JustUtils
Private by designUTF-8 ready

Base64 Encoder & Decoder

Turn readable text into Base64—or decode it back. Works with emoji and international text, right in your browser.

What do you want to do?

Choose the output format

Type or paste any UTF-8 text.

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0 UTF-8 bytes

Base64 result

Updates instantly—no submit button needed.

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Your result will appear here
Try an example:
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Base64 without the mystery

Turn text into a portable representation, then get the original text back.

Base64 is useful when a system expects plain text but the value may contain bytes or characters that do not travel safely in that channel. Paste the value, choose the direction, and check the result before using it in an API request, configuration file, or debugging session.

  1. 01

    Choose the direction

    Use Encode for readable text. Use Decode only when the input is already a Base64 string.

  2. 02

    Paste the complete value

    Keep any trailing equals signs. They can be meaningful padding rather than decoration.

  3. 03

    Verify the round trip

    For important data, decode the new result once and confirm it matches the starting text exactly.

Worked examples

These small examples show the exact transformation, including the characters that are easy to overlook.

A short plain-text message

Input
Hello, JustUtils!
Result
SGVsbG8sIEp1c3RVdGlscyE=

Punctuation and the space are part of the input. Decoding the result reproduces the same message.

UTF-8 text with an emoji

Input
café ☕
Result
Y2Fmw6kg4piV

The accented letter and coffee symbol use multiple UTF-8 bytes, which is why the output is longer than a simple character count suggests.

Understand the format

Base64 is an encoding, not a lock.

Computers store text and files as bytes. Base64 reads those bytes in small groups and represents them with a limited alphabet of letters, numbers, plus, slash, and optional equals-sign padding. That alphabet is convenient in text-based formats that may not safely carry arbitrary bytes.

Encoding makes data about one third larger and provides no secrecy. It is appropriate for transport and representation, while encryption and hashing solve different security problems.

Useful for

  • Inspecting a Base64 field from an API response, data URI, or configuration value.
  • Representing a small piece of text where only text-safe characters are accepted.
  • Checking whether an encoded value returns to the expected UTF-8 text.

Check before you copy

  • Do not paste passwords, private keys, access tokens, or confidential customer data into examples you plan to share.
  • A JWT uses a related Base64URL alphabet, which replaces some characters and often removes padding. Use the JWT debugger for a full token.
  • This text tool is not a file encoder. Converting a binary file requires reading its raw bytes, not pasting a filename.

Common questions

Answers for first-time users

Does Base64 encrypt or protect my text?

No. Base64 only changes binary data into a text-friendly representation. Anyone who has the encoded value can decode it, so never treat Base64 as encryption or use it to hide a password or secret.

Why does a Base64 value sometimes end with = or ==?

Base64 works with groups of three input bytes and four output characters. If the final group is short, one or two equals signs are added as padding so a decoder knows how many bytes belong in the last group.

Can this tool encode emoji and accented letters?

Yes. The tool converts text to UTF-8 before encoding, so characters such as é, สวัสดี, and emoji can make a correct round trip back to the original text.

Is the text I paste uploaded?

No. Encoding and decoding happen in your browser. JustUtils does not send the text to a server for this conversion.