オンラインで動画速度を変更 — 遅速・倍速
どんな動画も加速・減速できます。0.25×〜4× から選択。処理はブラウザ内で行われ、動画はプライベートに保たれます。
オンラインで動画速度を変更 — 遅速・倍速 を3ステップで使う
- 1
Select a video
Drag and drop or browse. Supports MP4, MOV, AVI, MKV, WebM up to 2 GB.
- 2
Pick the speed
Choose from presets (0.25×, 0.5×, 2×, 4×) or enter a custom multiplier.
- 3
Download
Browser re-encodes the file and provides a direct download — no upload step.
オンラインで動画速度を変更 — 遅速・倍速 を選ぶ理由
Wide speed range
From 0.25× slow motion to 4× time lapse, and any custom value in between.
Nothing uploaded
Your video is processed entirely in your browser, never sent to a server.
Audio handling
Choose to keep audio (pitch-shifted) or drop it entirely when changing speed.
Free and unlimited
No sign-up, no watermarks, use as often as you want.
オンラインで動画速度を変更 — 遅速・倍速 の利用者
Slow-motion sports
Review a goal or a great play frame by frame by slowing clips to 0.25×.
Cooking time lapse
Speed up a 30-minute recipe video to a watchable 3-minute time lapse.
Funny speed-ups
Create the classic "sped-up voiceover" effect for social media posts.
世界中のクリエイターのために
世界中のクリエイター、ジャーナリスト、学生、研究者のために。
よくある質問
- How fast or slow can I go?
- From 0.25× (quarter speed) to 4× (four times faster). Custom values are supported.
- Does it keep the audio?
- Your choice. You can keep audio (pitch will change with speed) or strip it.
- Is this service free?
- Yes, unlimited and without watermarks.
- Will quality change?
- Quality is preserved during re-encoding. For most content, no visible quality loss.
- Are my files uploaded?
- No. Processing runs in your browser via WebAssembly.
- Does it support all video formats?
- Input: MP4, MOV, AVI, MKV, WebM, FLV, WMV. Output: MP4.