Convert 120 fps to 30 fps
Going from 120 to 30 fps keeps 1 frame out of every 4: 90 frames are dropped each second, and the clip keeps its exact length and speed.
- No upload: runs in your browser
- Free, no watermark
- Exports MP4 (H.264 + AAC)
Drop or choose a video
MP4, MOV, WebM, MKV. It stays on this device.
New frame rate
More options
What happens to the frames
| Pattern | Every 4 source frames → 1 output frame |
|---|---|
| Per second | 90 frames dropped |
| Frame duration | 8.33 ms → 33.33 ms |
| Length and speed | Unchanged; audio is copied across in sync |
When you need it: Turning a high-frame-rate recording into a normal-speed 30 fps file. If you wanted slow motion instead, use the slow motion maker, which keeps every frame.
Want the general tool with every rate? Go to the FPS converter. To use a high frame rate for slow motion instead, open the slow motion video maker.
Other frame-rate conversions
Questions people ask
How do I convert 120 fps to 30 fps?
Choose your video in the tool on this page (30 fps is already selected), press “Convert frame rate” and download the MP4. It runs in your browser, so the file is not uploaded.
Does converting 120 fps to 30 fps lose quality?
Each remaining picture is the same as before; you lose motion samples, not sharpness. Motion looks a little less fluid, which at 30 fps is the normal look for that rate. The file is re-encoded with H.264, a small loss that is usually invisible.
Will the video get shorter or longer?
No. Frame-rate conversion keeps the duration and the speed. To slow a 120 fps clip down instead, use the slow motion maker.
How long is one frame at 120 and 30 fps?
At 120 fps each frame lasts 8.33 ms; at 30 fps, 33.33 ms (1000 ÷ frame rate).