To delete unused language files on a Mac, use the free Monolingual utility to strip out localizations you'll never use from your installed apps and macOS itself — but never remove English, even if it isn't your primary language. Every app on a Mac ships with dozens of language localizations, and on a small 128 GB or 256 GB drive, clearing them frees real, measurable space.
TL;DR
- Use Monolingual to remove unused app and system localizations in one pass.
- Typical recovery is roughly 1-3 GB on a fully used Mac.
- Always leave English unchecked — apps fall back to it and may crash without it.
- This is a one-time cleanup, not a recurring chore; rerun only after major macOS upgrades.
- It frees space but won't fix a drive that's full of large files, photos, or caches.
Why do language files pile up on a Mac?
Language files (localizations) are the menus, labels, and resource strings that let an app display in different languages. Major apps such as Microsoft Word, Photoshop, Chrome, and Slack each include menus and resources for 30 to 40 languages, and macOS itself ships a long list of system dictionaries and localized resources. For anyone who only uses one or two languages, the rest are pure waste. Across a fully used Mac, those unused localizations commonly add up to between 1 and 3 GB — modest on a large drive, but meaningful when you're squeezed onto 128 or 256 GB.
How do I delete language files with Monolingual?
Monolingual is a free, open-source tool that scans installed apps and removes the localization bundles you don't need:
- Download Monolingual from its official site.
- Open it — you'll see a long list of languages.
- Check every language you do not use.
- Leave your primary language unchecked.
- Leave English unchecked even if it isn't your primary language.
- Click Remove and let it scan each app's package contents.
Monolingual works through every installed app's package and strips the unused localization bundles, then does the same for macOS system resources. The first run is the big one; afterward there's little left to remove.
How much Mac storage can deleting language files free?
The payoff depends on how many apps you have and how many languages each bundles. The table below gives realistic expectations:
| Source | Languages bundled | Typical reclaimable space |
|---|---|---|
| Large apps (Office, Adobe) | 30-40 each | A few hundred MB combined |
| Browsers and chat apps | 30+ each | Tens to low hundreds of MB |
| macOS system resources | Dozens | A few hundred MB |
| Total on a full Mac | — | ~1-3 GB |
This is real space, but it's a one-time win. It won't keep growing back the way caches do, so treat it as a setup-time cleanup rather than routine maintenance.
Why should I keep English language files?
You should always keep English because macOS and most third-party apps fall back to English strings when a requested localization is missing or fails to load. Remove English and you risk apps that won't launch at all — the typical failure mode is an app crashing on startup because the resources it expects aren't there. This is the one safety rule that matters most: deselect English in Monolingual and leave it installed, regardless of which language you actually use day to day.
Is it safe to delete Mac language files?
Deleting unused localizations is safe and reversible in practice: the files are only display resources, and reinstalling an app restores any language you later need. The two cautions are to keep English (apps depend on the fallback) and to keep your own primary language. Run Monolingual once when you first set up a new Mac, and again after every few major macOS upgrades, since system updates can repopulate localizations. Daily or weekly cleanup isn't needed — there's simply nothing new to remove that often.
FAQ
Is it safe to delete language files on a Mac?
Yes, as long as you keep English and your own primary language. Localization files are display-only resources, and a removed language can always be restored by reinstalling the app, so the cleanup carries little risk when done carefully.
How much space do unused Mac language files take?
On a fully used Mac, unused localizations typically total 1-3 GB across apps and system resources. The exact amount depends on how many large multilingual apps you have installed.
Why shouldn't I delete English language files?
macOS and most apps fall back to English strings when another localization is missing. Removing English can stop apps from launching, so it should always be left installed even if English isn't your main language.
How often should I run Monolingual?
Run it once when setting up a new Mac and again after major macOS upgrades, which can reintroduce localizations. There's no benefit to running it frequently, since unused language files don't regenerate the way caches do.
If your Mac is still tight on space after this, the bigger culprit is usually hidden system files — see how Mac System Data builds up and how to clean it safely. For a decision-first approach to a full drive, read what should I delete first when storage is full and does freeing up space make your device faster. To keep your phone's storage in check too, our free up phone storage solutions hub lays out a full plan, and Cleanor clears large files and duplicates directly on the device, locally, with nothing uploaded.