Everything you need to know about Base64 encoding and decoding
Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format. It uses 64 different characters (A-Z, a-z, 0-9, +, /) to encode data, making it safe for transmission over text-based protocols like email or HTTP.
Base64 encoding is commonly used to embed binary data (like images or files) in text formats such as HTML, CSS, JSON, or XML. It's also used to safely transmit binary data over protocols designed for text, encode credentials in HTTP headers, and store binary data in databases that only support text.
No, Base64 is NOT encryption or a security measure. It's simply an encoding method that makes binary data text-safe. Anyone can easily decode Base64 strings. Never use Base64 alone to protect sensitive information - use proper encryption methods instead.
You can encode any file type including images (PNG, JPG, GIF), documents (PDF, DOCX), text files, audio, video, and more. The tool supports files up to 10MB in size. All processing happens in your browser, so your files never leave your device.
Yes, Base64 encoding increases the data size by approximately 33%. This is because it uses 4 characters to represent every 3 bytes of original data. For example, a 100KB file will become approximately 133KB when Base64 encoded.
You can decode any valid Base64 string. The tool will validate the input and show an error if the Base64 string is malformed. If the decoded data is text, it will be displayed as readable text. If it's binary data (like an image), you can download it as a file.
Yes, absolutely. All encoding and decoding operations happen entirely in your browser using client-side JavaScript. No data is sent to any server or stored anywhere. Your files and text never leave your device, ensuring complete privacy and security.
The tool supports files up to 10MB in size. This limit ensures optimal performance in your browser. If you need to encode larger files, consider splitting them into smaller chunks or using a command-line tool.
Once the page is loaded, the tool works entirely in your browser without requiring an internet connection. However, you need to initially load the page while online. For completely offline use, you can save the page or use browser caching.
The tool uses UTF-8 character encoding for text operations. This ensures proper handling of international characters, emojis, and special symbols. UTF-8 is the most widely used character encoding on the web.
If you see strange characters after decoding, it usually means the Base64 string contains binary data (like an image or file) rather than text. In this case, use the download button to save the decoded data as a file instead of viewing it as text.
Currently, the tool processes one file at a time to ensure optimal performance and clarity. You can encode multiple files by processing them sequentially. Each encoding operation is instant and efficient.
The tool works on all modern browsers including Chrome, Firefox, Safari, and Edge. It requires support for modern JavaScript features like FileReader API, Clipboard API, and TextEncoder/TextDecoder. Most browsers from the last 3-4 years are fully supported.
Click the "Copy to Clipboard" button in the output panel to instantly copy the result. The tool will show a confirmation message when the copy is successful. You can then paste the result anywhere you need it.
Yes, you can download both encoded and decoded results using the download button in the output panel. For encoded text, it will be saved as a .txt file. For decoded binary data, the tool attempts to detect the original file type and use the appropriate extension.
This error appears when the input string is not properly formatted Base64. Base64 strings should only contain A-Z, a-z, 0-9, +, /, and = characters. Check for typos, missing characters, or extra whitespace in your input.
Upload your image file using the file upload feature in encode mode. The tool will generate a Base64 string. For HTML, use it in an img tag like: <img src="data:image/png;base64,YOUR_BASE64_STRING">. For CSS, use it in background-image: url(data:image/png;base64,YOUR_BASE64_STRING).
No, Base64 encoding only preserves the raw binary content of the file. Metadata like creation date, author, EXIF data, or file permissions are not included in the encoding. Only the actual file content is encoded.
If you couldn't find the answer you were looking for, feel free to try the tool and explore its features. All operations are instant and safe, happening entirely in your browser.
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