Base64 Encoder & Decoder: When and How to Use
9 min read
Base64 encoding turns binary data or text into a string of safe ASCII characters. You see it in data URLs, API tokens, and email attachments. Knowing when to encode or decode saves time and avoids broken links or payloads.
What is Base64?
Base64 uses 64 characters (letters, digits, and two symbols) to represent any data. Three bytes of input become four characters of output. The result can be sent in JSON, URLs (with care), or headers where raw binary would cause problems.
When to encode
- Embedding small images in HTML or CSS as data URLs.
- Sending file content or tokens in JSON APIs.
- Storing or passing credentials in environments that expect text.
When to decode
- Reading API responses or headers that return Base64.
- Recovering original content from a data URL or stored string.
Base64 is not encryption—anyone with the string can decode it. Use it for format and compatibility, not for hiding secrets. Our Base64 Encoder/Decoder works both ways in your browser; your data never leaves your device.