How to open a .MHTML file online
No mail account and no extra software to install.
Pick your .MHTML file
Drag it in or click to choose it. It opens here in a moment.
Read it safely
The message opens in a locked-down view: scripts never run, and remote images often used for tracking stay blocked until you allow them.
Check and save
Download attachments, read the full headers, and see every server the message passed through, with SPF, DKIM and DMARC results.
About .MHTML files
What a .MHTML file is, and what's inside it.
An MHTML (.mhtml or .mht) file is a complete web page (HTML, images, CSS, and scripts) bundled into one file for offline viewing. Open it by dragging it into Microsoft Edge or Google Chrome (both support it natively). Internet Explorer, the old default opener, was retired in June 2022. To share or print the page, open it in a browser and choose Print > Save as PDF.
Programs that open .MHTML files
| Full name | MIME HTML (MHTML) Web Page Archive |
|---|---|
| Developer | IETF standard (RFC 2557); saved by Internet Explorer, Edge, Chrome, Opera, Word |
| First released | RFC 2557 (1999); popularized by Internet Explorer's 'Web Archive, single file (.mht)' |
| Category | |
| MIME type | multipart/related; message/rfc822 |
Related viewers
Open the attachments you find.
Is it safe to open a suspicious .MHTML file here?
Safer than in a mail client: the message runs in an isolated frame with scripts disabled, remote images and trackers are blocked until you allow them, and attachments are never opened automatically.
How can I tell if an e-mail is fake?
Look at the Message info panel. We show the SPF, DKIM and DMARC results recorded by the receiving server, warn you when the Reply-To address differs from the sender, and list every server the message passed through.
Can I open a Gmail or Thunderbird mailbox (.mbox)?
Yes. Drop the .mbox file and you'll get a searchable list of every message. Click one to read it.
Why does my MSG file show plain text only?
Some Outlook messages store their formatting only as compressed RTF. We show the text today; full RTF formatting is coming soon.
Can I open .pst or .ost files?
Not yet. Outlook data files are on our roadmap. Meanwhile you can export single messages from Outlook as .msg and open them here.
Was this tool helpful?
Your rating helps us decide which tools to improve next.