Why quality drops
Every platform compresses videos to save space and data. If you save a posted video and upload it again, it is compressed a second time, and the blur and blocky patches add up.
Screen recordings are even worse, because they capture a compressed stream at your screen's resolution, sometimes with interface elements.
Keep a master file
Export a high-quality master from your editor before posting anywhere and store it in a dated folder or cloud drive. This file is the source for every platform.
If you edited directly in an app, check whether it lets you save the draft or the original to your phone before posting.
Use sensible export settings
Match the resolution and frame rate of your footage, for example 1080x1920 at 30 frames per second. Changing frame rate or upscaling a small clip rarely helps.
Choose a high quality or high bitrate preset. A larger file gives the platform more detail to work with when it compresses.
Upload carefully
Upload on a strong Wi-Fi connection, since some apps reduce quality on weak or mobile data. Check the app's settings for a high-quality upload option and switch it on.
After posting, watch the video on another phone. If it looks soft, wait a little, since some platforms process higher-quality versions after the first upload finishes.
Frequently asked questions
Does sending a video over a chat app reduce quality?
Many chat apps compress videos unless you send them as a document or file. To move masters between devices, use cloud storage or a cable.
Will upscaling to 4K make my video sharper online?
Not if the source was lower resolution; it only makes the file bigger. Export at your footage's real resolution unless you filmed in 4K.