About Base64 Tools
A free, privacy-respecting online tool for Base64 encoding and decoding.
What is this tool?
Base64 Tools is a free, browser-based utility for encoding and decoding data in Base64 format. All processing happens entirely in your browser — no data is ever uploaded to any server.
Features
- Text Encoding/Decoding: Encode any text string to Base64 with support for 8 different character sets (UTF-8, GBK, Big5, Shift-JIS, ISO-8859-1, CP850, and more).
- File Encoding/Decoding: Upload any binary file and get its Base64 representation, or decode Base64 back to a downloadable file with automatic MIME type detection.
- Image Encoding/Decoding: Convert images to Base64 data URLs suitable for embedding in HTML, CSS, or JavaScript. Also supports clipboard paste (Ctrl+V).
- Multi-Language UI: The interface is available in English, Chinese (中文), Japanese (日本語), Spanish (Español), French (Français), and German (Deutsch).
- Privacy First: All encoding and decoding is done locally in your browser. Your files and text never leave your device.
Large File Support
Files are processed in 30KB chunks to maintain browser responsiveness. For files larger than 50MB, a warning is shown as processing may slow down the browser's main thread.
Privacy
We take your privacy seriously. Please read our Privacy Policy for details about what data we collect and how we use it.
Advertising
This site uses Google AdSense to display advertisements, which helps cover server and maintenance costs. Ads are only loaded after you explicitly consent to cookies. You may decline cookies and the site will function fully without ads.
Contact
Found a bug or have a feature request? Please open an issue on our repository or reach out via the feedback form. We're committed to improving this tool based on user feedback.
Disclaimer
This tool is provided "as is" without warranty of any kind. While we strive for accuracy, we recommend verifying critical encodings independently. The tool is not suitable for cryptographic or security-sensitive use cases.