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Undertale save editor hero artwork for file0, undertale.ini files
❤️

Undertale Save Editor

The iconic indie RPG by Toby Fox where no one has to die. Edit your save files online for free.

Engine: GameMaker Format: file0, undertale.ini ✓ Free to Use
Start Editing Undertale Saves →

Verified In The Editor

No game-specific verified editor fields yet. Candidate and engine-level notes stay visible below.

Evidence status: candidate

Verified editor fields come from the evidence model only. Game-specific notes stay separate below.

View coverage proof

Game-Specific Editing Notes For Undertale

❤️

HP & LV

Change health and LOVE level

🎒

Inventory

Edit items in your inventory

💰

Gold (G)

Modify your money

📍

Save Location

Change your save point

🎮

Game Flags

Toggle story progression

👤

Character Name

Change the fallen human name

Compatibility & Common Failure Reasons

Best case

The file opens in Quick Edit, common fields are detected, and the download button is enabled.

Read-only mode

The file can be inspected, but export is disabled because this structure cannot be rebuilt safely in-browser.

Parse error

The file may be encrypted, compressed by a custom container, the wrong save file, or larger than the browser limit.

Support limits

  • Best results require the listed file0, undertale.ini file format.
  • Keep a backup before replacing your original save.
  • Encrypted, compressed, or game-specific containers may open read-only or fail to parse.

Failure reasons

  • Wrong file selected, such as a metadata, backup, or cloud placeholder file.
  • The game uses encryption, a checksum, or a custom container not exposed to the browser.
  • The file is too large or was edited while the game was still running.

Quick Edit Targets

Money Stats Flags

Backup steps

  1. Close the game before copying the save.
  2. Copy the original save folder to a separate backup location.
  3. Replace only one save slot first and verify in-game before making more changes.
Sources: Undertale save game data location , Undertale Steam Cloud metadata
Evidence-backed coverage proof

📂 Undertale Save File Location

Windows
%localappdata%\UNDERTALE
macOS
~/Library/Application Support/com.tobyfox.undertale/
Linux
~/.config/UNDERTALE

💡 Tip: Press Win+R on Windows and paste the path to quickly access your saves.

How to Edit Undertale Saves

1

Locate Your Save

Find your save file using the paths above. Make a backup copy first!

2

Upload & Edit

Drag your save file to our editor. Modify gold, items, stats and more.

3

Download & Play

Download your edited save and replace the original. Launch the game!

Open Undertale Editor

Frequently Asked Questions

Where are Undertale save files?
Windows: %localappdata%\UNDERTALE. Mac: ~/Library/Application Support/com.tobyfox.undertale/. The main files are file0 (save data) and undertale.ini (config).
How do I do a True Reset?
After a True Reset, the game treats you as a new player. You can edit your save to restore your previous state, or simply modify the "fun" value to see different events.
Can I change my FUN value?
Yes, edit the "fun" value in the `undertale.ini` file. This controls random events like the Gaster followers or the wrong number song.
Is it safe to edit the Genocide route?
Editing flags related to the Genocide route is possible but complex. Back up your `system_information_962` and `963` files before attempting significant changes.
Does this work with the Switch/PS4 version?
Directly, no. Consoles encrypt save files. However, if you can export your save (using a hacked console or cross-save tool) to PC format, you can edit it here.
What is file0?
file0 contains your actual save game data. Each line represents a game variable like HP, items, story flags, etc.
Can I change my route mid-game?
Yes! By editing game flags you can switch between Pacifist, Neutral, and Genocide routes.

📖 Related Guides

GameMaker Save Editing Guide

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Ready to Edit Your Undertale Save?

Free to use, no download required. Browser-side parsing with backup-first editing.

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Undertale Save File Editor (file0 & undertale.ini)

Undertale uses two main files for saving data: file0 (your active save slot) and undertale.ini (meta-data and persistent flags). Our editor can modify both.

Common Edits

  • Genocide/Pacifist Route: Reset or trigger route-specific flags to change the story path without replaying.
  • FUN Value: Edit the 'fun' variable in undertale.ini to trigger random events (like Gaster followers).
  • Battle Stats: Modify HP, ATK, DEF, and EXP to make battles easier or harder.

How to use

Simply upload your file0 to edit your current stats. To change "meta" events or reset the True Pacifist check, edit the undertale.ini file.