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BSAOpt

BSAopt is a free, open-source Windows utility for managing and recompressing BSA archives.

Place
#18 of 25
Score
5.8
BSAOpt's website

What BSAOpt is

BSAopt is a free, open-source Windows utility for managing and recompressing BSA archives. It treats archive contents like directories, which makes files inside easier to address, and can deduplicate files. Depending on the selected input and output, users can copy, pack, unpack, or convert archives. The listing says its compression can be roughly 5% better for files and 20% better for WAV files. BSA and ZIP are listed as supported formats, with archive extraction and mod packaging also supported. The version history includes Morrowind support, Fallout compatibility, and Xbox-type archives; version 1.6.3 added recognition for XWM, FUZ, OGG, GID, and PEX files. Optional logs and a dialog that can attempt recovery from corrupt BSA headers are listed as well. BSAopt is partially multi-threaded and supports 32-bit and 64-bit Windows Vista or later. With UAC enabled, it must be run as administrator. The repository names Ethatron as project owner and says BSAopt was forked from NIFopt. Its license is available under either the Mozilla Public License 1.1 or GNU Library GPL version 3. The listed version is 1.6.3, last updated 14 January 2013.

Good

  • Free and open source
  • Can deduplicate files in BSA archives
  • Copy, pack, unpack, and convert operations
  • Optional logs and corrupt-header recovery attempt

Watch out

  • Windows Vista or later required
  • UAC-enabled users must run it as administrator
  • Listed version 1.6.3 was last updated 14 January 2013

Who it suits

BSAopt suits Windows users managing BSA or ZIP archives, including people packaging or extracting game mod files. Its listed game and archive support may be relevant to users working with Morrowind, Fallout, or Xbox-type archives.

Verdict

BSAopt provides archive management and recompression tools at no cost, with several game-related formats and recovery features listed. Its Windows requirement, administrator step under UAC, and old listed update date are worth weighing.

Plans and prices

From BSAOpt's own pricing page, checked 9 Oct 2026.

All about pricing
PlanPriceWhat it gives you
BSAoptFreeNo paid plans stated

The facts

Each one read from BSAOpt's own pages, with the date it was checked.

What it does

Archive operations
The source code exposes Copy, Pack, Unpack, and Convert operations based on the selected input and output.checked 9 Oct 2026
Compression
The listing says it can compress files roughly 5% better and WAV files 20% better.checked 9 Oct 2026
Current listed version
The Nexus Mods listing identifies version 1.6.3, last updated 14 January 2013.checked 9 Oct 2026
Deduplication
The product listing says BSAopt can deduplicate files in BSA archives.checked 9 Oct 2026
File type support
Version 1.6.3 added recognition for XWM, FUZ, OGG, GID, and PEX files.checked 9 Oct 2026
Formats and games
The version history lists Morrowind support, Fallout compatibility, and Xbox-type archive support.checked 9 Oct 2026
License
The source file states it is available under either the Mozilla Public License 1.1 or GNU Library GPL version 3 terms.checked 9 Oct 2026
Logging and recovery
The version history lists optional log files and a broken-header dialog that can attempt recovery of files from corrupt BSAs.checked 9 Oct 2026
Purpose
BSAopt manages and recompresses BSA files, treating them like directories so files inside can be addressed easily.checked 9 Oct 2026
Threading
The listing describes the application as partially multi-threaded.checked 9 Oct 2026
UAC requirement
The listing says users with UAC enabled have to run BSAopt as administrator.checked 9 Oct 2026

The company

Maker
The repository identifies Ethatron as the project owner and describes BSAopt as forked from NIFopt.checked 9 Oct 2026

Where it runs

Supported Windows versions
The listing says BSAopt requires Windows Vista or later and supports 32-bit and 64-bit Windows.checked 9 Oct 2026

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