Pingdom

https://pagespeed.web.dev/

https://www.faxdao.com

https://bigjpg.com/

https://drive.google.com/drive/folders/1uRXg_krKHPrQneI3F2GNcSVRoCgkqESr

https://www.apowersoft.cn/free-audio-recorder-online

https://www.pexels.com/zh-cn/

http://www.1ppt.com/

http://www.pdfdo.com/image-to-txt.aspx

https://wormhole.app/

https://www.uipuzi.com/

https://www.gaitubao.com/tupian-wenzi/

https://ppt.sotary.com/