There's something that feels riskier about a website recording your screen compared to installing a dedicated app — you're granting a browser tab access to everything on your display, which sounds like it should require more trust, not less. Here's what's actually happening technically, and what's worth checking.
The Browser Controls the Permission, Not the Website
Screen recording in a browser runs through the Screen Capture API (the getDisplayMedia() function), a standard built into desktop Chrome, Firefox, and Edge; Safari’s support is more limited, and most mobile browsers don’t offer it at all. When you click "Start Recording" on any site using it, the browser itself — not the website's code — shows the permission dialog and lets you choose exactly what to share: your whole screen, one application window, or a single browser tab. A website can request permission, but it cannot see or record anything until you explicitly approve that dialog and pick a source.
That permission also lasts only for the current capture. When the recording stops, the website loses access, and the next recording triggers a fresh share dialog. There’s no hidden “always allow” setting for screen sharing that a site can quietly reuse later.
What a Website Can and Can’t Access
| Item | Can the site access it? |
|---|---|
| Your screen before you approve the share dialog | No |
| The tab, window or screen you picked | Yes, until you stop sharing |
| Other tabs or windows you didn’t pick | No — only what is visible in the source you chose |
| Your microphone | Only if you allow it in a separate browser prompt |
| System audio | Only if you switch it on in the share dialog (Chrome and Edge) |
| Files on your computer | No — screen capture gives the page video and audio, not file access |
The important word in that table is visible. If you share your entire screen and then open your email, the email is in the recording. The browser protects you from a site grabbing things you didn’t choose, but it can’t protect you from things you show on purpose or by accident.
Where the Recording Actually Lives
For a client-side tool like this one, the video is captured, encoded, and assembled entirely inside your browser using the MediaRecorder API — nothing is streamed or uploaded to a server while you record, or afterwards. When you stop, the recording stays in that browser tab until you click Download, which saves it to your device, or Delete, which discards it. A quick way to verify this for any tool: open your browser's network tab (F12 → Network) while recording and watch for outgoing video data — if it's genuinely client-side, you won't see any.
Once downloaded, the file (a WebM video with a name like screen_recording_Medium_480p_<date-time>.webm) is an ordinary file in your Downloads folder. From that point, its safety is the same as any other file on your computer: who you send it to, and where you upload it, is up to you.
Tab, Window or Entire Screen: The Privacy Trade-Off
- A Chrome tab is the most private option. Only that tab’s content is captured, so notifications, other tabs and your desktop stay out of the video. It’s also the best choice for capturing a page’s sound in Chrome and Edge.
- A single window captures one application. Pop-ups from other apps won’t appear, but a window can’t include system audio.
- Entire screen captures everything — including notifications, chat previews and anything you open by mistake. On Windows and ChromeOS it can include system audio in Chrome and Edge. Use it only when you genuinely need to move between several apps.
What to Actually Check Before You Trust a Recorder
- Does it ask for more than screen access? A screen recorder legitimately needs microphone access if you want narration, but broad, unrelated permission requests are a signal to look closer.
- Is there a visible recording indicator? Browsers show their own indicator the moment screen capture starts — in Chrome and Edge, a bar naming the site that is sharing your screen, with a “Stop sharing” button — and some operating systems, such as macOS, add one too. These are drawn by the browser or OS, not the website, so the page itself can’t fake them.
- Can you stop it instantly? You can always revoke screen-share access immediately via the browser's own “Stop sharing” control, regardless of what the website's own stop button does. On EachConvert’s recorder, doing this ends the recording and keeps what was captured so far.
- Does it require an account? A recorder that only works after sign-up is more likely to be storing your videos on its servers. EachConvert’s recorder needs no account and adds no watermark.
A Quick Pre-Recording Privacy Checklist
- Turn on Do Not Disturb or Focus mode so message previews don’t pop up.
- Close tabs and documents you don’t want on camera, especially email, banking and password managers.
- Share a single tab whenever the task fits in one tab.
- Only tick Include Microphone if you’re narrating, and use Mute while you’re not speaking.
- Watch the finished video before sending it — a two-minute check is easier than recalling a shared file.
The Short Version
Browser-based screen recording isn't inherently less safe than a desktop app — the permission model is arguably more transparent, since the browser (not the website) is the one deciding what you're allowed to share, and it never happens without your explicit, per-session approval. The bigger privacy risk is usually human: sharing more of the screen than you meant to. For a practical walkthrough of every option, see our guide on how to use a screen recorder for tutorials. If you plan to crop or post the recording on social media afterwards, our guide to common aspect ratios explains which shape each platform expects.
Frequently Asked Questions
Can a website start recording my screen without me knowing?
No. Screen capture always requires you to pick a source in the browser’s own dialog, and the browser shows a sharing indicator for as long as capture is running.
Is browser recording safe on a work computer?
Technically, the browser’s protections are the same. But your employer may have rules about recording internal systems or customer data, and managed browsers can block screen capture entirely. Check your company’s policy before recording anything confidential.
What happens to my recording if I close the tab?
Because the video exists only inside that tab until you download it, closing the tab discards it. Nothing was sent to a server, so there’s no copy anywhere else.
Why does my video show a black box where a streaming video was?
Many streaming services use DRM protection that blocks screen capture. That’s a deliberate restriction by the service, not a sign that the recorder is broken or doing anything unusual.
Try it yourself: open our Online Screen Recorder, open F12 → Network, and make a short test recording of one tab — you’ll see that no video data leaves your browser, and nothing is saved anywhere until you choose to download it.