Base64 Encoder/Decoder
Encode text to Base64 or decode Base64 strings instantly in your browser. 100% secure, client-side processing.
Secure, Client-Side Base64 Conversion
Our Base64 Encoder/Decoder operates entirely within your browser. Your data is never sent to a server. This makes it perfectly safe for encoding or decoding API keys, JWT tokens, basic auth credentials, and other sensitive information.
What is Base64 Encoding?
Base64 is a data encoding scheme that converts binary data (such as images, files, or non-ASCII text) into a printable ASCII string format. It's commonly used when transferring data across media that are designed to deal with textual data. This ensures that the data remains intact without modification during transport.
Common Uses for Base64
- Basic Authentication: HTTP Basic Auth requires headers to be formatted as
username:passwordand encoded in Base64. - Data URIs: Embedding small images or fonts directly into CSS or HTML files to reduce HTTP requests.
- Email Attachments: Email protocols (SMTP) were originally designed for text; attachments are often Base64 encoded to ensure safe delivery.
- JSON Web Tokens (JWT): JWTs consist of three parts (Header, Payload, Signature) that are Base64Url encoded.
Is Base64 Encryption?
No. Base64 is not encryption. It is simply a translation of data into a different format. Anyone with access to the Base64 string can instantly decode it back to the original text. Never use Base64 to secure or "encrypt" passwords or sensitive data at rest. For actual security, use cryptographic hashing (like bcrypt) or encryption algorithms (like AES).
URL-Safe Base64
Standard Base64 contains characters (+ and /) that have special meaning in URLs. When passing Base64 data in a URL query parameter or routing path, developers use a "URL-Safe" variant where + is replaced by - (dash) and / is replaced by _ (underscore).
The tools and calculators provided on The Simple Toolbox are intended for educational and informational purposes only. They do not constitute financial, legal, tax, or professional advice. While we strive to keep calculations accurate, numbers are based on user inputs and standard assumptions that may not apply to your specific situation. Always consult with a certified professional (such as a CPA, financial advisor, or attorney) before making significant financial or business decisions.
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