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Base64 Encoder & Decoder

Encode text to Base64 or decode Base64 back to text with our simple converter.

Base64 Encoder & Decoder

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How Base64 Encoding & Decoding Works

Base64 is a popular binary-to-text encoding scheme that represents binary data in an ASCII string format. By translating data into a radix-64 representation, it ensures that information remains intact during transmission across systems that may not support binary formats. Our online Base64 tool allows you to encode and decode strings or files instantly for seamless integration.

Common Developer Use Cases

  • Data URIs: Embed small images, icons, or fonts directly into HTML or CSS files to reduce HTTP requests.
  • API Authentication: Encode API tokens, basic auth credentials, and headers for secure web service communication.
  • Safe Data Transfer: Transmit binary files (like PDF or images) over text-only protocols like SMTP (Email) without corruption.
  • JSON/XML Storage: Safely store small binary snippets or encrypted data within text-based JSON or XML structures.
  • Web Development: Quickly preview how encoded strings will appear in your application source code.

Simply paste your text or upload a file to encode to Base64 or decode back to original format. Our tool ensures high-speed conversion with standard UTF-8 support.

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Frequently Asked Questions

Have a question? We’ve got answers to the most common questions about using our tools.

What is Base64?+
Base64 is a method to convert binary data (images, files, bytes) into a text string using only 64 safe characters (A–Z, a–z, 0–9, +, / and = for padding). It makes binary data safe to send or store in places that only understand text (like email, JSON, HTML).
How does Base64 encoding work? +
It takes every 3 bytes (24 bits) of binary data and splits them into four 6-bit groups. Each 6-bit number is mapped to one of the 64 characters in the Base64 alphabet. If the last group has fewer than 3 bytes, = padding is added.
Where is Base64 commonly used?+
Embedding small images in HTML/CSS (data URIs). Sending binary files (images, PDFs) via email (MIME). Storing binary data in JSON APIs. Basic authentication headers (username:password → base64). In JWT tokens, WebSockets, and many configuration files
Is Base64 encryption or secure?+
No — Base64 is not encryption. It is just an encoding scheme. Anyone can decode Base64 back to the original data instantly — it provides no secrecy or protection. It is only meant to make binary data text-safe, not secure.
How much bigger does data become after Base64 encoding?+
Base64 increases data size by approximately 33% (because 3 bytes become 4 characters). Example: A 300 KB image becomes roughly 400 KB after Base64 encoding.