How to merge videos
- Drop your collection of video clips into the browser queue.
- Organize the playback sequence using the up and down arrows beside each file.
- Pick an output canvas resolution or keep the dimensions of your opening clip.
- Hit Merge Videos and download your finished reel as a single MP4 file.
Stitching console splits and mobile video takes
Consoles and action cameras frequently break long gameplay sessions or continuous vlog recordings into separate four-gigabyte chapters. This merger assembles those fragmented segments back into one unified file, following the exact sequence you configure using the directional queue buttons.
You can drop raw iPhone MOV clips right alongside OBS WebM captures and camera MP4 takes without converting them beforehand. The rendering pipeline unifies container formats, decodes the individual streams, and exports one clean MP4 named after your lead file with the suffix -merged.mp4.
Fitting mixed aspect ratios without picture distortion
Creators often juggle landscape camera footage alongside vertical mobile b-roll within the same compilation. The output frame automatically adopts the resolution of your first queued clip, or you can explicitly lock the canvas height to 1080p, 720p, or 480p depending on where you plan to publish.
Whenever an imported clip fails to match the primary canvas geometry, the engine fits the entire picture within the frame and applies neat black letterbox or pillarbox bars. Your original media is never stretched out of proportion or cropped along the boundaries.
Unified audio synchronization and rendering workflow
If some of your video snippets contain live sound while others are silent screen recordings or b-roll cutaways, audio sync can easily derail in basic concatenators. Here, the engine fills any silent video segment with an equivalent duration of blank audio, ensuring downstream commentary and gameplay audio never drift.
Encoding runs locally using a 31 MB WebAssembly build of ffmpeg running on a single CPU core, producing H.264 video with AAC stereo audio at 160 kbps. Because processing is constrained to one processor core, picking Balanced quality or 720p resolution helps render longer video projects much faster.
Questions
Can I combine videos recorded in completely different formats?
Yes. You can mix MP4, MOV, MKV, WebM, AVI, and other major formats within the same queue; all clips are decoded and encoded into a standard MP4 file.
Does the tool add wipe or fade effects between clips?
No. The merger joins clips end-to-end as direct cuts in your chosen queue sequence without adding artificial wipes or crossfades.
Why does merging require at least two video files?
Joining requires a minimum of two clips to form a sequence; to adjust the format or resolution of a single file, use the standard video converter or resizer instead.
Can I send the merged video directly to another tool?
Yes. Once rendering finishes, tap the Continue with button to pass your merged MP4 straight into the video speed changer, resizer, or audio extractor.