Free EML Converter
Convert to Any Format
Convert EML to PDF, MBOX, HTML, CSV, TXT, or JSON. Single or batch — private and secure.
Drop EML files here
or click to browse · select multiple files
What Is EML Conversion?
EML is a standard format for storing a single email message. It is based on RFC 822 (Internet Message Format) and MIME (Multipurpose Internet Mail Extensions). Each .eml file contains headers (From, To, Subject, Date, Content-Type, etc.) followed by a blank line and the body. The body can be plain text, HTML, or multipart (e.g. plain + HTML + attachments). EML is used by Mozilla Thunderbird, Outlook Express, Windows Mail, and many other email clients. Converting EML means taking one or more .eml files and turning them into another format — such as a single PDF (via printable HTML), one MBOX mailbox, CSV for spreadsheets, or HTML, TXT, or JSON for backup and analysis.
Our free EML Converter processes everything on your device. You drop one or multiple .eml files, and the tool parses each message: it splits headers from body at the first blank line, parses header key-value pairs (with RFC 2047 decoding for non-ASCII), and for multipart messages it extracts the boundary, parses each part, and decodes base64 and quoted-printable content with the correct charset. Extracted messages can be exported as PDF (print dialog), MBOX, CSV, HTML, TXT, or JSON. All processing is private; nothing is uploaded. Batch mode lets you combine many EML files into one MBOX, one CSV, or one HTML document.
Common conversion scenarios include archiving Thunderbird or Outlook Express mail as PDF, combining many EML files into one MBOX for import into another client, exporting metadata to CSV or JSON for analysis, and converting to HTML or TXT for readability. Because the tool works online, you can use it on any operating system without installing an email client. EML is widely supported, so converting to or from EML is a common step in migration and backup workflows.
Features of the EML Converter
Convert EML to multiple formats with one tool
Multiple output formats
Export EML to PDF (print-ready), MBOX, CSV, HTML, TXT, or JSON. One tool for archive and migration.
Batch mode
Select multiple .eml files at once. All are parsed and combined into a single export (e.g. one MBOX or one PDF).
Full MIME parsing
Parses headers, multipart boundaries, base64 and quoted-printable with charset support for accurate content.
No upload
EML is read and converted entirely on your device. Nothing is sent to any server.
Private & secure
Your email files never leave your device. Ideal for work or personal EML conversion.
Thunderbird & Outlook Express
Works with EML from Mozilla Thunderbird, Outlook Express, Windows Mail, and many other clients.
How to Convert EML Online
Four steps — no install, no sign-up
Open the EML Converter
Go to the EML Converter page and you'll see the upload area.
Drop one or more .eml files
Drag and drop .eml file(s), or click to browse (multiple selection supported). Parsed email count appears.
Choose output format
Select PDF, MBOX, CSV, HTML, TXT, or JSON. Review the preview table (From, To, Subject, Date, snippet).
Convert & download
Click Convert & Download. PDF opens the print dialog; other formats download a single combined file.
Free vs Paid — EML Converter
Get started free, upgrade when you need more power.
Unlock the Full Power of EML Converter
Remove daily limits, process larger files up to 500 MB, enable batch processing, and get priority support.
File Viewers includes:
- 21 file viewers included
- Unlimited daily uses
- 100 MB file size limit
- All file formats supported
- Email analysis tools
Also available in the All Tools Bundle
User Q&A
Common questions about EML conversion
Why convert EML to PDF?
PDF is ideal for archiving or printing. The tool generates a printable HTML page with all emails; use Print → Save as PDF to get a PDF file.
Why convert EML to MBOX?
MBOX stores many messages in one file. Converting EML to MBOX lets you import into Thunderbird or Apple Mail as a single mailbox.
Can I convert multiple EML files at once?
Yes. Select multiple .eml files (or drop them together). All are parsed and combined into one export (one MBOX, one CSV, one HTML, etc.).
Does it handle attachments?
The tool parses multipart MIME and extracts headers and body (plain/HTML). Attachment binary data is not included in the export; for full attachment support, use a desktop client.
Use Cases for EML Conversion
When and why to convert EML files
Archive as PDF
Convert EML messages to a single printable HTML page, then save as PDF for long-term archive.
EML to Thunderbird
Combine many EML files into one MBOX and import into Mozilla Thunderbird.
CSV for analysis
Export From, To, Subject, Date, and body preview to CSV for spreadsheet or reporting.
JSON for developers
Get structured JSON (headers and body) for scripting, migration, or integration.
HTML for viewing
Convert EML to a single HTML page to view all messages on any device.
Compliance & backup
Export EML to standard formats (PDF, TXT, HTML) for legal or backup purposes.
Frequently Asked Questions
More answers about the EML Converter
Q1. What is an EML file?
Q2. Do you upload my EML files?
Q3. What is the difference between EML and MBOX?
Q4. Can I convert EML to PDF?
Q5. Does it support non-English characters?
Q6. Is the EML Converter free?
Q7. Does it work on Mac?
Q8. What about MSG files?
Related Tools
More converters and viewers from OnlinePCTools