Base64 Encoder & Decoder

Encode text or files to Base64 format or decode Base64 strings back to their original form. All processing happens in your browser - your data never leaves your device.

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Quick Usage Guide
1. Choose Mode
Select Encode to convert text/files to Base64 or Decode to convert Base64 back.
2. Enter Data
Type or paste your text, or upload a file. For decoding, paste the Base64 string.
3. Convert & Copy
Click the convert button and copy the result. Use URL-safe option for URLs.

Understanding Base64 Encoding

What is Base64?

Base64 is a binary-to-text encoding scheme that represents binary data using 64 ASCII characters. It's commonly used to:

  • ✓ Embed images in HTML/CSS
  • ✓ Transmit binary data in JSON/XML
  • ✓ Encode email attachments (MIME)
  • ✓ Store binary data in text formats

URL-Safe Base64

Standard Base64 uses characters (+, /, =) that have special meaning in URLs. URL-safe Base64 replaces these:

  • ✓ + becomes - (hyphen)
  • ✓ / becomes _ (underscore)
  • ✓ Padding = may be omitted
  • ✓ Safe for URLs and filenames

Base64 Encoding Example

Original Text:

Hello, World!

Base64 Encoded:

SGVsbG8sIFdvcmxkIQ==

Base64 encoding increases the size by approximately 33% because it represents 3 bytes of binary data as 4 ASCII characters.

The Base64 Alphabet

Character Set Characters
Uppercase Letters A-Z (values 0-25)
Lowercase Letters a-z (values 26-51)
Digits 0-9 (values 52-61)
Special (Standard) + (62), / (63)
Padding = (used to pad output)

Common Use Cases

Data URI Scheme

Embed images directly in HTML:

<img src="data:image/png;base64,iVBOR..." />

Basic Authentication

HTTP Basic Auth header:

Authorization: Basic dXNlcjpwYXNz

Common Use Cases

Image Embedding

Convert images to Base64 data URIs for embedding directly in HTML, CSS, or JSON without external files.

API Data Transfer

Safely transmit binary data through JSON APIs, webhooks, or other text-based protocols.

Authentication

Encode credentials for HTTP Basic Authentication headers or decode JWT token payloads.

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