Validators
Base64 Validator
Validate Base64 strings and check encoding format directly in your browser.
Tool
Validate Base64 strings and check encoding format directly in your browser.
This tool runs in your browser. Your input is processed locally and is not uploaded.
About this Tool
Use this free Base64 Validator to check whether a string is valid Base64 encoded data. It can help detect invalid characters, incorrect padding, broken length, URL-safe Base64 variants, and decoded output issues. The validation runs directly in your browser, so your encoded data does not need to be uploaded.
Examples
- SGVsbG8gd29ybGQ=
- eyJuYW1lIjoiQW5uYSJ9
Frequently Asked Questions
What does this Base64 validator check?
It checks whether the input follows Base64 syntax, including allowed characters, padding, length, and decodability.
Can it decode Base64 too?
The main purpose is validation, but the tool may also show decoded output to help you inspect the data.
Is my Base64 text uploaded?
No. The validation is designed to run locally in your browser.