What resolution presets are available?

Standard presets covering common resolutions (like 1080p, 720p, and 480p) are available, alongside the option to enter fully custom pixel dimensions.

Will resizing to a smaller resolution reduce file size too?

Generally yes, since a smaller frame size means less pixel data to encode per frame, resizing down typically reduces file size as a side effect, though the exact reduction also depends on the bitrate settings used.

Can I upscale a video to a higher resolution?

Yes, though upscaling doesn't add detail that wasn't in the original — it enlarges existing pixel data to fill the new dimensions, which can look softer than genuinely higher-resolution source footage.

Does resizing change the video's aspect ratio?

Standard presets typically maintain the original aspect ratio; custom dimensions give you full control if you specifically need a different ratio, though that may introduce letterboxing or cropping depending on how you configure it.

How long does resizing take?

Processing time depends on your video's length, original resolution, and your device's processing power, since re-encoding happens entirely on your own hardware.

Is my video uploaded to a server?

No. Every operation runs locally in your browser using a real FFmpeg engine compiled to WebAssembly. Your video is never transmitted anywhere.

Is this video resizer free with no limit on how many videos I resize?

Yes. This free online video resizer has no daily limit, no per-file cost, and no watermark added to the resized output.

What resolution should I choose for social media stories or reels?

Vertical formats built for mobile viewing generally call for a taller-than-wide custom resolution rather than one of the standard landscape presets — check the specific platform's current recommended dimensions and enter those as custom width and height here.

Does resizing a video to a smaller resolution speed up processing on my device too?

Downscaling itself still requires a full re-encode of the video, so it doesn't skip processing time entirely, but a smaller target resolution generally completes somewhat faster than a very high target resolution given the same source footage.

Can I resize a video and change its aspect ratio at the same time, like landscape to square?

Yes, entering custom width and height that don't match the source's original aspect ratio changes both dimensions and ratio in one step, though depending on your settings this may introduce letterboxing (black bars) or require cropping to avoid stretching the image.

Will resizing down to a lower resolution make the video file noticeably smaller?

Generally yes — a smaller frame size means less pixel data to encode per frame, so resizing down typically reduces file size as a side effect, on top of whatever benefit dedicated compression would add separately.

Can I resize a video to a larger resolution than the original?

Technically yes, but upscaling can only stretch existing pixel detail rather than add genuinely new visual information, so a video enlarged beyond its original resolution will look softer or less sharp than footage actually recorded at that higher resolution.

Does resizing a video change its frame rate?

No, resizing changes the video's pixel dimensions only; frame rate stays exactly as it was in the source unless changed separately with Change Video FPS.

What resolution should I choose for uploading to most video platforms?

1920x1080 (standard HD) remains a safe, widely compatible choice for most platforms and viewing devices, balancing detail and file size well for typical use.

Resize Video

Change video resolution to a standard preset or custom dimensions.

Processed entirely in your browser. Your file is never uploaded anywhere.

Why resize video with Tools Root

Different platforms enforce different resolution expectations — a mobile app might want 720p to save bandwidth, an archival copy might target the original 4K, and a specific ad placement might require exact custom dimensions. This free video resizer gets your video to whatever the destination requires.

Presets for speed, custom dimensions for precision

Standard resolution presets cover the common cases quickly, while fully custom width and height inputs handle specific requirements a preset wouldn't match.

A free video resolution changer for every platform

Whether it's downscaling a large 4K export for faster uploading or hitting an exact custom pixel dimension for an ad placement or social platform, this tool re-encodes video at the target resolution directly in the browser, with no software install and no cost.

Common use cases

Downscaling a 4K video to 1080p for faster uploading, resizing a video to match a specific platform's recommended dimensions, preparing a smaller-resolution version for mobile viewing, standardizing a batch of videos from different sources to one consistent resolution, or reformatting footage to a vertical resolution for mobile-first platforms.

Resizing alongside other video edits

Resizing pairs well with Compress Video for an even smaller final file, and with Crop Video if you need to change the aspect ratio without stretching the image.

Choosing a target resolution for where the video will be watched

A video destined for a small mobile screen or a quick social preview does not need the same resolution as one meant for a large monitor or television, and resizing down to match the actual viewing context both reduces file size and speeds up any further processing, like uploading or additional editing.

Resizing without distorting the original picture

Setting only a target width or only a target height, while leaving the other dimension to scale automatically, keeps the video's original aspect ratio intact and avoids the stretched or squeezed look that comes from forcing both dimensions to specific values that do not match the source footage's actual proportions.

How to resize a video

1Upload your video file.
2Choose a standard resolution preset, or enter custom dimensions.
3The tool re-encodes the video at the new resolution.
4Download your resized video.

Frequently asked questions

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