MailtoPst
FR Try Free
EML PST

Convert EML to PST
Free Online Tool

Convert EML files to Outlook PST format online. Batch convert hundreds of .eml files into a single PST archive. EU servers, GDPR compliant.

Convert now — free → See how it works
🛡️ GDPR Compliant 🔒 TLS 1.3 Encryption 🇪🇺 EU Servers 🗑️ Auto-delete 48h

What is a EML file?

EML (Electronic Mail) is the standard file format for individual email messages. Each .eml file contains a single email with its headers, body, and attachments encoded in MIME format (RFC 5322).

EML files are used by:
- Windows Mail and Windows Live Mail — Microsoft's built-in email clients
- Mozilla Thunderbird — can export individual messages as .eml
- Outlook Express — the legacy Windows XP email client
- Most email servers — raw email delivery uses this format
- Email forensics tools — EML is the standard for preserving individual messages

EML is excellent for individual messages but impractical for managing large mailboxes — a mailbox with 10,000 emails means 10,000 separate .eml files, making organization and search difficult.

What is a PST file?

PST (Personal Storage Table) is Microsoft Outlook's proprietary format for storing email messages, calendar events, contacts, and tasks. It's the standard archival format for corporate email worldwide.

Key features of PST:
- Folder hierarchy — preserves your complete folder structure
- Rich metadata — retains attachments, read status, flags, categories
- Search-ready — Outlook indexes PST files for instant search
- Password protection — optional encryption for sensitive data
- Universal Outlook support — works with Outlook 2007 through Microsoft 365

PST is the go-to format for email archiving, legal discovery (eDiscovery), and migrating between email systems in enterprise environments.

Why convert EML to PST?

Converting EML to PST is essential when you need to consolidate individual email files into a single Outlook-compatible archive:

1. Consolidating email exports
If you've exported emails from Windows Mail, Outlook Express, or a mail server as individual .eml files, merging them into a single PST makes them manageable in Outlook.

2. Email migration to Outlook
When migrating from an email client that uses EML (Windows Live Mail, Outlook Express, some IMAP backups), converting to PST is the fastest way to import into Outlook.

3. Legal discovery (eDiscovery)
Law firms and compliance teams often receive email evidence as .eml files. Converting to PST creates a searchable, organized archive for review.

4. Reducing file clutter
Thousands of .eml files are hard to manage. A single PST file with proper folder structure is much more practical for archiving and backup.

EML vs PST — Key Differences

Feature EML PST
File structure One file per email message Single database file for all emails
Folder hierarchy Folder = directory on disk Full folder tree inside the file
Max file size One email per file (typically KB to MB) 50 GB (Outlook 2010+)
Email clients Thunderbird, Windows Mail, most clients Microsoft Outlook (all versions)
Batch management Difficult with thousands of files Single file, easy to manage
Search Requires file system search Native Outlook search integration
Encryption S/MIME per message only File-level password protection
Portability Highly portable, universal format Outlook-specific, widely used

3 methods to convert EML to PST

Method 1: Drag & drop into Outlook

Select EML files in Windows Explorer and drag them directly into an Outlook folder. This works but is limited and manual.

Pros

  • ✓ Free
  • ✓ No software needed beyond Outlook

Cons

  • ✗ Manual process — impractical for hundreds of files
  • ✗ Doesn't create a PST file directly
  • ✗ Loses original folder structure
  • ✗ Windows + Outlook required

Method 2: Desktop conversion software

Several desktop applications can batch-convert EML files to PST locally. These paid tools typically cost between $29 and $199 per license.

Pros

  • ✓ Batch conversion support
  • ✓ Preserves metadata

Cons

  • ✗ Paid software ($29-$199)
  • ✗ Windows only
  • ✗ Installation required
  • ✗ Slow for large batches
Recommended

Method 3: MailtoPst (online, free trial)

Upload your EML files (or a ZIP of EML files) to MailtoPst, select PST as the output format, and download. No installation, works from any OS.

Pros

  • ✓ First conversion free
  • ✓ Batch support (ZIP upload)
  • ✓ Works on Mac, Windows, Linux
  • ✓ EU servers, GDPR compliant
  • ✓ Preserves all metadata and attachments

Cons

  • ✗ Requires internet connection
  • ✗ Paid credits after first conversion
Try MailtoPst free →

Step by step

How to convert EML to PST with MailtoPst

01

Upload your EML file

Drag & drop or click to upload your .eml file. Files up to 51 GB supported with resumable upload.

02

Choose PST as output

Select PST from the format dropdown. MailtoPst auto-detects the best conversion settings.

03

Download your PST file

Conversion takes seconds. Download your .pst file or receive it by email.

Convert your EML to PST now →

First conversion free. No credit card required.

FAQ

Frequently Asked Questions

Can I convert multiple EML files to a single PST?

Yes. MailtoPst supports batch conversion — upload a ZIP file containing all your .eml files, and they'll be merged into a single organized PST file.

Will attachments be preserved during conversion?

Yes. All attachments, inline images, read/unread status, timestamps, and email headers are fully preserved during the EML to PST conversion.

Can I convert EML files from Windows Live Mail?

Absolutely. Windows Live Mail stores emails as .eml files. Simply select them, zip them up, and upload to MailtoPst for conversion to PST.

Is the EML to PST conversion free?

Your first conversion is completely free with no credit card required. After that, credit packs start from €4.99 for 5 conversions.

How do I organize EML files into folders before converting?

Create a folder structure in your ZIP file — MailtoPst will preserve the directory hierarchy as PST folders. For example, put emails in Inbox/, Sent/, Archive/ directories.

What's the maximum number of EML files I can convert at once?

There's no limit on the number of files. The only constraint is the total upload size (up to 51 GB). We've processed archives with over 100,000 EML files.

Related conversions

EMLX → PST MBOX → PST MSG → PST OST → PST
See all 30 conversion paths →

Ready to convert your emails?

First conversion free. No credit card required.

Start converting → See pricing