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DevKitData Encoding & FormattingBase64 Encoder/Decoder

Base64 Encoder / Decoder

Convert raw text into Base64 format or decode Base64 strings back into human-readable text entirely in your browser.

Raw Text
Base64 Output

Base64 Encoder & Decoder Online

Need to embed binary data in text formats like JSON or XML? Our free online Base64 Encoder & Decoder allows you to instantly convert ASCII strings or raw data into a Base64 encoded format, or decode existing Base64 strings back to their original human-readable text.

Fast & Local: This tool utilizes your browser's built-in btoa() and atob() functions. Your text is processed entirely offline, ensuring sensitive data is never transmitted across the network.

Core Features

  • Bidirectional ConversionSeamlessly toggle between encoding raw text to Base64 and decoding Base64 strings back to text. The tool handles the translation instantaneously as you type.
  • Safe Data TransportBase64 encoding translates all data into a standardized 64-character alphabet (A-Z, a-z, 0-9, +, /). This prevents data corruption when transferring text across systems that cannot handle raw binary or special characters.
  • Developer FocusedPerfect for debugging JWT payloads, embedding small images into CSS files, configuring basic authentication headers (e.g., Authorization: Basic ...), or bypassing firewall content filters.

Base64 Encoding Example

Raw Input Text
Hello, world! 🌍
Base64 Encoded Output
SGVsbG8sIHdvcmxkISDwn4yN
Security Warning: Base64 is encoding, not encryption. Anyone can easily decode a Base64 string. Do not use Base64 to secure sensitive data like passwords. Use Hashing or Encryption instead.

Related Tools

URL Encoder / DecoderPercent-encode text so it is safe to use within URLs and query strings.JWT DecoderDecode JSON Web Tokens (which heavily rely on Base64URL encoding).Symmetric EncryptionProperly secure sensitive data with AES-256 instead of just encoding it.

Categories

EncodingDevelopment

Frequently Asked Questions

Why do Base64 strings often end with "="?
The equals sign (=) is used for padding. Base64 processes data in chunks of 3 bytes (24 bits) which are converted into 4 6-bit Base64 characters. If your input text is not perfectly divisible by 3 bytes, the algorithm appends one or two = characters at the end to ensure the output length is a multiple of 4.
What is the difference between standard Base64 and Base64URL?
Standard Base64 uses the characters + and /, which can cause issues when passed within URLs as query parameters. "Base64URL" is a variant that replaces + with - (minus) and / with _ (underscore), and typically omits the = padding completely.