What is the difference between Fit and Fill?

Fit shrinks your whole frame to fit inside the target and pads the rest with black bars — nothing is lost. Fill zooms until the target is covered and crops the overflow — no bars, but the edges are trimmed. The safe-area overlay previews what survives.

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Resize Video

Resolution presets for quality, platform presets for socials — with live safe-area guides on the preview so you know exactly what survives the crop.

Your video never leaves your device

Drop your video here

MP4, WebM, MOV, MKV, AVI — or click to browse

drop works anywhere on this page

Resize video for any platform — without guessing

The hard part of resizing isn't the math, it's knowing what your video will look like after. That's why this tool draws a live safe-area guide on the preview the moment you pick a target: choose TikTok 9:16 with Fill and a dashed outline shows exactly which vertical slice of your horizontal video survives. No more exporting, checking, re-exporting.

Fit vs. Fill, simply

Fill zooms your video until the target frame is covered, cropping the overflow — full-bleed, no bars, but edges are lost (the overlay shows precisely what stays). Fit shrinks the whole frame inside the target and pads with black — nothing is lost, at the cost of letterbox bars. For social verticals, Fill almost always looks better; for screen recordings where edges matter, use Fit.

Presets that match reality

4K / 1080p / 720p / 480p — standard 16:9 resolutions. Downscaling 4K phone footage to 1080p typically cuts file size by 70%+ with no visible loss on most screens.
YouTube 16:9 (1920×1080), TikTok / Reels 9:16 (1080×1920), Instagram 1:1 (1080×1080) and 4:5 (1080×1350) — the exact pixels each platform wants.

Like every tool here, the resize runs in your browser via WebAssembly — no upload, no watermark, no account.

FAQ

What's the difference between Fit and Fill?

Fit pads with bars and keeps everything; Fill crops the edges and fills the frame. The safe-area overlay previews what survives Fill.

Which size should I use for TikTok and Reels?

1080×1920 (9:16). Use Fill for horizontal sources — the overlay shows the surviving center slice.

Does resizing reduce quality?

Downscaling stays sharp at our settings and slashes file size. Upscaling can't invent detail — avoid it unless a platform demands the resolution.

Is my video uploaded to resize it?

No — it's processed in your browser via WebAssembly. No upload wait, no size cap.