Free‑FPS

Open‑source desktop app and scripts to change a video file frame rate (FPS) using FFmpeg.

It does not add effects or alter content; it adjusts playback speed and, if needed, re‑encodes audio.

Originals are never modified.

Download latest release for Windows / macOS

What it does

• Changes video FPS via FFmpeg.
• Keeps or re‑encodes audio if requested.
• No effects, no content edits.
• Writes results to a separate output folder by default.
• Also doubles as a fast video compressor: keep the original FPS and raise compression (e.g., higher CRF or lower bitrate) to reduce file size.

First Run

Your OS may warn or block the first launch because the app is not signed/notarized.

Look here for instructions to allow it: Windows 10/11 or macOS 10.15+

Quick links

• App user guide:
  Беларуская, Deutsch, English, Español,
  Français, Italiano, Polski, Português,
  Русский, Українська

• You can also run the scripts directly with PowerShell or bash/sh if you don't want to use the desktop app.
  
  Scripts user guide: Windows, MacOS.

Desktop app

• Platforms
  • Windows 10 1809+ and Windows 11. Requires Microsoft Edge WebView2 runtime. Older Windows versions are not supported and the app may not start.
  • macOS 10.15+ on Intel and Apple Silicon. Older macOS versions are not supported and the app may not start.
• UI tech is web‑based. Internet Explorer is not supported. Docs/UI render correctly in modern Edge, Firefox, Chrome, and Safari (latest two versions).

Scripts

• Windows PowerShell and macOS shell scripts perform the same conversion with fewer controls.
• FFmpeg and FFprobe must be available (in PATH or standalone). See per‑platform guides above.

Support the project

Tech stack

- Tauri 2 (Rust)
- Vue 3, TypeScript, Naive UI, Vite
- GitHub Actions for builds and releases

For developers

Build from source

• Prerequisites: Node.js LTS, Rust/Cargo, and Tauri prerequisites for your platform.
• Commands:
  • Install: npm i
  • Dev: npm run tauri:dev
  • Build: npm run tauri:build

Licence

This software uses FFmpeg (GPL v3.0). License and source code information available in the app's Help section.

• GNU GPLv3
• FFMPEG_NOTICE