Base64 Encoder

Encode text to Base64 online, with full Unicode and URL-safe support — free and instant.

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About

About the Base64 Encoder

Encodes any text you paste — including full Unicode — into standard Base64, with an optional URL-safe alphabet.

Developers use it to build test data URIs or embed small binary-like payloads in JSON or config files, while anyone debugging an API uses it to see exactly what a Base64-encoded credential or token looks like before it's sent. It's one of many free data tools on Toolapt, and like every tool here, it's free to use with no sign-up and no limit on how many times you run it.

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Guide

Using the Base64 Encoder

  1. 1

    Step 1

    Type or paste the text you want to encode.

  2. 2

    Step 2

    Turn on "URL-safe alphabet" if the result needs to be used in a URL or filename.

  3. 3

    Step 3

    Click "Encode" to produce the Base64 string.

  4. 4

    Step 4

    Click "Copy" to copy the result, or "Clear" to start over.

  • Encodes full Unicode text correctly, not just plain ASCII
  • Optional URL-safe alphabet ( - and _ instead of + and / , with no padding)
  • Shows exactly how many characters were encoded
  • One click to copy the encoded result
  • Works entirely in your browser — nothing you type is sent to a server
  • Free to use, with no sign-up and no limit on how many times you run it
  • Fully responsive, so it works just as well on a phone as on a desktop

Developers

Developers use the Base64 Encoder for building data URIs, test fixtures, or embedding small payloads inside JSON or config files.

API integrators

API integrators use the Base64 Encoder for seeing exactly what a Basic Auth header or API credential looks like once encoded.

QA engineers

QA engineers use the Base64 Encoder for preparing encoded test values when checking that a system decodes and handles them correctly.

Students learning encoding

Students learning encoding use the Base64 Encoder for seeing how the same text turns into different Base64 output depending on the alphabet used.

Examples

Base64 Encoder examples

3 worked examples

01

Encode a greeting

Encoding "Hello" produces SGVsbG8=, with those 5 bytes becoming 8 Base64 characters.

02

Encode a sentence

Encoding "Hello, World!" produces SGVsbG8sIFdvcmxkIQ==, using the standard alphabet.

03

URL-safe alphabet on

Encoding "Hello, World!" with URL-safe alphabet on produces SGVsbG8sIFdvcmxkIQ, with no padding, ready for a URL or filename.

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FAQ

Frequently asked questions

Quick answers to common questions about the Base64 Encoder.

What does the Base64 Encoder do?

It converts text into Base64, a way of representing binary-safe data using only printable ASCII characters.

Is the Base64 Encoder free to use?

Yes. It's free, with no sign-up, no watermark and no limit on how many times you use it.

Is my text safe when I use this tool?

Yes. Encoding happens entirely on your own device using your browser's built-in Base64 support — nothing you type is sent to a server.

What does "URL-safe alphabet" do?

It replaces the standard Base64 characters + and / with - and _ , and removes trailing = padding, so the result can be used safely inside a URL path, query string or filename.

Does this handle Unicode text, like emoji or accented characters?

Yes. The text is converted to UTF-8 bytes before encoding, so full Unicode text round-trips correctly.

Is Base64 encoding the same as encryption?

No. Base64 is just a reversible encoding, not encryption — anyone can decode it back to the original text instantly. Don't use it to protect secrets.

Can I use the Base64 Encoder on my phone?

Yes. The page is fully responsive and works on mobile, tablet and desktop browsers alike.

Does the Base64 Encoder have any limitations?

It's built for typical text payloads pasted into the box. Extremely large inputs may be slower, but there's no artificial length restriction.

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