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Before changing the frame rate, it helps to know what each common FPS is usually used for. A higher number is not always better. The right choice depends on the source video, your target platform, and whether you want normal playback or slow motion.
24fps: A common cinema and film-delivery frame rate. Use it when your project or target platform requires 24fps or when you prefer its lower-motion cadence. However, simply converting an existing 30/60/120fps video to 24fps does not automatically create a cinematic look, and fast sports, games, or camera pans may appear less smooth.
25fps: Often used in PAL-region and 50 Hz broadcast workflows. Use it when your project, camera, or delivery standard requires it.
30fps: A practical choice for tutorials, vlogs, social videos, and general online playback. It gives smoother motion than 24fps while keeping file size easier to manage than 60fps.
60fps: Good for gameplay, sports, action clips, and screen recordings. It looks smoother but needs more bitrate and storage. If the video is too large or not supported, converting 60fps to 30fps or 24fps can help.
100/120fps or higher: Usually recorded for HFR playback or slow-motion editing. For normal viewing, you can convert 120fps to 24fps or 30fps without slow motion. For slow motion, put the high-fps footage on a lower-fps timeline in a video editor and reduce the speed instead.
Quick rule: When changing FPS for compatibility, keep the normal speed and choose the frame rate required by your device, platform, or editing project. When changing FPS for slow motion, do it in an editor so the extra captured frames are played over a longer time.
🎞️ What happens when you convert 30fps to 24fps?
A normal 30fps-to-24fps conversion keeps the same duration and playback speed, so the converter has to remove about six source frames per second. This is fine for many videos, but motion with quick pans, sports, or repeated patterns can show more judder because the original 30fps cadence was not captured for 24fps delivery.
If 24fps is required, try the conversion and review motion-heavy scenes before processing everything. Frame interpolation can create intermediate frames and sometimes make the result look smoother, but it can also introduce warping, ghosting, or other artifacts. If there is no 24fps requirement and smooth motion matters more, keeping the original 30fps is often the safer choice.
🎬 How to change frame rate in DaVinci Resolve
If you are already editing in DaVinci Resolve, you may not need to pre-convert every clip. Resolve can work with mixed-frame-rate media and conform it to the timeline frame rate. The important part is to decide the project or timeline FPS before you begin editing whenever possible.
Step 1. For a new project, open File > Project Settings > Master Settings, then set the desired Timeline frame rate under Timeline Format and save the project.
Step 2. If an existing timeline is already locked to the wrong FPS, create a new timeline, disable Use Project Settings, open its Format settings, and choose the frame rate you need before adding clips. You can then copy or move the edit into that new timeline.
Step 3. For mixed-frame-rate clips, Resolve can use frame sampling, frame blending, or optical-flow processing depending on your retime/frame interpolation settings. Optical flow may look smoother for some motion, but it requires more processing and can create artifacts in difficult scenes.
💡 Do not confuse Clip Attributes with normal FPS conversion. Changing a clip's Video Frame Rate in Clip Attributes reinterprets how the source frames are played. For example, interpreting 30fps footage as 24fps makes it play slower and longer rather than simply exporting the same-speed video at 24fps. Use this method only when that conforming behavior is what you want.
Besides using the desktop video frame rate converter, there are many online video frame rate converters you can try. They are convenient for small clips because you do not need to install software. The following will take VEED.IO as an example to show you how to adjust video frame rates online for free.
Step 1. Visit https://www.veed.io/tools/video-frame-rate-converter to open the VEED.io video frame rate converter.
Step 2. Click "Adjust video frame rate" and upload the video.
Step 3. On the left side of the interface, scroll down to "Frames Per Second" under the "Project Settings" tab. Then adjust the video frame rate to the value you desired.
Step 4. Then, click "Done" on the top-right corner to export the video.
Online tools are better for short test clips than for large 4K, 60fps, 120fps, or batch conversion tasks. Free plans may limit export resolution, file size, video length, and may add a watermark. These limits can also change over time, so check the tool's pricing or export page before processing important files.
🎯 Actually, it is not recommended to change video fps online if you need stable quality, batch processing, or large-file conversion. FPS changing is CPU-intensive and uploading/downloading large HFR files can take a long time. A desktop converter is usually more reliable for MP4, 60fps, 120fps, and HFR videos.
Q1. Can you convert frame rate?
Yes. With a frame rate converter, you can adjust the frame rate of a video to 24, 25, 30, 50, 60, 120, or a custom value. But note that changing FPS does not automatically improve real quality. Lowering FPS drops frames, while increasing FPS usually duplicates or interpolates frames.
Q2. What's the best frame rate for YouTube?
There is no single best frame rate for every YouTube video. 24 or 30 FPS is enough for most tutorials, vlogs, and talking-head videos. 60 FPS is better for gameplay, sports, and fast-motion content. The safest choice is to upload the video at the same frame rate you recorded or edited it in, unless you have a clear reason to convert it.
Q3. Can I convert 60fps or 120fps to 24fps without slow motion?
Yes. If you set the output frame rate to 24fps in a converter, the video will keep normal speed and extra frames will be removed. This is useful for file size reduction, compatibility, or a movie-like look. If you want slow motion, use a video editor to slow down the high-fps footage on a lower-fps timeline.
Q4. Can I convert 30fps to 60fps?
Yes, you can. However, converting 30 fps to 60 fps usually repeats frames unless the tool uses frame interpolation. The output file may show 60fps, but it will not contain the same real motion detail as a video originally recorded at 60fps.
Q5. Does changing MP4 frame rate reduce file size?
It can, especially when you reduce a high frame rate such as 60fps or 120fps to 30fps or 24fps. But file size also depends on resolution, codec, bitrate, duration, and audio settings. For better compression, adjust the bitrate or use a more efficient codec together with frame rate conversion.
Q6. Should I use CFR or VFR?
For editing, uploading, and device compatibility, CFR is usually safer. VFR can be fine for casual playback, but it may cause audio sync issues or timeline lag in some editors. If your video behaves strangely, try converting it to a constant frame rate.
Q7. Why can 30fps to 24fps look choppy?
A same-speed 30fps-to-24fps conversion has to discard some temporal information, so motion-heavy scenes can show more judder than the original. This is most noticeable with fast camera pans or action. Interpolation can sometimes smooth the cadence, but it may introduce visual artifacts. If 24fps is not required, keeping the original 30fps avoids this extra conversion.
Changing the video frame rate can make your video run smoothly on your device, reduce file size, match an editing project, or avoid possible playback and upload issues.
For small clips, you can try an online frame rate converter. If you are editing a larger project, DaVinci Resolve can manage a project/timeline frame rate and mixed-frame-rate clips, but it is best to decide the timeline FPS before editing. For MP4 files, large videos, 60fps/120fps footage, HFR videos, or batch pre-conversion, WonderFox HD Video Converter Factory Pro is more direct. It lets you change video FPS to 24, 25, 30, 50, 60, 120, or a custom value while also adjusting format, codec, resolution, bitrate, and other settings in one place.
Kevincy joined the WonderFox team in 2014 and has been a senior columnist ever since. With over two decades of experience in the video editing industry, he shares tutorials, tips, and how-to guides on video/audio processing and personal DVD backups. Family-oriented and passionate about helping others, he is dedicated to making video and audio processing easier for readers.
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