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Base64 Encode / Decode

Encode and decode Base64 strings for data transmission

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About This Tool

Base64 Encode / Decode is a browser-based tool that instantly converts text to Base64 encoding and decodes Base64 strings back to readable text. It supports Unicode characters including Chinese, offers a URL-safe encoding mode, and lets you drag-and-drop files for direct encoding. All processing happens locally in your browser — no data is ever sent to a server.

Key Features

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Use Cases

base64 encoding decode url-safe

Frequently Asked Questions

What is Base64 encoding and why is it used?

Base64 is a binary-to-text encoding scheme that converts binary data into ASCII characters. It is commonly used to encode data for transmission over media designed to handle text, such as email attachments, data URIs in HTML/CSS, and API authentication headers.

What is URL-safe Base64 and when should I use it?

URL-safe Base64 replaces the characters + and / with - and _ respectively, and removes the = padding. You should use it when embedding Base64 data in URLs, query parameters, or filenames where +, /, and = would cause parsing issues.

Does this tool support Chinese and other non-ASCII characters?

Yes. The tool uses UTF-8 encoding internally, so Chinese, Japanese, Korean, emoji, and any other Unicode characters are fully supported. The encoding process first converts the text to UTF-8 bytes, then applies Base64 encoding.

Is Base64 encryption? Is it secure for storing passwords?

No, Base64 is an encoding method, not encryption. It does not provide any security — anyone can decode Base64 strings. Never use Base64 to store or transmit sensitive data like passwords. Use proper encryption algorithms for security purposes.

Can I encode files with this tool?

Yes. You can drag and drop any file onto the tool, or click the file drop area to select a file. The tool will read the file and generate its Base64 data URI, which you can then copy and use in your HTML, CSS, or other applications.