Save structure reference

Palworld save format: PlZ, PlM, CNK and GVAS explained.

A `.sav` extension does not describe one format. Palworld save files can contain an outer platform container, a compression layer, Unreal GVAS data, and Palworld-specific RawData with version-dependent structures.

Scan local files Try the safe sample

PlZZlib containerMagic appears after declared-size fields

PlMOodle containerCommon in newer saves and license-sensitive

GVASUnreal SaveGameThe decompressed structured layer

Local safety workbench

Run the same safety workflow on your local files.

Scan locally and export a receipt. Editing, diff, and validation are limited to the sample and Pal Save Editor JSON fixtures; every real binary input stays read-only.

0 B of save data uploadedLocal hashing and ZIP inspectionBlocked export on failed validation

What needs to happen?

Drop Level.sav, a world ZIP, or a Pal Save Editor JSON fixtureFor editing or transfer checks, include Level.sav and the Players folder. Choose local files

Find my save

Files never leave this tab Original input stays immutable Real binary writing is locked in this release

Local return loop

Save Chronicle

Receipt metadata lives only in this browser. Raw saves are never stored.

Your next local scan will appear here.

ReadyLocal workbench loaded.

The layers in a save

A common Steam or server file begins with declared sizes and a container marker such as PlZ or PlM. After decompression, the data begins with the Unreal `GVAS` signature. Palworld stores additional custom RawData inside that structure.

PlZ and CNK

PlZ uses zlib compression flags and is the easier container to open with permissive browser libraries. Game Pass can add a CNK-style outer wrapper before the inner Palworld container. Opening those layers still does not solve identity conversion or RawData writing.

PlM and Oodle

PlM uses Oodle compression. GPL implementations may be used commercially only while meeting their source and copyleft obligations; other public code or binaries have unclear or education-only terms. A static site distributes its WASM to visitors, so licensing and provenance must be reviewed per component.

Why round-trip is the minimum write test

A parser that can display JSON may still fail to serialize nested map types or preserve unknown regions. Before editing, an unchanged parse and rebuild should reproduce the same decompressed bytes or a documented equivalent that the current game loads.

SAFE

Task checklist

01Identify the outer container marker.
02Verify declared and actual sizes.
03Confirm the inner GVAS layer is fully consumed.
04Parse version-specific RawData with limits.
05Prove unchanged and changed round trips before writing.

FAQ

Questions people ask before touching the save

Is every Level.sav a PlZ file?

No. Newer saves commonly use PlM/Oodle, and Game Pass can include an additional CNK container.

Can I edit GVAS JSON and serialize it back?

Only if the parser understands the Palworld custom data and can prove a stable rebuild. Generic GVAS support alone is not enough.