Base64•100% Client-Side

Base64 Encoder Online

Encode text strings or JSON payloads to Base64 format securely. Supports UTF-8 Unicode characters and URL-safe Base64 formatting options completely inside your browser.Reference Spec: IETF RFC 4648 (Base64 encoding standards)→

Plain Text Input
Base64 Encoded Result

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Frequently Asked Questions (Base64 Encoder)

What is Base64 Encoding?

Base64 is a binary-to-text encoding scheme that translates binary data (like files or images) or text into a sequence of 64 characters: A-Z, a-z, 0-9, +, and /. It is primarily used to transmit binary data over text-based protocols like HTML, email, or HTTP headers.

What is URL-Safe Base64?

URL-Safe Base64 replaces the characters '+' with '-' and '/' with '_', and omits the trailing '=' padding characters. This makes the resulting encoded string safe to use in URL paths, query parameters, or cookie values without escaping.

Does this encoder support Unicode/UTF-8?

Yes. Native Javascript btoa fails on non-ASCII characters. Our tool uses a TextEncoder pipeline to safely encode Unicode, emojis, and special international character alphabets into standard UTF-8 Base64 formats.

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