Convert WTV video to MP4 online for free.
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ファイルと選択した出力形式を確認しています。
MP4 (with H.264 video and AAC audio) is the universal video format — plays on every phone, TV, browser, and video-editing app. Convert to MP4 when uploading to YouTube, Instagram, TikTok, or any platform that doesn't specify otherwise. MP4 is the default output for smartphone recording and the expected format for shared / embedded video.
Same footage, different container. Get a file that plays where you need it to, with sensible defaults for codec, bitrate, and framerate.
Free-tier uploads are capped at 10 MB — fine for short clips and screen recordings, tight for anything long-form. Pro handles files up to 1 GB and batch jobs of up to 20 videos. Because video work is compute-heavy, sign-in is required on the free plan for anything past a minute of source video.
MP4 のデフォルトは、そのコンテナと最も互換性のあるコーデック (MP4 の場合は H.264、WebM の場合は VP9 など) に設定されます。同じ品質でより小さなファイルが必要な場合は、H.265 などの最新のコーデックを選択します。ただし、古いデバイスでは H.265 を再生できないため、最初にビデオがどこに送信されるかを確認してください。
Video conversion takes proportionally longer than audio or image work — roughly a few seconds per second of source video on a typical 1080p clip. The output downloads immediately once ready, and both the source and result are deleted from our servers within 30 minutes.
A file called WTV tells you almost nothing about what's inside — the container is a box that could hold several different codecs. The codec is what actually determines quality, size, and compatibility. Converting WTV to MP4 usually means picking a new codec too; the defaults above are what most people expect to work everywhere.
Six scenarios where the format swap is the actual job — not incidental to something else.
Recent iPhones save videos as MOV wrapped around H.265, which older Windows machines and many web apps can't decode. Converting to a widely-supported MP4 makes the clip playable everywhere.
HTML5 <video> reliably plays MP4 across every mainstream browser. Some formats (MOV, MKV, unusual containers) trigger downloads instead of playing inline. Converting to MP4 first avoids the "why isn't this playing" support thread.
Final Cut loves MOV/ProRes. Premiere handles most things but chokes on variable-framerate phone MP4s. DaVinci Resolve wants specific codec support. Converting to what your editor actually understands prevents hours of debugging "why is playback laggy".
電子メールの添付ファイルの上限は 25 MB です。 Slack の無料プランの上限は 1 GB です。多くの場合、フォーム ポータルは 100 MB 未満を要求します。最新のコーデック交換 (H.264 → H.265) では、通常、同じ品質でサイズが 40 ～ 60% 削減されます。これは通常、解像度に影響を与えることなく制限に適合するのに十分です。
Old AVI files, ancient FLV downloads, MPEG-2 rips from a decade ago — legacy formats work but eat disk space. Converting to a modern MP4 halves storage without losing quality, and future-proofs the collection against the day players stop shipping with legacy decoders.
YouTube, Instagram, TikTok, and LinkedIn all publish their own "recommended encoding" specs. Converting to a spec-matching MP4 before upload skips the platform's own re-encode and produces cleaner playback quality.
Read format, playback, upload, and editing guides related to Free Online WTV to MP4 Converter.
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