Local history without an account
How localStorage makes repeated Base64 work faster while keeping the record under the user’s control.
A browser notebook
Conversion history is useful when you are comparing API samples or checking several payloads in a row. Instead of creating an account, Decode Base64 stores a small history list in localStorage. It behaves like a notebook inside the current browser profile.
Search before you paste again
The search box filters by input, output, and mode. That makes it easy to find a recent token segment, a repeated fixture, or the exact decoded text you checked a few minutes earlier.
Export when the work is done
The export button writes a JSON file with the full local history. You can attach that file to your own notes or delete the browser history afterward. The site does not receive a copy.