What's new since GSplit 3

GSplit 4 has a new interface and a new piece format, and keeps the layout you know from GSplit 3 (General, Pieces, Self-Uniting). This page tells what changed and what to check before you replace GSplit 3.

Compatibility at a glance

Need	Answer
Restore pieces made by GSplit 1.x, 2.x or 3.x	GSplit 4 and GUnite 4 read them.
Restore pieces made by GSplit 4 with GUnite 3	Not possible. Use GUnite 4.
Reuse a GSplit 3 project (`.gsc`)	Open it in GSplit 4 (see below).
Keep GSplit 3 installed	The installer leaves GSplit 3 in its own folder.

What changed

Self-Uniting app. GSplit 3 turned the first piece into a self-extracting EXE. GSplit 4 copies GUnite, a signed program, next to the pieces; the recipient runs it to get the file back. See Self-Uniting app.
Safer pieces. Each piece carries its own checksum, and the set carries the SHA-256 of the original file, checked when you unite it. See Piece format V4.
Tags are now metadata. You can still write pieces without it (Raw pieces on Other properties), but a Self-Uniting app needs it.
No Express mode. A split goes through the Source file, Destination and Split the file pages; see Getting started.
Settings in gsplit-pref.json. For a portable copy, put that file next to GSplit.exe (GSplit 3 used gsplitpref.xml). Check your choices in Options after the move. See Getting started.

New in GSplit 4

File checksum: CRC-32, MD5 and SHA-256 in one read, and a .sha256 file next to the pieces.
Command line: gsplitc splits and gunitec unites, without a window. GSplit.exe still accepts the GSplit 3 switches.
MCP server: AI agents can split and unite files.
Linux: GSplit runs on Linux with GTK 3.
Explorer context menu, including the Windows 11 menu.
Light and dark themes in Options, and eight languages besides English.

Move your GSplit 3 projects

Choose Open project… and pick a GSplit 3 .gsc file. GSplit 4 fills the pages from it and tells you which settings it could not carry over: the "a size per piece" mode, and a Self-Uniting app merged with the first piece or with a custom icon. Check each page, then save the project in the GSplit 4 format. See Project files and batch lists.