This free online Base64 to Excel Decoder allows you to convert Base64-encoded Excel strings back into downloadable Excel files (.xls and .xlsx formats). Base64 encoding is commonly used to embed binary files like Excel spreadsheets in text-based formats such as JSON, XML, HTML, or API responses. Simply paste your Base64 string, specify a filename, and click "Download Excel" to instantly retrieve your spreadsheet. This online decoder tool is essential for developers, data analysts, and system integrators who work with APIs, database exports, or legacy systems that encode Excel files as Base64 strings for transmission or storage.

How It Works: The tool automatically detects whether your Base64 string contains an .xls (older Excel format) or .xlsx (modern Excel format) file by analyzing the file signature magic bytes. It supports Data URI format (data:application/vnd.ms-excel;base64,...) and raw Base64 strings. The decoding process happens entirely in your browser using JavaScript, ensuring maximum security and privacy - your data never leaves your device. Features include fast and secure Base64 decoding to Excel, automatic format detection, validation of Base64 strings to prevent errors, one-click download functionality, and no file size limitations. Perfect for recovering Excel files from API responses, extracting spreadsheets from JSON data, or converting database-stored Base64 blobs back to usable Excel files.

Common Use Cases: Developers use this tool when working with REST APIs that return Excel files as Base64 encoded strings, testing API endpoints during development, extracting Excel files from NoSQL databases that store binaries as Base64 text, processing data exports from legacy systems, and debugging data integration issues. Data analysts find it useful for quickly accessing spreadsheet data embedded in web service responses or configuration files. The tool is also handy for retrieving Excel files from email systems that encode attachments, converting data from XML-based integrations, or working with content management systems that store files as text. Security and Privacy: All decoding happens client-side in your browser - no server uploads, no data storage, complete privacy. If you need to encode Excel files to Base64, try our companion Excel to Base64 Encoder tool. No registration required, completely free, works on all devices.