Lossless merging (supported by FFmpeg) is nearly instantaneous because it simply copies data. Re-encoding takes longer but allows you to join clips with different settings. How to merge two or more video files in Microsoft Clipchamp
Depending on your skill level and operating system, you can choose from these popular options: merge vcmp4
While primarily a player, it has a "Convert/Save" feature for merging. Note that it works best when all videos share identical formats, resolutions, and frame rates. Note that it works best when all videos
Convenient "no-install" solutions for small files (typically under 500MB or 1GB). Step-by-Step: Quick Merge with VLC Open VLC Media Player . Go to Media > Open Multiple Files . Click Add to import your video clips in the desired order. Click the arrow next to Play and select Convert . Go to Media > Open Multiple Files