You can save it as a PDF file with the help of the printing function of the computer. Open the file with the browser that came with your computer, then click the Print button, and click Save as PDF file in the options that appear. The specific operation method is as follows:

1. Find an HTML file on your computer, right-click it, and select the browser you want to use to open it.

2. After the page jumps, you can see that the HTML file has been opened with a browser.

3. Right-click the page and select the Print button.

4. In the printer dialog box that appears, click the drop-down arrow of the target printer and select Save as PDF.

5. After saving as a PDF, click the Save button.

6. Select the storage location of the file in the pop-up file saving dialog box, and click the Save button.

7. At this time, open the location where the file is saved to view the PDF file generated by HTML, and click Enter.

8. After the page jumps, enter the interface of opening PDF file, and then complete the conversion from HTML file to PDF file.