Base64 Encoder / Decoder
Encoders & DecodersEncode plain text to Base64 and decode Base64 strings back to text instantly in your browser. No data is sent to any server.
Plain Text
Base64
About Base64 Encoder / Decoder
The Base64 Encoder & Decoder converts plain text to Base64-encoded strings and back. Base64 is widely used for encoding binary data in JSON payloads, data URIs, email attachments (MIME), and HTTP Basic Authentication headers. Everything runs entirely in your browser — your input never leaves your device.
Features
- ✓Encode any UTF-8 text to Base64 with one click
- ✓Decode Base64 strings back to their original text
- ✓Handles multi-line and Unicode input
- ✓Clear error messages for invalid Base64
- ✓Copy output to clipboard instantly
- ✓100% client-side — no server requests
Common Use Cases
- Encoding API credentials for HTTP Basic Authentication headers
- Generating data URIs for embedding small images or fonts in CSS
- Encoding binary data for safe transport in JSON or XML
- Decoding Base64-encoded JWT payloads for inspection
Frequently Asked Questions
QWhat is Base64 encoding?
Base64 is a binary-to-text encoding scheme that represents binary data using 64 printable ASCII characters (A–Z, a–z, 0–9, +, /). It increases data size by ~33% but ensures safe transmission over text-based channels.
QIs Base64 the same as encryption?
No. Base64 is encoding, not encryption. It provides no security — anyone can decode a Base64 string. It is used purely to ensure data is safely transportable as text.
QWhy does Base64 output end with = or ==?
The = padding characters align the output to a multiple of 4 characters, as required by the Base64 specification. One = means one padding byte was added, two == means two were added.