Ask AI from the toolbar
Proofread, rewrite, shorten, expand, summarize, translate, or justify from the selection or whole document.
Feature overview
Features designed for real editing, review, and structured content workflows.
A polished authoring surface, cleaner markup, AI-assisted review, structured JSON and Markdown workflows, customization APIs, and the content tools teams actually use.
AI workflows
Ask AI, AI Chat, inline preview, and AI Review inside the editor.
Structured content
Bridge editing into JSON, Markdown, static render, and validation.
Cross-device
Desktop, tablet, and touch editing with consistent behavior.
Feature highlights
Modern JavaScript rich text editor with a modular architecture.
RichTextEditor provides a rich plug-in development environment, allowing you to customize its user interface and functionality to fit your needs.
You can upload document files, create a link from your HTML content to the document files (zip files, ppt files…).
Authoring
WYSIWYG editing, formatting, undo/redo, full-screen, rich toolbar control.
Content cleanup
Office paste handling, cleaner HTML, and downstream-friendly structured output.
Customization
Plugin APIs, custom dialogs, configurable toolbars, and AI workflow hooks.
Structured output
HTML, JSON, Markdown conversion, and static preview rendering.
What we don’t charge extra for
Every feature below is in the base $129 perpetual license.
Other commercial editors meter AI, gate Track Changes behind add-ons, or put Web Forms / Blazor / Classic ASP bindings in the Enterprise tier. We don’t. See the head-to-head comparison.
✓ AI Toolkit + BYOK✓ Structured content (JSON/MD)✓ Self-host at entry tier
Native bindings
JavaScriptTypeScriptReactVueAngularBlazor ServerASP.NET CoreASP.NET Framework MVCASP.NET Web FormsPHPClassic ASP
What you get
A complete editor, organized by the work you do.
Thousands of teams use RichTextEditor inside content management systems, knowledge bases, e-learning, email builders, and line-of-business apps. Every capability below is available through the toolbar, the JavaScript API, or both.
New
Latest workflow
AI Toolkit
Ask AI, AI Chat, inline suggestion preview, and the AI Review drawer directly inside the editor.
Ask AIChatReview
Latest demo
Structured JSON
Capture semantic JSON, round-trip Markdown, render static HTML, validate before save.
JSONMarkdownRender
Developer demo
JavaScript API
Control content, selection, insertions, commands, and editor behavior from your app code.
EventsCommandsSelection
18+
Years of development
25k+
Customers
60+
Countries
23
Languages
AI workflowsv2.3 Newv2.0 NewAuthoringOutput & skinningPaste & importMedia & templatesDeveloper APIsContent controlAccessibility & i18n
AI workflows
Open AI Toolkit →Docked AI Chat
Multi-turn, scope-aware conversation panel with quick prompts and copy/apply/insert/replace actions.
AI Review drawer
Persistent queue of pending, accepted, and rejected suggestions with optional server-ledger sync.
Inline preview
See suggested changes in place before they commit. Accept or reject at the suggestion level.
Custom actions
registerAction plugs domain-specific modes (legal review, SEO rewrite, tone match) into the same UI.
No-API-key demo mode
Ships with a deterministic local resolver so you can evaluate the UX before wiring a real provider.
New in 2.3 · in the base license
Modern blocks, smart input, and accessibility
▶ Try it liveFull release notes →Notion-style blocks and a slash menu, diagrams and equations, inline Markdown and emoji autocomplete, foldable headings, distraction-free typewriter & focus modes, AI ghost-text autocomplete, Markdown export, local-draft recovery, read-aloud, and one-click email HTML — all editor-native, injection-safe, and in the base $129 license. No premium tier.
Slash commands
Type / for a searchable insert menu — headings, lists, callouts, columns, toggles, equations, diagrams, tables, and more. Structure without leaving the keyboard.
Callouts, columns & toggles
Info / success / warning callout boxes, 2–4 column responsive layouts, and native <details> toggles. Editor-native; round-trips through getHTMLCode / getJSON.
Equation editor
TeX / LaTeX dialog with live preview and edit-in-place. Renders via KaTeX or MathJax loaded on your page; emits stable .rte-math-inline markup.
Mermaid diagrams
Author flowcharts, sequence, gantt, and pie charts as code, rendered to SVG. Use a host mermaid instance or a server resolver (e.g. Kroki); the source round-trips for re-editing.
