HTML Viewer
Paste HTML to preview the rendered output and view formatted source side by side. Runs entirely client-side.
How it works
- 1
Paste your input
Type or paste your data into HTML Viewer.
- 2
Adjust options
Tweak the available settings — the output updates as you type.
- 3
Copy the result
Copy the output to your clipboard or download it as a file.
Common uses
- Preview a snippet of HTML rendered next to its source.
- Sanity-check markup from an email or CMS export.
- Format messy HTML into readable, indented source.
About the HTML Viewer
Paste HTML to preview the rendered output and view formatted source side by side. Runs entirely client-side.
HTML Viewer is part of a free, privacy-first toolkit. Everything is computed instantly on the client, so your data never leaves the page — useful when you're working with sensitive payloads.
Because html viewer works without any sign-up or installation, you can use it as often as you like and it's always available — on desktop or mobile, and even offline.
Explore more developer tools, or try JSON Formatter · JSON Validator.
Related tools
HTML Viewer — FAQ
No. The preview is sandboxed and renders HTML and CSS only, so scripts in the markup are ignored for safety.