Base64 Encoder Decoder — Encode & Decode Base64 Online

B64

Base64 Encoder / Decoder

100% local · Nothing transmitted

URL-safe Base64

Plain Text Input

Hello, World! This is a Base64 encoding example.

Base64 Output

Invalid Base64 input. Please check your string.

Input: 0 chars

Output: 0 chars

Ratio: —

Base64 Explained

What is Base64 and what is it used for?+

Base64 is an encoding scheme that converts binary data to a text format using 64 printable ASCII characters (A-Z, a-z, 0-9, +, /). It is used to safely embed binary data inside text-based formats. Common uses: embedding images in CSS or HTML as data URIs, encoding attachments in emails (MIME), passing data through URLs, storing binary data in JSON, and HTTP Basic Authentication credentials.

What is URL-safe Base64?+

Standard Base64 uses + and / characters which have special meaning in URLs. URL-safe Base64 (RFC 4648) replaces + with - and / with _, making the output safe to use directly in URLs and filenames without percent-encoding. This variant is commonly used in JWT tokens, OAuth 2.0 flows, and any context where the Base64 string appears in a URL parameter.

Does Base64 make data secure?+

No. Base64 is an encoding, not an encryption. Anyone can decode a Base64 string instantly — there is no key or secret involved. It provides zero security. Its only purpose is to make binary data transmittable in text-only systems. For security, use proper encryption (AES, RSA) on top of Base64 if needed. Never use Base64 alone to "hide" sensitive information.