M3U8 to MP4

Tool Guide

Introduction

M3U8 to MP4 is a free online HLS stream downloading and conversion tool. Enter an M3U8 URL to convert HLS streams directly to MP4 video files for local download. Powered by FFmpeg.wasm, all processing happens locally in your browser—your stream URL is never sent to a server.

Core Features

1. M3U8 to MP4 Conversion: Enter an M3U8 streaming URL and convert it to MP4 format for download.
2. Fast Stream Copy Mode: Uses stream copy technology without re-encoding, preserving original quality with fast conversion speed.
3. Re-encoding Mode: Re-encodes with H.264/AAC codecs for better compatibility across devices.
4. Sample Streams: Built-in public test streams for quick testing.
5. Progress Display: Real-time conversion progress tracking.
6. Pure Browser Processing: Stream URLs and video data are processed entirely in the browser, never sent to a server.

How to Use

Step 1: Paste an M3U8 streaming URL (ending in .m3u8) into the input box.

Step 2: Select conversion mode. Fast mode uses stream copy (recommended), re-encoding mode offers better compatibility.

Step 3: Click the "Convert" button to start downloading and converting the stream.

Step 4: After conversion completes, click "Download MP4" to save the file locally.

Use Cases

FAQ

Q: Does the M3U8 to MP4 tool upload my stream URL to a server?

A: No. This tool uses FFmpeg.wasm to process everything locally in your browser. Your stream URL and video data never leave your device.

Q: What is the difference between Fast and Re-encoding modes?

A: Fast mode uses stream copy (-c copy) without re-encoding, preserving original quality with maximum speed. Re-encoding mode uses H.264/AAC codecs for better device compatibility but takes longer.

Q: Why can't some M3U8 URLs be converted?

A: Possible reasons include: invalid or expired URLs, missing CORS configuration on the server, authenticated streams, or network access issues. Please verify the URL and server CORS settings.

Q: Will the converted MP4 lose quality?

A: Fast mode uses stream copy with no quality loss. Re-encoding mode compresses with H.264 which may slightly reduce quality but ensures maximum compatibility.