Base64 Encoder Decoder: Complete Guide for Developers

Base64 Encoder Decoder: Complete Guide for Developers Base64 encoding comes up constantly in web development: API authentication headers, JWT tokens, image data URIs, email attachments. Understanding it properly saves hours of debugging. What Is Base64 Encoding? Base64 converts binary data into a text-safe format using only 64 printable ASCII characters: A-Z (26) + a-z (26) + 0-9 (10) + + and / (2) = 64 characters = is used as padding It's an encoding, not encryption. Anyone can decode it. Don't use Base64 to "hide" data. Before encoding: Hello, World! After encoding: SGVsbG8sIFdvcmxkIQ== Base64 Encoder Decoder Online DevPlaybook Base64 Tool — encode and decode Base64 instantly in your browser. No server, no account, no data stored. Just paste your text or Base64 string and click Encode or Decode. How to Encode/Decode Base64 JavaScript (Browser) // Encode btoa('Hello, World!') // "SGVsbG8sIFdvcmxkIQ==" // Decode atob('SGVsbG8sIFdvcmxkIQ==') // "Hello, World!" Important: btoa() and atob