How macOS actually works

Search and your privacy

Updated 2026-07-31 · 4 min read

Search touches every file you have. It is worth knowing what each tool does with that access.

Spotlight

The index is local — filenames, contents and metadata in .Spotlight-V100 on each volume, never transmitted. Searching your files is entirely on-device.

The exception is Siri Suggestions: when on, the typed query (not your files) is sent to Apple for web results, under a rotating identifier. Turn it off in System Settings → Siri & Spotlight and local search is fully offline.

The permission a search tool holds

A complete search tool needs Full Disk Access — it can read everything, including Mail, Messages and every document. That is a significant grant, appropriate for the function and worth giving deliberately.

Questions to ask of any such tool:

• Does it make network requests? Verify with Little Snitch or LuLu, which show outbound

connections per app — the only proof that does not rely on the vendor's word

• Does it phone home for licensing, and what does that send?
• Is there analytics or telemetry, and can it be disabled?
• Where is the index stored, and does it leave the Mac?

Third-party indexes

An index is a copy of your filenames (and possibly contents). Where it lives and whether it syncs matters. A local-only index is a file on your Mac with the same sensitivity as the originals; one that syncs to a vendor's cloud is a different risk entirely.

The offline test

The strongest privacy position for a file search tool is simple: it works with the network off. If searching and indexing never need connectivity, they cannot be exfiltrating anything, and you can verify that by pulling the cable.

For reference: Everywhere's index is one local file, searching and indexing never touch the network, and only licence activation contacts a server — once. Stating that plainly, rather than claiming the app never uses the network at all, is the honest version, and it is the standard worth holding every tool to.

The practical setup

Turn off Siri Suggestions for on-device Spotlight. For any third-party tool, confirm with a network monitor what it actually does, prefer local-only indexes, and value tools that work offline — because that property is verifiable and most claims are not.

Common questions

Does searching files on a Mac send data anywhere?

Local file search is on-device. Only Spotlight's Siri Suggestions sends the typed query to Apple, and only when enabled — turn it off for fully offline search.

How can I verify a search app is not sending my data?

A network monitor like Little Snitch or LuLu shows every outbound connection per app. A tool that works with the network off cannot be transmitting anything.