Video Converter — a whole copy of ffmpeg, running in a browser tab
This page carries the real ffmpeg, compiled to WebAssembly. Your file is handed to it inside the tab, converted there, and handed back. Nothing is uploaded, there is no server, no account and no advertising.
Containers and codecs
Questions
Are my videos uploaded anywhere?
No. The engine is a program running beside this page, not a service somewhere else. You can disconnect from the network after it has loaded and everything still works.
Why is the first run slow to start?
The engine is a 30 MB download the first time. It is then kept in this browser's own storage, so later visits start straight away and work offline.
How fast is it?
Slower than a desktop program, and honestly so: WebAssembly gets one core and no hardware encoder. Expect roughly real time for 720p and several times slower for 4K. Short clips are comfortable; hour-long films are a job for a desktop tool.
What is stream copy?
It lifts the existing video or audio stream into a new container without touching the pixels. Instant and lossless, but only possible when the target container accepts that codec — MP4 will take H.264, WebM will not.
Why is there no AV1?
The engine here is built without an AV1 encoder. It would be many times slower than H.265 in a browser anyway. AV1 files still open fine as input.
Free, ad-free and open to anyone. Part of biasa.my.id — a small collection of calm, privacy-first browser tools.
biasa · converter
The whole of ffmpeg, sitting inside a browser tab.
An old 3GP off a dead phone, a MOV out of a camera, an AVI from a hard drive nobody has opened in fifteen years — drop it in, choose what it should become, and it is converted right here. The file never leaves this device.
11 containers · trim and resize · video to GIF · nothing uploaded
