Join clips into one video and enhance it with audio, subtitles, and transitions.
Provide URLs for the videos you want to combine (minimum 2, maximum 3 videos)
Add background music, subtitles, and transition effects
Combine your videos with the selected settings
Merging videos is the simplest way to turn multiple clips into one coherent output. VideoComposer lets you join clips in sequence and optionally add background audio, burn subtitles into the output, or apply a crossfade transition between clips.
To keep results consistent, inputs should share the same format. The tool produces an MP4 output, which is broadly compatible and easy to share. If your inputs are in different formats, convert them first for a smooth merge.
The merge workflow is asynchronous, so you can submit a job and come back when it is finished. Developers can integrate the same flow with the API to automate merging in products or pipelines.
Merging works best when clips share the same format and similar resolutions. Converting inputs to a common format first reduces errors and makes transitions look smoother.
If you plan to add subtitles, provide an SRT or VTT file and the tool will burn it into the output. Use UTF-8 subtitle files for best results and test a short clip before running large merges.
When your merge videos online job completes, you will receive a downloadable output URL. You can save the result locally, share it with a teammate, or feed it into another tool such as the trimmer or converter. For repeatable workflows, use the API to store outputs in your own system and automate the next step.
Concatenation works best when codecs, frame rates, and resolutions match. Converting inputs to MP4 with the same dimensions produces the most reliable output.
Crossfade transitions require re-encoding, so they add processing time. Use short fades and limit the number of transitions for faster results.
Order clips intentionally and run a short test merge first. This helps confirm audio and subtitle alignment before processing a longer sequence.
If inputs have different audio lengths, the output may follow the shortest audio track. When supplying external audio, the output will match that file length, so plan your audio accordingly.
If clips come from different devices, normalize them first to avoid black bars or stretched frames. A quick conversion step usually fixes mismatched resolutions before the merge.
Both terms usually mean joining clips into one file. The merge tool concatenates clips in order to create a single output.
Inputs should share the same format for best results. Convert files to a common format first if needed.
Yes. You can include a separate audio URL to mix with the merged output.
Yes. Provide a subtitle file URL and the tool will burn the subtitles into the merged video.
Quality depends on input sources and settings. Keeping formats consistent helps preserve quality.
Yes. You can set a crossfade duration to blend between clips.
Yes. The API supports the same merge parameters with asynchronous job processing.
Automate video merging by submitting a list of URLs and optional audio or subtitle files. The API returns a job ID you can track until completion.
Use this approach for batch processing, internal tools, or user-generated content workflows.
If you collect clips from users, the API is ideal for stitching them into a single asset for review or publishing.
