Resize Video for YouTube

Get your video into the perfect resolution for YouTube Standard (1920×1080) or Shorts (1080×1920) — free, in your browser, with no upload required.

Resize YouTube Video Free →Free · No signup · No upload

YouTube's algorithm favors videos that are uploaded in the correct resolution and aspect ratio. Standard YouTube videos perform best at 1920×1080 (1080p, 16:9), while YouTube Shorts requires 1080×1920 (9:16 vertical). Uploading a video in the wrong format can result in black bars, letterboxing, or reduced recommendation visibility. Resizor lets you resize video for YouTube in seconds, directly in your browser — no software to install and no server upload.

Select your video, choose the YouTube Standard or YouTube Shorts preset, and Resizor encodes a high-quality H.264 MP4 file ready for YouTube Studio. The encoding uses hardware acceleration via the WebCodecs API, so processing is fast even for long clips. Everything runs locally on your device, so your footage is completely private.

How It Works

Upload Your Video

Drop any video file into the tool — MP4, MOV, WebM, MKV and more are supported.

Pick a YouTube Preset

Choose YouTube Standard (1920×1080) for regular uploads, or YouTube Shorts (1080×1920) for vertical content.

Download & Upload

Export your YouTube-optimised MP4 and upload it straight to YouTube Studio.

Why Choose Resizor?

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No Upload Needed

Your video stays on your device the entire time. Processing is done locally in your browser.

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1080p & Shorts Ready

Presets for YouTube 1080p (16:9) and YouTube Shorts (9:16) — both at the exact recommended resolutions.

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Hardware Accelerated

WebCodecs uses your GPU for encoding, so even 4K videos are processed quickly.

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Free, No Watermark

Completely free to use with no limits, no signup, and no watermarks on exported files.

Frequently Asked Questions

What is the best resolution for YouTube videos?

YouTube recommends 1920×1080 (1080p, 16:9) for standard uploads. For higher quality, 2560×1440 (1440p) or 3840×2160 (4K) are also excellent. The minimum recommended resolution is 1280×720 (720p).

What size should YouTube Shorts be?

YouTube Shorts should be 1080×1920 pixels (9:16 vertical aspect ratio), under 60 seconds long. Resizor's Shorts preset exports exactly this format as an H.264 MP4.

What video format does YouTube prefer?

YouTube accepts MP4 (H.264 video, AAC audio) as the preferred format. MOV, WebM, and AVI are also supported. Resizor exports H.264 MP4 which processes fastest on YouTube's servers.

Can I resize a vertical video for a YouTube standard upload?

Yes. Resizor will re-encode your vertical (9:16) video into the 16:9 frame. You can choose to fit (with black bars on the sides) or fill (cropping top/bottom) the frame.

Is there a file size limit?

Resizor itself has no file size limit. YouTube's upload limit is 256 GB or 12 hours, whichever is less. For most content creators Resizor's output will be well within that limit.

Resize Video for YouTube — Start Now

100% free, runs in your browser. No signup required.

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