Why this tool is useful
Combine several short visual segments in a deliberate order while their contents stay in the current browser tab.
Local File Tools · runs locally
Private Video Merger
Join two to four browser-decodable videos in selection order as one real WebM file without uploading the source clips.
Ready. Your working data stays in this browser.
Files and capture streams stay on this device. Processing uses browser APIs only; nothing is uploaded to YTSave, the media API or a proxy.
How it works
The browser decodes each selected clip, fits its frames into the first clip's canvas and records one continuous local WebM timeline.
Practical example
Select an opening, demonstration and closing clip in order, join them, then verify each source duration in the result report.
Validation
The calculation is deterministic and explains validation errors instead of silently changing invalid input.
Privacy boundary
Input and output remain in this tab. Copy and download happen through browser APIs without a server upload.
Result passport
Every run reports its tool mode, timestamp and input/output size so transformed data can be audited.