Saving video file in a smaller format. Help please!

[kenzee34]

I don't know much about how to save files in different formats or compressing them so any help would be appreciated.

I transferred film videos to digital files for someone and now I am trying to fit them all onto a flash drive but just a tiny bit short on space to fit them all. Is there a way to compress them without losing quality and so she can still open them fine on her computer?

[hech54]

Is there a way to compress them without losing quality

No.

[Case]

Video files do not compress well with traditional lossless compression utilities like ZIP, RAR, etc. So that won't help you.
You could re-encode to a lower bitrate, perhaps with a better codec (H.264), that would produce smaller files. But it takes a long time.
Or just get a bigger flash drive. Or a second one. That seems to be the best solution to me.
I can’t afford me one, but there are flash drives available with capacity upto 1 TB!
But I do make good use of flash drives with 32 GB and 64 GB capacity. Not cheap enough to be careless about returns, but very handy for “sneakernet”.

[pandy]

I don't know much about how to save files in different formats or compressing them so any help would be appreciated.

I transferred film videos to digital files for someone and now I am trying to fit them all onto a flash drive but just a tiny bit short on space to fit them all. Is there a way to compress them without losing quality and so she can still open them fine on her computer?

This depends from materials (movies) you have, also all lossy compression will loos some information but this information may be irrelevant from subjective point of view thus from your perspective you will not loos any quality. Also there is a chance to use lossless compression.

As you see there is many answers and each answer is valid as general. You need provide more details then we can focus on reducing size at minimal or not quality loss.

[rumplestiltskin]

Assuming you have a relatively recent machine, use something like Handbrake or MP4Tools or any one of a hundred other apps to transcode the video to the desired format with a lower bitrate and, optionally, slightly smaller frame size and/or frame-rate (to compensate for the lower bitrate). You may also reduce the audio bitrate. Depending on the size reduction you need, perhaps the audio bitrate reduction is all you need and you can pass-through the video. MP4Tools will do this.