NewA PST viewer that runs right in your browser

Open, repair and convert PST files.Without uploading a thing.

Mailtria works on your computer, inside your browser, on Mac, Windows or Linux. Every result is checked against the original before you save it.

Open a PST file for freeSee how it works
Nothing uploadedNo installFree previews
archive-2019.pst 5.26 GB
Read on this computer · nothing uploaded
Inbox2,316
Sent Items8,912
Projects1,204
Deleted Items214
Messages
AL
Q3 budget reviewAlex Lee
MR
Contract signed, final versionMaria Reyes
JS
Team offsite photosJamie Brooks
Contract signed, final versionMaria Reyes · 2 attachments · contract-final.pdf, pricing.xlsx
Contract signed, final version
MR
Maria Reyesto you · 11 Oct 2023, 16:42

Hi, attached is the signed contract and the final pricing sheet. Let me know once you've filed it.

PDF
contract-final.pdf
1.2 MB
XLS
pricing.xlsx
84 KB
Saved contract-final.pdf to Downloads
Health check 4 problems
old-archive.pst · 1.8 GB · Outlook says it “cannot be accessed”
Damaged data blocks38 blocks fail their checksum
Broken folder index“Projects” points to missing messages
Lost attachment tables6 messages can't list their files
Out-of-date free-space mapOutlook would refuse to write to it
58Health score
old-archive.pst
Recovered into a clean copy. Your original is never changed.
Messages recovered0 / 12,000
Folders rebuilt0 / 43
Unreadable, listed in report0
old-archive (repaired).pst · opens in Outlook
Convert archive-2019.pst
Choose where your mail is going
MBOXThunderbird · Apple Mail
EMLAny mail app · one file per message
Keep the folder structure
Include attachments
archive-2019-mbox.zip 0%
Inbox.mbox2,316 messages
Sent Items.mbox8,912 messages
Projects.mbox1,204 messages
Archive 2019.mbox41,077 messages
Deleted Items.mbox214 messages
Verified: every message matches the PST
Works with your mail apps

One engine between
every mailbox.

Bring mail in from one app and take it out to another. Mailtria sits in the middle and checks every message on the way through.

Bring mail from
O
OutlookClassic, 2013–2024
.pst
M
Microsoft 365 / ExchangeOutlook's offline file
.ost
G
Gmail TakeoutGoogle export
.mbox
T
ThunderbirdAny profile
.mbox
A
Apple MailExported mailboxes
.mbox
@
Any mail appSaved messages
.eml
S
Saved Outlook itemsDragged out of Outlook
.msg
Mailtria engine

Runs in your browser tab. Your files never leave your computer.

Reading 43 folders
Checking 120,000 messages
Writing the new format
Verifying against the original
Take it to
O
OutlookClassic and new Outlook
.pst
T
ThunderbirdImport in one step
.mbox
A
Apple MailFile › Import Mailboxes
.mbox
Z
A plain archiveReadable for decades
.eml
F
Files for a case or recordOne Outlook item each
.msg
Coming next .olm
Viewer Repair Split & merge Privacy
PST Viewer

No Outlook?
Open it anyway.

Browse folders, search every message and save attachments from any PST file, on a Mac, a Chromebook or a work laptop that never had Outlook.

  • Folders exactly as Outlook shows them
  • Search by sender, subject or text
  • Save any attachment in one click
Open the viewer
All foldersHas attachments2019
6 messages
Repair

When Outlook can't open it, we still can.

Repair reads every block it can still trust, rebuilds the folders and writes a clean new PST. Anything it can't save is named in the report, never quietly dropped.

  • Free health check before you decide
  • A new file. The original is never touched
  • Opens cleanly in Outlook afterwards
Check my PST for free
Scanning old-archive.pst
Each square is a part of the file. Red ones are damaged.
Mail dataDamagedRecovered
PST
old-archive (repaired).pst11,994 messages recovered · 6 listed in the report
Split & merge

Too big for Outlook?
Make it fit.

