Proton Docs is a secure, end-to-end-encrypted word processor, but it cannot do many things that Google Docs or Microsoft Word users take for granted: it lacks offline mode, add-ons, real-time collaboration with multiple cursors, and advanced formatting controls. If you are considering switching to Proton Docs for privacy, you need to know exactly what it can’t do before you commit.
Background: What Proton Docs Is and Isn’t
Proton Docs is part of Proton’s suite of privacy-focused apps (Proton Mail, Proton Calendar, Proton Drive). It launched in 2024 as a web-based document editor with end-to-end encryption (E2EE). That means your document content is encrypted on your device before it reaches Proton’s servers, so Proton itself cannot read it. The trade-off is that many features requiring server-side processing—like grammar checking, voice typing, or AI-powered suggestions—simply don’t work because the server can’t see your text.
Proton Docs is not a full replacement for Word or Google Docs. It is a minimal, secure editor designed for writing and light formatting. It runs only in a web browser; there is no desktop app for Windows, macOS, or Linux, and no mobile app for iOS or Android (though the mobile browser version is usable).
What Proton Docs Can’t Do: The Core Limitations
- No offline mode: You can only edit documents while connected to the internet. There is no local cache or offline sync.
- No real-time collaboration: You cannot share a document for simultaneous editing with multiple people. Proton Docs supports sharing for viewing or commenting, but only one person can edit at a time, and there are no live cursors or presence indicators.
- No add-ons or extensions: Unlike Google Workspace or Microsoft 365, there is no marketplace for third-party tools. You cannot install a grammar checker like Grammarly, a citation manager, or a PDF converter.
- No advanced formatting: You cannot insert headers/footers, page numbers, footnotes, tables of contents, or columns. There is no mail merge, no track changes, and no version history (only a basic “last edited” timestamp).
- No voice typing or dictation: Speech-to-text requires server-side processing, which conflicts with E2EE.
- No AI features: No built-in AI writing assistance, summarization, or translation. Any AI tool would need to read your document, breaking encryption.
- No import of complex formats: You can import .docx files, but complex layouts, comments, and tracked changes are often lost. Export is limited to .docx and .txt (no PDF export directly from the editor).
How Proton Docs Works (and Why It Can’t Do More)
Proton Docs uses the same encryption model as Proton Drive. When you create a document, your browser generates a key that encrypts the content before it is uploaded. The key is stored on Proton’s servers, but it is itself encrypted with your password. Proton’s servers only see encrypted blobs of text; they cannot parse, index, or process your document. This is why search within a document is limited to your browser’s find function (Ctrl+F) and why there is no server-side spell check.
The editor itself is based on the open-source TipTap editor, which provides a clean, minimalist interface. You get basic text formatting: bold, italic, underline, strikethrough, headings (up to H3), bulleted and numbered lists, block quotes, and hyperlinks. You can also insert images, but they are encrypted and stored in the document file. That’s about it.
Because processing happens on your device, anything that requires server-side computation—like grammar suggestions, document analysis, or converting to PDF—would require sending your plain text to a server, which Proton avoids by design.
Common Problems and Workarounds
The most common complaint is the lack of PDF export. To get a PDF, you must export as .docx and then convert it using another tool (e.g., Google Docs, LibreOffice, or an online converter). This is clunky and, if you’re privacy-conscious, you may not want to upload your document to a third-party service.
Another frequent issue is that sharing a document for editing requires the recipient to have a Proton account. You can share a link with “view only” access to anyone, but for editing, the other person must log in with Proton credentials. There is no anonymous editing link.
If you need to collaborate in real time, the workaround is to use a different tool (like Google Docs) for the collaborative phase and then import the final version into Proton Docs for secure storage. Alternatively, you can use Proton Docs for solo writing and then share the .docx file via Proton Drive for others to download and edit locally.
Comparison: Proton Docs vs. Google Docs vs. Microsoft Word
| Feature | Proton Docs | Google Docs | Microsoft Word |
|---|---|---|---|
| End-to-end encryption | Yes | No (at rest, but not E2EE) | No (unless using RMS) |
| Offline editing | No | Yes (with Chrome extension) | Yes (desktop app) |
| Real-time collaboration | No | Yes | Yes (with OneDrive) |
| Add-ons/extensions | No | Yes | Yes (plugins) |
| Version history | No | Yes | Yes |
| Track changes | No | Yes (limited) | Yes |
| PDF export | No | Yes | Yes |
| Voice typing | No | Yes | Yes |
The main reason to choose Proton Docs is privacy. If you write sensitive content (legal drafts, journal entries, business plans), the encryption is a strong advantage. But if you need collaboration or advanced features, you’ll be frustrated.
Cost and Availability
Proton Docs is free with a Proton account. It is included in Proton Drive, which offers 5 GB of free storage. For more storage, you can subscribe to Proton paid plans (starting at a monthly fee, but prices vary). The free tier is sufficient for light document use.
Availability: Proton Docs works in any modern browser (Chrome, Firefox, Safari, Edge). There is no desktop app, but you can create a “web app” shortcut in Chrome or Edge to make it feel like one. Mobile browsers work, but the interface is not optimized for small screens, so editing on a phone is possible but not pleasant.
Security and Privacy Considerations
The main security benefit is E2EE: Proton cannot read your documents, even if compelled by a court. The encryption keys are derived from your password, so if you forget your password, you cannot recover the document—there is no password reset for encrypted data. Proton offers a recovery method (a recovery phrase) but you must set it up in advance.
Be aware that metadata (file name, size, modification date) is not encrypted. Also, if you share a document via link, the link itself is encrypted, but anyone with the link can view the document if you set it to “anyone with the link.”
One misconception: Proton Docs is not a zero-knowledge service in the absolute sense—Proton knows your IP address and account details, but not the content. Also, the encryption is only as strong as your password; use a strong, unique password and enable two-factor authentication.
Frequently Asked Questions
Can I use Proton Docs offline?
No. Proton Docs requires an internet connection to load the editor and to save changes. There is no offline cache or local storage of your documents. If you need offline editing, you’ll have to use a different tool and then upload the file to Proton Drive.
Can I collaborate with others in real time?
No. You can share a document for viewing or commenting, but only one person can edit at a time. There is no live cursor or presence indicator. For real-time collaboration, you’d need to use Google Docs or Microsoft Word Online.
Can I export to PDF?
Not directly. Proton Docs only exports to .docx or .txt. To get a PDF, you must download the .docx and convert it using another program (e.g., LibreOffice, Google Docs, or an online converter).
Does Proton Docs have a mobile app?
No. There is no dedicated mobile app for Proton Docs. You can access it through a mobile browser, but the interface is not optimized for touch, so editing on a phone is cumbersome.
Can I import my Google Docs or Word documents?
You can import .docx files into Proton Docs, but the import may lose complex formatting, comments, and tracked changes. You cannot directly import Google Docs files; you’d need to export them as .docx first.
Is Proton Docs really encrypted end-to-end?
Yes. Documents are encrypted on your device before being uploaded to Proton’s servers. Proton cannot read the content. However, metadata like file name and size is visible to Proton. Also, if you share a link, anyone with that link can view the document (if you set it to “anyone with the link”).
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