Base64 Encoder
This Base64 encoder converts plain text or any uploaded file into Base64 in your browser. Type or paste text, or drop in a file, and the encoded string appears immediately; UTF-8 is used by default, with optional line breaks every 76 characters and a URL-safe variant that replaces + and / with - and _. Base64 is not encryption. It is a binary-to-text encoding used in data URIs, JSON APIs, email attachments, and JWT segments. Because the conversion runs entirely client-side with JavaScript, your text and files are never sent to a server or stored anywhere. Copy the result with one click or download it as a text file.
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How to use this tool
Overview
This Base64 encoder converts plain text or any uploaded file into Base64 in your browser. Type or paste text, or drop in a file, and the encoded string appears immediately; UTF-8 is used by default, with optional line breaks every 76 characters and a URL-safe variant that replaces + and / with - and _. Base64 is not encryption. It is a binary-to-text encoding used in data URIs, JSON APIs, email attachments, and JWT segments. Because the conversion runs entirely client-side with JavaScript, your text and files are never sent to a server or stored anywhere. Copy the result with one click or download it as a text file.Formula
Base64: 64 ASCII characters for binary-to-text encodingFrequently asked questions
Is Base64 encryption? +
No. Base64 is a reversible encoding that represents binary data with 64 printable ASCII characters. Anyone can decode it, use real encryption for secrets.
Does Base64 change the size? +
Yes, the encoded output is about 33% larger than the input because every three bytes become four characters. Line breaks add a little more.
Are my files uploaded? +
No. Encoding happens locally in your browser with JavaScript, so the text or file you encode never leaves your device.
What is Base64 encoding? +
Base64 is a method of converting binary data into a text string using 64 ASCII characters. It is commonly used for embedding images in HTML, sending attachments via email, and storing binary data in text formats.
Can I encode and decode files, not just text? +
Yes. Upload any file, images, documents, or binary data, and the tool encodes it to Base64. You can also paste Base64 to decode it back to the original file.
Is there a character or file size limit? +
There is no artificial limit. Large files produce longer Base64 strings, but the tool handles them in the browser without issues.
What is the difference between Base64 encoding and encryption? +
Base64 encoding is NOT encryption. It is a reversible representation format. Anyone can decode Base64. It provides no security.