Base64 Encoder / Decoder
Encode text or files to Base64, decode Base64 back to text. URL-safe mode, MIME line-wrapping, and image preview included.
Base64 Character Sets
Standard Base64 (RFC 4648 §4)
A–Z · a–z · 0–9 · + · /
Padding: =
Default. + and / may require encoding in URLs.
URL-safe Base64 (RFC 4648 §5)
A–Z · a–z · 0–9 · - · _
Padding: =
Safe for URLs, filenames, and query strings without percent-encoding.
Size overhead
3 bytes→4 chars
100 bytes→136 chars (+36%)
1 KB→~1.37 KB
1 MB→~1.37 MB
FAQ
Frequently Asked Questions
Everything you need to know about this tool
Base64 is a binary-to-text encoding scheme that converts binary data (bytes) into a set of 64 printable ASCII characters (A–Z, a–z, 0–9, +, /). It is commonly used to embed binary data - like images, files, or cryptographic keys - inside text-based formats such as JSON, XML, HTML, or email (MIME).
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