Base64 Encoder
Encode text to Base64 instantly. Free, no signup, runs in your browser.
How It Works
Type or paste any text into the input field and click Encode. The Base64-encoded result appears instantly below. Use the Copy button to copy it to your clipboard.
Everything runs in your browser. No server receives your text — encoding is done using JavaScript on your device.
What Is Base64 Encoding?
Base64 is a binary-to-text encoding scheme that represents binary data as an ASCII string. It is commonly used to embed images in HTML or CSS, transmit data in URLs, encode email attachments, and store binary data in JSON or XML.
Base64 encoding increases the size of the data by approximately 33%, but ensures the data can be safely transmitted through text-based systems without corruption.
Common Uses
Developers reach for Base64 to inline small images or fonts as data URLs so they load without an extra request, to embed credentials or tokens in configuration, to pass structured data through URL parameters, and to safely store binary content inside JSON, XML, or environment variables. Note that Base64 is an encoding, not encryption — it hides nothing, since anyone can decode it. For real secrecy, encrypt the data, and for storing passwords use a hashing tool instead.
Frequently Asked Questions
How do I encode text to Base64?
Paste or type your text into the input box and click Encode. The Base64 string appears in the output box below, and you can copy it with the Copy result button. It works instantly with no signup.
Does it support emoji and non-English characters?
Yes. The text is first converted to UTF-8 bytes with TextEncoder before being Base64-encoded, so accented letters, non-Latin scripts, and emoji all encode correctly rather than producing errors.
How do I decode Base64 back to text?
This tool only encodes text into Base64. To go the other way and turn a Base64 string back into readable text, use the companion Base64 Decoder tool linked below.
What is Base64 used for?
Base64 represents binary or text data as plain ASCII characters. It is commonly used to embed images in HTML or CSS via data URLs, send data in URLs and JSON, and encode email attachments. It typically increases the data size by about 33%.
Is my text sent to a server?
No. Encoding happens entirely in your browser with JavaScript's built-in functions. Your text is never uploaded, so it stays private on your device.