Base64 Encoder & Decoder Online

100% In-Browser & Private

Convert plain text strings into Base64 encoded format or decode Base64 strings back to UTF-8 text with instant client-side processing.

About Base64 Encoder & Decoder

Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format using a radix-64 representation. It is standard for transmitting credentials in HTTP Basic Auth, embedding small image assets into CSS/HTML data URIs, and passing binary payloads through email (MIME) and REST APIs.

Key Features & Capabilities

Two-way real-time Base64 encoding and decoding
Full UTF-8 character and Unicode string support
Real-time validation with invalid Base64 string alerts
Completely private: runs entirely in your local browser sandbox

How to Use This Tool

  1. 1

    Input your string

    Paste the plain text into the Input box to encode, or paste Base64 text into the Output box to decode.

  2. 2

    Review result

    The converted output appears immediately.

  3. 3

    Copy to clipboard

    Click the copy icon to copy your converted string.

Frequently Asked Questions

What is Base64 encoding used for?

Base64 ensures that binary data remains intact during transport through text-based protocols (like email, HTTP headers, or XML/JSON payloads) without data corruption.

Is Base64 considered encryption?

No. Base64 is an encoding format, not encryption. Anyone can decode a Base64 string without a password or key.

Client-Side Security Guarantee: All operations are processed locally in your browser sandbox using web standards. We never record, send, or store your code, data payloads, or tokens on any server.