--- og_image: "/images/guides/onlyoffice-vs-collabora-vs-cryptpad-2026.webp" title: "OnlyOffice vs Collabora vs CryptPad 2026: Self-Hosted Office Suites" description: "OnlyOffice, Collabora, and CryptPad compared for 2026: document fidelity, collaboration, encryption, and Nextcloud integration trade-offs." date: "2026-04-26" author: "OSSAlt Team" tags: ["onlyoffice", "collabora", "cryptpad", "office", "self-hosting", "nextcloud", "google-workspace-alternative"] featured_tool: "onlyoffice" --- ## TL;DR If your priority is **opening Microsoft Office files cleanly** and editing them in the browser, **OnlyOffice** is the strongest choice — its formats are OOXML-native. If you already run **LibreOffice on the desktop** and want the same engine on the server, **Collabora Online** is the natural fit. If you want **end-to-end encrypted documents** that even the server operator cannot read, **CryptPad** is the only option in the category. All three plug into Nextcloud; none of them is a perfect Office 365 clone, and each makes a different bet about what "office in the browser" means. ## Key Takeaways - **OnlyOffice** Document Server — AGPL-3.0; Microsoft format fidelity is the best in the category - **Collabora Online** — Mozilla Public License 2.0; LibreOffice engine running headless and rendered to the browser - **CryptPad** — AGPL-3.0; client-side end-to-end encryption; the documents themselves are opaque to the server - **All three** integrate with Nextcloud and ownCloud; OnlyOffice and Collabora also embed in Seafile, OpenProject, and Confluence - **Document fidelity (best to lossiest for .docx/.xlsx/.pptx)**: OnlyOffice → Collabora → CryptPad - **Encryption posture (most to least private)**: CryptPad → Collabora/OnlyOffice (server has plaintext) - **Best fit**: OnlyOffice for Office-heavy orgs; Collabora for ODF-first orgs; CryptPad for privacy-critical workflows --- ## Decision Table | Capability | OnlyOffice | Collabora Online | CryptPad | |------------|-----------|------------------|----------| | License | AGPL-3.0 | MPL-2.0 | AGPL-3.0 | | Native formats | OOXML (`.docx`, `.xlsx`, `.pptx`) | ODF (`.odt`, `.ods`, `.odp`) | Custom encrypted; export to ODF/OOXML/PDF | | Office format fidelity | ✅ Excellent | ✅ Good | ⚠️ Limited (export only) | | Real-time collaboration | ✅ | ✅ | ✅ | | Comments, suggestions, track changes | ✅ | ✅ | ⚠️ (basic in Pad/Doc) | | End-to-end encryption | ❌ | ❌ | ✅ | | Desktop apps | ✅ Linux/macOS/Win | ✅ (LibreOffice) | ❌ (PWA) | | Mobile apps | ✅ iOS / Android | ⚠️ via Nextcloud apps | ⚠️ PWA | | Nextcloud integration | ✅ Official | ✅ Official | ✅ via app | | Resource requirements | 4 GB RAM, 2 vCPU | 4 GB RAM, 2 vCPU | 1 GB RAM, 1 vCPU | | User license limits (free) | Unlimited | 20 connections / 10 docs (free) | None | | Self-hostable | ✅ | ✅ (Code is free, Online has limits) | ✅ | --- ## OnlyOffice: Microsoft Format Fidelity OnlyOffice is the suite that takes OOXML seriously. Its Document Server reads and writes `.docx`, `.xlsx`, and `.pptx` natively — not by converting to ODF and back. For organizations that exchange Office files with external partners, that one fact often decides the comparison. **Strengths** - Best-in-class fidelity for Microsoft formats — complex Word documents and spreadsheets survive a round-trip - Modern UI that genuinely resembles the Office 365 web apps - Real-time collaboration with comment threads, track changes, and review workflow - AGPL community edition has no user cap when self-hosted - First-party desktop apps (Linux/macOS/Windows) and mobile apps (iOS/Android) - Integrates with Nextcloud, ownCloud, Seafile, Confluence, Alfresco, OpenProject, and many more - Macros support via JavaScript-style scripting **Weaknesses** - Heavy install — Document Server wants 4 GB RAM and a current Linux - The Community Edition's connection limit was removed but enterprise support still gates some features (e.g., advanced auditing, SSO) - AGPL is friction for some enterprise deployments **Choose OnlyOffice if** your organization regularly exchanges Microsoft Office files and you need them to look right. --- ## Collabora Online: LibreOffice in the Browser Collabora Online is LibreOffice rendered server-side and streamed into a browser canvas. It's the official "online" project from the Collabora Productivity team and the most common choice in Nextcloud-centric deployments. **Strengths** - Same engine as LibreOffice — your power users on the desktop see exactly the same behavior in the browser - Excellent ODF support (it *is* the reference implementation) - MPL-2.0 license is friendlier than AGPL for many enterprises - "Collabora Online Development Edition" (CODE) is freely self-hostable; supported "Collabora Online" requires a contract for production use beyond small thresholds - Works with Nextcloud, ownCloud, EGroupware, and most major file collaboration suites - Real-time co-editing on Documents, Spreadsheets, and Presentations **Weaknesses** - Microsoft format fidelity is good but not as clean as OnlyOffice for complex `.docx`/`.xlsx` - The free CODE has documented