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About this tool
Audit SRT and WebVTT cue timing, overlaps, reading-speed signals, and line limits locally with configurable editorial thresholds.
Caption Speed & Collision Checker is a free video & audio tool that runs entirely in your browser — nothing to install, no account to create, and your data never leaves your device. Open the page, add your input, and get a clean, copy-ready result in seconds.
Open Caption Speed & Collision Checker on AltFTool — it loads instantly in your browser.
Upload or drag in the file you want to work with.
Adjust the settings and preview the result.
Download the finished file to your device.
Process images, audio, video, and documents directly in your browser — files never leave your device.
See the result before you export, so the final file is exactly what you expect.
Download output that's ready for your website, presentation, or client hand-off.
Yes — Caption Speed & Collision Checker is completely free on AltFTool, with no signup, no trial limits, and no hidden costs.
Yes. Caption Speed & Collision Checker runs in your browser, so what you enter or upload stays on your device instead of being sent to a server.
Audit SRT and WebVTT cue timing, overlaps, reading-speed signals, and line limits locally with configurable editorial thresholds. It's built for quick, everyday video & audio tasks with results you can copy or download straight away.
Yes — Caption Speed & Collision Checker works in any modern browser, on desktop, tablet, and mobile, with the same features everywhere.