Base64 Encode / Decode

Encode text to Base64 or decode Base64 back to text. Commonly used in data URLs, APIs, and encoding binary-like data as text.

About this tool

Base64 is an encoding scheme that turns binary or text data into a string of letters, numbers, and a few symbols. It is often used in data URLs, email attachments, and APIs where raw binary cannot be sent. Encoding is one-way in terms of readability; decoding restores the original.

How to use

Paste the text you want to encode, or a Base64 string you want to decode.
Click Encode to convert text to Base64 (e.g. for embedding in data URLs).
Click Decode to convert Base64 back to readable text.

When to use this tool

Creating data URLs (e.g. data:text/plain;base64,...) for embedding small assets.
Encoding binary-like data for APIs or config that expect text.
Decoding Base64 from API responses, emails, or certificates.
Obfuscating or transporting text in environments that only allow safe characters.

Tips

Standard Base64 uses A–Z, a–z, 0–9, +, and /. Padding uses =.
Encoding non-Latin text (e.g. emoji) may require UTF-8 encoding first; browser btoa expects Latin1. For Unicode, encode to UTF-8 bytes then Base64.

FAQ

Why does encoding fail for some text?: btoa() in browsers only accepts Latin1 (one byte per character). Characters outside that range (e.g. many Unicode symbols) cause an error. Use a UTF-8–aware encoder for full Unicode.
Is Base64 encryption?: No. Base64 is encoding—anyone can decode it. Do not use it to hide secrets; use proper encryption for that.