About this tool
Bulk Image Compressor processes up to 20 images together, converts them to space-efficient JPEG files and reports the before-and-after size for every result. Images stay in the browser and are never uploaded.
How to use
- 1Choose up to 20 images.
- 2Set JPEG quality.
- 3Process and download each result.
Benefits
- Batch workflow.
- Per-file size comparison.
- Local processing.
Compress a batch with one quality rule, then inspect exceptions
Practical example
A folder of article photos may compress well at one setting, while screenshots with small text show artifacts sooner. Sample the largest photo and the finest text before accepting the batch.
Interpreting the result
Compare total bytes before and after, inspect representative files at their real display size and keep originals. Separate photographs, illustrations and screenshots when they need different formats or quality.
Limits and common mistakes
A single setting cannot optimize every visual. Browser memory limits can affect large batches, and lossy re-encoding can remove metadata or compound artifacts.
Frequently asked questions
Why is the output JPEG?+
JPEG provides predictable compression; transparent pixels receive a white background.
Are files uploaded?+
No.