☁️ CouchDB Sync for Obsidian

[!IMPORTANT] Beta. It works well and is genuinely useful for everyday syncing, but it's still maturing and behaviour may change between versions. A little caution is wise: as with any sync tool, please keep backups of important vaults. Bug reports and feedback are very welcome — thank you for helping shape it. 🙏

Keep the same notes on every device — on your own server, readable only by you.

Write a note on your laptop and it appears on your phone. Edit it on the train and your desktop has it when you get home. Nothing goes through a company's cloud: your notes travel to a server you choose, and they are locked before they leave your device, so whoever runs that server sees nothing but scrambled data.

There are no pop-ups to click away and no "rebuild your database" rituals. One switch says whether this vault syncs, and a panel shows you the honest truth about every single file.

🌱 New to syncing? Start here

Three ideas cover almost everything:

The short version of a normal day: you write notes and never think about this plugin again. It is running in the background, and the status bar at the bottom of Obsidian quietly tells you how things are going.

You need a server for this. That is the one piece of setup this plugin cannot do for you. Getting a server walks through the options, from "pay someone else to run it" to "run it yourself in one command".

What you get

🔐 Everything is encrypted before it leaves

Encryption is on by default and covers more than most sync tools: not only what you wrote, but also your file names, folder structure, file sizes and timestamps. Someone who steals the whole server database gets a pile of numbered blobs — no titles, no folder names, no hints.

📊 A status panel that tells you the truth

See all three places your notes live at a glance — this device, the on-device local cache, and the server — with the exact delta between each pair. When they match it says so; when the server can't be reached it says that (e.g. a login error) instead of pretending everything is fine.

Open it from the status bar and see how many files are in sync (1,284 / 1,284 · 100%) plus a folder tree of every file, colour-coded:

Folders show the most urgent state inside them, so a green folder really means "everything in here is fine". Files being transferred right now shimmer and show their progress.

The same panel on mobile — every store, every file, and the same per-file actions (a ⋯ menu on each row: upload, download, resolve, view history, and more).

🕰️ Every version, kept

The plugin keeps a history of each note (the last 50 versions). Open it, compare any two versions side by side, and restore an older one on all devices with one click. Restoring is itself just another version, so you can always undo the undo.

⚖️ Conflicts without pop-ups

If two devices edit the same note before they can talk to each other, the plugin resolves it by a rule you pick once — either the newest edit wins, or one device you nominate always wins. It never interrupts you to ask. And because every version is kept, the other version is never actually gone.

📦 Big files, small memory

Photos, PDFs, audio, video — files are cut into 1 MB pieces and only the changed pieces are uploaded. Identical pieces are stored once, even across different files. A 600 MB file syncs without Obsidian ever holding it in memory.

🛟 Hard to break

Sync is one switch, and it is honest: on means running, off means nothing touches the network. If Obsidian ever shuts down uncleanly mid-sync, the plugin starts up switched off and tells you why, so you can never land in a loop that crashes on every launch. "Wipe local cache" only ever touches this device — the server is never harmed by anything you can press here.

🚀 Getting started

🧩 Step 1: Get a server

Pick whichever fits you. All you need at the end are four things: a web address, a database name, a username, and a password.

Option A — let someone host it for you (easiest). Search for "CouchDB hosting"; providers like IBM Cloudant or a small managed CouchDB plan give you a URL and login without any admin work. Make sure the address starts with https://.

Option B — run it yourself. If you have a home server, a NAS (Synology and Unraid both offer CouchDB), or a small cloud VM, CouchDB installs in minutes. If you have Docker, a test server is literally one command from this repository:

docker compose -f docker-compose.couchdb.yml up -d

That gives you http://127.0.0.1:5984 with user admin and password password — perfect for trying things out on one computer. Change that password and use https:// before you sync anything real over the internet.

Option C — keep your server off the open internet (Cloudflare Tunnel). If you run CouchDB at home but would rather not forward a port or hand out your IP address, a Cloudflare Tunnel puts a public hostname in front of it. cloudflared runs next to CouchDB and dials out, so your router needs no inbound rule, and the certificate is handled for you:

cloudflared tunnel create obsidian
cloudflared tunnel route dns obsidian couch.example.com
cloudflared tunnel run --url http://127.0.0.1:5984 obsidian

Then enter https://couch.example.com as the web address in Step 2. There is no setting for this in the plugin — the tunnel is invisible to it.

⚠️ A tunnel hides where your server is; it does not lock the door. Anyone who knows the hostname reaches your CouchDB, so require_valid_user = true below and a strong password are what actually protect it.

Do not put a Cloudflare Access policy in front of the hostname: Access answers unauthenticated requests with a login page rather than your data, and the plugin cannot present a service token yet. Sync would stop working.

One-time server setting. However you got your server, open its configuration and add this. It lets Obsidian talk to it and allows large files:

[chttpd]
enable_cors = true
require_valid_user = true
max_http_request_size = 4294967296
[cors]
origins = app://obsidian.md,capacitor://localhost
credentials = true

Finally, create an empty database (the default name this plugin expects is obsidian).

🔌 Step 2: Connect Obsidian

Open Settings → CouchDB Sync and fill in the four things from Step 1:

1. Server URL — the full address, e.g. https://couch.example.com:6984
2. Database name — e.g. obsidian
3. Username and Password
4. Press Test connection. Green means you're good.

