Base64 Decode
Decode text to and from Base64 format. Free, fast, and secure Base64 decoder. 100% client-side processing, no server upload.
Input (Base64 Decode)
What is Base64 Decode?
Base64 is a binary-to-text encoding scheme that represents binary data in an ASCII string format using a radix-64 representation. It's widely used for transmitting data over channels that only support ASCII text, like email or embedding images in HTML/CSS.
How to Use Base64 Decode
1. Paste your Base64-encoded text into the input field. 2. The decoded result appears instantly in the output field. 3. Click "Copy" to copy the decoded text to your clipboard. 4. Use "Clear" to reset and start over.
When to Use Base64 Decode
Use Base64 decoding to extract original data from Base64-encoded strings, read data URLs, or decode email attachments and API responses.
How Base64 Decode Works
Base64 encoding divides binary data into 6-bit chunks (2^6=64 possible values), maps each chunk to a printable ASCII character (A-Z, a-z, 0-9, +, /), and uses "=" for padding when the input length isn't a multiple of 3 bytes. This increases data size by approximately 33%.
Common Use Cases
- Data URLs in HTML/CSS
- Email attachments (MIME)
- JSON/XML data embedding
- Authentication tokens
- API data transmission
- Storing binary data in databases
Security Note
⚠️ Base64 is NOT encryption! It's easily reversible and provides no security. Never use it to protect sensitive information.
FAQs
1 What is Base64 used for?
Base64 is primarily used for data urls in html/css, email attachments (mime), and many other applications where base64 encoding is needed.
2 Is Base64 secure?
Base64 is an encoding method, not encryption. It provides no security and can be easily reversed. Never use it to protect sensitive data.
3 Is this tool safe to use?
Yes! All decodeing happens in your browser. Your data never leaves your device and is not sent to any server.