Is my folder structure kept?

Yes. When you drop or select a folder, every image keeps its relative path, including all subfolders. You get the same tree back in a folder with -compressed added to its name, as one ZIP file or saved straight to disk, so you can compare it with the original and put it back in place. Keep a backup of the originals until you have checked the result.

How many images can I compress at once?

Up to 10,000 images per batch. The practical limit is the memory of your device, because the compressed files are kept until you download them. For very large batches, Save to folder in Chrome and Edge writes the files to disk without building one big ZIP file.

Do the file names stay the same?

With the output format Same as original, every file keeps its exact name and extension. When you convert to WebP, JPG or PNG, only the extension changes. If two files would end up with the same name, a number is added to the second one.

Why are some files marked as original kept?

Some images are already optimized so well that compressing them again would make them larger. With the option Keep the original when the result is not smaller switched on, those files are copied unchanged, so nothing in your batch ever grows.

Which formats are supported?

JPG, PNG, WebP, GIF, BMP, AVIF, HEIC and TIFF, also inside ZIP files. The output is JPG, PNG or WebP. Animated GIF, WebP and PNG files are kept unchanged, so their animation is not lost.

What happens to EXIF metadata such as the GPS location?

By default it is removed, which makes files smaller and safer to publish. Turn on Keep EXIF data to copy the original EXIF block into the JPG output; the orientation is corrected so photos stay upright. Files that are kept as original keep all their metadata.

Which output format should I choose?

Same as original is the safest choice for website folders, because nothing needs to be renamed. WebP usually gives the smallest files and keeps transparency. JPG is best for photos that must work everywhere, and PNG is lossless, which suits screenshots and graphics but rarely makes files much smaller.

Batch & folders

Bulk Image Compressor

Compress hundreds of images in one go, including whole folders with subfolders. You get everything back in the same folder structure, and not a single file is uploaded.

Drop images, folders or a ZIP file here

JPG, PNG, WebP, GIF, AVIF, HEIC and TIFF. Subfolders are kept.

Compressed in your browser. Nothing is uploaded.

Quality 80%

80% is a good balance for photos. Lower means smaller files.

Output format

Same as original keeps every file name, so the folder can go straight back to where it came from.

Resize

Smaller images are never enlarged.

Keep the original when the result is not smaller Keep EXIF data in JPG files (date, camera, location)

File	Original	Compressed	Saved	Actions

Just one image? The Image Compressor shows the original and the compressed version side by side while you move the quality slider. Kompresor obrazów

Whole folders at once

Drop a folder with subfolders and get the exact same structure back, as one ZIP or straight into a folder.

Nothing is uploaded

Every image is compressed on your own device, so even thousands of private photos never leave your computer.

Fast, in parallel

Several processor cores work at the same time, so large batches finish in minutes instead of hours.

Never larger than before

Files that are already optimized are kept as they are, and animated GIFs stay animated.

Compress hundreds of images at once, folders included

Optimizing images one by one is fine for a single photo, but not for the upload folder of a website, a complete photo shoot or a product catalog. The Bulk Image Compressor processes the whole set in one go and keeps your folder structure intact, so the result can go straight back to where it came from.

What does the bulk image compressor do?

It re-encodes every JPG, PNG and WebP image at the quality you choose, scales down oversized photos if you want, and converts formats such as HEIC, TIFF, BMP and AVIF along the way. Files keep their names and their place in the folder tree, so links on your website or in your documents keep working.

How to compress a folder of images

1 Drop a folder, a selection of images or a ZIP file onto the tool, or use the Select folder button.
2 Choose the quality, the output format and, if needed, a maximum size for the longest side.
3 Click Compress images and follow the progress per file.
4 Download everything as one ZIP with the same folder structure, or save it straight into a folder on your computer.

Why compress images in bulk?

Faster websites: smaller images load quicker and improve Core Web Vitals such as LCP.
Less storage and bandwidth: photo archives and backups often shrink by more than half.
Easier sharing: compressed photo sets fit within email, chat and upload limits.
Consistent results: every image in the batch gets the same quality and size settings.

Private by design

The images are processed by your browser, with the same technology it uses to display them. There is no upload, no server queue and no account, so there is also no waiting for a large upload to finish.

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