What is Base64 encoding?

Base64 is a standard encoding scheme that represents binary data using 64 ASCII characters. It is used for transmitting data over systems that may not handle binary correctly.

Why do I need Base64 encoding?

Base64 is commonly used for: (1) API authentication headers, (2) embedding images/files in text formats, (3) transmitting binary data over text-only channels, (4) obfuscating data.

Can I use this with ChatGPT or Claude?

Yes! Ask: "Encode this text to Base64: [text]" and share this URL for quick conversions. AI models understand Base64 operations.

Is Base64 encoding secure?

No. Base64 is encoding, not encryption. It is reversible and can be decoded by anyone. For sensitive data, use encryption instead.

What characters can I encode?

You can encode any text, including special characters, Unicode, and binary data. The output will be standard Base64 (A-Z, a-z, 0-9, +, /).

How do I decode Base64 in my code?

Most languages have built-in Base64 functions: JavaScript (atob/btoa), Python (base64 module), PHP (base64_decode), Java (Base64.getDecoder).

b64

Base64 Encoder

Revision: April 15, 2026 • Encode and decode Base64 text locally

Encode and decode Base64 safely

Convert plain text to Base64 or decode Base64 strings instantly. This is helpful for data embedding, API testing, and secure data transport in text-only systems.

Input

Text or Base64

Output

🔒 Why This Tool Works in Your Browser

Base64 Encoder operates entirely in your browser, transforming your data locally without any server involvement. This means sensitive information—whether it's API credentials, configuration data, or personal details—never leaves your device during encoding or decoding operations. The processing happens instantaneously on your machine, giving you complete sovereignty over data transformation while maintaining total privacy. Base64 encoding is essential for developers, system administrators, and data handlers working with APIs, email systems, and data transmission protocols. This tool eliminates the security risks of using cloud-based encoding services that might log, store, or analyze your converted data. Whether you're encoding images for embedded data URIs, transforming binary data for API payloads, or debugging base64-encoded responses, everything happens locally with zero external visibility. The browser-based approach provides several critical advantages: immediate results without network latency, offline functionality that works anywhere, and complete transparency in the encoding process. You can inspect the source code to verify the algorithm, giving you cryptographic transparency that cloud services cannot match. There's no tracking of what you encode, no analytics on your data transformations, and no third-party access to your information. For developers handling sensitive business data, client information, or proprietary formats, this local processing ensures your encoding operations remain completely confidential and auditable.