Convert text to Base64 and decode Base64 back to text, entirely in your browser.
Understanding the base64 encode & decode calculation
Base64 encodes text (and binary) into a safe set of characters for transport in URLs, emails and data files. Paste text to encode it, or paste Base64 to decode it back.
Everything runs locally — nothing is sent anywhere.
Worked example
As an example, with a text of Hello world, the calculator returns a base64 of SGVsbG8gd29ybGQ=. Change any field and every figure updates as you type.
Using the calculator
- Choose encode or decode.
- Paste your text or Base64.
- Copy the result.
The calculation
encoding groups bytes into 6-bit chunks mapped to 64 characters
Common questions
What is Base64?
A way to represent data using 64 safe characters, so it survives systems that only handle text.
Is Base64 encryption?
No — it’s encoding, not encryption. Anyone can decode it, so never use it to hide secrets.
Does my text leave my device?
No — encoding and decoding happen entirely in your browser.