If the game displays a loading error after editing, the file structure was likely broken during the export process. This happens if text characters were accidentally deleted or if a number format was changed into a text format. Restore your backup file and retry the edit using a different editor tool. Changes Do Not Appear In-Game
Because the data is compressed, opening an .rmmzsave file in a standard text editor like Notepad will only display unreadable strings of characters. You have two primary methods to read and edit the data: online web tools or manual decoding. Method 1: Using Online RMMZSAVE Editors (Recommended)
If playing an RMMZ game in a browser, the save data is stored in your browser's LocalStorage. You will need to use the browser's developer tools (F12) to export the data string. Step 2: Create a Backup (Crucial) rmmzsave editor
You do not need programming knowledge to edit RMMZ saves. Several free online and offline tools automate the decoding and encoding process.
Change gold counts, character levels, item quantities, or switches directly in the browser interface. If the game displays a loading error after
The allows players to modify internal game data by decoding the compressed .rmmzsave format into readable JSON. This is useful for adjusting character stats, inventory, and progression without needing the original game project files. Commonly Used Tools
RPG Maker MZ relies heavily on switches (True/False triggers) and variables (numerical values) to track story progression, quest completion, and world states. If a quest line is bugged and an NPC refuses to talk to you, you can look for the specific switch ID controlling that quest inside the save editor and toggle it from false to true . Changes Do Not Appear In-Game Because the data
// pseudocode const file = await readFile(input); let text = await file.text(); if (isBase64(text)) text = decompressFromBase64(text); const data = JSON.parse(text); // edit data... let out = JSON.stringify(data); if (originalWasCompressed) out = compressToBase64(out); downloadFile(out, 'Game.rmmzsave');
Because MZ uses standard JSON strings, advanced users can use tools like Visual Studio Code or online JSON minifiers/beautifiers to alter the text values manually, provided they know how to re-encode the file properly. Step 3: Modify and Replace Upload your file to your chosen tool.
Mitigations: