Convert a horizontal video to vertical (9:16 or 1:1) - with a blurred background pad or as a crop. Locally, no upload.
Running locally on your device ...
Running locally on your device ...
0%
Your files never left your device
No. Everything runs in your browser - your file never leaves your device. How this is verifiable
A video shot in landscape needs to run on Instagram Reels, TikTok or YouTube Shorts - all of which expect a vertical format. This tool offers two routes there: the standard method from CapCut, InShot and similar apps (the original picture stays fully visible, scaled down and centred, with a blurred, enlarged version of the same picture filling the rest of the canvas) or a classic, centred crop.
Important and honest: with the blurred background, NO picture content is lost - only the crop mode cuts off the sides or top/bottom. The blurred background re-renders every frame onto a canvas (foreground plus blurred background composited together), which needs a hardware video encoder in your browser; without one, the tool honestly reports that instead of producing an unusable output.
Everything runs locally in the browser with mediabunny (MPL-2.0, self-hosted, no third-party CDN) on the browser's native WebCodecs API. Your video is not uploaded.
| Input formats | MP4, M4V, MOV, MKV, WEBM |
|---|---|
| Auto-conversion | PNG, GIF |
| Output format | MP4 |
| Batch processing | No |
| Processing | Locally in your browser (WebCodecs) |
| File upload | None |
Limitations: The blurred-background method needs a hardware video encoder in your browser - without one you get an honest error instead of a risky output. Crop mode loses picture content at the edges. Audio track stays unchanged as long as the browser can encode a matching audio codec. One file per run, ~600 MB limit.
No. The whole conversion happens locally in your browser.
Blurred background if the full picture should stay visible; crop if an edge-to-edge, fully filled look matters more than the complete picture content.
No, the original picture stays fully visible, just scaled down and centred.
Every frame is recomposited on a canvas. On a pure software encoder that can crash the browser tab, so hardware is required.
9:16 for Stories/Reels/TikTok and 1:1 for a square feed post.
Boomerang loop · Video speed · Video thumbnail · Reverse video · Images to video