Compress JPG, PNG, or WebP images online without visible quality loss. LunaFile preserves your original format — PNG stays PNG (with alpha intact), WebP stays WebP — so your images keep their characteristics. JPEGs use mozjpeg with progressive encoding for the smallest possible files.
How to use Compress Image
- 1
Drop your image
Up to 20 MB per image. JPG, PNG, and WebP are all supported.
- 2
Sharp re-encodes it
Smart compression at quality 80 — visually identical for most use cases.
- 3
Download the result
Same format as you uploaded. PNG transparency is preserved.
Common questions
Will my PNG transparency be preserved?+
Yes — PNGs stay PNG with full alpha channel intact. We never silently convert to JPEG.
How much smaller will my image be?+
JPEGs typically 30–60% smaller, PNGs 40–70%, WebP 15–30% — depends on the original.
Will it look worse?+
Not noticeably. Quality 80 is the sweet spot used by most professional pipelines.
Can I compress multiple images?+
One at a time today. Batch upload is on the roadmap.