How to use the HTML Viewer
- Open an .html file — a saved web page, an email template or an export.
- Preview it at desktop, tablet or phone width.
- Switch to Source to read the formatted markup.
Safe previews of untrusted HTML
HTML files from unknown sources can contain scripts or tracking pixels. The preview runs in a sandboxed frame with all permissions removed: no JavaScript, no form submissions, no pop-ups, no navigation, and no access to this site.
By default a content security policy also blocks remote images, stylesheets and fonts, so opening the file doesn't tell anyone you looked at it. Tick “Load remote images and styles” to see the page as designed.
Related tools
Tidy messy markup with the HTML formatter, or pull out just the words with HTML to Text.
Frequently asked questions
Why does the page look broken?
Pages saved from websites often depend on scripts or external files. Scripts never run here, and remote files only load if you allow them.
Is my file uploaded?
No. It's displayed from your device.