Free OST Converter
Convert to Any Format

OST (Offline Storage Table) is Microsoft Outlook's format for storing a local copy of your mailbox when you use Exchange or certain account types. The file uses the same binary structure as PST. OST to TXT conversion takes that offline cache and exports each email as plain text — a format any text editor can open, so you can view or archive messages without an email client.

Our free OST to TXT converter processes entirely on your device. You drop a .ost file, and the tool validates the header, scans for email-like content (From:, To:, Subject:, Date:, and body), then generates TXT output. All processing is private; nothing is uploaded.

Common use cases include archiving emails as plain text for long-term storage, compliance records, searching across emails in a text editor, or viewing Outlook cache on a machine without Outlook. Because the converter is private, you can use it on any operating system.

For full fidelity including all inline images and complex formatting, Outlook or a dedicated desktop OST tool may be needed. This tool extracts as much as possible on your device and is ideal for viewing and backup when you don't have Outlook available.