How to insert large logos/pictures and resize down without pixelation?

Try making layer of logo a smart object (right click on layer, convert to smart object). It will save the size inside, and you can resize it Shift+T without pixelation in the main file. Any time you can flatten it, and as I remember it may save the vision of pixels same

Ah, of course! DIGITAL SIGNAGE!

Like this one:

In that case a couple of tips:

• PPI/DPI is COMPLETELY irrelevant. You work at the sign's native resolution, which would be 704px width and 208px height. Create your Photoshop document at that resolution. The 72ppi is really meaningless, but since they want a 72ppi setting, just give them what they want - so select 72ppi when creating your new document. The 704x208px setting is ESSENTIAL, though. Keep that.
• This is a very low resolution to work at, but that isn't very important, since these billboards will be viewed for at most 1-2 seconds, and at distances of 400-600 feet. It is also the nature of the technology: a group of 4 large LED lights form "coloured pixels" - 2xred, 1xgreen, and 1xblue.

Like this:

This results in a VERY low resolution billboard, but it is quite effective, and very bright.

• When you import your high-resolution logo in this format, details will be lost. Resolution is very low, and thin lines will be lost. You must thicken thin lines to provide the contrast you need for the art.
• Other tips when designing: Outdoor Advertising Design Tips & Best Practices - Blue Line Media

• Also read the following document: http://adamsoutdoor.com/spec-sheets/Digital-Best-Practices.pdf

Simply stated, you CANNOT retain the same sharpness as your original artwork/logo. You MUST scale it down into that tiny photoshop image, and you MUST adjust it manually if details are too subtle and lines too thin.

You can adjust the sharpness by applying a sharpness filter. You can create more contrast with more obvious contrast-rich colours. You SHOULD NOT use a white background - too bright, and often not allowed.

And make sure to "test" your sign design by placing it in a dummy sign/image:

Here is one:

Just open this in Photoshop, then copy and place your finished sign image and use free transform to fit in into the grey area. Finally, set the layer blend mode to "Overlay". This will give you an indication whether things are too small or not.

This should help you on your way. Again, you MUST design your billboard design in a 704px width and 208px height Photoshop document. No way around that. It's the PHYSICAL resolution limit of that digital billboard.

Good luck! When you send your image to them, make sure to test it on a test digital billboard first. The above dummy image is only for rough testing and get an overall feel of the end result.

You did not answer What is a digital billboard is 208x704 all the pixels the billboard displays. What physical size is it.

You started statin. 704x208 72DPI the would make your billboad  9.778" by 2.889" that is a very small billboard.

We would need more information:

- is this meant for a web banner (not a billboard-->print)?

- are you allowed to use SVG for the web banner?

If you are required to deliver a 208x704px web banner or graphic, and your logo is scaled down to that bitmap size, it is obviously going to look pixellated. That is the nature of the beast: low resolution bitmap --> low resolution art.

This png you posted look like only part of you logo and the png is 796px by 636 nearly 4 times wider then your resized logo a blow up that has pixilated.  A billboard 208 pixels high x 704 pixels wide How big are you going to paint in these pixels so the image will be billboard size.  Where are you coming from are you a troll?