Air Sync

Like air, sync should simply be there.

Open Obsidian on any device and keep going.

Air Sync keeps your vault in step across desktop and mobile without making sync something you have to start, watch, or manage.

Your notes stay in your own cloud storage:

• Google Drive
• OneDrive
• Dropbox

No sync server to run. Almost nothing to configure. No need to think about uploads, downloads, or routine conflicts.

What you get

Simple to set up

Connect your cloud storage, choose a folder, and you're ready.

Works only when needed

Air Sync reacts when something changes instead of repeatedly scanning your vault on a timer.

After the initial scan, it processes only what changed — reducing unnecessary work, data transfer, and battery use.

Fast as your vault grows

Everyday sync stays lightweight because Air Sync does not repeatedly scan or transfer your entire vault.

Safe through conflicts and interruptions

When the same note changes on multiple devices, Air Sync merges the edits when possible and preserves them conservatively when it cannot.

If Obsidian closes, your phone locks, or the connection drops during sync, completed work is preserved and the next sync continues safely.

Getting started

1. Create an Obsidian vault in local storage.
2. Open Settings → Air Sync.
3. Choose Google Drive, OneDrive, or Dropbox.
4. Click Connect.
5. Choose the cloud folder used for your vault.

That's it.

Your vault and your devices

• Keep your vault in local storage. Create your Obsidian vault on your device — not inside a folder that another cloud drive already syncs (iCloud Drive, or the Dropbox / OneDrive / Google Drive desktop apps). Air Sync copies your notes to the cloud for you.
• Don't open the cloud folder as a vault. The folder Air Sync creates in your cloud storage is a managed mirror — opening it directly in Obsidian as a vault is not supported. Keep working in your local vault; Air Sync keeps the cloud copy in step.
• Google Drive: don't add files on the cloud side — work only in your local vault. The built-in Google Drive connection can see only the files Air Sync itself uploaded. Files added to the cloud folder any other way are invisible to Air Sync and never sync. That covers drive.google.com, the Google Drive apps, and moving files in from elsewhere in your Drive. It also includes files already in an existing folder you pick. Put files into your local vault instead, and Air Sync uploads them. If you need files added on the cloud side to sync, connect through a custom OAuth app with the full Drive scope (https://www.googleapis.com/auth/drive).
• Let Air Sync be the only sync tool for a vault. Two sync mechanisms managing the same files at once is a common cause of conflicts.
• Use the same folder on every device. During setup you choose which cloud folder to sync into — pick the same folder on each device so they share one set of notes.
• Existing files are handled conservatively. A first sync merges both sides — a file on only one side is copied to the other, never deleted — so a new device or an already-populated folder just brings both sets together. A file is removed only when one that was already in sync gets deleted, and even then it goes to the trash on both sides (recoverable). Clashing edits keep both. Details: deletion safety, conflict strategies.

Conflict resolution strategies

Strategy	Behavior
Auto merge (recommended)	Attempts 3-way merge for text files using the last-synced content as the base. If merge is not possible (binary file, no base content, or merge failure), falls back to keeping the newer version by mtime — which replaces the older one. Only when the two can't be ordered (equal or unknown mtime, differing content) does it keep both as a duplicate.
Prefer local	When Air Sync can prove that the same previously synced file was edited independently on both sides, keeps the local version at the original path. If that proof is unavailable—including on a first sync or after sync state was cleared—it preserves both like Duplicate. An edit that clashes with a deletion is also preserved.
Duplicate	When both sides exist, keeps the local version at its original path and saves the remote version alongside it as a .conflict file. When an edit clashes with a deletion, the surviving version is restored — the deletion never wins.

An edit that clashes with a deletion never loses the edit under any strategy. The difference is edit-vs-edit: Auto merge may keep only the newer version, Duplicate always preserves both, and Prefer local selects local only for a proven conflict with a common sync baseline. For the complete decision logic — merge eligibility, mtime tie-breaks, and conflict-file naming — see docs/conflict-resolution.md.

Commands

Command	Description
Air Sync: Sync now	Run a sync manually

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Custom OAuth apps

Prefer your own cloud app over the built-in connection? Air Sync supports a custom app / custom OAuth backend for Google Drive, OneDrive, and Dropbox — you register the app with the provider and enter its identifiers in Air Sync. This is also the way to reach OneDrive work/school accounts.

See the custom app setup guide for what each backend needs and how it maps to Air Sync's settings. The guide links to each provider's official developer documentation for the registration steps themselves.

Note: Custom apps still use a scoped / App Folder connection, so access stays confined to the plugin's own folder. Tokens are stored in Obsidian's secret storage (accessible to other plugins); a broader scope you configure yourself may increase exposure.

Troubleshooting

• A file still looks out of sync after a sync has run (a note that won't update, or the two sides disagree, and repeated syncs don't fix it): Open Settings → Air Sync → Advanced and click Rescan. It re-checks your whole vault against your cloud storage from scratch — rather than only what changed since the last sync — comparing files by content, so it re-transfers only what genuinely differs and doesn't reset your existing sync state.
• Connected, but nothing syncs: Connecting only authorizes Air Sync — it doesn't sync yet. Make sure you've chosen a remote folder (the default folder or pick an existing folder); the first sync starts as soon as a folder is selected. On mobile, keep Obsidian open in the foreground while it runs.
• Files still don't sync after choosing a folder: Trigger a sync yourself with the Air Sync: Sync now command, or by clicking the cloud icon in the status bar. The status bar text (Synced / Syncing… / Sync error / Not connected) shows the current state. If it still doesn't run, restart the plugin (disable → enable in Community plugins settings) and try again.
• Seeing conflicts or .conflict files: These appear when the same file changed on two devices, or when another sync tool is also writing your vault (see Your vault and your devices). When reporting a conflict, please include the file path(s), which devices were involved and the order you edited them, your selected conflict strategy, and — if logging is enabled (Enable logging in settings, which writes to .airsync/ in your vault) — the diagnostic logs. That's what distinguishes a sync-engine issue from a multiple-writer setup.
• "Authorization failed" right after approving access: The token exchange needs a working connection immediately after you approve access. Check that the device is online, then click Connect and approve access again.
• The browser didn't return to Obsidian after approving access: You aren't connected yet, so there's nothing to disconnect — just click Connect in the plugin settings to start the flow again.
• "Authentication expired. Please reconnect in settings.": Your saved authorization is no longer valid (for example access was revoked, or a refresh token expired). Open Settings → Air Sync and reconnect.

Privacy & network use

Air Sync connects only to the cloud storage you choose, to sync your files:

• Google Drive — googleapis.com for sync; sign-in happens on accounts.google.com, and a small auth server (auth-airsync.takezo.dev) performs the sign-in token exchange.
• OneDrive — graph.microsoft.com for sync; sign-in happens on login.microsoftonline.com and returns directly to Obsidian (no relay or picker page — the folder is chosen in-app).
• Dropbox — api.dropboxapi.com / content.dropboxapi.com for sync; sign-in happens on dropbox.com and returns directly to Obsidian (no relay or picker page — the folder is chosen in-app).

Your vault data is sent only to your chosen storage provider — never to the auth, redirect, or picker pages.

Air Sync only ever sees the folders it created — never the rest of your Google Drive, OneDrive, or Dropbox. (On OneDrive it uses the App Folder, so it can only access its own folder.)

Disclaimer

This plugin is provided "as is", without warranty of any kind. The authors are not responsible for any loss or corruption of data, or any other damages arising from the use of this plugin. Use at your own risk. It is strongly recommended that you back up your vault before using this plugin.