Movie timing
Updates the global timescale and duration fields used by the container.
Local MP4 patcher
High-FPS metadata, patched privately.
Upload120 updates MP4 timing headers in your browser. Your video stays on this device, and the actual frames are left untouched.
Drop video files here
or drag in MP4, MOV, or M4V videos.
For the best result, upload the patched file from a desktop browser. Mobile apps may re-encode the video.
Multiplier
Choose the same timing patch used by the app.
Queue
Ready files appear here.
No files yet. Drop a video above.
How it works
Only the timing metadata changes.
Upload120 inspects the MP4 structure, estimates video FPS from sample timing, and rewrites movie and media timing headers. It does not create new frames or alter image quality.
Track timing
Updates timing fields on each media track so the file stays internally consistent.
FPS estimate
Reads sample deltas to estimate the source frame rate before patching.
Settings
Output preferences
About
Local-only web companion for Upload120.
The web version focuses on patching files in the browser. For source code and desktop releases, use the project links.