Company

About Mastik

Mastik is a free, browser-based toolkit for converting, compressing and editing your own video and audio. No account, no install, nothing uploaded.

What Mastik is

Mastik is a free toolkit for the everyday jobs you do with your own video and audio files: convert between formats, compress a clip to a smaller size, make a GIF, extract audio, or trim and mute a video. There is no account, no app to install and nothing to sign up for. It started in 2024 and has grown into a set of fast, privacy-first browser tools. The site is available in 15 languages.

Who builds it

Mastik is built and maintained by a small independent team that cares about fast, no-nonsense tools. We are reachable at support@mastik.io and we read everything that arrives there.

How it actually works

Our tools run entirely inside your browser using WebAssembly. When you pick a file, it is read, processed and handed back on your own device — it is never uploaded to a server. The first time you use a tool, your browser downloads a small one-time engine (about 30 MB) and caches it; after that, everything runs locally and even works offline.

What we do not keep

We do not require an account, and we do not build a library of the files you process or run a database of your activity. Because the tools work on your device, your files never reach us in the first place. What little we do collect is described plainly in our Privacy Policy — mainly standard analytics and the advertising described there.

How Mastik pays for itself

Mastik is free to use and is funded entirely by advertising, so there is no paywall, no subscription and no premium tier. In the EU, EEA, UK, Switzerland and Canada, ads and non-essential storage stay off until you explicitly opt in, and you can change your mind at any time. We would rather show an ad than sell your data or lock a working tool behind a payment.

Use it responsibly

Mastik is designed for the files you already have and have the right to use — your own recordings, footage and audio. Please respect copyright and only convert or edit content you are entitled to. If you believe something on the site infringes your rights, our DMCA / Copyright Policy explains exactly how to reach us.