Frequently Asked Questions
What is Base64 encoding?
Base64 is a binary-to-text encoding scheme that represents binary data using 64 printable ASCII characters (A–Z, a–z, 0–9, +, /). It is commonly used to encode binary data — such as images, files, or binary payloads — into a format safe for transmission in text-based contexts like email, JSON, URLs, and HTTP headers.
How to encode text to Base64
Select "Encode" mode, paste or type your plain text into the input panel, and the Base64-encoded result appears instantly in the output panel. Click Copy to copy the result to your clipboard. The encoder handles Unicode text (UTF-8) correctly, so international characters and emoji are encoded safely.
How to decode Base64
Select "Decode" mode, paste your Base64 string into the input panel, and the decoded plain text appears in the output panel. If the input is not valid Base64, an error message will explain the issue.
Is it safe to use an online Base64 encoder?
NexKit's Base64 encoder and decoder runs entirely in your browser using the native btoa() and atob() JavaScript functions. No data is sent to any server. This makes it safe to encode and decode sensitive strings such as API keys, tokens, or private data.