Base64 Encoder
Encode and decode text in Base64 instantly in your browser.
Full UTF-8 support — emojis and special characters are preserved correctly.
What is Base64
Base64 is an encoding scheme that represents binary data (or text) using only 64 characters safe for text transmission: uppercase and lowercase letters, digits, and the symbols "+" and "/". It is not encryption — it does not protect content, it only converts it into a format that travels safely through text-only systems, such as emails, URLs, JSON, and XML.
It is used, for example, to embed images directly in HTML/CSS (data URIs), transmit attachments in email protocols like MIME, and encode credentials in HTTP Basic authentication headers. Since it is not a security measure, any Base64 text can be decoded by anyone instantly.
Frequently asked questions
Is Base64 a form of encryption?
No. Base64 is just an encoding — a way to represent data as text. Anyone can decode it back to the original value without a password or key. To protect sensitive data, use actual encryption, not Base64.
Why does Base64 text end up larger than the original?
Because every group of 3 original bytes is represented by 4 Base64 characters, increasing size by about 33%. That is the cost of guaranteeing the data travels safely in text formats.
Where is Base64 used in everyday systems?
In email attachments, images embedded in CSS/HTML (data URI), authentication tokens, storing binary data in JSON, and transmitting files in APIs that only accept text.