Open Outlook (.pst) email archives directly in your browser - completely free, no Outlook or Microsoft account needed. Browse the full folder tree, read messages with formatting, download attachments, search by sender or subject, and export a CSV index of the whole mailbox. OST offline files are supported experimentally. Have single messages or other mailboxes? Try our EML / MSG Viewer, MBOX Viewer, or browse all file viewers.
or click to browse - works without Outlook installed
Drag and drop your .pst or .ost archive onto the upload area, or click to browse - Outlook exports, old email backups, and e-discovery files all work. Up to 300 MB, opened locally in your browser.
The complete folder tree appears in the sidebar with message counts - Inbox, Sent Items, and every custom folder. Click a folder to list its messages, then click any message to read it with formatting, sender details, and dates. Remote tracking images are blocked automatically.
Download attachments individually or grab them all as a ZIP, search messages by sender or subject, and export a CSV index of the entire archive - one row per message, ready for Excel or Google Sheets.
Inbox, Sent Items, Deleted Items, and every custom folder - with message counts, exactly as structured in Outlook.
Messages open with their HTML formatting, sender and recipient details, and dates - like a real mail client.
Download any attachment with one click, or grab every attachment of a message as a single ZIP archive.
Remote images are blocked automatically, so senders cannot tell you opened an old message - scripts are stripped too.
Filter the loaded messages instantly by sender or subject to find what you came for.
One row per message - folder, date, sender, subject, attachments - for audits, e-discovery, and mailbox cleanups.
Both ANSI and Unicode PST files open, and OST offline data files are supported experimentally.
Your mailbox is parsed entirely in your browser and never uploaded - the only sane way to inspect email archives online.
PST (Personal Storage Table) is Outlook's archive format - a single file holding folders, emails, attachments, contacts, and calendar items. PST files turn up everywhere: old email backups, departing-employee archives, Outlook exports, and e-discovery deliveries. The catch is that opening one normally requires a full Outlook install, which is exactly what a browser-based PST viewer removes.
OST is the offline cache Outlook keeps for Exchange and Microsoft 365 accounts. It shares most of its structure with PST, and this viewer opens it experimentally - most OST files browse fine, while some newer or encrypted variants may not. Both the legacy ANSI and the modern Unicode formats are handled, and Outlook's standard compressible encoding is decoded automatically.
An email archive is about as sensitive as files get, which is why this viewer never uploads anything - the entire archive is parsed in your browser. On top of that, remote images inside emails are blocked by default, since tracking pixels can notify a sender the moment a message is rendered.
For single exported messages use the EML / MSG Viewer, for Thunderbird and Gmail Takeout mailboxes the MBOX Viewer, and for exported contacts the VCF Viewer. The CSV index pairs nicely with the CSV Viewer, and the full collection is on the file viewers page.
Upload your .pst file here and browse it directly in your browser - no Outlook, no Microsoft account, no software install. The folder tree, messages, formatted email bodies, and attachments all open locally. Works on Windows, Mac, Linux, and Chromebooks.
PST (Personal Storage Table) is Outlook's archive format - a single file holding folders, emails, attachments, contacts, and calendar items. PST files are what you get from Outlook exports, old email backups, and e-discovery deliveries. Both the older ANSI and the modern Unicode variants open here.
Yes, with experimental support. OST is the offline cache Outlook keeps for Exchange and Microsoft 365 accounts - structurally similar to PST. Most OST files open and browse fine here; some newer or encrypted variants may not.
Yes - and for mailboxes this matters more than for any other file type. The archive is parsed entirely in your browser with JavaScript and is never uploaded to our servers. As an extra layer, remote images in emails are blocked automatically, since they can notify senders that a message was opened.
Yes. Open any message and its attachments appear as chips - click one to download it, or use the All attachments button to get them as a single ZIP archive.
It walks every folder and writes one row per message - folder path, date, sender, email address, subject, and attachment count - into a spreadsheet-ready CSV. Useful for audits, e-discovery, deciding what to keep from an old archive, or just getting an overview of a mailbox.
Browsers hold the whole archive in memory, so very large files are not practical here. In Outlook, use File > Open & Export > Import/Export to export selected folders into a smaller PST, or split the archive by date range, then open the pieces here.
Usually yes. Outlook's PST password protects access in Outlook but does not encrypt the content, and the standard compressible encoding is decoded automatically. Archives protected with third-party encryption tools cannot be opened. Still having trouble? Please contact us and we'll be happy to help!