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Hazuu Tools

Base64 Encode

Encode text to Base64 format — paste, encode, and copy instantly.

Input Text
Output Base64
Encoded Base64 will appear here...
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About Base64 Encode

Base64 Encode is a free online tool that converts plain text, numbers, or any UTF-8 string into Base64-encoded format. Base64 is a binary-to-text encoding scheme that represents data using 64 printable ASCII characters (A–Z, a–z, 0–9, +, /). Because the resulting string contains no special characters, it travels safely through systems that would otherwise corrupt raw binary — MIME email, HTTP headers, JSON payloads, and URL query strings all accept it without escaping.

You would reach for this tool when a system you are integrating with demands a Base64 string rather than raw text. Typical triggers include constructing a Basic Auth header (username:password encoded to Base64), writing a data URI to embed a small string directly in HTML or CSS, passing credentials in a CI/CD environment variable, or preparing binary content for a REST API that only accepts JSON. The encoder uses the native TextEncoder and btoa() APIs internally, so multi-byte characters — including accented letters, CJK text, and emojis — are first converted to their correct UTF-8 byte representation before encoding, which avoids the silent corruption that simpler implementations produce.

All encoding runs entirely inside your browser. Nothing is uploaded, logged, or transmitted to any server. You can safely encode API keys, tokens, passwords, or any proprietary string without worrying about data leaving your machine. The tool is free, requires no account, and has no input size limit beyond what your browser can handle.

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Key Features

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Correct UTF-8 handling

Text is first converted to UTF-8 bytes via TextEncoder before btoa() is called. Accented characters, CJK text, and emojis encode without producing garbled output.

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100% client-side

Encoding runs in the browser using built-in JavaScript APIs. No data ever leaves your machine, making it safe for API keys, tokens, and passwords.

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Instant feedback

Paste your text, click Encode, and the Base64 string appears immediately. No page reload, no network round-trip.

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One-click copy

A copy button transfers the full encoded string to your clipboard so you can paste it directly into a header, config file, or terminal.

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Handles any plain-text input

Works on short tokens, multi-line JSON, connection strings, passwords, and anything else you can type or paste — not limited to ASCII.

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No sign-up or rate limits

Encode as many strings as you need without creating an account, waiting for a quota to reset, or paying for a plan.

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How to Use

01

Enter Text

Type or paste the text you want to encode into the input pane.

02

Encode

Click "Encode" to convert your text to Base64 format.

03

Copy Result

Use the copy button to grab your Base64-encoded output.

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Example

A plain-text API credential is encoded to Base64. The resulting string is safe to include in an Authorization header or a JSON config.

Plain text input
username:s3cr3t-p@ssword
Base64 output
dXNlcm5hbWU6czNjcjN0LXBAc3N3b3Jk
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Common Use Cases

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    Building HTTP Basic Auth headers

    The HTTP Basic Authentication scheme requires credentials in the form username:password encoded as Base64 and prefixed with "Basic ". This tool produces that encoded string in one step, ready to paste into an Authorization header.

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    Creating data URIs for inline content

    A data URI embeds small resources directly in HTML or CSS using the format data:type;base64,<encoded>. Encode short SVG icons, plain text, or JSON blobs here and use the output directly in your markup without an extra HTTP request.

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    Encoding secrets for CI/CD environment variables

    Many CI platforms store only plain-text environment variables. Base64-encoding a certificate, key file, or multi-line config value lets you store it as a single variable and decode it at build time.

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    Passing binary-safe strings through JSON APIs

    JSON does not natively carry binary data. When an API expects a Base64 field — a PDF attachment, a cryptographic signature, or a serialized object — encode the value here before placing it in the JSON body.

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    Testing Base64 decoders and parsers

    When writing or debugging a decoder, you need a known-good encoded value to test against. Encode a string whose bytes you can predict and verify that your decoder returns the original input exactly.

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Frequently Asked Questions

What is Base64 Encode? expand_more
Base64 Encode is a free online tool that converts plain text into Base64 format. Base64 is a binary-to-text encoding scheme that uses 64 printable ASCII characters to represent binary data, making it safe for transmission over text-based protocols like email and HTTP.
Does it support Unicode and emojis? expand_more
Yes. This tool fully supports Unicode text including characters from all languages, emojis, and special symbols. It uses UTF-8 encoding internally via TextEncoder to handle multi-byte characters correctly before passing the bytes to btoa(), which avoids the silent corruption that a direct btoa() call on non-ASCII text would produce.
Is my data secure? expand_more
Yes. All encoding happens entirely in your browser using JavaScript. No data is sent to any server, ensuring your text remains completely private and secure. You can safely encode passwords, API keys, and other credentials.
What is Base64 used for? expand_more
Base64 encoding is used for embedding images in HTML/CSS (data URIs), encoding credentials for HTTP Basic Authentication, transmitting binary data in JSON or XML, storing multi-line values in environment variables, and passing complex data through text-only channels.
How is Base64 Encode different from URL Encode? expand_more
Base64 Encode converts any text into a string of letters, digits, +, and / characters — it changes the representation entirely. URL Encode (also called percent-encoding) keeps readable text as-is and only escapes special characters like spaces and ampersands. Use Base64 when a system expects a Base64 field; use URL Encode when you need to safely include a value in a URL query string.
How is this different from the Base64 Decode tool? expand_more
This tool goes in one direction only: plain text in, Base64 string out. The Base64 Decode tool does the reverse — it takes a Base64 string and returns the original plain text. If you already have a Base64 string and want to read it, use the decoder instead.
Why does Base64 output always end with = or ==? expand_more
Base64 encodes 3 bytes at a time into 4 characters. When the input length is not a multiple of 3, one or two padding characters (=) are added to make the output length a multiple of 4. You can ignore the padding for display, but most parsers expect it to be present when decoding.
Is there a limit on input size? expand_more
There is no fixed limit. Because everything runs locally in your browser, you can encode large strings, with performance depending only on your device memory and browser.