When to use this tool
Recover text from a standard Base64 value that was escaped inside a URL parameter. Undo percent encoding before decoding Base64.
Example
Use “Try example” to load this public sample and its settings, then run it.
Input
SGVsbG8sIHdvcmxkIQ%3D%3D
Result
Hello, world!
How the result is produced
Conventions and limitations
This example uses the standard alphabet. Base64url tokens use a different alphabet; use the dedicated Base64 tool with the URL-safe alphabet for those tokens.
How to use this page
- Paste your input or open a local file.
- Adjust tool options if needed, then choose Run tool.
- Copy the result or download the original output bytes.
Inputs and results are not added to the public catalogue or saved in the URL. Processing happens in your browser; HTTP Request and DNS over HTTPS send the requests you explicitly run. Files up to 128 MiB can be opened; decompression and image tools may have smaller processing limits. Large results have a shortened preview. Text and HTML downloads use UTF-8; binary downloads preserve output bytes. Pasted text follows browser newline handling; open a file when exact input bytes matter.