Cut an oversized PST into parts by size, year or folder, or join several into one, with duplicates removed. Every message lands in exactly one place.

  • Split by size, year, month or folder
  • Merge with folders matched or kept apart
  • Message counts checked on both sides
Split a PST
By sizeBy yearBy folder
archive-2019.pst · 5.26 GB
Merging instead? 3 files → 1, 4,210 duplicates removed
Privacy

Your mailbox never leaves your computer.

Most online PST tools ask you to upload years of private email. Mailtria brings the engine to your file instead, so there is nothing to upload and nothing for us to keep.

  • Zero bytes of mail sent to any server
  • Keeps working with Wi-Fi switched off
  • Results written straight to your disk
Read how it works
Processed on this computer0%
Sent to our servers0 B
Network upload: idle
Try it: load the page, switch off Wi-Fi, and it still works.
How it works

Four steps. No guesswork.

Drop your PST hereor choose a file · up to 50 GB
PST
archive-2019.pst
Inbox2,316
Sent Items8,912
Archive 201941,077
Projects1,204
Damage foundNone
Every block checksum is valid
120,000 of 120,000 messages identical
Folder tree matches the source
Original file unchanged
PST
archive-2019 (part 1).pst2.0 GB
PST
archive-2019 (part 2).pst2.0 GB
JSON
verification-report.json4 KB

Choose a file

Pick a PST, or a whole folder of EML and MBOX files. It is read straight from your disk. Nothing is uploaded.

Preview it for free

See every folder, the message counts and any damage before a single byte is written. No account needed.

Run it, then verify

Repair, split, merge, clean up or convert. Then every message is read back and compared with the original.

Save with a report

Download the result and a report with counts and checksums: proof of what was done. Your original stays as it was.

Get started for free
More tools

Everything else your PST needs.

Remove duplicates

Exact copies or same content, previewed before anything changes.

Re: Invoice #2231
Re: Invoice #2231 (copy)
Meeting notes, Monday
Meeting notes, Monday (copy)

PST to MBOX

Move from Outlook to Thunderbird or Apple Mail.

PSTMBOX

PST to EML

One file per message, in your folder structure.

PSTEML

Gmail Takeout to PST

Your Google mail, ready to open in Outlook.

MBOXPST

EML to PST

Turn a folder of saved messages into one Outlook file.

EMLPST

Health report

A free, detailed check of any PST, kept as a file.

{ "messages": 120000,
  "folders": 43,
  "problems": 0 }
Measured, not promised

Built for big, messy mailboxes.

From our published benchmarks, run on full-size test archives and checked by two independent PST readers.

0GBarchive opened and copied in Chrome
0messages in a single file, all verified
0bytesof your mail sent to any server
0tools on one engine, each checking its result
Pricing

Try it free. Pay when it worked.

Every preview is free. Make an account for 3 full runs on us.

Free

$0

See exactly what you'd get.

  • PST viewer and health check
  • Previews of every tool
  • 3 full runs with an account
Start free
Most popular

Pro

$49 one-time

For your own mailboxes.

  • Unlimited runs, every tool
  • Archives up to 50 GB
  • 1 year of updates
Get Pro

Technician

$199 one-time

For IT pros and support teams.

  • Use on client mailboxes
  • Command-line tool
  • Priority support
Get Technician
FAQ

Questions, answered.

Do you upload my PST file?

No. Mailtria runs entirely in your browser. Your file is read from your disk and results are written back to it. Our servers never receive your mail.

Can I open a PST file without Outlook?

Yes. The PST viewer lets you browse folders, read messages and save attachments on Mac, Windows, Linux or a Chromebook. No Outlook needed.

What if my PST file is damaged?

The free health check shows exactly what's wrong. Repair then recovers every message it can verify into a clean new file and lists anything it couldn't.

How large a file can it handle?

We've tested a 5.26 GB archive with 120,000 messages in Chrome. Larger files work as far as your browser's storage allows.

Get your mail back in minutes.

Free to try. Nothing to install. Nothing uploaded.

Choose a PST file