Base64 Encoder/Decoder
Instantly encode any text to Base64 or decode Base64 strings back to plain text. Handles full UTF-8 character sets including emojis and international characters. Useful for embedding data in URLs, emails, or API payloads.
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About Base64 Encoder/Decoder
## What is Base64?
**Base64** is a binary-to-text encoding scheme that represents binary data as an ASCII string. It uses 64 characters (A-Z, a-z, 0-9, +, /) to encode data, making it safe to transmit through systems that only support text.
### Common use cases
- **Data URIs** — embed images or fonts directly in CSS/HTML with `data:image/png;base64,...`
- **Email attachments** — MIME encoding uses Base64 to send binary files over SMTP
- **API authentication** — HTTP Basic Auth encodes `username:password` in Base64
- **JWT tokens** — JSON Web Tokens use Base64url encoding for header and payload
- **Embedding binary in JSON** — since JSON doesn't support binary data natively
### Good to know
- Base64 increases data size by roughly **33%** (3 bytes become 4 characters)
- Base64 is **not encryption** — it's trivially reversible and should never be used for security
- **Base64url** variant replaces `+` with `-` and `/` with `_` for URL-safe encoding
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