limits (20 simultaneous connections / 10 documents) intended for evaluation - The UI shows its desktop heritage — denser than OnlyOffice's **Choose Collabora if** your standard format is ODF, you already love LibreOffice on the desktop, or you specifically want the MPL license posture. --- ## CryptPad: Encryption-First CryptPad is fundamentally different from the other two. It is a client-side end-to-end encrypted suite where the server stores only opaque ciphertext — even if your server is compromised, the documents are unreadable without the URL fragment that contains the key. **Strengths** - Genuine end-to-end encryption; the server (and the operator) cannot read documents - Includes Pad, Code, Sheet, Slide, Kanban, Whiteboard, Form, and a Drive — the last is also encrypted - Anonymous sharing via "magic links" — no account required to collaborate - Encrypted teams and shared folders for organizational use - Active development by XWiki SAS / OpenPaaS, EU-based, public funding from NLnet - Excellent for privacy-critical industries — journalism, legal, activism, healthcare consultations **Weaknesses** - Document fidelity is the weakest of the three; exports to OOXML/ODF are basic - Cannot do server-side rendering, OCR, or full-text search across encrypted content (by design) - Sheet is functional but not Excel-equivalent for complex spreadsheets - The mental model (URL = key) is unusual; users must understand that losing the URL means losing the document **Choose CryptPad if** confidentiality is non-negotiable and the office suite is for *human* communication rather than complex business documents. --- ## Nextcloud Integration All three are first-class citizens inside Nextcloud — arguably the most common deployment context for any of them. - **OnlyOffice** ships an official Nextcloud app; the Document Server runs alongside Nextcloud (separate container) and renders documents stored in Nextcloud Files - **Collabora Online** has the most established Nextcloud integration — most "edit document in Nextcloud" tutorials default to Collabora - **CryptPad** integrates via the CryptPad Nextcloud app, but operates on its own encrypted store rather than Nextcloud Files If you are already on Nextcloud, see [the Nextcloud self-hosting guide](/guides/self-hosting-guide-nextcloud-2026) for the broader stack and [open source alternatives to Dropbox](/guides/best-open-source-alternatives-to-dropbox-2026) if you're still picking your file layer. --- ## Performance Notes - **OnlyOffice** scales by adding more Document Server containers behind a load balancer; ~50 concurrent users per 4 GB / 2 vCPU node is a reasonable starting target - **Collabora** uses a fork-per-document model; sizing is by *concurrent open documents*, not user count — plan ~20 documents per 4 GB / 2 vCPU node - **CryptPad** is much lighter because the server isn't rendering documents — it's just shuttling encrypted blobs and presence updates For 100-seat organizations, expect to provision a dedicated VM for OnlyOffice or Collabora; CryptPad can usually share infrastructure. --- ## Migration Notes - **Google Docs / Microsoft 365 → OnlyOffice**: Direct file uploads work cleanly; complex collaboration history (comments, suggestions) survives partially - **OnlyOffice → Collabora**: Files transfer cleanly; expect minor formatting drift on complex `.docx` - **Anything → CryptPad**: Files import into CryptPad as PDF/ODF; you'll lose advanced formatting For Office-heavy organizations, the path that loses the least fidelity over a multi-year horizon is to standardize on OOXML and use OnlyOffice as the editor — the formats remain interchangeable with the rest of the world. --- ## Who Should Choose What **Choose OnlyOffice if:** - You exchange `.docx` and `.xlsx` files with the outside world - You want the most Office-365-like browser experience - You operate beyond Collabora's free-tier connection limits **Choose Collabora if:** - You're an ODF-first organization or government deployment - You already trust LibreOffice on the desktop - The MPL license posture matters more than minor fidelity gaps **Choose CryptPad if:** - You handle confidential information and need cryptographic guarantees, not just access controls - You're a journalist, legal team, healthcare provider, or activist organization - You're willing to trade format fidelity for privacy --- ## Verdict For most organizations migrating off Microsoft 365 in 2026, **OnlyOffice is the pragmatic default** — it minimizes the "documents look broken now" complaints from non-technical staff. **Collabora is the right answer for ODF-first or LibreOffice-aligned organizations.** **CryptPad is in a league of its own** for confidentiality and worth running even alongside one of the other two for the documents that genuinely need encryption. --- *Related: [Self-hosting Nextcloud](/guides/self-hosting-guide-nextcloud-2026) · [Open source alternatives to Dropbox](/guides/best-open-source-alternatives-to-dropbox-2026) · [Open source alternatives to Google Workspace](/guides/nextcloud-vs-google-workspace-migration-2026).*