Free tool · runs in your browser

Video Resizer

Resize any video to a standard resolution — 360p, 480p, 720p, 1080p, 1440p — or a custom width and height, entirely in your browser. Keep the aspect ratio (letterboxed to the target) by default, or turn it off to stretch.

How to use this tool

  1. 01

    Upload your video

    Any format FFmpeg supports — it stays in your browser.

  2. 02

    Pick output resolution

    Choose 360p–1440p or a custom W×H — match your target platform's spec page if cross-posting.

  3. 03

    Confirm aspect ratio handling

    Keep aspect ratio on for safe results (letterboxed); off allows stretching to the exact dimensions.

  4. 04

    Resize and download

    Re-encoding is required, so larger source files take longer; preview before downloading.

Why this matters

Reframing or downscaling a clip — a horizontal interview into vertical 9:16 for TikTok, a 4K capture down to 1080p for review — used to mean opening a desktop editor and rendering twice. Browser-side resizing collapses that into a 30-second flow with no upload of your footage.

The single decision that matters is what happens to the aspect ratio, so this tool makes it one explicit toggle (kept and letterboxed by default, stretch when off) instead of burying it. Output is even-dimensioned, faststart MP4 with the audio passed through untouched. When you're matching a specific platform, check its exact target on the platform specs first.

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FAQ

No. Scaling a 480p clip up to 1080p just stretches the existing pixels with an interpolation filter — it can't add detail that was never captured, so the result looks soft. AI upscalers are different: they hallucinate plausible new detail from a trained model, which can look sharper but introduces invented texture and is far slower. This tool does conventional resizing, so use it for downscaling and reframing, not for rescuing low-res footage.

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