Best Private and Encrypted Note Taking Apps
Your notes are some of the most sensitive data you own. These private note taking apps keep them readable only to you — offline-first or zero-knowledge by design.
Most note apps can read your notes. Not in the casual sense — literally, technically, they store your note bodies in plaintext on their servers, and in many cases use them for advertising. If that bothers you, private note taking apps encrypt your notes so only you can read them. When we ranked the best note taking extensions for chrome, privacy was a core criterion — here are the options that take it seriously.
The two privacy models
Zero-knowledge sync. Your notes are encrypted on your device before they’re uploaded, and the server stores only ciphertext. The provider couldn’t read your notes even if they wanted to. Standard Notes, Notesnook, and Best Note (Pro) work this way.
Local-first storage. Your notes never leave your device at all. No server, no ciphertext, no account — just local storage and local search. Best Note (free) and Obsidian work this way.
Both models beat the mainstream alternative: plaintext in the cloud, readable by the provider and anyone with access to their servers.
The private note taking apps worth considering
Best Note is local-first by default — notes live on your device and free users never contact a server. Pro sync encrypts note bodies in the browser with AES-256-GCM before upload; the server only ever sees ciphertext, with keys derived on-device via Argon2id. It’s the only option that combines rich web clipping with a true local-first free tier.
Standard Notes is the zero-knowledge veteran: fully encrypted sync on every plan, with a free basic tier. If encryption above all else is your priority, it’s the safe choice.
Notesnook is a newer zero-knowledge option with a cleaner free tier than Standard Notes and E2EE across devices.
Obsidian keeps notes as local markdown files; encryption happens through its optional sync or third-party plugins. If you own your files, privacy is a feature of the format.
Proton Drive’s Notes / Tuta / other privacy suites offer encrypted notes as part of larger privacy products — fine, but the browser extension experience is usually thin.
Red flags to check
- “Encryption” without zero-knowledge claims — many apps encrypt data in transit (HTTPS) and call it encryption. That’s not privacy; anyone with server access can read the plaintext.
- Free apps without a paid plan — if notes are free forever with no business model, your notes are likely the product.
- No export — if you can’t export, you don’t own your notes, encrypted or not.
The encryption details that matter
End-to-end encryption is a promise, and the details determine whether it holds: which algorithm (AES-256-GCM is the standard), how keys are derived (Argon2id), and what happens if you lose your password (recovery words shown once, or lost forever). A good provider documents all three.
Our pick
For private note taking in Chrome, Best Note’s model is the most practical: the free tier is local-first with zero server contact — you don’t have to trust anyone, because nothing leaves your device. When you do want multi-device sync, Pro encrypts before upload with AES-256-GCM. If you want zero-knowledge sync baked into everything, Standard Notes is the proven alternative. Either way, stop storing notes in apps that read them.