Unprotect PDF

https://online2pdf.com/remove-pdf-password

The site is similar to the one described above, dragging the file and saving it under a new name.
The restriction at a time is no more than 20 files (which is hardly needed) and up to 50 Mb.

I like the site described above, but sites are Are not available. So it's good to have a choice.

In addition, this site allows you to convert documents to PDF and vice versa.

https://smallpdf.com/unlock-pdf

TThe site allows you to easily and easily remove the password from the PDF file.

How it works

1. Drag the file with the mouse in the field of the site or select on the computer by the link, if the file is on a Dropbox cloud or Google Drive, just specify a link to it.
2. The site re-creates the file without a password.
3. Save it to disk or cloud (Dropbox, Google Drive). You can compress to save traffic and space.

https://www.ilovepdf.com

All PDF tools in one place.

Free editing and editing of PDF files.
Add a signature to your PDF document or edit and complete the PDF forms directly on your device.

Functions

1. notes, annotations, comments, draw or paste images into PDF document.
2. Signature PDF document.
3. Fill in PDF forms.
4. Merge PDF files into one.
5. Separate PDF files.
6. Compress PDF files.
7. Convert office documents to PDF files. Convert your PDF files into editable office formats such as Word, Excel, Powerpoint.
8. OCR Scanner.
9. Extract images from PDF in high quality.
10. Convert your own images to one or more PDF files.
11. Rotate certain PDF pages and adjust their location in your document.
12. Unlock PDF.
13. Add page numbers to PDF.
14. Watermark PDF.
15. PDF Sharing: Connect to your Google Drive and/or Dropbox to select and/or share PDF files from the cloud storage.

Free service which enables you to unlock password protected PDF files.