# `GSFont legacyInfoKeys`

*Type Method*

Font info property names used by legacy file formats.

## Declaration

```swift
class func legacyInfoKeys() -> [String]
```

```objc
+ (NSArray<NSString *> *) legacyInfoKeys;
```

```python
legacyInfoKeys() -> list[str]
```

## See Also

### File Format

- [`GSFont.formatVersion`](/Core/GlyphsCore/GSFont/formatVersion) — The Glyphs file format version used to read and write the font.
- [`GSFont.storedFileType`](/Core/GlyphsCore/GSFont/storedFileType) — The package type recorded in serialized font data.
- [`GSFont.appVersion`](/Core/GlyphsCore/GSFont/appVersion) — The Glyphs app version that last wrote the font.
- [`GSFont filterLegacyDefaultProperties:filterKeys:format:`](/Core/GlyphsCore/GSFont/filterLegacyDefaultProperties:filterKeys:format:) — Filters default-language properties that cannot be represented in legacy formats.