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Base64 Encoder & Decoder

Quickly encode text to Base64 or decode Base64 back to text strings. 100% client-side privacy.

Text Input

Base64 Output

How Base64 Encoding Works (RFC 4648)

Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format. It divides binary sequences into 6-bit chunks, where each chunk maps directly to one of 64 printable characters (A-Z, a-z, 0-9, +, and /). It is designed to safely transmit data across media and protocols that are designed to handle textual information without corruption.

Standard Base64

Uses + and / characters with = padding at the end to ensure 24-bit alignment.

URL-Safe Base64

Replaces + with - and / with _ so the encoded string can be used inside URL parameters and filenames without percent-encoding.

Data Expansion Overhead

Base64 increases data size by approximately 33% (4 output bytes for every 3 input bytes).

Command-Line Quick Reference

Encode and decode strings or files natively from your shell:

# Encode a string in Linux or macOS:
echo -n "Hello, World!" | base64

# Decode a Base64 string in Linux:
echo -n "SGVsbG8sIFdvcmxkIQ==" | base64 -d

# Decode a Base64 string in macOS:
echo -n "SGVsbG8sIFdvcmxkIQ==" | base64 -D

Frequently Asked Questions

Is Base64 a form of encryption?+

No. Base64 is an encoding format, not encryption. It does not use keys and offers zero cryptographic security. Anyone can immediately decode a Base64 string back into the original data.

What are the padding equal signs (=) at the end of Base64?+

Base64 processes input in 3-byte blocks. If the input data is not an exact multiple of 3 bytes, one or two = characters are appended as padding to complete the final 4-character output group.

Is my input text uploaded or logged?+

Never. All encoding and decoding operations run 100% locally in your browser sandbox using native browser APIs. Zero data is transmitted to EasyLauncher servers.

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