what this is
Video tools that never upload your files
A set of 29 free utilities for converting, compressing and resizing video — all of which do their work inside your own browser instead of on somebody else's server.
The problem
Almost every free online converter works the same way. You upload your file, it waits in a queue on a server you know nothing about, and some minutes later you download a result.
For a holiday clip that hardly matters. For a recorded client call, an unreleased edit, a medical scan or anything filmed in a private setting, it matters a great deal — your footage has been copied onto a machine you do not control, kept for a period you were never told, under terms you did not read.
The other half of the problem is practical. Uploads of large files fail halfway with no explanation, free tiers cap file sizes, and results arrive with watermarks or behind a sign-up.
What we did instead
Browsers became capable of running a real media encoder some years ago. clipinstrument loads a WebAssembly build of FFmpeg — the same engine behind most professional video software — directly into the page, and your own processor does the work.
Your file is read from your disk by the browser and never leaves the tab. There is no upload step, no queue, no account, no watermark and no size policy. You can disconnect from the internet mid-conversion and it will still finish, which is the simplest proof that nothing is being sent anywhere.
The honest trade-off
Browser encoding runs roughly two to four times slower than an installed desktop program, and a browser tab has a memory ceiling that very large files will eventually hit. For clips of a few minutes — which is most of what people convert — neither limit is something you notice.
If you are re-encoding a two-hour recording, a desktop program is genuinely the better tool, and we will tell you so on the page rather than let you find out after twenty minutes.
What it will not do
There is no field anywhere on the site to paste a link into. The tools cannot download video from streaming services, and they cannot remove or bypass copy protection — a protected file simply fails to open. Everything works on files already on your own device.
The tools
Convert between formats
Audio
Make it smaller
Fix and reshape
Reference and calculators
Who it is for
Streamers preparing clips for Discord, TikTok or Shorts. Editors handed footage in an awkward format. Podcasters pulling audio out of a recording. Anyone trying to get a video under an email, chat or upload limit — and anyone who would simply rather their files stayed on their own machine.
Cost
Free, with no paid tier and nothing to sign up for. Because your machine does the processing, there is no server bill to recover, which is the whole reason this can stay free without advertising at you or selling anything.
Everything starts from the homepage — see all 29 tools.
Questions
Written by a small independent project rather than a company with a support desk. Bug reports, tool requests and privacy questions all go to contact@clipinstrument.com, and are read by a person.