Base64 Encoder guide
Encode readable UTF-8 text to Base64 or decode Base64 back to text.
What this tool does
The encoder converts text into UTF-8 bytes and then represents those bytes using the standard Base64 alphabet. Decode mode reverses that process and uses strict UTF-8 decoding, so invalid Base64 or byte sequences are reported rather than silently producing replacement characters.
Base64 is useful when text or binary bytes need to travel through a text-only field, such as a data format, configuration value, or basic API payload. It increases size and does not provide secrecy, authenticity, or compression.
How to use it
- Choose Encode or Decode.
- Enter text in the input panel.
- Select the conversion button.
- Review the output for the expected text or encoded value.
- Copy the result using the browser-compatible copy control.
Benefits
- Supports Unicode text
- Strict UTF-8 decoding feedback
- Two-way encode and decode workflow
- Whitespace-tolerant Base64 input
Understanding Base64 output
Base64 uses four printable characters to represent every three bytes, so encoded output is commonly about one-third larger than the underlying data. Padding characters (=) may appear at the end when the byte count is not divisible by three. Removing required padding can make some decoders reject the value.
This tool is text-focused. Base64 that represents an image, archive, or other binary file may decode into bytes that are not valid readable UTF-8 text, and the tool will report that limitation.
Use the Base32 Encoder & Decoder when a system specifically requires the RFC 4648 Base32 alphabet. Base32 and Base64 are different encodings, so select the format named by the receiving protocol rather than choosing by appearance.