Both of these products edit DOCX files as native OOXML rather than converting through an intermediate JSON or HTML format. Compared to other options available to developers, this distinction massively improves accuracy and fidelity of Word documents loaded in your app.

Editors that round-trip through JSON or HTML can lose headers, footers, pagination, and tracked-changes data on export. Apryse and OnlyOffice both write OOXML directly, so formatting survives when the file reopens elsewhere. Track changes are a second point of parity. Apryse and OnlyOffice both produce OOXML w:ins and w:del markup that Microsoft Word reads correctly, along with headers, footers, and comments.

See the full DOCX Editor comparison for how Apryse stacks up against other embeddable editors in addition to OnlyOffice.

Apryse's DOCX Editor runs on WebViewer's C++ core, compiled to WebAssembly to run in your JavaScript application. Every edit, from a keystroke to a tracked-changes accept, executes in the browser. No document content is transmitted, stored or processed anywhere. With client-side processing, loading and processing documents relies on the computing resources of each client device.

OnlyOffice takes the opposite approach. OnlyOffice Docs is the editing component, but it cannot render or edit a document without OnlyOffice Document Server, a separate backend you deploy through Docker or Kubernetes. Every keystroke is sent to that server, processed, and the result streamed back to the browser. The processing relies on massive server-side computing resources, which can be a benefit, but can also introduce latency and costs.

This is the core tradeoff behind the whole comparison. Read the native OOXML architecture page for the deeper technical explanation of why client-side OOXML editing avoids the round-trip problem entirely.

The DOCX Editor add-on to WebViewer requires no backend deployment. The constructor mounts the editor to a DOM element and starts editing once the license and static assets are in place.

OnlyOffice requires the Document Server running before any client-side code can connect to it. The pattern below reflects OnlyOffice's publicly documented Docker deployment and editor initialization. Confirm exact configuration options against OnlyOffice's current API documentation before use.

Once the Document Server container is running and reachable, initialize the editor from the client.

Apryse licenses the DOCX Editor commercially, with flat pricing and one license key covering the add-on's full feature set. There is no per-page or per-token fee, and no separate SKU for a bigger deployment.

OnlyOffice ships two licensing paths. The Community Edition is free under AGPLv3, but AGPLv3's network-use clause requires you to disclose the source code of any SaaS product that embeds it, including your own application code, if users interact with it over a network. Teams that cannot make their own source public typically move to the commercial Developer or Enterprise Edition instead, which carries its own separate pricing and sales process.

The Apryse DOCX Editor does not currently offer real-time co-editing. Apryse supports comment-based and track-changes-based collaboration instead: reviewers leave comments, propose edits as tracked changes, and accept or reject them, working sequentially rather than simultaneously. For workflows built around structured review and approval, sequential review with a full audit trail through tracked changes meets users' needs.

Apryse's DOCX Editor keeps documents in the browser for the entire editing session. No document content crosses the network to Apryse or to any third party. Read the secure client-side editing page for the full architecture. Apryse holds SOC 2 (since 2023) and ISO 27001 (since 2018).

OnlyOffice's self-hosted Document Server keeps documents on infrastructure you control, which addresses data residency at the deployment level. But every keystroke still crosses the network from the browser to that server for processing, and OnlyOffice does not publicly document a SOC 2 or ISO 27001 certification for the Document Server, or make a formal WCAG accessibility claim. OnlyOffice maintains a public bug bounty program rather than publishing independent penetration-test results.

A 2026 Cybernews supply-chain analysis found that approximately 90 percent of commits in the Euro-Office codebase, the Nextcloud, IONOS, and Proton fork that inherited OnlyOffice's code, carry a Moscow-timezone timestamp, a data point some procurement teams weigh alongside the architecture question.

OnlyOffice's Nextcloud integration partnership also ended in June 2026, when Nextcloud, IONOS, and Proton forked their own Euro-Office alternative rather than continuing to build on OnlyOffice, a data point worth factoring into any long-term ecosystem dependency.

Apryse's DOCX Editor needs no server infrastructure at all. It scales the way any static browser asset scales: through a CDN, with no document server to provision, patch, or monitor.

OnlyOffice's Document Server is a stateful backend service. Scaling it to more concurrent editors means running more Document Server instances, load-balancing between them, and keeping a Docker or Kubernetes deployment patched and monitored. That is real operational work your team owns (and pays for) for as long as the product is in production.

OnlyOffice is currently an option for developers when real-time co-editing is a hard requirement rather than a nice-to-have. It also fits teams already running Docker or Kubernetes in production, where standing up another containerized service adds little incremental operational burden. And it fits the self-hosted, open-source-first community where AGPL obligations are already an accepted part of the stack.

Apryse is the stronger choice when your product cannot run additional backend infrastructure, or when you would rather not own it. The DOCX Editor runs entirely client-side, which keeps documents off the network by default and removes the Document Server from your infrastructure and your GDPR data-residency conversation. It also fits teams that need a flat, predictable commercial license rather than navigating AGPL source-disclosure obligations inside a commercial SaaS product, and regulated industries where SOC 2 and ISO 27001 certifications are part of the vendor evaluation.