Local MBOX browser

Open an MBOX without importing it anywhere.

The archive is indexed progressively in a background worker. Search and open messages while the original mailbox stays on your device.

Workspace status

Ready · Local browser memory

Open an email file

Open it once. Reader, safety, headers, route, redaction, and export reuse the same in-memory source.

.EML
.MSG
.EMLX
winmail.dat
Processed locally. Files and filenames stay on this device.
Workflow

From source file to finished result

Runs locally
  1. Step 1

    Drop the MBOX archive

  2. Step 2

    Search while the local index is built

  3. Step 3

    Open or export matching messages

What this workspace preserves

Processes the file incrementally

Keeps the interface responsive

Supports sender and attachment filters

Questions about this workflow

Can it open a multi-gigabyte MBOX?

The indexer reads the File in chunks and keeps message offsets instead of loading the full archive into JavaScript memory.

Is the mailbox uploaded?

No. The original File remains local and message slices are parsed in a browser worker.