HLS Manifest Validator

Check an HLS stream URL for common issues. Validates the manifest structure, checks for SCTE-35 ad markers, and reports on variant streams.

HLS stream URL (.m3u8)

What this checks

Manifest format — Validates the M3U8 header and basic structure
Master vs. media playlist — Detects whether the URL is a master manifest (multi-bitrate) or a media playlist (single quality)
Variant streams — Lists available bitrate variants from a master manifest
SCTE-35 markers — Detects ad cue-out markers in the manifest
Segment count — Reports how many segments are listed and estimated duration

Note: This tool fetches the manifest from your browser. The stream must be accessible without authentication and must have CORS headers that allow browser requests. Streams behind Cloudflare or other WAFs may block browser fetches.