Base64 Encoder & Decoder
Encode and decode Base64 strings instantly. Free, no signup, nothing stored.
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Frequently asked questions
What is Base64 encoding?
Base64 is a way to encode binary data as plain text using 64 characters (A-Z, a-z, 0-9, +, /). It is commonly used to transmit data over systems that only support text, like email or JSON APIs.
When should I use Base64 encoding?
Use Base64 when you need to embed binary data in text formats — for example embedding images in HTML/CSS, storing binary data in JSON, or sending files via email attachments.
What is the difference between Base64 and Base64URL?
Base64URL replaces + with - and / with _ to make the output safe for use in URLs and filenames. It also removes the = padding characters. JWT tokens use Base64URL encoding.
Does Base64 encrypt my data?
No! Base64 is encoding, not encryption. Anyone can decode a Base64 string without a key. Never use Base64 to secure sensitive data — use proper encryption instead.
Is my data safe when using this tool?
Yes. All encoding and decoding happens entirely in your browser — nothing is sent to our servers. Your data never leaves your device.