MediaSlimNeed help? Start here
Ran into a bug, unexpected output, or have a feature idea? Here is how to reach the developer.
Report a problem
If you encounter a crash, incorrect output, or unexpected behavior, please open an issue on GitHub with the following:
- macOS version and Mac model (Apple silicon)
- MediaSlim version (menu bar → MediaSlim → About)
- Steps to reproduce, expected result, and actual result
- A sample file that triggers the issue, if possible
Common questions
Which formats are supported?
Compression: JPEG and PNG images, plus MP4, MOV, M4V, and MKV videos — video output stays in the original container as HEVC, keeping audio tracks, subtitles, and chapters. Format conversion: convert between JPEG, PNG, HEIC, WebP, and AVIF, or import camera RAW files (DNG, NEF, ARW, CR2/CR3, and more) directly. Animated images (GIF, animated PNG) and unsupported formats (such as HDR or 10-bit video) are skipped rather than silently altered.
Does it work offline?
Yes. Image and video processing runs entirely on your Mac and does not need a network connection. The app uses Firebase to track crashes and identify frequently used features so we can improve the product. There is also an optional update check (Sparkle). See the Privacy Policy for details.
Will it overwrite my originals?
Never. Compressed files go to a separate folder. Originals stay untouched.
What are the system requirements?
macOS 15 or later. Apple silicon Mac (arm64) only; Intel Macs are not supported.
Are all features free?
Yes. Compression, format conversion, and Finder integration are all free and ready to use after installation.
Do I need an account?
No. Download and install MediaSlim, then drop in your images or videos to get started.
Feature requests
Ideas are welcome — open a GitHub issue or send an email. No promises on timelines, but every suggestion gets read.
Changelog
Release notes are synchronized from the signed MediaSlim update feed.