Privacy Secured: This utility runs 100% inside your browser. No files, logs, or values are uploaded to any server. Your information stays safe on your device.
About Base64 Decoder
The Base64 Decoder is a secure client-side utility designed to translate Base64 strings back into their original text format or download them as binary files. When receiving Base64 encoded data from APIs, emails, or code snippets, you need a quick way to decode it. Our decoder processes everything locally in your browser, keeping your data confidential.
How it Works
Select either Text or File mode. Paste your Base64 string into the input box. In Text mode, click Decode to display the decoded text. In File mode, enter your target file name (e.g. image.png) and click Download to save the decoded file to your device.
Key Features
- Dual Modes: Decode back to readable text or binary files.
- File Downloader: Reconstructs and downloads binary files.
- Secure & Local: All decoding happens on your device.
- Error Checks: Validates Base64 syntax before decoding.
Technical Details
Text decoding uses the browser's atob() function, decoding UTF-8 characters via decodeURIComponent(escape(atob(str))). File decoding strips standard Data URL headers, decodes the base64 string into a binary array, wraps it in a Blob object, and triggers a download link.