Live HTML Preview
Live HTML Preview is a free browser tool that lets you edit html and see it render live. Parsing, formatting and validation all run in your browser, so API keys, tokens and internal payloads are never transmitted. It is used most by QA engineers comparing expected and actual output. Nothing is logged, which is what makes it safe for production data. There is no account to create, no email to hand over and no cap on how often you use it.
Key features
- Reports the line and position of a syntax error instead of failing silently.
- Follows the published specification rather than a loose approximation.
- Works on desktop, tablet and phone — no separate app to install.
- Built to do one job properly rather than twenty jobs badly.
How to use Live HTML Preview
- Paste your input: Drop the payload, code or value into the box above.
- Run it: Press the action button — errors are reported with their position.
- Take the output: Copy the result, or download it when the output is a file.
Frequently asked questions
- How large an input can it take? — Several megabytes is routine. The limit is your browser's memory, not a server quota.
- What happens with invalid input? — You get the position of the problem rather than a blank failure, so it is usable as a validator.
- Is there a rate limit? — None. There is no server involved, so nothing to limit.
- Does it follow the official spec? — Yes — the published specification, not a simplified version, so results match your language's own parser.