Compress JPG
Re-encode JPG photos with MozJPEG at adjustable quality. Typically 30-60% smaller at quality 80, output stays standard JPG.
Drag files here or click to upload (multiple files supported)
Ctrl+V to paste from clipboard
How to compress JPG
- 1Upload your JPG file by dragging, clicking, or pasting.
- 2Adjust quality settings if needed.
- 3Click 'Convert Now' and wait for the conversion to complete.
- 4Download your converted JPG file.
About JPG compression
Oversized JPG files usually result from excessively high quality parameter settings during export, extra metadata load such as shooting location and camera parameters, and sub-optimal JPEG encoder implementations in image editors.
This tool uses a DCT-based standard JPEG encoder. It controls the compression level by adjusting quantization table parameters, and reduces file size according to your settings. Repeated compression accumulates compression artifacts and causes generational quality loss.
This compression is suitable for scenarios such as meeting web performance budget requirements and email attachment size limits. If an already highly compressed JPG file is compressed again with adjusted parameters, the file size may increase instead.
FAQ about Compress JPG
Will image quality change after compression?
Compression changes image quality according to the selected quality level. Lower levels produce smaller file sizes, with more obvious quality loss. This tool performs compression based on the Sharp engine, and the result is controllable.
When does compression not work?
Compressing an already highly compressed JPG file usually cannot reduce its size, and may even result in a larger file. Only JPG files that have not been processed with a high compression ratio can achieve significant size reduction.
What is the maximum file size limit?
This site only supports compressing one file at a time. The maximum size limit for a single file is 50MB. Files exceeding this limit cannot be processed.
Will my files be stored?
Files are uploaded to the server via HTTPS for compression. After processing is complete, the server immediately deletes both the source file and the output file, and does not store any files, so user privacy is protected.