Antivirus online

https://virusdesk.kaspersky.ru

The leading antivirus downloads the file and thoroughly checks it.

https://safeweb.norton.com

It consists of two different tests of the security of the remote computer. In the first of them, Security Scan, a general system protection check is performed, and in the second, Virus Detection is a virus scan.

Main features

Security Scan Includes the main online tests of the system:

• Hacker Exposure Check - Check for the availability of unknown and unauthorized Internet connections on your computer
• Windows Vulnerability Check - Check for vulnerabilities in Windows
• Trojan Horse Check - Protecting your computer from Trojan horses g
• Antivirus Product Check - Check for anti-virus product in the system for total protection against viruses
• Virus Protection Update Check - Check the computer's protection against the latest virus threats

https://www.eset.com/us/home/online-scanner

Using ESET Online Scanner, using only a web browser, you can detect and delete on your computer various types of malicious software: viruses, trojans, Internet worms, spyware (Spyware), etc.

Online scanner From ESET uses ThreatSense technology and the anti-virus databases of ESET Smart Security/ESET NOD32 Antivirus products, while constantly updating.

https://sitecheck.sucuri.net

Enter a URL (ex. sucuri.net) and the Sucuri SiteCheck scanner will check the website for known malware, blacklisting status, website errors, and out-of-date software.

https://quttera.com

Get malware scanning & removal, web application firewall, domain blacklist check, and other essential tools for the safe and trusted website.

The service allows you to check an unrealizable file of any format, except for encrypted (password-protected) files.

The analysis of files is based on unique algorithms that were developed specifically to protect against new, yet unknown (0-day) exploits and malicious programs.

They do not require knowledge and updating of signatures, and give an exact (non-probabilistic) answer to the question whether the file is infected.

https://www.virustotal.com

Checking files or sites for viruses.
The site itself is not an antivirus, but it checks the file or site right away in a number of antivirus programs.