What does Video Merger do?
Tubelexity combines multiple local videos into one ordered output. Compatible clips can use fast stream concatenation, while mixed resolutions, codecs, aspect ratios or audio layouts can be normalized and re-encoded. You can reorder, duplicate and preview clips, choose a fit mode and export one MP4 or WebM without uploading the sources.
How to use Video Merger
- 1Add two or more local videos.
- 2Drag clips into the required order and preview each source.
- 3Use Fast merge only when the compatibility report passes, or choose Compatible merge.
- 4Set resolution, frame rate, fit and transition options, then process and download.
Supported inputs and outputs
Inputs
MP4, MOV, WebM, MKV when decodable
Outputs
MP4, WebM
Practical uses
- Joining camera clips
- Combining an intro and main video
- Building a highlight reel
- Joining portrait and landscape sources with borders
Browser and media limitations
- Fast merge requires matching streams and can fail on unusual time bases.
- Compatible merge re-encodes and can change quality.
- Crossfade currently supports two clips with audio.
- Large combined inputs can exceed browser memory.
How local processing works
Processing runs locally in your browser with FFmpeg.wasm. The media engine is downloaded on first use, but your media is not sent to Tubelexity or a processing server.
Frequently asked questions
Can I merge videos for free?
Yes. Tubelexity combines local videos without paid credits or a watermark.
Can I merge videos with different resolutions?
Yes. Compatible merge normalizes their frame size and uses crop or contain-with-borders.
Does merging reduce video quality?
Fast merge copies compatible streams. Compatible merge re-encodes, so quality depends on the selected setting.
What is the difference between fast and compatible merge?
Fast merge joins matching streams; compatible merge normalizes differing codecs, dimensions, frame rates and audio.
Are uploaded videos sent to a server?
No. The files and FFmpeg processing remain local in the browser.