Free online MBX to PDF converter

What the MBX format is

MBX is a mailbox format used to store email messages, commonly by Eudora and some older mail applications. An MBX file can contain multiple messages in one file, including headers, plain-text or HTML bodies, and references to attachments; it is not normally a single document intended for direct reading.

MBX files usually appear when recovering mail from an old computer, migrating an Eudora mailbox, or opening an archived email collection after the original mail program has been replaced. Some programs also keep a companion index file, such as a .toc file; preserve it during migration, although the message data is stored in the MBX file.

What the PDF format is

PDF stores a document’s text, layout, fonts, and graphics in a fixed form that works across operating systems and does not require the original email application. It is suitable for sending selected messages, printing correspondence, and creating read-only archives.

PDF conversion normally preserves the rendered message content and headers, but it does not preserve the MBX mailbox structure as an editable email database. Attachments may need to be saved separately unless the conversion tool explicitly embeds or converts them.

How to convert MBX to PDF

Using the built-in online converter

1. Open the MBX-to-PDF converter on 101convert.com.
2. Upload the .mbx file. If the mailbox contains private correspondence, check the service’s file-handling and deletion terms before uploading it.
3. Select PDF as the output format and start the conversion.
4. Download the resulting PDF and verify that message headers, dates, body text, page breaks, and any required attachments are present.

Depending on the converter, a mailbox may produce one combined PDF or separate PDF files for individual messages. If the MBX file is rejected, import it into a compatible mail application and use the desktop printing method below.

Using a desktop mail application

1. Make a backup copy of the MBX file before importing it.
2. Open the mailbox in Eudora, if it is available, or import it into Mozilla Thunderbird using an MBX/Eudora-compatible import extension such as ImportExportTools NG.
3. Open the required message and choose File → Print.
4. Select a system PDF printer, such as Microsoft Print to PDF on Windows or Save as PDF in macOS and many Linux print dialogs.
5. Choose the output filename and save the message. Repeat for other messages, or select multiple messages only if the mail application provides a combined print or export function.

This method is preferable when the mailbox contains HTML formatting, inline images, non-ASCII characters, or attachments that need manual verification.

Quality and compatibility limitations

• MBX is a mailbox container rather than a standardized document layout, so different converters may render HTML email differently.
• Embedded images, signatures, CSS formatting, remote images, and unusual character encodings can change during conversion; printing from a mail client usually gives better control.
• PDF generally captures the visible message, not interactive email behavior, message flags, folders, filters, or the original attachment relationship.
• For legal or evidentiary archiving, retain the original MBX and any companion index files alongside the PDF; the PDF alone may omit technical metadata and raw message headers.