Yes — Kopitiam is ad-funded with no paywall and no sign-up.

Does my file get uploaded?

No. The file is read and edited entirely in your browser; it never leaves your device.

Which file types can I edit?

Markdown (.md), JavaScript/TypeScript, Python, HTML, CSS, JSON, YAML, and most plain-text and code formats.

Yes — open a .md file and a live rendered preview updates beside the editor as you type.

Yes, powered by CodeMirror, with highlighting for Markdown, JS/TS, Python, HTML, CSS and JSON.

Open a Markdown, code, or text file and edit it with syntax highlighting and a live preview — free, in your browser. Nothing is uploaded.

or click to choose a file. Everything stays on your device.

or start a blank document: