[Home](./index.md) > [@firebase/firestore](./firestore.md) > [lite](./firestore_lite.md) > [Bytes](./firestore_lite.bytes.md) > [toBase64](./firestore_lite.bytes.tobase64.md) ## Bytes.toBase64() method Returns the underlying bytes as a Base64-encoded string. Signature: ```typescript toBase64(): string; ``` Returns: string The Base64-encoded string created from the `Bytes` object.