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Game Hub / Save Reference

Subnautica Save Files & Tools

Subnautica PC save location, backup, file-format, launcher, cloud-sync, and compatibility reference. This Game Hub documents save-file facts without implying that a game-specific Save Editor is available.

PC

01 / Overview

Save reference at a glance.

Game Hubs separate documented save-file facts from actual Tool support. A Game Hub can be useful even when no custom editor exists.

Developer
Unknown Worlds Entertainment
Publisher
Unknown Worlds Entertainment
Platforms
PC
Save extensions
.bin, .json

Subnautica’s save unit is a slot directory. Each slot contains several records describing world and player state, which means a backup made from one selected file can be incomplete. The safest procedure is to close the game and copy the entire `SavedGames` directory or the complete slot you care about. Storefront matters because the base path can change—particularly between the standard game directory and the Epic LocalLow location.

For this PC reference, the documented storage is Windows: Standard Windows: <path-to-game>SNAppDataSavedGames
Epic: %USERPROFILE%AppDataLocalLowUnknown WorldsSubnauticaSubnauticaSavedGames | macOS: $HOME/Library/Application Support/unity.Unknown Worlds.Subnautica/Subnautica/SavedGames | Linux / Steam Play: Steam Play: <SteamLibrary-folder>/steamapps/compatdata/264710/pfx/. The known file or folder pattern is slot0000, slot0001, … save directories. Subnautica uses slot directories rather than one portable save file. A slot contains multiple binary/metadata records, so preserving the full slot folder is safer than selecting one .bin file.

Backup guidance: Copy complete slot directories or the entire SavedGames folder. Do not back up only the most obvious binary file inside a slot. Cloud support depends on storefront. The local slot directory should still be backed up before game updates, mods, or migration. Launcher and cloud context matters because PCGamingWiki documents different Windows locations for standard installs and Epic. Microsoft Store packaging should be treated separately when the standard SNAppData path is absent.

Compatibility and recovery should stay conservative. A slot folder is a coordinated set of files. Mixing parts from different slot revisions can create a state that was never produced by the game. If the expected progress is not visible, If the expected SNAppData directory is empty, identify the storefront and check the documented Epic LocalLow path. Keep older slot copies intact while diagnosing. SaveEditor.com only labels a game-specific editor as available when a separate linked Tool has a verified operational runtime; this reference page by itself is not an editor claim.

Compatibility note

A slot folder is a coordinated set of files. Mixing parts from different slot revisions can create a state that was never produced by the game.

02 / Save locations

Where the save files are stored.

Paths are displayed only when they have been explicitly documented for this Game Hub. Environment variables and launcher-specific differences should remain visible instead of being silently normalized.

Windows
Standard Windows: <path-to-game>SNAppDataSavedGames
Epic: %USERPROFILE%AppDataLocalLowUnknown WorldsSubnauticaSubnauticaSavedGames
macOS
$HOME/Library/Application Support/unity.Unknown Worlds.Subnautica/Subnautica/SavedGames
Linux
Steam Play: <SteamLibrary-folder>/steamapps/compatdata/264710/pfx/

Launcher / edition differences

PCGamingWiki documents different Windows locations for standard installs and Epic. Microsoft Store packaging should be treated separately when the standard SNAppData path is absent.

03 / File format

Files, extensions, and format notes.

This section documents only known file names and structures. Format notes can later connect directly to SaveEditor.com parsers, checksum engines, and converters.

Extensions

.bin .json

File names / patterns

  • slot0000
  • slot0001
  • ... save directories

Format notes

Subnautica uses slot directories rather than one portable save file. A slot contains multiple binary/metadata records, so preserving the full slot folder is safer than selecting one .bin file.

Launchers / stores

Steam / Epic Games Launcher / Microsoft Store / Xbox app

Cloud save notes

Cloud support depends on storefront. The local slot directory should still be backed up before game updates, mods, or migration.

04 / Tools

Actual linked Tool support.

No verified game-specific Save Editor is currently listed. This Game Hub remains useful for save locations, file details, backup guidance, and other linked utilities.

No active game-specific Tool is currently listed.

Planned and deprecated Tool records are intentionally excluded. The save-reference information on this page remains separate from Tool availability.

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05 / Backup

Protect the original before editing.

Save editing should be reversible. Keep an untouched copy outside the active save directory before replacing, converting, repairing, or modifying a save.

  1. 01
    Close the game.

    Avoid modifying a save while the game or launcher may still be writing to it.

  2. 02
    Copy the entire relevant save set.

    Some games use multiple files, profile folders, metadata, or companion files rather than one isolated save.

  3. 03
    Store the backup elsewhere.

    Use a separate folder or archive so cloud sync or the game cannot overwrite the untouched backup.

  4. 04
    Edit a copy, then validate.

    Follow the exact compatibility and processing notes on the Tool page before replacing the active save.

Game-specific backup note

Copy complete slot directories or the entire SavedGames folder. Do not back up only the most obvious binary file inside a slot.

06 / Troubleshooting

When a save is missing or rejected.

Start with reversible checks. Do not delete or overwrite the only copy while diagnosing a path, cloud-sync, version, or format problem.

Game-specific notes

If the expected SNAppData directory is empty, identify the storefront and check the documented Epic LocalLow path. Keep older slot copies intact while diagnosing.

A

Confirm the correct profile.

Games, launchers, and operating systems may keep separate save folders for different users, editions, or profiles.

B

Check cloud synchronization.

A cloud service can restore an older file or overwrite a local change. Preserve both copies before resolving a conflict.

C

Check Tool compatibility.

A matching filename does not prove a matching format. Verify platform, game version, extension, and Tool support state.

D

Restore the untouched backup.

If the game rejects a modified save, return to the original backup before attempting another change.

07 / FAQ

Subnautica save-file questions.

Answers are generated only from visible Game Hub metadata and actual linked Tool states, plus universal backup guidance.

Where are Subnautica save files stored?

The currently documented save locations are listed in the Save locations section above. Use the location that matches your platform or environment.

What save-file extension does Subnautica use?

The extensions currently documented on this page are: .bin, .json.

Does SaveEditor.com have a verified Subnautica Save Editor?

No verified game-specific Save Editor is currently listed. This Game Hub remains useful for save locations, file details, backup guidance, and other linked utilities.

Should I back up the save before using a Tool?

Yes. Keep an untouched copy outside the active save directory before modifying or converting the file. Some games use multiple companion files, so back up the relevant save folder when in doubt.

Are there cloud-save considerations for Subnautica?

Cloud support depends on storefront. The local slot directory should still be backed up before game updates, mods, or migration.

Editorial review

Game-specific metadata on this hub was last reviewed on 2026-08-08. Individual Tool pages maintain their own verification dates and compatibility notes.

Verification notes

Standard Windows, Epic, macOS, and Steam Play locations were reviewed against current PCGamingWiki coverage.

Reference sources
  1. Reference 1 - www.pcgamingwiki.com

Related guides

Continue with reviewed save-file guidance.

Only reviewed, index-ready Guides explicitly related to this Game Hub are surfaced here.