Open Source HTML Editor
Most tools people reach for when they want an HTML editor are not standalone apps at all; they are components you drop into your own product so users can produce markup without hand-writing tags. That changes the evaluation completely. You are not picking an editor to use, you are picking a dependency your application will carry, which means the markup it generates, the license it ships under, and how cleanly it embeds matter more than any toolbar. Open source options here let you inspect exactly what gets produced and keep the editing layer under your control, rather than piping your users' content through a hosted service you cannot audit or a format you cannot read.
GrapesJS
Free and open source web builder framework for creating HTML templates inside CMS and other apps
TinyMCE
Open source JavaScript WYSIWYG rich text editor with React, Vue, and Angular integrations
CKEditor 5
TypeScript rich text editor framework with WYSIWYG editing, plugins, and collaboration support
Paged.js
JavaScript library for paginated browser layouts and print book PDFs using HTML and CSS
Our picks
Best drop-in WYSIWYG editor: TinyMCE TinyMCE is the pragmatic choice for adding rich text editing to an app quickly. It is a configurable WYSIWYG component with classic, inline, and distraction-free modes, integrations for React, Vue, and Angular, and a large plugin catalog, deployable from its cloud or self-hosted. It is GPL v2 or later with commercial terms from Tiny.
Best for structured content and collaboration: CKEditor 5 CKEditor 5 suits products that care about the shape of the document, not just its formatting. Written in TypeScript, it uses a custom data model and virtual DOM that underpins real collaborative editing with comments and track changes, plus tables, Markdown, source editing, and export to PDF and Word. It is dual licensed under the GPL or commercial terms.
Best for building whole templates: GrapesJS GrapesJS is the pick when users need to build entire HTML templates, not edit a text field. It is a web builder framework designed to live inside a CMS, with drag-and-drop components, local and remote storage, and presets for webpages, newsletters, and MJML email. Its BSD license and CDN, npm, or Git install make it easy to embed.
Best for print and PDF output: Paged.js Paged.js solves a different problem: turning HTML and CSS into paginated print output and PDFs. It polyfills the CSS Paged Media and Generated Content modules so you can preview page breaks, running headers, and counters in the browser, and its CLI renders PDFs through headless Chrome. MIT licensed, reach for it when the target is a printed book.
What to weigh before embedding an HTML editor
Sort the field by what each tool actually is before comparing features, because this category mixes very different things. TinyMCE and CKEditor 5 are rich text WYSIWYG components you embed so end users can format content, each with React, Vue, and Angular integrations. GrapesJS is a web builder framework for constructing whole HTML templates by drag-and-drop, aimed at sitting inside a CMS. Paged.js is not an interactive editor at all; it is a library that paginates HTML and CSS for print and PDF. Matching the tool to the job is most of the decision here.
For the WYSIWYG components, the real question is the markup they emit and how far you can constrain it. A visual editor that produces noisy nested tags or lets users paste arbitrary styles will haunt your content model later. TinyMCE is configured through options and plugins that control the UI and editing behavior; CKEditor 5 uses a custom data model and virtual DOM, which gives tighter control over document structure plus collaboration features like comments and track changes. Inspect the generated HTML on real content, including pasted text from a word processor, before committing.
Weigh licensing and embedding as carefully as features, since these ship inside your product. Both TinyMCE and CKEditor 5 are dual licensed, open source under the GPL with commercial terms available, so confirm which applies to your use. GrapesJS is BSD licensed and loads from a CDN, npm, or Git with plugins for storage, export, and rich text. Paged.js is MIT and runs as a browser polyfill, with a CLI that renders PDFs through headless Chrome. Check the exit too: the output should be ordinary HTML and CSS that survives without the editor.
Related categories
Frequently asked questions
Are these standalone HTML editors or components I embed?+
Mostly components. TinyMCE and CKEditor 5 are rich text editors you embed in a web app so users can format content, and GrapesJS is a framework for building whole templates inside a CMS. None is a desktop file editor. Paged.js is different again, a library rather than an editor. So the first decision is not which app to install but which editing layer to build into your own product.
Which produces the cleanest markup for production?+
It depends on how much control you need over document structure. CKEditor 5 uses a custom data model and virtual DOM, which constrains what markup can exist and tends to keep output predictable. TinyMCE is contenteditable-based and highly configurable through plugins, so cleanliness depends on how tightly you set it up. Either way, test with real pasted content, since messy input is where editors most often leak unwanted tags and styles.
What is the difference between a rich text editor and a web builder here?+
A rich text editor like TinyMCE or CKEditor 5 edits the contents of a field: paragraphs, headings, links, and images inside your app. A web builder like GrapesJS constructs the whole page or template, laying out blocks, structure, and styles, which is why it targets CMS template building rather than filling in a text area. Pick the rich text editors for content fields and GrapesJS when users design entire layouts.
How do the GPL and commercial licenses on these editors work?+
TinyMCE is licensed under the GPL v2 or later with commercial terms from Tiny, and CKEditor 5 is GPL v2 or later with commercial license terms from CKSource. That dual model means the open source path carries copyleft obligations, so if you cannot comply with the GPL in your product you buy a commercial license. GrapesJS (BSD) and Paged.js (MIT) use permissive licenses with fewer strings attached.
Can these editors run offline or self-hosted?+
Yes. TinyMCE and CKEditor 5 can be self-hosted in your own application instead of loaded from a vendor cloud, and GrapesJS installs from npm or Git and stores content locally or remotely as you configure. Paged.js runs as a browser polyfill with an optional CLI. Since they are JavaScript that runs in your stack, offline and air-gapped deployment is a matter of bundling the assets rather than calling a hosted service.
What is Paged.js for, and when would I use it?+
Paged.js turns HTML and CSS into paginated output for print and PDF. It polyfills the CSS Paged Media and Generated Content modules, so you can preview page breaks, running headers, and counters in the browser, and its CLI renders finished PDFs through headless Chrome. Reach for it when your real target is a printed book or a paginated document rather than a scrolling web page, not when you need an interactive editor.
How do I stop users from pasting unsafe or messy HTML?+
Constrain the editor rather than trusting input. CKEditor 5's data model only allows markup you define, which filters out unexpected tags on paste, and TinyMCE offers paste cleanup and content filtering you can configure. On top of that, sanitize server-side before storing or rendering, since a client-side editor is a convenience, not a security boundary. Test by pasting content from a word processor and another website and reviewing the result.