MetaData String Editor (Web)

A simple browser-based editor for the string-literal section of Unity IL2CPP global-metadata.dat files. Files are processed locally in the browser.

Features

• Opens real IL2CPP metadata files using the 0xFAB11BAF metadata header.
• Reads the string-literal table and string-literal-data section.
• Search and virtualized display for large string tables.
• Edit, revert, and export strings.
• Preserves the original file when no edits were made.
• Safely relocates the string-literal-data section when edited data no longer fits its original location.
• Validates offsets and lengths before reading.
• Re-parses the generated file before export and verifies every edited string.
• Refuses files larger than 512 MB in the browser.

Run

npm install
npm run dev

Production build:

npm run build

Important format note

Unity IL2CPP metadata files contain many metadata sections. This editor only changes the string-literal table and string-literal-data section; all other bytes are retained unless the string-literal-data section has to be moved because it grew beyond its original space.

The first header fields used here are:

• 0x00: sanity/magic 0xFAB11BAF
• 0x04: metadata version
• 0x08: string-literal table offset
• 0x0C: string-literal table byte length
• 0x10: string-literal data offset
• 0x14: string-literal data byte length

Each string-literal table entry is 8 bytes: a byte length followed by a byte offset relative to the string-literal-data section.

Compatibility with heavily modified, encrypted, or obfuscated metadata files is not guaranteed. The file must still expose a valid IL2CPP string-literal section.