How to Compress Images for the Web Without Visible Quality Loss
The best web-image optimisation combines right-sized pixels with a suitable format and a quality setting tested on real content.
Read guide →Batch Compress Images
Apply one output-format and quality workflow to multiple images while keeping each result as a separate file.
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Reviewed 2026-07-10
About Batch Compress Images
Batch compression is useful when a group of images needs consistent handling. Each file is decoded, re-encoded, and reported independently, so one failed image does not erase completed results.
The batch runs in the browser rather than on an upload server. Files and previews remain allocated while they are listed, so smaller batches are more reliable on phones or devices with limited memory.
Supported formats
- JPEG
- PNG
- WebP
- AVIF
How to use it
- Build the batch. Add the images you want to process and remove any file that should use different settings.
- Choose shared settings. Select keep-original, JPEG, PNG, WebP, or AVIF and set the quality used for lossy outputs.
- Process and sample. Run the batch, inspect several difficult images, and download completed results individually or with the All action.
Useful for
- Prepare a set of product photographs with one consistent JPEG quality.
- Convert a folder-sized selection of web images to WebP or AVIF.
- Re-encode several share copies without sending the source files to a processing service.
Limitations
- The All action triggers separate file downloads; it does not package the results into a ZIP archive.
- One quality setting may not suit every image, especially a mixture of photographs, screenshots, transparency, and line art.
- The tool does not resize dimensions. Large batches can pressure browser memory even though files are processed one at a time.
Questions and answers
What does “keep original format” mean?
JPEG, PNG, WebP, and AVIF inputs are re-encoded to the same format. Other decodable inputs fall back to JPEG because their original formats are not available through this compression output control.
Can I use a different quality for each image?
The runner stores controls per image for non-combine operations, so you can select a file and adjust it independently before processing. Test the workflow if strict batch consistency is required.
Why should I test a few images first?
Compression responds to content. Fine texture, gradients, text, and transparency can reveal different problems at the same setting.
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