Tricks for manipulating PDF files

Our website supports the processing of multiple PDF files at the same time. To select multiple files for processing, after you click select files button, the dialog will pop up. Generally, there are 3 approaches to select multiple files for Windows or Mac.

• For Windows
• Holding Ctrl button and click files, this can select/unselect your clicked files
• Click file A then hold Shift button and click file B, this can select files between A and B
• Ctrl+A, this will select all the files
• For Mac
• Holding Command button and click files, this can select/unselect your clicked files
• Click file A then hold Shift button and click file B, this can select files between A and B
• Command+A, this will select all the files

• Simple and brute approach
• Try the following steps to see if the web page works without internet connection
• Open the web page you want to test, such as https://pdf.worthsee.com/pdf-merge
• Disconnect your internet connection, such as unplug the network cable or disable Wi-Fi
• Use the web page to process your PDF files to see if everything works
• Technical approach
• Using browser build-in Developer Tools, press F12 in the web page (typically this works for Chrome, Firefox and other mainstream browsers). If the approach not works for you, please search how to open Developer Tools for your browser.
• Switch to "Network" tab, this tab monitors all the network traffic for the current web page, you may see several network requests there
• Use the web page to process your PDF files, there will be some new network requests, pay attention to those new network requests and verify if your files were uploaded by them or not
• A simple way to verify is focus on the size column, pay attention to the size greater than your file size, your file is safe if total network size is much less than your file size
• Request URLs that begin with "BLOB" are local requests, these requests are safe and never need internet connection

• If you encounter any problems, please take a look at our FAQ pages, if this doesn’t help, please let us know Contact Us