Base64 Encoder/Decoder

Encode text to Base64 or decode Base64 strings back to text.

Result

Fill in the fields above, then press Generate.

A Base64 encoder/decoder converts text and binary data to and from Base64 encoding, commonly used in emails, URLs, and API authentication.

Select encode or decode mode and enter your text. Encode converts plain text to Base64 format. Decode converts a Base64 string back to plain text. Supports UTF-8 characters.

Examples

Encode "Hello, World!"

Input: "Hello, World!" (13 chars). Output: "SGVsbG8sIFdvcmxkIQ==" (20 chars).

Decode "SGVsbG8="

Input: "SGVsbG8=" (8 chars). Output: "Hello" (5 chars).

Frequently Asked Questions

What is Base64 used for?
Base64 is used to encode binary data as ASCII text for transmission over text-based protocols. Common uses include email attachments (MIME), embedding images in HTML/CSS (data URIs), and encoding API tokens or credentials.
Is Base64 encryption?
No. Base64 is an encoding, not encryption. It does not provide any security. Anyone can decode a Base64 string. For security, use proper encryption algorithms like AES.
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Quick Tips

  • •Base64 output is always about 33% larger than the input, so avoid encoding large files unnecessarily.
  • •If you see trailing = or == in Base64, those are padding characters indicating the input was not a multiple of 3 bytes.
  • •Use Base64 for embedding small images in CSS or HTML via data URIs, but serve larger assets as separate files for better caching.