Video FPS Converter
Change a video's frame rate to match a delivery specification, or lower it to reduce the file size.
Convert with this tool
or choose a file from your device — it is processed in this tab and never uploaded
Accepted: MP4, MOV, MKV, WebM, AVI
Files stay on your device. There is no upload, no queue and no watermark, so a conversion works even with the network switched off after the page has loaded.
Supported formats & processing
| Accepted input | MP4, MOV, MKV, WebM, AVI |
|---|---|
| Produced output | MP4 or WebM at the selected frame rate |
| Processing | FFmpeg.wasm (video engine, downloaded on first use) |
| Upload required | No — the file is read locally and never transmitted |
How to use this tool
- Add the videoContainer information is read from the file header.
- Choose the target frame rate24 for film look, 25 for European broadcast, 30 for web, 60 for gameplay.
- Set the qualityA slightly lower CRF compensates for any motion interpolation softness.
- ConvertThe encoder processes every frame in the timeline.
- Check the result cardThe applied rate and the output size are both reported.
About this tool
Frame rate is how many pictures per second the file stores. Cinema uses 24, European broadcast uses 25, web and game capture often use 30 or 60. Delivering the wrong rate to a platform can cause judder, stutter or an outright rejection.
Lowering the frame rate is also one of the most effective ways to shrink a file, because there are simply fewer frames to encode. Going from 60 to 30 fps roughly halves the number of pictures while leaving the resolution and the quality per frame untouched. The tool re-encodes with FFmpeg and reports the target rate in the result card.
Features
- Target rates of 60, 50, 30, 25, 24 and 15 fps
- Lowering the rate reduces the file size proportionally
- Correct re-timing rather than dropping frames at random
- Output to MP4 (H.264) or WebM (VP9)
- Quality control in the same pass
- Suitable for platform delivery specifications
Frequently asked questions
Can I raise the frame rate to make footage smoother?
Raising the rate duplicates or interpolates frames, which does not create new motion information. It makes the file larger and can look artificially smooth. Shoot at the higher rate instead if you need it.
How much does lowering the frame rate shrink a file?
Roughly proportionally. Halving 60 to 30 fps typically removes 40–50 percent of the size at the same quality setting, because motion between frames is also simpler to predict.
Why does my video look like it is stuttering after conversion?
Dropping from 30 to 24 fps removes one frame in five, which is visible on smooth motion. Use a lower rate only when the delivery target requires it.
Does the frame rate affect audio?
No. Audio is timed independently and stays in sync; the tool re-encodes it at the bitrate you select.