Per-image compression for macOS
On-device image compression for macOS. MediaSlim tunes each image separately for smaller files with a steadier quality floor. No uploads, originals stay untouched.
Drag images to start
Compression starts automatically · originals kept
Compress, or convert between formats
Compress
A per-image quality loop finds the smallest file that still looks right — not one fixed setting applied to everything.
Convert
Switch between the formats you actually use. Animated files are skipped entirely — never silently flattened to one frame.
A steadier quality floor, image by image
Default output is essentially level with TinyPNG in total size (+0.30%); its lowest S2 is 74.47, versus 68.64 for TinyPNG.
Risky mixed content automatically gets a higher quality floor; median S2 is 0.55 higher, with 7 of 8 images no lower than TinyPNG.
Nothing leaves your Mac
Compression runs entirely on your machine — no account, no upload, works offline.
Fully local
Every image is processed on your Mac — image data never leaves the device.
Originals kept
Output is written separately. Your original files are never overwritten.
Sensitive assets stay private
Design files, internal screenshots and client assets never touch a third-party server.
Try MediaSlim on your own images
Compression, format conversion, and Finder integration are all free. No account needed — install and start using MediaSlim right away.