Open an .ost or .pst file

Read the messages and convert to PST, which opens in Outlook on any computer, without the original account. Everything runs here in your browser: the file is never uploaded to any server.

Drag the file here or click to choose .ost and .pst files of any size

Nothing to download or install
Your file never leaves your computer
The original is never modified

Where is the .ost file?

Close Outlook (while it is open, the file is locked).
In the file picker, paste into the address bar: %LOCALAPPDATA%\Microsoft\Outlook and press Enter. The folder is hidden, so it doesn't show up when browsing.
The .ost is named after the account, for example you@company.com.ost. .pst files are usually in Documents\Outlook Files.

Convert to PST: opens in any Outlook, without the original account.
Merge mailboxes: add other .ost and .pst files on the Convert screen.
Other formats: MBOX for Gmail and Thunderbird, contacts and calendar for your phone, and an archive to browse in any browser.
Save emails: one message or a whole folder as .eml, on the Browse screen.
Damaged file: if it won't open, use recovery mode.
The file is read only on your computer and is never modified. Free to open and read everything; the free conversion includes 25 messages per folder.

Folder

Select a message to read it.

How the file is laid out

Each column is a slice of the file, from start to end, read left to right. The colors show what fills each slice: indexes, data, structure or free space.

Convert to PST

Copies every folder and message into a new PST. You can merge several files into one and split the result into parts.

Source file

Format PSTOutlookWindows and Mac MBOXGmail, Thunderbird, Apple MailOne .mbox file per folder VCF · ICSContacts and calendarPhone, Google, iCloud PDFPDF for legal and HR with a licenseOne PDF per message, attachments inside, SHA-256 manifest HTMLArchive to browseOpens in a browser, no email app

Merge, split and other options

Merge with other files (optional)

Add file…

Folders with the same name are merged. A message repeated in the same folder is kept once; the copy from the file listed first wins.

Name shown in Outlook Include hidden folder items (views, rules, settings) Recovery mode, for damaged files: reads the whole file, rebuilds the indexes and also saves what is outside the folders (slower) Skip duplicate messages in the same folder Split into files of up to GB (blank = a single file)

I confirm the file is mine or that I am authorized to access and convert its contents.

The PST is first built in the browser's private storage, then you choose where to save it. Keep at least twice the size of the source file free on disk.

License

Free

Open, browse and read everything. Converts the first 25 messages of each folder, so you can check the quality in Outlook.

Per mailbox

Full conversion of the open mailbox, identified by the code below. Valid for 30 days, to convert again if needed.

Personal or professional

Full conversions of any file, with merge and split. Annual subscription that renews on its own; the new license is applied here automatically. Professional covers use on clients' mailboxes.