: While it is a third-party site, community discussions and advisors often list it alongside other reputable tools like for situations where Microsoft itself cannot assist. Limitations and Considerations
Excel files created in versions 2007 through 2024 use AES encryption with a 128- or 256-bit key—a federal encryption standard adopted by the National Institute of Standards and Technology. Without the correct password, the file contents appear as a completely random stream of bytes with no backdoors or workarounds. As Microsoft officially states, “a password-protected document cannot be recovered if the password for that document is lost or forgotten”.
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When you upload an encrypted Excel file, LostMyPass automatically initiates its free recovery process. lostmypass ms excel password recovery verified
Verified reports indicate that the tool can crack "Sheet Protection" almost instantly and maintains a documented success rate of approximately 22% for its free "Weak Password" recovery search against a database of 3 million common passwords.
Excellent for older .xls files, often stripping away the workbook or worksheet protection instantly.
If you need help exploring other options, please let me know: : While it is a third-party site, community
Perhaps most tellingly, users on the official Microsoft Community Hub have recommended LostMyPass to others. In one thread, a user whose treasury office had forgotten a password to an important Excel sheet reported: “I thankfully was able to find a free website that was able to take an upload of the document and immediately remove the password. The site was https://www.lostmypass.com“.
Despite high-end hardware, truly random, long passwords (e.g., p@$$w0rd!123456789 ) remain mathematically impossible to brute-force in a reasonable timeframe. Data Security and Privacy: Is It Safe?
If unsuccessful: You will be prompted with an option to proceed to the paid Strong Password Recovery queue. Is LostMyPass Verified and Safe? If you share with third parties, their policies apply
If successful: The password is typed out on your screen instantly.
: Operates completely within your web browser.
Beyond standard .xlsx and .xls formats, it supports password recovery for .xlsm and .xlsb files. Security and Risk Considerations