Base64 Encoder & Decoder

Convert text to Base64 encoding and decode Base64 strings back to plain text. Free and instant.

Input Text

Characters

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Words

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Output

Converted text will appear here

Characters

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Words

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Why Use Base64 Encoder & Decoder?

Data Transmission

Safely transmit binary data over text-based protocols like HTTP, email, and JSON without corruption.

Instant & Free

Convert unlimited text instantly. No sign-up, no waiting, completely free forever.

Unicode Support

Full support for Unicode characters, emojis, and text in any language with proper UTF-8 encoding.

What is Base64 Encoding?

Base64 is a binary-to-text encoding scheme that represents binary data using a set of 64 printable ASCII characters. It was designed to carry data stored in binary formats across channels that only reliably support text content.

The encoding uses characters A-Z, a-z, 0-9, plus (+), and slash (/), with equals (=) used for padding. This makes Base64 data safe to include in URLs, HTML, CSS, JSON, and other text-based formats without risk of corruption or misinterpretation.

Base64 Character Set

  • Uppercase:A-Z (26 characters, values 0-25)
  • Lowercase:a-z (26 characters, values 26-51)
  • Numbers:0-9 (10 characters, values 52-61)
  • Symbols:+ and / (2 characters, values 62-63)
  • Padding:= (used to pad output to multiple of 4 characters)

Common Use Cases for Base64

Data URLs

Embed images directly in HTML/CSS using data URIs, reducing HTTP requests and simplifying deployment.

Email Attachments

MIME encoding uses Base64 to safely transmit binary attachments through email servers.

API Authentication

HTTP Basic Authentication encodes credentials in Base64 for transmission in request headers.

JSON/XML Data

Safely include binary data in JSON or XML payloads without escaping issues or format conflicts.

URL Parameters

Encode complex data to pass safely in URLs without worrying about special characters.

Database Storage

Store binary data in text-only database fields when BLOB types aren't available.

How to Use the Base64 Encoder & Decoder

1

Enter Your Text

Paste plain text to encode or a Base64 string to decode.

2

Choose Your Action

Click "Encode to Base64" or "Decode from Base64" button.

3

View Results

See the converted text appear instantly in the output area.

4

Copy or Download

Copy to clipboard or download as a text file for later use.

Base64 Encoding vs Encryption

Important: Base64 is not encryption and should never be used for security purposes. It's a reversible encoding scheme, meaning anyone can decode Base64 data without any key or password.

Base64 Encoding

  • • Transforms data format
  • • Anyone can decode
  • • No key required
  • • Used for data transport

Encryption

  • • Protects data confidentiality
  • • Only key holders can decrypt
  • • Requires secret key
  • • Used for security

Frequently Asked Questions

What is Base64 encoding?

Base64 is a binary-to-text encoding that represents binary data using 64 printable ASCII characters. It's used to safely transmit binary data over text-based systems.

Why does Base64 make data larger?

Base64 increases data size by approximately 33% because it represents 3 bytes of binary data using 4 ASCII characters. This overhead is the trade-off for text-safe transmission.

Is this tool free to use?

Yes, completely free with no limitations, registration, or hidden costs. Encode and decode unlimited text anytime you need.

Does it support Unicode?

Yes! Our tool fully supports Unicode characters including emojis, special characters, and text in any language using proper UTF-8 encoding.

What's the = at the end of Base64?

The equals sign (=) is padding used to ensure the output length is a multiple of 4 characters. You might see one or two = signs depending on the input length.

Is my data secure?

All processing happens in your browser. Your text is never sent to any server, ensuring complete privacy for your data.