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Image & Data Auxiliary
Astronomy Image Compressor
Front-end JPEG compression for large starry-sky photos.
Try the tool
Tool principle
Uses the browser's native canvas encoder to re-encode images at a chosen quality — all processing stays on your device.
Data source: Native browser Canvas API.
User guide
- 1Select a photograph from your device.
- 2Choose a quality (0.85 is a good default).
- 3Compress and download the smaller file.
Frequently asked questions
Do you upload my image?＋
No — the entire pipeline runs in your browser.