Encode any text or local file to Base64 format instantly in your browser. Perfect for API authentication, data URIs, and secure data transmission. No data uploads required.
Encoding text or files to Base64 is straightforward. Follow these steps:
Type or paste the text you want to encode, or drag & drop a local file directly into the input area.
The tool automatically converts your input to Base64 format. Results appear instantly.
Use the copy icon to copy the encoded text, or download it directly as a .txt file.
Text is encoded to Base64 in real-time as you type — no waiting.
All processing happens in your browser. Your data never leaves your device.
Perfect for encoding API credentials, JWT payloads, and data URIs.
Works perfectly on smartphones and tablets — Android and iOS.
Encode unlimited text — no usage caps, no registration required.
No hidden costs, no premium plans. Free for everyone, forever.
Base64 encoding is a method of converting binary data or plain text into a string of ASCII characters that can be safely transmitted over text-based protocols. It is formally defined in RFC 4648 by the Internet Engineering Task Force (IETF). Base64 uses a set of 64 characters — uppercase letters (A-Z), lowercase letters (a-z), digits (0-9), plus (+), and forward slash (/) — along with the equals sign (=) for padding.
The encoding process works by taking every 3 bytes (24 bits) of input data and splitting them into 4 groups of 6 bits each. Each 6-bit group is then mapped to one of the 64 characters in the Base64 alphabet. This results in encoded output that is approximately 33% larger than the original input — a small trade-off for the ability to safely transmit binary data through text-only channels.
Base64 encoding is used extensively across the web and in software development. Here are the most common scenarios:
Our Base64 Encoder uses JavaScript's built-in btoa() function — a standard Web API available in all modern browsers. The btoa() function creates a Base64-encoded ASCII string from a binary string. This function is part of the HTML Living Standard maintained by WHATWG. Because encoding happens entirely in your browser, your data never leaves your device — ensuring complete privacy.
Base64 encoding converts text or binary data into ASCII for safe transmission over text-based protocols. Common uses include HTTP Basic Auth headers, JWT tokens, data URIs, and email MIME attachments.
Simply type or paste your text into the input box above. The tool encodes it instantly using JavaScript's btoa() function. Copy or download the result.
Base64 encoding increases data size by approximately 33%. Every 3 bytes of input become 4 Base64 characters, plus possible = padding.
Yes! 100% free, unlimited use. All encoding happens in your browser — your data never leaves your device.
Encoding converts text TO Base64 format. Decoding converts Base64 BACK to original text. We offer both — check our Base64 Decoder.