Frame interpolation for smoother, higher-FPS video
Browser-based tool for increasing video framerate via frame interpolation. The in-between frames are built from motion: the fast mode finds it on the GPU, the Quality mode in FFmpeg WebAssembly, and the AI mode with the RIFE neural network.
How to increase video FPS
Drop or pick an MP4, MOV, WebM or MKV.
×2, ×3 or ×4 — the tool auto-picks the best engine for your device.
"Smoother" keeps the duration; "Slow motion" stretches time.
Final MP4 H.264. Compare before/after with the slider right on the page.
Turn 24/30 FPS into 60, 120 or 240 FPS — no installation
File queue
Download AI model?
The RIFE-v4 model (~25 MB) is downloaded once and cached in your browser.
This engine could not process the video
Your device's hardware decoder rejected this file. The video can be processed in software instead — slower, but it works with any file. Pick an option:
Features
Supported formats
Input: MP4, MOV (including iPhone slow-mo .mov), WebM, MKV. Output: MP4 with H.264 codec — universal for playback and social media.
Why increase video FPS
Higher FPS makes motion look visually smoother — especially important for slow-motion (e.g. 120 FPS slowed 4× yields a smooth 30 FPS playback), gameplay capture, action-cam footage and any fast-motion scene. Interpolation computes intermediate frames between existing ones: the fast mode finds motion vectors on the GPU, Quality does it in FFmpeg, and the AI mode uses the RIFE neural network.
Frequently asked questions
The fast mode or the AI mode — which should I use?
The fast mode is the everyday choice: the GPU works out where things moved between two frames and draws them in between. On our test clips — game scenes and live footage — it matched the neural network while spending milliseconds per frame. The AI mode (RIFE) is worth turning on for hard live footage — foliage, water, a crowd — where it can be slightly more accurate, if you have time to wait.
Why does targeting 240 FPS take so much longer than 60?
Because the work is the frames that do not exist yet. Going from 30 to 60 means inventing one frame for every one you have; going to 240 means inventing seven. The source is decoded once either way, but the interpolation runs seven times as often and the encoder has seven times as many frames to write. If the result only needs to look smooth, 60 or 120 gets most of the way there for a fraction of the wait.
Why is the file 120 FPS but the motion looks like 30?
That is what frame blending looks like: an in-between frame mixed from its two neighbors shows an object in its old place with a see-through copy in the new one, so the eye still sees the original 30 steps of motion per second. Until October 22, 2026 the fast mode worked exactly that way; now it builds frames from motion. The other reason is the screen: a 60 Hz monitor shows at most 60 frames per second, so the difference between 60 and 120 FPS is visible on 120–144 Hz screens or after slowing the video down.
Will the video be perfectly smooth?
On most scenes — yes. Where motion cannot be read — a cut, a flash, spray — the tool does not invent it but blends the neighboring frames smoothly: at a cut that is a dissolve 1/30 of a second long. Right at the edge of a fast-moving object the outline can tear slightly; the AI mode handles that a little better.
Does the duration double?
No. Duration stays the same — only the number of frames per second increases. Audio stays in sync: even if a game recording had FPS drops, the new frames are placed by the source timeline rather than by count, and the drops are filled with in-between frames.
Can I make slow-motion?
Yes. Boost FPS to 120 or 240, then use the video speed tool to slow down — you get smooth slow-motion playback.
Experts on this topic
Work through it with a specialist — an online lesson or consultation, times shown in your time zone.
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