How to Use
- 1 Paste your plain text or Base64 string into the Input panel.
- 2 Click Encode to convert text to Base64, or Decode to convert Base64 back to text.
- 3 Review the result in the Output panel.
- 4 Click Copy to copy the output to your clipboard.
- 5 Use Sample Input to load an example and explore the tool.
- 6 Click Clear to reset both panels and start fresh.
Frequently Asked Questions
Is my data sent to your server?
No. All encoding and decoding happens entirely in your browser using JavaScript. Your data never leaves your device and is never stored or logged anywhere.
Does this tool support UTF-8 and Unicode characters?
Yes. The encoder uses TextEncoder/TextDecoder APIs to handle UTF-8 text correctly, including emoji, accented characters, and non-Latin scripts.
What is Base64 encoding used for?
Base64 is commonly used to encode binary data for transmission over text-based protocols. Common uses include embedding images in CSS/HTML, encoding API credentials in HTTP headers, storing binary data in JSON, and email attachments (MIME).
What happens if I try to decode invalid Base64?
The tool will show a clear error message indicating the input is not valid Base64. Common issues include incorrect padding (missing = characters) or invalid characters.
What is the difference between standard Base64 and URL-safe Base64?
Standard Base64 uses + and / characters which can cause issues in URLs. URL-safe Base64 replaces + with - and / with _. This tool uses standard Base64 encoding.
Can I encode binary files with this tool?
This tool is designed for text input. For binary file encoding (images, PDFs, etc.), you would need a file-based Base64 encoder that reads binary data directly.
Why does my Base64 output end with = or ==?
Base64 encodes 3 bytes at a time into 4 characters. If the input length is not a multiple of 3, padding characters (=) are added to make the output length a multiple of 4.
Is Base64 a form of encryption?
No. Base64 is an encoding scheme, not encryption. It is easily reversible and provides no security. Do not use Base64 to protect sensitive data — use proper encryption instead.