Is the audio track preserved when cropping?

Yes. The primary audio track is preserved and synchronized with the cropped video stream.

Video Cropper & Social Resizer

Crop and resize MP4, MOV, and WebM videos locally for social platforms (9:16 Vertical, 1:1 Square, 16:9 Widescreen, or 4:5 Portrait) with custom crop coordinates and preserved audio.

Drop an MP4, MOV, or WebM video to crop & resize for social platforms

9:16 Vertical, 1:1 Square, 16:9 HD, and 4:5 Portrait presets · Preserves synchronized audio

Zero server upload · Files never leave your device

VISUAL CROP & ASPECT PRESETS

Aspect ratio presets

Crop X offset (px)

px

Crop Y offset (px)

px

Crop width (px)

px

Crop height (px)

px

Export quality

CROPPED VIDEO OUTPUT

Load a video above to crop its frame dimensions and export a playable file.

Loading tool workspace…

Method and assumptions

Video frames are decoded via Mediabunny and WebCodecs, cropped to the specified even-numbered [left, top, width, height] rectangle, scaled to the target output dimensions, and re-encoded using your browser's supported hardware video encoder (H.264/AVC, VP9, AV1, or HEVC) while copying or transcoding the primary audio track.

Common mistakes and edge cases

Hardware WebCodecs encoders require even pixel widths and heights (multiples of 2); odd dimensions are automatically rounded to the nearest even pixel.

How to use

Drop an MP4, MOV, or WebM video into the workspace (or load the 3-second sample clip).
Select a social aspect-ratio preset (9:16, 1:1, 16:9, or 4:5) or enter custom X, Y, Width, and Height pixel values.
Select an export quality preset and click Apply crop & export.
Preview the cropped video and click Download.

Example

Load a 640×360 widescreen clip and select the 1:1 Square preset: the tool computes a centered 360×360 crop box and exports a playable 360×360 video with audio intact.

Frequently asked questions

Why are odd crop dimensions rounded by 1 pixel?: Hardware H.264 and VP9 video encoders require even pixel widths and heights (multiples of 2) for chroma subsampling.
Is the audio track preserved when cropping?: Yes. The primary audio track is preserved and synchronized with the cropped video stream.

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This tool is provided for general informational and workflow purposes only. It does not constitute financial, investment, tax, or professional advice. All calculations run in your browser; no input data is transmitted or stored.