How to Validate Your Streaming Links Safely
M3U Studio reads a selected playlist locally, builds a de-duplicated queue of its URLs, and asks your browser to fetch those URLs directly. The playlist is not uploaded to an M3U Studio checker server. However, each destination receives a network request from your device and may see your IP address and request headers. Only test URLs you are authorized to access.
Understanding Status Badges
The implementation reports online, slow, dead, or pending. A request that resolves in under two seconds is shown as online; a slower resolved request is shown as slow. A timeout or fetch failure is shown as dead. These labels describe the browser request outcome, not video quality, authorization, codec support, or continuous availability.
How Client-Side Validation Works
The checker uses `fetch` with `GET`, `mode: no-cors`, `cache: no-store`, and an AbortController. It aborts after the fetch promise resolves, or at the selected timeout. With an opaque no-cors response, browser security prevents inspection of the actual HTTP status and response body. A resolved request therefore means only that the browser reached a response path; it does not prove that the stream is playable.
Improving Validation Performance
You can adjust connection concurrency. Testing 5 to 10 streams simultaneously speeds up validation. Avoid using more than 20 concurrent connections on low-spec hardware or mobile connections to prevent rate-limiting and connection false-positives.