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 / Safe Zone Checker

See where Reels, TikTok, Shorts and Stories cover your video with buttons and captions before you post.

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

Everything is drawn or encoded on your device, so drafts stay private until you post them.

Input: JPG, PNG, MP4, MOV. Output: PNG.

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.

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.
Caption Styler: Turn SRT captions into bold short-form captions with word highlight, then burn them into your video or export ASS.
Audiogram Maker: Turn a podcast or voice clip into a shareable video with a moving waveform, cover art and a title.
Carousel Maker: Make swipeable text carousels for LinkedIn and Instagram, and export them as PDF or PNG slides.