What Is The Difference Between Fit And Fill?

Fit keeps every source pixel visible and may add padding. Fill covers every canvas pixel and removes centered overflow. Neither policy stretches the image.

Does Resizing Reduce File Size?

A smaller frame often produces a smaller file, but size is not guaranteed because content, quality, duration and audio also matter. Use Video Compressor for target-size planning.

Can It Make A Small Video Truly 4K?

It can create a 4K-sized frame, but interpolation cannot recreate detail that was not in the source.

Video Resizer

Resize video to exact delivery canvases with aspect-safe Fit or Fill behavior, padding color, audio and quality controls.

Local processing: your media stays on this device.First export downloads about 31 MB of FFmpeg WebAssembly

01 · Source

Source Video

Resize to an exact canvas with a deliberate fit or fill policy.

Drop a video hereor choose a local file · maximum 250 MB / 30 minutes

02 · Settings

Output Controls

Settings are validated before the runtime starts.

Canvas PresetCanvas WidthCanvas Height

Frame Policy

Padding Color

Fit shows the whole frame and pads any unused canvas area.

Output ContainerQuality (CRF 24)Lower values preserve more detail and make larger files.

Remove Container MetadataInclude Primary Audio

03 · Output

Output Workspace

The completed file and processing receipt will appear here.

Open a source, confirm the settings, then run Resize Video.

Codec note: exports run in FFmpeg WebAssembly after a first-use download of about 31 MB. The 250 MB / 30 minutes picker ceiling is not a success guarantee: the complete source and output occupy browser memory, available decoders vary, and large 4K or unusual-codec media may still fail. Processing uses a duration-aware 5–45 minute job timeout. Fast trimming follows source keyframes and is not frame-perfect; re-encoded timing can still vary slightly on variable-frame-rate media.

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What Is the Video Resizer?

The Video Resizer creates an exact output canvas instead of treating resolution as an incidental compression option. Presets cover source size, 4K UHD, Full HD, HD, square and vertical delivery, with custom dimensions up to 33.2 megapixels. Fit preserves the complete frame and pads unused space with a chosen color; Fill preserves aspect ratio while cropping centered overflow. MP4/WebM, primary audio, quality, metadata and exact filter-receipt controls are included.

How It Works

Open a video, select or enter the target canvas, then choose Fit Entire Frame or Fill And Crop. Fit reveals a padding-color control; Fill covers the complete canvas without distortion. Review the planned dimensions and policy warning before the local re-encode.

When to Use It

Use it for platform delivery sizes, presentation canvases, square and vertical social versions, proxy resolutions or a predictable encoded frame size. Upscaling is allowed but cannot invent source detail and can consume substantial browser memory.

Frequently Asked Questions

What Is The Difference Between Fit And Fill?: Fit keeps every source pixel visible and may add padding. Fill covers every canvas pixel and removes centered overflow. Neither policy stretches the image.
Does Resizing Reduce File Size?: A smaller frame often produces a smaller file, but size is not guaranteed because content, quality, duration and audio also matter. Use Video Compressor for target-size planning.
Can It Make A Small Video Truly 4K?: It can create a 4K-sized frame, but interpolation cannot recreate detail that was not in the source.

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