SMB4 toolsOverviewEditor v0.2.0

Tools for Super Mega Baseball 4 leagues

Edit players, ratings and rosters in your league saves, right in the browser. Nothing to install, and your files never leave your computer.

Tools

League Editor

Open any PC league file and change what the in-game editor makes slow.

Names, positions, handedness, pitcher roles, age and all eight ratings
Replace or sign players, with lineups and rotations kept in order
Export the whole league to CSV, edit it in a spreadsheet, import it back
Checks the file before every download

Open the League Editor💻 Desktop only — open on a PCFind your save file

Player	Pos	POW	CON	SPD
Rafael Ortega	SS	61	88	79
Wes Calloway	1B	92	70	34
Danny Pruitt	CF	55	74	90
Hector Lyle	C	68	63	22

Ratings Converter

Turn real stats into SMB4 ratings with a formula you can tune, then import them with the editor.

Open the Ratings Converter💻 Desktop only

Roster Updater

Bring a new roster into an existing league without starting your franchise over.

Open the Roster Updater💻 Desktop only

Find your save file

League editing works on PC. Console saves live on the console and can't be opened here. New to this? How to add a league to SMB4 (PC).

Close Super Mega Baseball 4The game holds league files in memory while it's running and can overwrite your changes.
Open the save folderPress Win + R, paste %LOCALAPPDATA%\Metalhead\Super Mega Baseball 4 and press Enter. Open the folder named with a long number; that's your account id.
Back up the league you want to editFiles named league-….sav are leagues. Copy the one you want somewhere safe before changing anything. Don't edit master.sav.
Open it in the League EditorMake your changes, download the edited file and copy it back over the original. The editor shows these steps again after each download.

Not sure which league file is which? Sort the folder by date modified; the league you played most recently is near the top, and the editor shows the league's name once it's open. Franchises are separate copies made when the franchise starts, so editing a league won't change a franchise already in progress. If a league file doesn't show up in-game, register it with the community SMB4 League Import Tool (LIT).

Changelog

League Editor 0.4.0October 22, 2026

Edit each player's uniform number — a new “No.” column, included in CSV import and export

League Editor 0.3.0October 19, 2026

Add or remove a secondary position for any player, not just change an existing one — works in the table and via CSV import

New toolsOctober 6, 2026

Ratings Converter — turn real stats into SMB4 ratings with tunable weights, matched to your league by name
Roster Updater — apply a new roster to an existing league in place, so franchises stay intact
Tools now require sign-in and a desktop browser

League Editor 0.2.0October 6, 2026

Export the league to CSV and import edits back, with a report of anything skipped
Downloads a ready-to-use .sav file instead of a zip
Runs an integrity check and verifies the compressed file before every download
Stops with a clear message if a game update changes the save format, instead of writing a broken file
Install steps after each download

League Editor 0.1.0October 5, 2026

First release: edit names, positions, handedness, pitcher roles, age and ratings
Replace and sign players between teams and free agency

Found a bug or want a feature?

Tell us what you were doing, which league file you used and what went wrong. Screenshots help. Please don't attach save files publicly.

Report it on Discord

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Tools

League Editor

Open any PC league file and change what the in-game editor makes slow.

Names, positions, handedness, pitcher roles, age and all eight ratings
Replace or sign players, with lineups and rotations kept in order
Export the whole league to CSV, edit it in a spreadsheet, import it back
Checks the file before every download

Open the League Editor💻 Desktop only — open on a PCFind your save file

Player	Pos	POW	CON	SPD
Rafael Ortega	SS	61	88	79
Wes Calloway	1B	92	70	34
Danny Pruitt	CF	55	74	90
Hector Lyle	C	68	63	22

Ratings Converter

Turn real stats into SMB4 ratings with a formula you can tune, then import them with the editor.

Open the Ratings Converter💻 Desktop only

Roster Updater

Bring a new roster into an existing league without starting your franchise over.

Open the Roster Updater💻 Desktop only

Find your save file

League editing works on PC. Console saves live on the console and can't be opened here. New to this? How to add a league to SMB4 (PC).

Close Super Mega Baseball 4The game holds league files in memory while it's running and can overwrite your changes.

Open the save folderPress Win + R, paste %LOCALAPPDATA%\Metalhead\Super Mega Baseball 4 and press Enter. Open the folder named with a long number; that's your account id.

Back up the league you want to editFiles named league-….sav are leagues. Copy the one you want somewhere safe before changing anything. Don't edit master.sav.

Open it in the League EditorMake your changes, download the edited file and copy it back over the original. The editor shows these steps again after each download.

Changelog

League Editor 0.4.0October 22, 2026

Edit each player's uniform number — a new “No.” column, included in CSV import and export

League Editor 0.3.0October 19, 2026

Add or remove a secondary position for any player, not just change an existing one — works in the table and via CSV import

New toolsOctober 6, 2026

Ratings Converter — turn real stats into SMB4 ratings with tunable weights, matched to your league by name
Roster Updater — apply a new roster to an existing league in place, so franchises stay intact
Tools now require sign-in and a desktop browser

League Editor 0.2.0October 6, 2026

Export the league to CSV and import edits back, with a report of anything skipped
Downloads a ready-to-use .sav file instead of a zip
Runs an integrity check and verifies the compressed file before every download
Stops with a clear message if a game update changes the save format, instead of writing a broken file
Install steps after each download

League Editor 0.1.0October 5, 2026

First release: edit names, positions, handedness, pitcher roles, age and ratings
Replace and sign players between teams and free agency