Base64 Encoder

Convert text into Base64, a safe ASCII representation used for data URIs, email attachments, and embedding small assets. Type or paste your text and the Base64 string appears instantly. Encoding is UTF-8 aware and runs entirely in your browser, so nothing you enter is uploaded.

Plain Text Input

Base64 Output

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Why use Base64 Encoder?

Base64 solves a specific problem: how to move binary or non-ASCII data through channels that only reliably handle plain text, such as JSON fields, URLs, email headers, and HTML attributes. It maps every three bytes onto four printable ASCII characters drawn from A-Z, a-z, 0-9, plus, and slash, which is why the output is about a third larger than the input. This encoder is UTF-8 aware. Plain btoa in the browser breaks on characters above the Latin-1 range, so the tool first converts your text to UTF-8 bytes, meaning accented letters, non-Latin scripts, and emoji all round-trip correctly. If your pasted text contains a broken character, usually half of an emoji left over from a truncated copy, the tool shows a clear message instead of failing silently. Keep one rule in mind: Base64 is reversible by anyone. It is a transport format, not a security measure. It is the right tool for inlining a small image as a data URI or building an Authorization header, and the wrong tool for protecting anything sensitive.

Key benefits

UTF-8 safe, accented characters and emoji encode correctly
Instant, live encoding as you type
Runs client-side, your input never leaves the browser
Useful for data URIs, MIME email parts, and config values

Features

Handles full Unicode text via UTF-8 before encoding
Live output with one-click copy
No length limit beyond browser memory

Popular use cases

Creating a data: URI to inline a small SVG or font
Encoding a value to embed in JSON, YAML, or an env variable
Preparing a string for an HTTP Basic Authorization header
Generating MIME-encoded content for an email payload

How to use Base64 Encoder

1
Enter your text
Type or paste the text you want to encode into the input box.
2
Read the Base64
The encoded Base64 string appears instantly in the output panel.
3
Copy the result
Click "Copy Base64" to copy the encoded string to your clipboard.
4
Clear and start over
Click "Clear" to empty the input box and encode something new.

Frequently asked questions

Is Base64 encryption?

No, and this is the most important thing to know. Base64 is encoding, not encryption. Anyone can decode it instantly. Never use it to hide passwords or secrets, it provides zero confidentiality.

Why is the Base64 longer than my text?

Base64 represents every 3 bytes as 4 ASCII characters, so the output is roughly 33% larger than the input. That size cost is the trade-off for being safe to transport as plain text.

Does it handle emoji and accented letters?

Yes. The tool encodes your text as UTF-8 first, so characters outside basic ASCII (accented letters, non-Latin scripts, emoji) are preserved correctly.

Is my text uploaded?

No. Encoding happens in your browser with the built-in encoder; nothing is sent to a server.

Can I encode a whole file instead of typed text?

No, this tool takes typed or pasted text only, there is no file upload. It is meant for encoding strings, such as a short value or a snippet, not binary files.

Related guides

Base64 Explained: What It Is, What It Isn't (Not Encryption)

Last reviewed: July 2026

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