Is this tool private?

Yes. All processing happens locally in your browser. No data is uploaded.

What extras does this tool have?

Extras: (1) Core function, (2) Batch mode, (3) Copy results, (4) Download, (5) History, (6) CSV export, (7) Custom options, (8) Validation, (9) Warnings, (10) Stats, (11) Multi-format, (12) Configurable, (13) Preview.

Audio Runs in your browser

Slow Motion Maker

Create slow motion videos with speed control and frame interpolation reference. 100% private. 100% private.

100% Private Works Offline Instant

Source duration (s)

Source FPS

Speed factor (0.05-5)

Interpolation

Target FPS (optional)

Bitrate (Mbps)

Presets

Source frames

300

Output frames

600

Output duration

20.00s

Real-time ratio

2.00×

Interpolated frames

300

Output FPS

Est. size

9.5 MB

Speed

0.5×

FFmpeg command

ffmpeg -i input.mp4 -filter:v "setpts=2.000*PTS,tmix=frames=2,fps=30" -filter:a "atempo=0.500" output.mp4

Plan summary

Source: 10.00s @ 30fps
Speed: 0.5×
Interpolation: blend
Output: 20.00s @ 30fps
Frames: 300 → 600 (300 interpolated)
Real-time ratio: 2.00×
Estimated size: 9.5 MB at 4 Mbps
Slow source 10s @ 30fps by 0.5× (frame blending (crossfade)) → 20.00s @ 30fps.

FFmpeg: ffmpeg -i input.mp4 -filter:v "setpts=2.000*PTS,tmix=frames=2,fps=30" -filter:a "atempo=0.500" output.mp4

Privacy: all computations are local. The FFmpeg command uses setpts for time stretching and minterpolate/tmix for frame interpolation.

Create slow motion videos with speed control and frame interpolation reference. 100% private. 100% private. Everything runs locally in your browser — your data never leaves your device.

How to use

Enter your input in the tool above.
Adjust any options to your preference.
Use the Copy or Download buttons to save the result.
Everything happens locally — your data never leaves your browser.

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