Game Save Editor for RPG Maker & Ren'Py

Most games store a save as structured data, only the wrapper differs. RPG Maker MV and MZ compress ‎.rpgsave‎ and ‎.rmmzsave‎ files with zlib, some engines use gzip, and Ren'Py writes the whole game state as a Python pickle. This tool strips those layers so you get a readable tree of keys instead of an unreadable blob. Drop the file in, the format is detected automatically, and every value becomes an editable text field; an edit lands in the data immediately and the value type (number, boolean, string, null) is preserved. The search box filters branches by key name or by value, ＋ creates a new key, and ✕ removes a key or a whole branch. When you want the whole document instead, the raw JSON mode shows it with an apply button. Export re-encodes the data with the original wrapper, zlib, gzip or base64, so the game can read it back. One limit is worth knowing up front: a Python pickle and a Godot ‎.cfg‎ cannot be rebuilt byte for byte in a browser, so those two are handed back as JSON (the pickle under an ‎.edited.json‎ name) and your original save is left untouched. Everything runs in the browser, the file is never uploaded, and a pickle is parsed, never executed.

This tool runs entirely in your browser. No data is sent to any server.

How to use it

1. 1

   Back up your save file first, then drop it into the box (or click to pick it from your computer).

2. 2

   Check the detected format at the top and edit values in the tree; use search to jump straight to the key you want.

3. 3

   Press export, download the new file and put it back into the game’s save folder under the original name.

Frequently asked questions

Which formats are detected?

Plain JSON, zlib-compressed JSON (RPG Maker MV and MZ saves), gzip, a Ren'Py pickle either raw or inside zlib, a Unity Easy Save 3 file (whose value/type wrapper is unwrapped), a Godot ‎.cfg‎, and any of those wrapped in base64. JSON that appears after a few lines of engine header is found too.

Why did my Ren'Py save come back as JSON instead of the original file?

Because a pickle is Python’s serialization format and cannot be rebuilt exactly in a browser without the Python runtime. Rather than hand you a file the game would refuse to load, the edited data is exported as JSON with a ‎.edited.json‎ name, so your original save stays intact.

Is editing a save file risky?

Two risks. If you change the wrong value you can break your progress, so always keep a backup. And in online games, or games that sync saves with a server, tampering with a save breaks the rules and can get the account banned. Encrypted saves are not detected at all and show the unrecognized-format message.