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Base64 encoder/decoder

Convert text to Base64, or decode a Base64 string back to text — both directions, one box.

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Text

Result
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How it works

Two steps, no account

1

Paste your text

Plain text to encode, or a Base64 string to decode — both go in the same box.

2

Pick a direction

Encode turns text into Base64; Decode turns Base64 back into readable text. Invalid Base64 input is reported, not silently dropped.

FAQ

Common questions

What is Base64 actually for?
It's an encoding, not encryption — a way to represent arbitrary binary or text data using only 64 printable ASCII characters, so it can safely travel through systems (email, URLs, JSON) that only handle plain text.
Does this support Unicode text, not just ASCII?
Yes — text is UTF-8 encoded before being converted to Base64, so accented characters, emoji, and non-Latin scripts round-trip correctly through Encode and back through Decode.
What happens if I decode something that isn't valid Base64?
The result shows "Invalid Base64 input" instead of garbage output, so it's obvious the decode failed rather than silently producing something wrong.
Is my text sent anywhere?
No. Encoding and decoding both run entirely in your browser using built-in JavaScript functions — nothing is transmitted, logged, or stored.
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Base64 Encoder/Decoder

Our Base64 Encoder/Decoder helps you convert text to Base64 encoding and decode Base64 strings back to text. Support for UTF-8 characters and instant conversion.

How to Use the Base64 Tool

1. Enter Your Text

  • Type or paste text in the input field
  • Choose encode or decode operation
  • View results instantly

2. Choose Operation

  • Encode: Convert text to Base64
  • Decode: Convert Base64 to text
  • Copy results with one click

3. Handle Results

  • View converted output
  • Copy to clipboard
  • Verify conversion accuracy

Key Features

Encoding Options

  • Text to Base64 conversion
  • UTF-8 character support
  • Instant encoding
  • Error handling

Decoding Options

  • Base64 to text conversion
  • Invalid input detection
  • Special character support
  • Automatic validation

Use Cases

1. Web Development

  • API data transmission
  • URL-safe data encoding
  • Image data handling
  • Cookie storage

2. Data Transfer

  • Email attachments
  • Binary data encoding
  • Cross-system compatibility
  • Secure data transfer

3. Technical Applications

  • Configuration files
  • Data storage
  • Authentication tokens
  • XML/JSON encoding

Technical Features

  • UTF-8 Support: Full character set
  • Real-Time Processing: Instant results
  • Error Handling: Invalid input detection
  • Clipboard Integration: Easy copying

Why Use Our Base64 Tool

1. User-Friendly Design

  • Simple interface
  • Clear options
  • Instant feedback
  • Easy copying

2. Reliable Conversion

  • Accurate encoding
  • Proper decoding
  • Error detection
  • UTF-8 support

3. Privacy Focused

  • Client-side processing
  • No data storage
  • Secure conversion
  • Offline capable

Understanding Base64

What is Base64?

Base64 is an encoding scheme that converts binary data into ASCII text format. It's commonly used to transmit binary data through text-based systems.

Common Applications

  1. Email Attachments: Encoding binary files
  2. Web Data: URL-safe data transmission
  3. Images: Inline image embedding
  4. APIs: Data transfer formatting

Best Practices

  1. Input Validation: Check data format
  2. Error Handling: Validate output
  3. Character Sets: Consider encoding
  4. Size Considerations: Account for expansion

Benefits

  1. Safe Transfer: Base64 uses a set of 64 characters that are safe for use in text-based systems
  2. Data Integrity: Ensures binary data remains intact during transfer
  3. Universal Support: Widely supported across different platforms and programming languages
  4. URL Safety: Can be used in URLs without special encoding

Technical Details

Base64 encoding converts every 3 bytes of binary data into 4 ASCII characters. If the input data length is not divisible by 3, padding characters ('=') are added to ensure proper decoding.

Remember: Base64 encoding increases data size by approximately 33%, but ensures safe transmission of binary data through text-based channels.