What's the difference between resizing and compressing a video?

Resizing changes the actual pixel dimensions every frame is stored at — fewer total pixels, which usually also shrinks file size. Compressing keeps the same resolution but adjusts how efficiently each frame is encoded. For footage that doesn't need its original resolution, resizing typically saves more size than compression alone.

Will resizing distort my video's proportions?

No — the width is always calculated automatically from your chosen height to preserve the original aspect ratio, so the picture never stretches or squashes.

Can I upscale a video to a higher resolution?

You can select a preset larger than your source, but the tool only stretches existing pixels rather than adding real detail — it won't look as sharp as footage actually captured at that resolution.

Why is the output always MP4?

Resizing requires a full re-encode regardless of source format, so the tool standardizes on MP4 with H.264/AAC for broad compatibility.

What resolution should I pick for web embedding?

720p is a common, balanced choice for most embedded web players — it looks sharp on typical screen sizes while keeping the file noticeably smaller than 1080p.

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Resize Video

Change a video's resolution — 1080p, 720p, 480p, or custom — no upload needed.

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Resize Video

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Drop any video file here

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

Target resolution

px height (width auto)

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Compress Video

Compress video file size without losing quality

Your files never leave your device. All processing happens locally in your browser — nothing is uploaded to our servers.Files are never stored on our servers · No tracking of your file contentsPrivacy Policy

What is Resize Video?

Resize Video changes a video's actual pixel dimensions — not its quality setting or bitrate, but the width and height every frame is stored at. It accepts MP4, MKV, AVI, MOV, and WebM as input, scales to a standard resolution preset (1080p, 720p, 480p, or 360p) or a custom height, and always saves the result as an MP4.

This is a different lever from compression: lowering resolution reduces the actual pixel count every frame carries, which is often the single biggest factor in file size since halving both width and height cuts total pixels to a quarter. It's the right tool when a video genuinely doesn't need its original resolution — footage destined for a small embedded player, a quick preview, or a platform with its own resolution cap — rather than when you just want a smaller file at the same resolution, which Compress Video handles instead.

The whole process runs inside your browser via FFmpeg WebAssembly, so your clip is never uploaded anywhere.

Want a smaller file at the same resolution instead? Compress Video adjusts quality rather than pixel dimensions.

How It Works

FFmpeg's scale video filter resamples every frame to the target height while automatically computing a proportional width (keeping the original aspect ratio intact), then re-encodes the result as H.264 video with AAC audio. The width is always rounded to an even number, since most video codecs require even dimensions.

How to Use

1
Upload any video file
MP4, MKV, AVI, MOV, or WebM.
2
Pick a target resolution
Choose 1080p, 720p, 480p, 360p, or enter a custom height.
3
Click Resize Video
FFmpeg scales every frame to the new height, keeping aspect ratio.
4
Download the resized video
Save the finished MP4 at the new resolution.

Who Uses This Tool

📱

Freeing Up Storage

Resize 4K phone footage down to 1080p or 720p when the full resolution isn’t needed for how it will be viewed.

🌐

Web Embedding

Scale a video down to a size that matches a website’s embedded player, cutting load time.

📤

Platform Upload Limits

Reduce resolution to meet a platform’s recommended or maximum upload dimensions.

Why Choose This Tool

Automatic Aspect Ratio

Width is always computed to match your chosen height — no manual math, no distortion.

Works With Any Common Format

One tool handles MP4, MKV, AVI, MOV, and WebM sources.

Fully Local Processing

FFmpeg WebAssembly runs entirely in your browser — nothing is uploaded.

Also Try

Compress Video Crop Video Video FPS Converter Trim Video

Key Benefits

Standard 1080p, 720p, 480p, and 360p presets, or a custom height
Keeps the original aspect ratio automatically
Accepts MP4, MKV, AVI, MOV, and WebM as input
Browser-based — your clip is never uploaded to a server
No watermark added to the resized output

Frequently Asked Questions

Also Known As

resize video online freechange video resolution onlinevideo resizer 1080p 720p freeshrink video dimensions onlineresize mp4 resolution browservideo resolution converter free

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