Base64 Encode
This free online Base64 encoder converts any text into safe-to-transmit Base64 the moment you type it.
How to use
- Type or paste the text you want to encode into the editor below.
- The Base64 result appears instantly, computed as UTF-8 bytes so Chinese and emoji encode correctly.
- Copy the result; it was produced on your device and never left your browser.
Frequently asked questions
Is Base64 a form of encryption?
No. Base64 is an encoding, not encryption: it changes how bytes are represented so they survive text-only channels, but anyone can decode it instantly with no key. Never treat Base64 output as protected — it only prevents transport corruption, not reading.
Why does my output contain +, / and = characters?
Those are part of the standard Base64 alphabet: + and / are the 63rd and 64th symbols, and = is padding added so the output length is a multiple of four. This tool follows the standard alphabet, which is what servers and libraries expect by default.
Does it handle Chinese characters and emoji?
Yes. Text is converted to UTF-8 bytes before encoding, which is the universal convention. "Hello 世界" produces SGVsbG8g5LiW55WM — identical output to your backend and command-line tools, with no garbled bytes.
Is my text uploaded to a server?
No. Encoding happens locally in your browser the moment you type. Your text never leaves your device, is never stored or logged, and disappears when you close the page.
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About this tool
This free online Base64 encoder converts any text into safe-to-transmit Base64 the moment you type it. Base64 exists because many channels only move plain ASCII reliably: email headers, HTTP basic auth credentials, JSON fields carrying binary identifiers, data URLs embedded in HTML or CSS, and configuration values that must survive systems that mangle raw bytes. A naive encoder breaks the moment your text leaves ASCII — one Chinese character or one emoji produces invalid output — so this encoder converts your text to UTF-8 bytes first and encodes those bytes, which is exactly the convention every serious system assumes. Paste "Hello 世界" and you get the same Base64 your backend, your JWT library and your favorite command line tool would produce. The result updates live as you type, with no length caps and no signup. Everything runs entirely in your browser: passwords, tokens and private text are encoded locally on your own device and never uploaded, stored or logged. Type or paste below and copy the Base64 you need.