Will my video be stretched?

No. It is scaled to fit the target frame and padded with bars if the aspect ratio doesn't match, so proportions stay correct.

Can I set custom dimensions?

This tool uses the three most common social presets. For arbitrary sizes, resize in a full video editor.

Resize a video

Resize a video to common social aspect ratios — 16:9 landscape, 9:16 story, or 1:1 square. Padded to fit and re-encoded to MP4 in your browser.

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Social-ready presets

Pick 16:9 landscape (1920×1080) for YouTube, 9:16 story (1080×1920) for Reels, TikTok, and Shorts, or 1:1 square (1080×1080) for feed posts. The tool fits your footage to the frame.

Fit without distortion

Instead of stretching, the video is scaled to fit and padded with black bars where the aspect ratio differs. Your subject keeps its correct proportions.

About encoding

Video encoding happens entirely in your browser using WebAssembly. There is no upload and no queue, but that also means your device does the work — expect a large or long clip to take a minute or more.

How to resize video

Drop your video into the zone above.
Choose a target aspect preset.
Press Convert and download the resized MP4.

Related converters

Compress VideoShrink MP4 file size with a quality slider and resolution cap.Trim VideoCut a clip to a start and end time without re-encoding.MP4 to WebMTurn MP4 videos into open, web-friendly WebM (VP9/Opus).