System requirements

Omitly is a desktop app. It runs on your own machine and needs very little.

What you need

• macOS: a Mac running macOS 11 Big Sur or newer. There are two builds — Apple silicon and Intel — so pick whichever matches your machine (Apple menu → About This Mac shows which chip you have). One caveat on Apple silicon while we correct it: opening password-protected PDFs currently needs macOS 26 or newer. Everything else — opening, redacting, saving and verifying ordinary PDFs — works from macOS 11 up, and the Intel build is not affected by that caveat.
• Windows: a currently supported 64-bit version of Windows.
• Enough free disk space for the app and the documents you’re working on.

What you don’t need

• No account. There’s nothing to sign up for or sign in to.
• No internet connection to redact. Opening, redacting, saving and verifying all work offline. See Where does your PDF go?
• No server or admin infrastructure for a single install.

The app can reach the network for its own updates and for in-app support, but your documents are never part of that traffic.