Boomerang
Forward then reverse, concatenated. Caps at 8 seconds.
Runs in this tab. The file stays here.
This runs in your browser. Nothing is uploaded. Longer clips take longer here than they would on a fast server — that is the trade-off for not sending the file.
About Boomerang
Concatenates a clip with its reverse in the browser so it plays forward then back. Caps at 8 seconds. Nothing is uploaded.
The Instagram-era loop. Audio is dropped because a reversed soundtrack on a boomerang is rarely what anyone wants. Long clips are cut to 8 seconds so the reverse half fits in a tab. Mute by design; add a track later if you must.
Boomerang runs FFmpeg compiled to WebAssembly in this tab. The first visit of a video or audio tool fetches about 30 MB from this origin; after that it can stay cached. Your file is not in that download and is not POSTed anywhere. GPL FFmpeg, single-thread, same origin, no COEP experiment. That is the same encoder as convert, trim, and compress — this page is just a different argument list, with the same honesty about what the core cannot mux.
You can open the network panel and watch. Encoding a long clip on a phone is slow because it is your CPU. That wait is the trade for not handing the file to a converter you found in a search ad. Reverse and boomerang cap duration so a two-hour file does not try to live backwards in RAM. If a codec inside a familiar extension is missing from this core, you get an error rather than a silent broken file. Subtitle generation and stem splitting are not here; I will not pretend they are. Missing is better than a watermarked demo.
How to use Boomerang
- 1Drop a short clip.
- 2Click Boomerang, then download.
What it won't do
- 8 second cap.
- No audio in the output.
Common questions
Does boomerang upload the video?
No.
Why no audio?
Forward-plus-reverse audio is a mess. Mute by design. Add a track later with replace-audio if you must.
Why the 8 second cap?
Reverse is memory-heavy. Trim first for a longer moment — or don’t, and keep it snappy.
Related tools
Why this one doesn't upload your file
There is no server to upload to. This page is a static file, and the work happens in your browser using the same graphics and WebAssembly code that renders every other site you visit. Your file is read from disk into memory, processed, and handed back as a download. Once the page has loaded you can disconnect from the network entirely and it keeps working. The longer explanation