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  1. Home
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  3. Resize Video

Resize Video

Scale video to a target width while preserving aspect ratio and even codec dimensions.

Use this tool
Browser-local processingNo input upload to TOOLGRIDReview before copy
Formats and processing
Input
H.264/AAC MP4 video
Output
Resized MP4 video
Runtime
WebCodecs + Mediabunny, FFmpeg WASM fallback
Browser-local workspaceStart below with browser-local processing.

Tool code processes selected files and entered content in your browser and does not submit them to a TOOLGRID processing endpoint. TOOLGRID measures tool usage, not the content you enter.

Loading tool…

Browser-basedWhat this tool does

Resize a video locally to 1920, 1280, 854, 640, or a custom even width. Height is calculated to preserve the source aspect ratio.

Processing starts only after you choose files and press the action button. The media engine is not preloaded on the homepage or ordinary tool pages.

Representative tasks

What you can do with this tool

Create a 720p-width copy

Scale a large capture to 1280 pixels wide before web delivery.

Boundaries

What to check before relying on the result

  • Upscaling does not add source detail.
  • The output is re-encoded and can change color or compression characteristics.
Mediabunny documentationffmpeg.wasm documentationMDN WebCodecs API

How to use

  1. 1

    Choose the video file from your device.

  2. 2

    Review the detected media facts and task-specific controls.

  3. 3

    Start the local job, watch progress, or cancel to terminate the worker.

  4. 4

    Play or inspect the downloaded result before replacing the source.

Use Cases
Create a 720p-width copy

Scale a large capture to 1280 pixels wide before web delivery.

Continue the workflow

Choose a width that matches the delivery surface, encode, then inspect text sharpness and aspect ratio.

Tips & Tricks
Start with a short representative file

Confirm codec and browser support before committing device time to a long source.

Keep the source

Every output is a new file. Retain the original until you have completed a full playback check.

FAQ

Is my media uploaded to TOOLGRID?

No. The selected files are written into an in-browser worker file system. The self-hosted encoder assets are downloaded separately, but TOOLGRID does not receive the selected media for processing.

Why can a local media job be slow?

The compatibility encoder runs single-threaded in WebAssembly and is limited by device CPU, available memory, source duration, resolution, codecs, and browser behavior.

What should I verify in the result?

Check playback, duration, seeking, video and audio synchronization, expected tracks, visual quality, and actual file size in the browser or player used by your audience.

Continue this workflow

Useful next steps

Open a nearby browser tool when you need to validate, convert, or reuse the result.

Crop VideoVideo Tools · Local→Compress VideoVideo Tools · Local→Rotate VideoVideo Tools · Local→