Web-bookmark cards
Turn a URL into a rich link-preview card — favicon, title, description, domain. Zero-backend by default, or wire a resolver for full unfurls. http(s)-only and escaped.
Block drag-handles
A drag handle appears on hover to reorder top-level blocks. It lives outside the editable, so your saved HTML stays clean.
Smart chips
Google-Docs-style date, person, and link chips — atomic, injection-safe, and round-tripping. Person / link chips use an optional resolver for live suggestions.
Inline Markdown
Type **bold**, *italic*, `code`, ~~strike~~, plus block shortcuts (#, >, -, 1.). Word-boundary aware, so identifiers and math are left alone.
Emoji :shortcode: autocomplete
Type :fire: and it becomes an emoji inline, or : + a query for a keyboard-navigable popup. GitHub / Slack style; ~140 curated codes, extensible.
Read-aloud
Text-to-speech of the selection or document, highlighting each sentence as it’s spoken. Browser-native via the Web Speech API — no backend, no key. The speech-out complement to dictation.
Email HTML export
One-click, inline-styled HTML for Outlook and Gmail — computed styles inlined, classes stripped, wrapped in a centered table. editor.getEmailHTML().
Spell check
Native browser spell-check out of the box, or wire a resolver (LanguageTool / server / LLM) for a review panel with click-to-replace suggestions.
To-do / task lists
Interactive checklists with clickable checkboxes (Notion / GitHub style). Done state lives in data-checked and round-trips through getHTMLCode / getJSON — no fragile <input>s.
Auto-embed media
Paste a YouTube or Vimeo URL on its own line and it becomes a responsive 16:9 embed (Notion / Medium style). Injection-safe — the iframe src is rebuilt from a sanitized video id.
Foldable headings
Obsidian / Notion-style section folding — click the gutter chevron on a heading to collapse everything beneath it. Fold state is runtime-only; saved markup stays clean and content is never lost.
Typewriter & focus mode
Distraction-free writing: typewriter scrolling pins the caret line to a fixed anchor (iA Writer / Typora), and focus mode dims every block except the current one. Purely presentational.
Copy / Download as Markdown
Notion-style export of the whole document to Markdown — one-click copy to clipboard or save as .md. editor.getMarkdown() / copyAsMarkdown() / downloadMarkdown().
Local draft recovery
Autosaves to localStorage as you type and offers to restore the unsaved draft after a crash or refresh (Gmail style). Never auto-applies; prunes stale drafts. Opt-in via config.localDraft.
AI ghost-text autocomplete
Copilot / Notion-AI-style inline completion — pause typing and a greyed suggestion continues your sentence; Tab accepts, Esc dismisses. Bring-your-own resolver (no model ships); serialization-safe and undo-friendly.
Server-side document export, voice input, mobile-first layout, pluggable upload backends, named version milestones, and built-in AI provider adapters. All shipped in the base license — no premium tier.
DOCX export
Server-side HTML → .docx via MIT-licensed DocumentFormat.OpenXml. Client helper triggers a browser download. No cloud SaaS subscription.
Built-in AI provider resolvers
One-line DI for OpenAI, Anthropic, and Azure OpenAI. Works with OpenAI-compatible endpoints (Groq, Together, Ollama) via BaseUrl.
Streaming AI responses
Server-Sent Events relay provider tokens as they arrive. JS helper streamRequest({ onDelta, onDone }) with XHR fallback. Abortable mid-stream.
Dictation
Web Speech API microphone button. Live interim transcripts, auto-punctuation, BCP-47 language. Chrome / Edge / Safari / Opera. The only major editor shipping this.
Mobile toolbar mode
Compact single-row toolbar. 44×44 tap targets (WCAG 2.5.5), sticky header above the virtual keyboard, bottom-sheet dropdowns. Auto-swap on narrow viewports.
Pluggable cloud uploads
Implement IRichTextBoxUploadStore to route uploads to S3, Azure Blob, Cloudinary, GCS, or any custom backend. Default writes to local disk.
Named revisions + diff API
Take named snapshots (“Draft sent to legal”), rename existing entries, filter to user-named only, generate side-by-side diffs. Closes CKEditor’s premium named-versions differentiator.
Improved Paste from Word
Detects ordered vs unordered list type from the marker span, parses nesting depth, strips actual bullet glyphs. Numeric / Roman / alphabetic markers round-trip as <ol>.
