Zovo tools

EML Viewer Online

Drop an e-mail file to read it: the message as sent, its attachments, all headers, the route it took and the SPF, DKIM and DMARC results. Whole .mbox mailboxes open as a list you can search. No account and no upload.

EML Viewer & Email Preview for VS Code and Cursor, free

Opens a mail file the moment you click it in the Explorer, and reads mailboxes of many GB without loading them whole.

Get it on the VS Code MarketplaceOpen VSX (Cursor, Windsurf)Install in VS Code

Optional Zovo Pro, USD 19 once: mail list to CSV, save all attachments and split a mailbox.

Your file never leaves this browser. The page reads it on your computer. Nothing is uploaded, there are no tracking cookies, and it keeps working offline once loaded.

Drop an .eml file here

or

E-mail messages (.eml), Apple Mail (.emlx) and mailboxes (.mbox, Thunderbird and Google Takeout), up to 500 MB. Outlook .msg files need to be saved as .eml first.

Open this in VS Code or Cursor

The same viewer runs inside VS Code and Cursor. There it opens a mail file the moment you click it in the Explorer, and reads mailboxes of many GB without loading them whole.

Install in VS CodeMarketplaceOpen VSX (Cursor, Windsurf)

Free, MIT license. About EML Viewer & Email Preview for VS Code.

Zovo Pro

Mail list to CSV, save all attachments and split a mailbox. Zovo Pro, USD 19 once.

In the EML Viewer extension, Zovo Pro writes one CSV row per message of a mailbox or folder (date, sender, subject, attachments, SPF, DKIM and DMARC), saves every attachment of many mails into one folder, and splits an .mbox file into single .eml files. Each Pro tool works 3 times for free. One payment covers the Pro tools in 22 Zovo extensions. Everything that is free stays free.

Pay by card, USD 19GitHub Sponsors, USD 19 oncePayPal, USD 19

After a card payment you get a key on the page. With GitHub Sponsors you sign in from the extension. Details on the Zovo Pro page.

Related tools

Questions

Is my e-mail uploaded anywhere?

No. The page reads the file inside this tab with the EML Viewer extension's own mail reader. The page CSP sets connect-src to none, and the viewer frame cannot reach any server. Open the Network tab of your browser tools and you will see no request when a mail opens.

Why are the pictures in the mail not shown?

Pictures that a mail loads from the web are blocked on this page. Loading them would tell the sender that you opened the mail, and when and where. Pictures sent inside the mail (inline attachments) are shown. The VS Code extension can show remote pictures after you click.

Is a mail with scripts or a phishing link safe to open?

The message HTML goes through an allow-list cleaner and is shown in a sandboxed frame where no script can run. Links open only after you click them, in a new tab, and only web and mail links. Attachments are never opened, only saved when you click Save.

What can I see besides the message?

All headers, the raw source, the route the mail took from server to server with the time of each hop, and the SPF, DKIM and DMARC results that the receiving server wrote, as badges. That helps to spot a forged sender.

Can it open a whole mailbox?

Yes. An .mbox file (from Thunderbird, Apple Mail export or Google Takeout) opens as a list of messages with search and sort, up to 500 MB here. Click a message to read it.

Can I open Outlook .msg files?

Not yet. Save the mail as .eml in your mail program first (in Outlook on the web, Download; in Outlook, drag the mail to a folder), then open the .eml here.

What is free and what is Zovo Pro?

Reading messages and mailboxes, headers, source, route, the SPF, DKIM and DMARC badges and saving attachments one by one are free here and in the VS Code extension. A mail list as CSV, saving all attachments at once and splitting a mailbox are Zovo Pro in the extension. One USD 19 payment covers the Pro tools in every Zovo extension.