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Merge PST files into one.

Combine two or more PST files into a single file, with matching folders merged or each file kept in its own folder. Every message is accounted for.

Nothing uploadedEvery result verifiedOriginal never changed
PST

Drop the PST files to merge

Two or more. The first one is the base.

Read on this computerNothing uploaded
    Inbox goes with Inbox, Sent Items with Sent Items.
    The result is checked before you can save it.
    Working
    Elapsed 0 s · your file stays on this computer
    How it works

    3 steps, nothing to install.

    1

    Add the files

    Drop two or more PST files. The first is the base; the others are added to it.

    2

    Preview

    See how many messages the merged file will hold before anything is written.

    3

    Merge and save

    The new PST is written and every message reconciled with its source. To also remove duplicates, run Remove duplicates on the result.

    Verified, not assumed

    Checked before you save it.

    The engine checks its own work. The result is read back from storage and compared with your original, and the report you can download lists every check.

    Every message of every input is in the result, compared one by one
    Named properties remapped correctly between files
    The result opens in Outlook (tested with SCANPST and Outlook)
    The original files are unchanged
    FAQ

    Questions, answered.

    How do I combine PST files?

    Drop them above, choose whether matching folders are merged, preview, then merge. The result is one new PST.

    Will merging remove duplicates?

    Merge keeps every message. Run Remove duplicates on the merged file afterwards to keep one copy of each.

    Is my file uploaded?

    No. The engine runs inside your browser tab and reads the file from your disk. Results are written to your browser's private storage until you save them. Nothing is sent to a server.

    Will my original file be changed?

    Never. Every result is a new file, and the engine checks that the source is unchanged before it finishes.

    Related

    More PST tools.

    Remove duplicates

    Keep one copy of each message.

    21

    Split PST

    By size, year, month or folder.

    13

    PST Viewer

    Open and read the PST without Outlook.

    ViewPST