To make the most of your images, it’s important to share them at their very best quality, and knowing where to tweak these settings on any app will give you the freedom to adjust them in every situation. You get three options: Auto (recommended), Best quality, and Data saver. WhatsApp hasn’t gone on record saying exactly what specs the auto mode uses, or how it decides which settings to pick in any given occasion. But if you want to make sure your photos always look their best when you share them, choose Best quality. You’ll see a message telling you that best quality photos are larger and can take longer to send, so if you don’t have a particularly fast connection then you might want to use Data saver sometimes as well. Not only that but there’s very little in the way of information about whether these platforms compress your photos at all. If you really want to avoid apps changing the quality of your pictures and videos, use an instant messenger that has these settings available, or use direct links through apps like Dropbox, for example. You’ll have to choose between Standard or High. Signal doesn’t offer any information about the details of these two alternatives, but High is the one to pick if you want to maximize the quality of the media you’re sharing. From the mobile app, tap your profile picture (top right), then Photos settings, Backup and sync, then Upload size and Original quality.