Newly Available Typed arrays

Uint8Array base64 and hex conversion

The Uint8Array.fromBase64() static method and the toBase64() and setFromBase64() instance methods convert to and from base64 strings. Similarly, the Uint8Array.fromHex() static method and the toHex() and setFromHex() instance methods convert to and from hex strings.

Baseline Status: Achieved Newly Available on Sep 5, 2025 across core engines.

Desktop Browser Engine Support

Google Chrome

140

Supported

Mozilla Firefox

133

Supported

Apple Safari

18.2

Supported

Microsoft Edge

140

Supported

Mobile Browser Engine Support

Chrome Android

140

Firefox Android

133

Safari iOS

18.2

Specifications and References

Specification ↗ Specification ↗ Feature XML ↗

MDN Browser Compat Data Keys:

javascript.builtins.Uint8Array.fromBase64 ↗ javascript.builtins.Uint8Array.fromHex ↗ javascript.builtins.Uint8Array.setFromBase64 ↗ javascript.builtins.Uint8Array.setFromHex ↗ javascript.builtins.Uint8Array.toBase64 ↗ javascript.builtins.Uint8Array.toHex ↗