Base64 Decode
Decode Base64 encoded strings back to their original text or data format. This tool helps you decode Base64 encoded data from APIs, data URLs, or other sources. Fast, client-side decoding with no server required.
When to use this tool
You need to inspect a Base64 string from an API or data URL.
You want to verify what text or payload a Base64 token contains.
Examples
Decode a simple payload
Input
aGVsbG8gd29ybGQ=
Output
hello world
Remove any data URL prefixes before decoding.
Developer use cases
Decode JWT segments or basic auth headers for debugging.
Inspect embedded data URLs for quick QA checks.
Common mistakes to avoid
Including the data URL prefix (data:image/png;base64,) in raw Base64 input.
Decoding padded strings with missing or invalid characters.
Format and behavior notes
Invalid Base64 input will return an error.
Use UTF-8 text to avoid unexpected character output.
Related Tools
Frequently Asked Questions
How do I decode Base64?
Simply paste your Base64 encoded string into the input field. The decoded result will appear automatically.
What if the Base64 string is invalid?
The tool will show an error message if the Base64 string is malformed or invalid.
Can I decode Base64 images?
Yes, if you have a Base64 encoded image string, you can decode it. The tool will show the decoded data.