Are my files uploaded?

No. This tool runs entirely in your browser tab. Files are read from your disk into memory and the result is generated locally.

Is it free? Are there limits or watermarks?

Free and open source (MIT). There are no file-size caps, daily quotas, accounts or watermarks.

Yes, once the page (and any engine it needs) has loaded, it keeps working without a connection thanks to the service worker cache.

Home / Creator Studio / Video Chapter Maker

Write YouTube chapters, check them against the rules, and export WebVTT, FFmpeg or podcast chapter files.

Free, no uploads, no sign-up. Runs 100% in your browser.

Chapters are read from plain lines, descriptions or subtitle cues and written in each format in your browser.

Input: Text, SRT, VTT. Output: TXT, VTT, JSON.

Video tools encode on your device, so short clips finish much faster.
Square and 4:5 sizes take the most space in feeds. 9:16 is for stories, reels and shorts.

Are my files uploaded?: No. This tool runs entirely in your browser tab. Files are read from your disk into memory and the result is generated locally.
Is it free? Are there limits or watermarks?: Free and open source (MIT). There are no file-size caps, daily quotas, accounts or watermarks.
Does it work offline?: Yes, once the page (and any engine it needs) has loaded, it keeps working without a connection thanks to the service worker cache.

Subtitle Editor: Create and edit subtitles against a video preview. Set times from the player, split lines, save SRT, VTT or ASS.
Audiogram Maker: Turn a podcast or voice clip into a shareable video with a moving waveform, cover art and a title.
Video Reframe (9:16, 1:1, 4:5): Turn a landscape video into a vertical short, a square or a 4:5 post with a blurred or solid background.
Carousel Maker: Make swipeable text carousels for LinkedIn and Instagram, and export them as PDF or PNG slides.