About Base64 Encoder / Decoder

Encode any text to Base64 or decode Base64 strings back to plain text in real time. Base64 is used everywhere: in data URIs for embedding images in CSS and HTML, in email attachments (MIME), in JSON Web Tokens, and in API authentication headers. This tool handles both encoding and decoding with a single click, making it indispensable for web developers and API integrators.

How to Use Base64 Encoder / Decoder

1. 1Paste your text into the input field
2. 2Click Encode to convert to Base64, or Decode to convert back
3. 3The result appears in the output panel — copy it with one click
4. 4For file content, encode the raw bytes first (upload via the file option if available)

When to Use Base64 Encoder / Decoder

• ▸Creating data URIs for embedding small images in HTML/CSS
• ▸Decoding Base64-encoded API responses and JWT payloads
• ▸Encoding credentials for Basic HTTP authentication headers
• ▸Inspecting the contents of Base64-encoded email attachments

Frequently Asked Questions

Is Base64 encryption?

No — Base64 is encoding, not encryption. It transforms binary data into ASCII text but provides zero security. Anyone can decode Base64. Use actual encryption (AES, RSA) for sensitive data.

Why does Base64 increase data size?

Base64 uses 4 characters to represent every 3 bytes of data, which increases size by approximately 33%. This is the tradeoff for making binary data safe to transmit in text-based protocols.