Base64 Encode/Decode

Convert text to Base64 and back, instantly and privately — everything runs in your browser.

What is Base64?

Base64 is an encoding scheme that represents binary data as ASCII text using 64 characters (A-Z, a-z, 0-9, +, /). It’s widely used to transmit data over media designed for text (email, URLs, JSON).

Common uses

• Embedding images in HTML/CSS (data:image/png;base64,...)
• Authentication tokens (JWT payloads are Base64-encoded)
• Email attachments (MIME)
• Storing binary data in text-based formats

FAQ

Is Base64 encryption? No — it’s encoding, not encryption. Anyone can decode it. Use encryption (e.g. AES) for secrets.

Why does Base64 use more characters than the input? Base64 encodes 3 bytes into 4 characters, adding ~33% overhead.