Base64 Encoder/Decoder
Encode and decode Base64 strings with professional formatting options. URL-safe encoding, MIME/PEM formats, and more.
No output yet
Enter your text and configure options, then click to encode or decode
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Base64 encoder/decoder FAQs
What is Base64 encoding?
Base64 is a binary-to-text encoding scheme that converts binary data into ASCII string format using 64 printable characters. It's commonly used for transmitting data over text-based protocols.
When should I use URL-safe Base64?
URL-safe Base64 replaces + and / with - and _ respectively, making the encoded string safe for use in URLs and filenames without encoding special characters.
What's the difference between MIME and PEM formats?
MIME format breaks Base64 output into 76-character lines, while PEM format uses 64-character lines. Both formats are commonly used for encoding certificates and keys.
Why does Base64 encoding increase data size?
Base64 encoding increases data size by approximately 33% because it represents 6 bits of data using 8 bits (one ASCII character). This trade-off ensures safe transmission over text-based systems.
Is my data secure when using this tool?
All Base64 processing happens server-side and your data is never stored or logged. However, Base64 is encoding, not encryption - it doesn't provide security or confidentiality.