Dev Tools

Ace Editor Playground — In-Browser Code Editor

Try the Ace code editor live: syntax highlighting for 45+ languages, 24 themes, keyboard modes, and every editor setting in one kitchen-sink playground. Runs entirely in your browser — nothing you type is ever uploaded.

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About Ace Editor Playground — In-Browser Code Editor

Ace is a high-performance, open-source code editor written in JavaScript that powers editors like Cloud9 IDE — it matches the feel of native editors such as Sublime, Vim, and TextMate. This is Ace's own "kitchen sink" demo, self-hosted directly from the ajaxorg/ace source, letting you try the full editor with syntax highlighting for 45+ languages, 24 color themes, selectable keyboard handlers (Vim/Emacs/Sublime), and live control over every editor setting. It runs entirely in your browser; nothing you type is uploaded to any server by this site.

How to use

  1. Type or paste code into the editor pane in the center.
  2. Use the options panel on the left to switch language mode, theme, keyboard handler, font size, and dozens of other settings.
  3. Copy your code out when done — everything stays in the browser, so there is no save-to-cloud step.

Frequently asked questions

Is my data uploaded anywhere?
No, it runs entirely in your browser — the code you type and every setting stay on your machine and are never sent to a server by this site.
Which languages and themes are available?
Syntax highlighting for 45+ languages and 24 color themes, all selectable from the options panel.
Can I use Vim or Emacs keybindings?
Yes — the keyboard handler setting switches between the default, Vim, Emacs, and Sublime key modes.
Is this the real Ace editor?
Yes. It is the unmodified Ace "kitchen sink" demo served straight from the open-source ajaxorg/ace source (BSD-3-Clause).