[plz-remove-card]

> Size of the files can be large in many GBs.

> Security is the main concern.

> Tool should be web based.

From your question it kinda sounds you actually have 3 main concerns, not just security. I can't give you any suggestions for web based tools but I can suggest:

1. Obtain a public SSH key out-of-band with the party that needs the large file and give them access to an SFTP share with that key.

2. Upload the file to a private S3 bucket and send them a signed link[1]

[1] https://docs.aws.amazon.com/AmazonS3/latest/userguide/ShareO...

[akashcoach]

Thanks for your suggestion. Unfortunately the users of the system are not too technical so some of these steps might be too much for them. Is there a user friendly tool in this space of secure file exchange?