What is Base64 Decoder?
The decoder converts Base64 characters back to bytes and reads them as UTF-8 text. URL-safe Base64 (using - and _ instead of + and /) is accepted, which is the variant used inside JWTs.
How to use Base64 Decoder
- Paste your input into the editor above, or select Sample to load an example.
- Select Decode Base64. If the input cannot be processed, a message explains what to fix.
- Use Copy or Download to take the result with you, and Clear to start again.
Example
Input
SGVsbG8sIERldktpdGx5IQ==Output
Hello, DevKitly!Practical use cases
- Inspect encoded payloads
- Decode email or API values
- Verify Base64 transformations
Common problems
- Assuming decoded content is safe
- Confusing Base64URL with standard Base64
- Removing required characters from malformed input
Frequently asked questions
Is Base64 Decoder free to use?
Yes. Base64 Decoder is free and does not require an account.
Does my input leave the browser?
No. This tool performs its processing locally in your browser and does not need to upload your input.