🔑 Step 3: Choose your passphrase

Type a Passphrase. Your notes are always end-to-end encrypted, so this is required — invent something long that you can write down; a short sentence works well.

⚠️ Write it down now. The passphrase never reaches the server, which is the whole point — but it also means nobody can reset it for you. And it must be typed identically on every device, or they will not understand each other's notes.

▶️ Step 4: Let it run

Make sure the switch in the status card says Sync on. That's it — your notes start uploading, and sync restarts by itself every time you open Obsidian.

📱 Step 5: Add your next device

Install the plugin there, enter the same server details and the same passphrase, switch it on, and wait. Your vault downloads itself. If you use the master device wins rule, turn on This device is the master on exactly one device — usually your main computer.

🎛️ Using it day to day

The status bar (bottom edge of Obsidian) is two controls in one:

• the icon switches sync on and off
• the label (CouchDB 63%) opens the full status panel in the sidebar

The status panel is the same panel embedded in the settings tab — same tree, same buttons. From it you can:

• press Force sync to run a full pass right now
• expand the tree and hover any file for a ⋯ menu with only the actions that make sense for it: download / overwrite local, upload / overwrite server, sync once, delete on this device, delete everywhere, remove from index
• click 🕘 to browse, compare and restore that file's versions
• apply any of those to a whole folder at once

🧩 Requirements

• Obsidian 1.7.2 or later
• A CouchDB server you can reach (Step 1)
• Tested and validated on desktop. Mobile is supported by design (the plugin uses Obsidian's own networking, so it works without special server tweaks) but has not yet been through a full mobile test round.

⌨️ Commands

Available from Obsidian's command palette (Ctrl/Cmd + P).

⚙️ Settings

| Reset the server from this device | — | Start the server over: delete everything on it and re-upload this device's files. Checks the server first and names the files that exist only there — the ones the reset destroys — before asking. Also how you change your passphrase (below) |

🔁 Changing your passphrase

Your passphrase is not a login you can just replace — it is the key everything on the server was locked with, and it decides the names your files are filed under. Change it and the server's existing contents become unreadable to you. So the passphrase is not changed so much as the server is rebuilt around the new one.

On the device whose files you trust:

1. Switch sync off (the toggle in the status panel). Do this first — the passphrase field saves on every keystroke, and a sync running in the background would upload files locked with a half-typed passphrase.
2. Enter the new passphrase under Connection & encryption.
3. Press Reset server under Actions, and confirm. It empties the server, discards this device's cache and re-uploads every file under the new passphrase. Sync turns itself back on. Expect an extra dialog here saying the server's files cannot be read with this passphrase — that is exactly right: the new key cannot open the old contents, so the plugin cannot list what the reset will delete. Continue.
4. Wait until the counters read the same number three times over — e.g. 112 / 112 local · 112 / 112 on server.

The new passphrase has to be entered on every other device by hand. On each one: switch sync off, type in the same passphrase, press Wipe local cache, and switch sync back on. It downloads the vault afresh.

⚠️ The version history does not survive this. The reset deletes everything on the server, past versions included, and files that existed only on the server are gone too — only the device you reset from is preserved. Copy anything you still need off the other devices first.

A device you forget will keep the old passphrase, fail to read anything, and can push its old copy back. Work through all of them.

🔒 What the plugin does with your data

Locked before it leaves your device — your note text, your file and folder names, file sizes, creation and modification dates, and which pieces make up which file. All of it is encrypted with AES-256-GCM, using a key derived from your passphrase. The server stores it and can read none of it.

Still visible to whoever runs the server — that data exists and roughly how much of it there is, how many files and versions there are (approximately), which pieces repeat, and when versions were created. Nothing that reveals a title, a folder, or a word you wrote.

On this device — the local cache keeps some information in the clear (file paths, sizes, fingerprints) so the status panel can work offline. Use Wipe local cache any time you want that removed; it only ever touches this device.

Your credentials — your server password and your encryption passphrase are stored encrypted in the plugin's own data.json inside your vault; that file holds no readable password. What unlocks them stays out of the vault, so copying, backing up or file-syncing the vault does not carry the key along. Two choices, under Settings → Credential storage:

• This device (default) — a random key generated on first use and kept in this device's local storage. No prompt, ever. A vault copied to another device therefore arrives without usable credentials: enter them once there.
• Ask a passphrase at every launch — the key is a passphrase you type once per session and that is stored nowhere at all.

Either way the credentials never leave your device and are never sent to the server. If you upgraded from an older version, the plaintext is replaced the first time the settings are saved — but older backups of data.json still contain it.

Where things go — only to the server you configured yourself. Nothing is sent anywhere else, ever. With sync switched off, the plugin makes no network requests at all.

☕ Support

CouchDB Sync is free and open source, built and maintained in my spare time. If it keeps your notes together across your devices, you can support continued development with a coffee — it's genuinely appreciated.

🛠️ Development

npm install
npm run dev      # watch build -> main.js
npm run build    # type-check + production bundle
npm test         # unit tests

Copy manifest.json, main.js and styles.css into <vault>/.obsidian/plugins/couchdb-sync/.

License

MIT