1. Nén file PDF
https://www.compress2go.com/ (miễn phí)
2. PDF to Excel free
https://thebestpdf.com/
https://www.ilovepdf.com/
https://smallpdf.com/
3. Clone website
https://saveweb2zip.com/en
4. Gỡ lỗi chia sẻ facebook
https://developers.facebook.com/tools/debug/
5. Gỡ lỗi chia sẻ zalo
https://developers.zalo.me/tools/debug-sharing
6. Chia sẻ file miễn phí, không cần đăng ký, không quảng cáo
