I encountered the same problem when downloading videos from TikTok — the quality dropped significantly, and the video became blurry. It turned out that the problem was in some services that automatically compress the file. I can recommend tiktok downloader Snaptik — it saves videos without a watermark and without losing quality. Sometimes it’s worth trying to download through a different browser or with a good internet connection to avoid compression. This method really helped to preserve the clarity of the video.