Reducing bitrate will reduce your file size but may also noticeably reduce your video quality. You can try H.265/HEVC which can reduce file size and produce higher quality at lower bitrates - if your client can use it. Power Director 13&14 Ultimate, Photo Director 6, Audio Dir, Pwr2Go 10
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Thanks AIS, why "if your client can use it"? Is this a hard file to open or something?

Perhaps it is a good idea to find out the limits of the two options you mentioned.

Read this about dropbox:
https://www.dropbox.com/help/5

Read this about youtube:

"Make sure you’re using an up-to-date version of your browser so you can upload files greater than 20GB. The maximum file size you'll be able to upload to YouTube is 128GB and the maximum duration is 11 hours." BUT they MAY reduce the quality of the video.

Have you considered another method of transfer -- like a snail mail - one day delivery of a thumbdrive? Cheap and easy. They can put their comments on the drive and send it back to them. Sometimes the old ways are the best. BY the way, you cannot "protect" your hard work either way. If your clients want to steal it, then they can.

H265 is a very compressed format and the client would need a player that would support it. .
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Thanks Steve K. I actually am bringing my portable hardrive to client tomorrow so we don't loose quality and size.
How can I tell if I personally have a player that supports H265? Would my PD 14 open a video file extension h265?
If it gets compressed so much, will it look blurry? Thanks.

DropBox is so convenient it seems it might make sense to pay for an account. My free account is up to 4.25 GB now, it serves me well.
Due to your need for such a service, maybe you should go for it. I've never had a fail issue with DropBox, all went through. If it's just a test-run, you can easily watermark the video, then after payment, upload the final production. HP Envy Phoenix/4thGen i7-4770(4@3.4GHz~turbo>3.9)
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Let me answer those backwards -

No, the compression does not cause the quality to be visually lower. If you have the space, you could also use H264.

H265 is newer so some players will not handle it yet. H264 is older and most players that will do High Definition will play it.

As for "do you have a player that will do H265", you would have to look at the specs on the player. BTW, Power Director is not a player. Since you made the H265 file with that video editing tool, it will play (preview). When I said player, I was thinking about PowerDVD (which will play H264 94 H26).

I don;t know if the free VLC player will play the H265 but my guess is that it will. .
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BoilerPlate: To posters who ask for help -- it is nice to thank the volunteers who try to answer your questions !
Anything I post unless stated with a reference is my personal opinion.

oh, I produced (and played) the video in H.264. Thanks.