Per-node Yjs CRDT engine
Opt in with textSync: "crdt": same-paragraph concurrent typing via per-node Yjs binding, presence cursors via Y.RelativePosition, per-author Y.UndoManager (Ctrl-Z undoes only your edits). 88 KB minified, ships in the base license. Pairs with any Yjs provider you self-host.
Output & skinning
Clean HTML
Produces a minimal, consistent markup tree - publish-ready without a second cleanup step.
XHTML or HTML 5
Choose well-formed XHTML 1.0 or HTML 5 output based on your downstream requirements.
Structured JSON bridge
Round-trip between HTML and semantic JSON. Store content as data, render on demand.
Markdown conversion
Import and export Markdown with structure preserved for docs, tickets, and cross-tool workflows.
Static HTML render
Publish read-only HTML from structured content for emails, archives, and server rendering.
Indented output
HTML mode shows neatly indented markup with lowercase tags for readable diffs.
External CSS
Point ContentCss at one or more stylesheets. The editor renders with your app’s type and spacing.
CSS skinning
Bundled themes plus complete class/image overrides. Tailor the chrome to your product.
Relative or absolute URLs
Emit the URL form your publishing pipeline expects - no manual post-processing.
Paste & import
Paste from Word
Strips Word-specific markup so the pasted result reads as clean HTML without bloat.
Paste from Excel
Preserves table structure and colors while dropping spreadsheet-specific noise.
Paste modes
Keep source formatting, strip to character-level formatting, or paste as plain text.
Word-list conversion
Word’s MsoListParagraph paragraphs convert to proper <ul>/<ol> on paste.
Drag-and-drop images
Drop images from the desktop or from another browser tab. Re-arrange in place without losing them.
File upload
Upload documents, link them from content. Configurable file type filter and size limits.
Media & templates
Image upload & gallery
Built-in thumbnail generator, pagination, auto resize, rename/delete, and folder management.
Embed video & audio
Insert YouTube, MP4, and audio assets with the built-in dialog or the media-embed plugin.
Templates
Ship a library of starter layouts. Designers build templates once and authors reuse them.
Code snippets
Insert pre-formatted code blocks by picking a snippet instead of pasting from another tool.
Emoji picker
Searchable emoji dialog with consistent rendering across platforms.
PDF export
Export the current document to PDF client-side for downloads, attachments, and archives.
Developer APIs
Rich client-side API
Read/write content, manage selection, insert nodes, fire commands, and subscribe to a rich event set.
Plugin development
Extend the toolbar with new commands, dialogs, and side panels. Same extension surface the built-ins use.
Custom dialogs
Build your own modal flows with custom forms and event handlers. Consistent look and keyboard handling.
Toolbar customization
Show, hide, re-arrange, or replace buttons. Add icon sets, groupings, and subtoolbars.
AI resolver hook
Plug your backend into the AI Toolkit with one function. Same UI, your model, your policies.
Placeholders & merge fields
Insert semantic tags as placeholders for dynamic values. Great for mail-merge and templating.
Content control
Content filtering
White-list / black-list HTML elements and attributes. Limit what end-users can save.
Max HTML / text length
Cap input to protect downstream database columns and APIs before anything hits the wire.
Tag inspector
Navigate the tag hierarchy, inspect attributes, remove wrappers, and clean up structure.
Validation
Validate structured content before save with the JSON bridge - reject bad shapes at the editor layer.
Comments & review
Non-destructive comment markers on selections. Pair with the AI Review drawer for a full flow.
Event hooks
Listen to change, focus, paste, and command events to drive autosave, dirty flags, and audit trails.
Accessibility & localization
WAI + Section 508
Accessibility settings help you meet Section 508 and W3C WAI guidance for rich content authoring.
Keyboard-first
Every toolbar command, dialog, and panel has a keyboard path. Focus management is predictable.
23 languages
Drop-in language files for every label, button, tooltip, and message. Add a new language in minutes.
RTL support
Right-to-left editing for Arabic, Hebrew, Persian, and other RTL scripts - end to end.
High-DPI icons
SVG icon set scales cleanly from 100% up to 4K retina displays without fuzz.
Reduced motion
Respects prefers-reduced-motion to disable decorative transitions where the user asks.
Ready to evaluate?
Open the AI demo, then dive deeper.
Try Ask AI, Chat, and Review without an API key. Download the evaluation package when you are ready to drop the editor into your own project.
Trusted by
25,000 customersin 60+ countries. 23 languages supported, and more being added.