About The Bulk Image Compressor

The Bulk Image Compressor optimizes multiple raster images in one run. It is meant for batches of screenshots, product photos, documentation images, and web assets where reducing total file size is faster than compressing each image one at a time.

Compression and ZIP creation happen locally in your browser. A single output downloads as one image, while multiple outputs are bundled into a ZIP.

How to Compress Images in Bulk Online

1. Select one or more PNG, JPG, WEBP, GIF, or BMP images.
2. Open more options to choose output format, quality, and optional maximum dimensions.
3. Compress the images and wait for the browser to process the batch.
4. Download the result as one image file or a ZIP bundle.

Choosing Options Correctly

Output format:
Auto keeps practical smaller results. WEBP and JPEG are usually best for size; PNG is useful for lossless graphics or transparency.

Dimension limits:
Use max width and height to downscale oversized images while preserving their aspect ratio.

Common Use Cases

• Compressing a set of web images before upload.
• Reducing screenshots for tickets, documentation, or email attachments.
• Batch-converting images to WEBP, JPEG, or PNG.

Quick FAQ

How many files can I process?
Use a batch size your browser can comfortably handle. Very large images or many files may slow the page or run out of memory.

What happens if an output is larger?
Some already-optimized images can grow after re-encoding. Compare the result before replacing the original.

Why do multiple files download as ZIP?
A ZIP keeps batch outputs together and avoids triggering a separate download prompt for every image.

Are images uploaded?
No. The batch compression is designed to run locally in your browser.