Base64 Encoder / Decoder
Encode text to Base64 or decode Base64 back to text.
What is Base64 Encoder / Decoder?
Base64 is an encoding scheme that represents binary data using a 64-character alphabet of ASCII letters, digits, and symbols. It converts every three bytes of binary data into four Base64 characters so that the result is safe to send as plain text.
Base64 is widely used because email protocols, URLs, and many text-based formats cannot carry raw binary data directly. Encoded text is slightly larger (about 33% more characters) but transports reliably across any system.
How does the Base64 Encoder / Decoder work?
Each 6-bit chunk of the input bytes maps to one of the 64 printable characters, and padding '=' characters are added so the encoded length is always a multiple of 4.
Decoding reverses the process: each Base64 character is mapped back to its 6-bit value and reassembled into the original bytes.
How to use the Base64 Encoder / Decoder?
- Type or paste the text you want to encode into the input box.
- Click Encode to convert it to Base64 output.
- To reverse the process, paste Base64 text into the input and click Decode.
- If the input is not valid Base64, the tool shows 'Invalid Base64 input'.
Example
Try the calculator with your own numbers
- Enter your values in the input fields above.
- Adjust the values to match your situation.
- The result updates instantly as you change the inputs.
Benefits of using the Base64 Encoder / Decoder
- Turns binary content into safe text for emails, JSON, URLs, and headers.
- Round-trips correctly with Unicode text thanks to UTF-8 encoding.
- Useful for debugging APIs, embedding images in HTML/CSS, and inspecting tokens.
Who should use the Base64 Encoder / Decoder?
- Students and professionals who need fast, accurate results.
- Anyone who wants to verify a manual calculation.
- People who prefer a quick answer over working it out by hand.
Tips for getting the most out of the Base64 Encoder / Decoder
- Double-check the values you enter before relying on the result.
- Use the calculator to verify manual calculations or estimates.
- Bookmark the page if you use it regularly.
Frequently Asked Questions
What is Base64 used for?
It is used to embed binary data — images, documents, authentication credentials — inside text-based systems such as email attachments (MIME), data URIs, JSON payloads, and URLs.
Does Base64 compress data?
No. Base64 always expands data by roughly 33%, because it packs 6 bits of data into each 8-bit output character.
Is Base64 encryption?
No, Base64 is an encoding, not encryption. Anyone can decode it, so it only makes data text-safe and should never be used to protect secrets.
Skip the manual working — enter your numbers into the Base64 Encoder / Decoder and get a clean result instantly, right in your browser.
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