Screen Recorder

How Screen Recorder works

Record your screen or a window and save the video locally. Uses the browser screen-capture API; the file never leaves your machine and no plugin is installed. Everything happens inside this page: the tool reads your input, runs the calculation or conversion locally, and hands the result back to you. Nothing is transmitted, because there is no backend to transmit it to.

That design choice is deliberate. Most free tool sites upload your files to a server, process them there, and quietly keep a copy. Toolcin cannot do that — the site is a set of static files. If your connection dropped the moment the page finished loading, every tool would still work.

How the capture works

The browser's own screen-capture API asks which screen, window or tab to share, then MediaRecorder records that stream to WebM. Nothing is uploaded and no plugin is installed.

Because the file is produced by the browser's encoder, the format is WebM — playable in Chrome, Edge, Firefox and Android, but not in Safari or on iOS.

What to expect

You get a file whose length equals the recording session, at whatever resolution the shared surface had. Recording a 4K screen produces a large file; recording a single tab produces a small one.

Audio is optional and depends on the browser: system audio can be captured on some platforms, the microphone on others, and never reliably both at once.

Consent and the law

The browser always shows a picker, so the person recording chooses the surface — there is no silent capture. Recording other people's conversations or copyrighted material without permission is a legal problem in most jurisdictions, and the recording is your responsibility.

If you need MP4 for a platform that rejects WebM, convert afterwards.

Good to know

• Works offline once loaded, including on flights and in locked-down networks.
• No file size limit beyond your device's own memory.
• Free to use, with no account and no usage counter.
• Results are produced locally, so they are not logged or shared with anyone.

Questions