This free Base64 encoder and decoder allows you to quickly convert text to Base64 format and decode Base64 strings back to readable text. The tool runs entirely in your browser and works even offline as a Progressive Web App (PWA).
Unlike many online Base64 tools, this application stores history locally in your browser and optionally allows encrypted storage using AES-GCM encryption. No data is sent to any server which makes this tool safe for developers who need to inspect tokens, headers or encoded payloads.
Base64 is a binary-to-text encoding format that converts binary data into ASCII text. It is widely used in web development, APIs, authentication tokens, email attachments and data URLs.
No. Base64 is not encryption. It only converts binary data into text. Anyone can decode a Base64 string easily.
No. All encoding and decoding happens locally in your browser. Nothing is uploaded to any server.
Yes. This Base64 tool is a Progressive Web App and works even without an internet connection once installed.
Developers use Base64 encoding for transmitting binary data in text formats such as JSON APIs, email attachments, JWT tokens and data URLs.
| Action | Input | Result |
|---|---|---|
| Encode text to Base64 | Hello World |
SGVsbG8gV29ybGQ= |
| Decode Base64 string | U29tZSBkYXRh |
Some data |
| Base64 in APIs and JWT | Base64 encoding is commonly used in APIs and authentication tokens such as JSON Web Tokens (JWT). The header and payload are encoded using Base64-URL format. | |