Base64 Decoder Online
Decode base64 encoded strings back to plaintext instantly in your browser. Our tool executes 100% locally on your machine, ensuring complete privacy.
How Base64 Decoding Works
Base64 decoding reverses the base64 encoding algorithm. It takes batches of four 6-bit characters and reconstructs the original three 8-bit bytes of plaintext.
Security & Privacy
Our online base64 decoder is fully client-side. The input data is processed directly inside your browser and is never sent to our servers.
Frequently Asked Questions
- Yes, because it runs client-side in your browser, your data is never transmitted over the internet.
- It uses UTF-8 encoding via the browser's native TextDecoder API.