Base64 Encoder/Decoder

Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format. It's commonly used to encode binary data for transmission over text-based protocols like email or JSON, ensuring data integrity across different systems.

Use Base64 encoding when you need to: embed images in HTML/CSS, send binary data through JSON APIs, store complex data in URLs, encode email attachments, or transmit binary data through systems that only support text.

No, Base64 is NOT a security feature. It's an encoding scheme, not encryption. Base64 encoded data can be easily decoded by anyone. Never use Base64 to hide sensitive information - use proper encryption methods instead.

Base64 encoding increases data size by approximately 33% because it converts every 3 bytes of binary data into 4 ASCII characters. This overhead is the trade-off for making binary data safely transmittable as text.

Yes! This tool supports encoding any file type including images (PNG, JPG, GIF), documents (PDF, DOC), and other binary files. Simply upload the file or drag and drop it into the encoder. The tool also provides a preview for images.

While there's no hard limit, very large files (over 50MB) may cause browser performance issues since all processing happens client-side. For optimal performance, we recommend keeping files under 10MB.

A Base64 data URI is a way to embed file data directly in HTML or CSS. It starts with 'data:' followed by the MIME type and the Base64 encoded content. For example: data:image/png;base64,iVBORw0KGgo...

You can decode any valid Base64 string, but you need to know the original format to properly interpret the decoded data. This tool attempts to detect common formats like images and text automatically.

Base64 uses 64 characters: A-Z (26), a-z (26), 0-9 (10), plus sign (+), and forward slash (/). The equals sign (=) is used for padding at the end when necessary.

Most programming languages have built-in Base64 support. In JavaScript: btoa() for encoding and atob() for decoding. In Python: base64.b64encode() and base64.b64decode(). In PHP: base64_encode() and base64_decode().

URL-safe Base64 replaces '+' with '-' and '/' with '_' to avoid issues with URL parsing. It also typically omits padding (=) characters. This tool provides an option to generate URL-safe Base64.

Yes, this Base64 encoder/decoder is completely free with no limits. All processing happens in your browser for privacy and security. No registration required and no data is sent to our servers.