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Protect Microsoft Excel and OpenOffice Calc formats

Protect XLS document – Unlimitted files

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Protect PDF and Word documents

Our document protect tool allows to protect several files at once online and for free. Protect PDF, DOCX or any other supported file formats. No third-party software installation is required. Web-based application is fast, robust, easy-to-use and absolutely free.

Protect multi-format files

Conveniently protect your multi-format documents including DOC, PDF and DOCX and many more.

Quick protection operation

Lightning fast protect operation for your selected documents.

Lock and Secure Documents

Using our Protect app you can lock and secure your PDF, DOCX, XLSX, PPTX and ONE files online and free of cost.

Encrypt and Password Protect

With our online free app you can password protect, encrypt and add password to your PDF or other file formats. Once locked, your file becomes safe from unauthorized editing or viewing.

Best File Protection online

Our file locking app does not require any program or software download and can be used online for free.

Free Online File Protection

You can use our PDF, DOCX, XLSX, PPTX and ONE files protection app completely free and online.

How it Works

How to protect documents

  • Upload files to protect them online.
  • Specify password text parameter.
  • Press the 'PROTECT' button to protect your files.
  • Download the password-protected file instantly.
  • Send a download link to an email.

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How to protect Word, PDF and other files

Just use our online protection tool. It is fast, easy to use and entirely free. It is designed to quickly protect documents online.

We support a variety of document, web and e-book file formats, including PDF, DOC, DOCX, RTF, ODT and many more.

You can protect up to 10 files simultaneously.

Each file size should not exceed 100 MB.

At the end of the protection process, you will get a download link. You can download the result immediately or send the link to your email.

All user files are stored on Aspose servers for 24 hours. After that time, they are automatically deleted.

Aspose gives the highest importance and attention to security issues. Please be assured that your files are kept in secure storage servers and protected from any unauthorized access.

Protecting multiple files may be time-consuming sometimes, as it involves data re-encoding and re-compressing.

Learn about different file formats

Indulge yourself into learning more about well-known document and image file formats.

File Information

Microsoft Excel Binary File Format

Files with XLS extension represent Excel Binary File Format. Such files can be created by Microsoft Excel as well as other similar spreadsheet programs such as OpenOffice Calc or Apple Numbers. File saved by Excel are known as Workbook where each workbook can have one or more worksheets. Data is stored and displayed to users in table format in worksheet and can span numeric values, text data, formulas, external data connections, images and charts.

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The most popular file formats to protect

We support a variety of document, web and e-book file formats, including PDF, DOC, DOCX, RTF, ODT and many more.

The app runs on a device with a larger screen (minimum width of 320 pixels) aspect ratio.