Open Outlook, encrypted, and Publisher files without installing Microsoft Office. Most tools run 100% in your browser — private by default, free, no sign-up.
You should not need a full Office license just to open a .msg attachment, extract a winmail.dat package, or inspect a rights-protected .rpmsg file. JustToolkit focuses on the awkward Microsoft formats people actually receive — with real parsers, not thin wrappers.
Privacy first: RPMSG, MSG, EML, and Winmail tools parse files locally in your browser. Nothing is uploaded for those tools. PUB Viewer is different by design: it converts Publisher files server-side with LibreOffice Draw for layout fidelity, then auto-deletes the job files.
Start with a tool below, or read our format guides if you are not sure which extension you have.
Best for: encrypted Outlook IRM mail (.rpmsg). Inspect OLE/CFB structure, protection type, and issuer hints before you authenticate.
Does not decrypt without Microsoft rights — it explains what you have and how to open it safely.
Open RPMSG Viewer →Best for: Outlook .msg exports. Read subject, from/to, body, and download attachments without installing Outlook.
Client-side MAPI/CFB parsing. Ideal for legal holds, backups, and one-off files.
Open MSG Viewer →Best for: standard MIME .eml files from Gmail, Apple Mail, Thunderbird, and most clients.
View headers, HTML/plain body, and save attachments in the browser.
Open EML Viewer →Best for: TNEF winmail.dat blobs Outlook sometimes sends to non-Outlook users.
Extract the real PDFs, Word docs, and images trapped inside.
Open Winmail Viewer →Best for: Microsoft Publisher .pub flyers and newsletters when you do not have Publisher installed.
Server-side LibreOffice Draw conversion → PDF preview + download. Files auto-deleted after processing.
Open PUB Viewer →| You have… | Open with | Guide |
|---|---|---|
.rpmsg / encrypted Outlook | RPMSG Viewer | What is RPMSG? |
.msg Outlook save | MSG Viewer | MSG vs EML |
.eml universal export | EML Viewer | Format comparison |
winmail.dat | Winmail Viewer | Extract TNEF attachments |
.pub Publisher file | PUB Viewer | PubViewer vs LibreOffice |
Email tools use format-aware parsers (OLE/CFB for Outlook containers, MIME for EML, TNEF for winmail). That means you get real structure — headers, body parts, attachment streams — instead of a black-box “convert” button with no visibility.
New tools ship regularly under the same privacy rules. Prefer a format guide first? Browse the JustToolkit blog for RPMSG, PUB retirement, and open-without-Office walkthroughs.
Yes. No account, no paywall, no watermark on client-side tools. PUB conversion is also free with fair-use rate limits to protect the server.
RPMSG, MSG, EML, and Winmail tools process files in your browser only. PUB Viewer uploads briefly for LibreOffice conversion, then deletes the files.
No legitimate tool can bypass Microsoft rights management. Our RPMSG viewer helps you identify protection type and open the message through supported Microsoft flows. See RPMSG vs OME.