Base64 Encoder & Decoder

Essential

Encode and decode plain text, URLs, and data URIs to and from Base64 format.

Source Text / Data
Converted Result
UTF-8 international characters and symbols fully supported.

How to Use Base64 Encoder & Decoder Online

  1. Choose your operation: "Encode" to convert text to Base64, or "Decode" to extract text from Base64.
  2. Type or paste your content into the source box.
  3. The converted output updates instantaneously.
  4. Copy the resulting string with one click.

Key Features & Capabilities

  • Support for full UTF-8 international characters and emojis
  • Standard Base64 and URL-safe Base64 modes
  • Instant real-time conversion with character and byte count
  • File to Base64 data URI conversion support
  • One-click copy, swap input/output, and clear buttons

Frequently Asked Questions

Yes! Unlike standard browser btoa/atob functions that break on non-ASCII symbols, FeieSoft uses a full UTF-8 byte stream encoder to handle accents, emojis, and non-Latin alphabets flawlessly.

Base64 is used to encode binary data into an ASCII string format. It is widely used in email (MIME), embedding images directly into HTML or CSS (Data URIs), storing complex data in XML or JSON, and HTTP Basic Authentication.

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