed in your browser and you download all of them as one ZIP, usually 60–85% smaller.
About the Bulk Image Compressor
The Img Stop Bulk Image Compressor makes large batches of photos smaller in one click. Choose Light, Recommended or Strong compression, or set your own quality. You can also give every image a maximum file size in KB and a maximum width or height – perfect for upload forms, email attachments and websites.
Files are compressed on your own device, so even hundreds of photos never have to be uploaded. The summary shows exactly how much space you saved, and images that are already well optimized can be kept as they are so nothing ever gets bigger.
Key features
- One-click levelsLight, Recommended and Strong presets, or a custom quality slider.
- Max KB per imageEvery file is squeezed under your limit – quality first, then size if needed.
- Limit dimensionsShrink huge 4000+ px phone photos to 2000 px for big extra savings.
- Convert while compressingKeep the format or switch to JPG, WebP or AVIF for smaller files.
- Never biggerImages that are already optimized are kept, so no file grows.
- Total savings reportSee the size before and after for every file and the whole batch.
How to use the Bulk Image Compressor
- Add images or a folder Drop JPG, PNG, WebP or HEIC photos – or a whole folder – on the box.
- Choose compression Pick Recommended for the best balance, or set a max size in KB per image.
- Optional: limit size and format Set a max width or height and choose JPG, WebP or AVIF output.
- Compress and download Click Compress all, then download the ZIP or save the files to a folder.
Bulk Image Compressor at a glance
| Price | Free, no sign up, no watermark |
|---|---|
| Number of images | No fixed limit – hundreds at once |
| Input formats | JPG, PNG, WebP, HEIC, AVIF |
| Output | JPG, PNG, WebP or AVIF |
| Download | One ZIP, single files, or straight into a folder |
| Processing | In your browser – files are not uploaded |
When to use it
- Make a folder of photos small enough to email or share on WhatsApp.
- Compress all images for a website or blog to improve page speed and Core Web Vitals.
- Get every document scan under 100 KB or 200 KB for an online application.
- Free up storage by shrinking old camera and phone photos.
- Prepare product images for Shopify, WooCommerce or marketplaces.
Tips for the best result
- Recommended (around 78% quality) looks the same as the original to most people.
- For websites, combine a 2000 px limit with WebP output for the biggest savings.
- PNG screenshots compress best when converted to WebP or JPG.
- Use a max KB limit only when a form requires it – it may lower quality to fit.
Frequently asked questions
How much smaller will my images get?
Typical phone photos shrink by 60–85% with the Recommended setting. Adding a max width of about 2000 px or switching to WebP often saves even more. Images that are already optimized are kept as they are.
Can I compress every image below a certain KB size?
Yes. Enter a value in Max size per image, for example 100 or 200 KB. The tool lowers quality step by step and, only if needed, reduces the dimensions until each image fits.
Is bulk compression free?
Yes, it is completely free with no sign up, no watermark and no daily limit.
Does it work with PNG?
Yes. PNG files are reduced by smart color reduction, which keeps transparency. For the smallest files, convert screenshots and photos to WebP or JPG instead.
Are my files uploaded to a server?
No. Compression runs in your browser, so your images stay on your device and the tool works even with very large batches.
Learn more
- web.dev: Image performance – why smaller images make pages faster
Last updated October 30, 2026 by the Img Stop team.