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Resize Your Videos to Any Resolution Resize videos to any resolution or dimension in your browser.

Video Resizer illustration
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Video Resizer

Resize videos to any resolution or dimension in your browser.

1

Upload Video

Drag and drop your video file or click to browse.

2

Set Size

Choose a preset resolution or enter custom dimensions.

3

Resize & Download

Click Resize and download your resized video.

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What Is Video Resizer?

A Video Resizer is a software application designed to change the dimensions of a video file to a specified resolution, allowing users to resize videos online without losing quality. It is commonly used by social media content creators and video editors who need to resize video for social media platforms with specific requirements, such as changing the video resolution to 1080p or 720p. One specific problem it solves is enabling users to reduce the file size of their videos while maintaining an acceptable level of quality, making it easier to upload and share them online.

The tool is particularly useful because it provides a range of preset resolutions, including 1080p, 720p, 480p, and 360p, which can be selected with a single click. Additionally, users can enter custom dimensions and optionally lock the aspect ratio to ensure that their videos are resized correctly.

What makes this tool different is its ability to perform all processing locally in the browser, using Canvas for resolution scaling and MediaRecorder for output encoding, making it a free video resizer that does not require any uploads or third-party services. This approach ensures that user videos never leave their device, providing an additional layer of security and privacy. As a result, users can confidently use the tool to resize their videos without worrying about data breaches or unauthorized access.

Why Use Video Resizer?

  • Preset resolutions and custom dimensions supported
  • Maintain aspect ratio or freely stretch/squish
  • Reduce file size by lowering resolution
  • No uploads — processing stays on your device

Common Use Cases

File Size Reduction

Reduce video resolution to significantly decrease file size for sharing.

Platform Requirements

Resize videos to meet specific platform dimension requirements.

Thumbnail Creation

Scale videos to small dimensions for preview thumbnails.

Consistent Output

Standardize video resolutions across a collection of clips.

Technical Guide

The Video Resizer loads the video via an HTML5 Video element and creates a Canvas at the target dimensions. During processing, each video frame is drawn onto the canvas using drawImage() which handles the scaling. The canvas uses the browser's built-in image scaling algorithm for quality. For downscaling, the canvas produces smooth results; for upscaling, quality depends on the scaling factor. The canvas stream and audio (captured via Web Audio API) are combined and fed to MediaRecorder. Aspect ratio maintenance is calculated by fitting the video within the target dimensions while preserving proportions, optionally adding letterboxing. The tool supports both constrained (aspect ratio locked) and free (independent width/height) resizing modes.

Tips & Best Practices

  • 1
    Downscaling produces better results than upscaling
  • 2
    Lock aspect ratio to prevent video distortion
  • 3
    Lower resolutions significantly reduce file size
  • 4
    Use 720p for a good balance between quality and file size

Related Tools

Frequently Asked Questions

Q Does resizing reduce quality?
Downscaling may lose detail but looks clean. Upscaling can appear blurry. Re-encoding also introduces minor compression artifacts.
Q What resolutions are available?
Presets include 1080p, 720p, 480p, and 360p. Custom dimensions are also supported.
Q Is it private?
Yes. All processing runs in your browser — no files are uploaded.
Q Can I upscale a video?
Yes, but upscaling won't add detail — the video will simply be stretched to the larger size.
Q Does it preserve audio?
Yes, the audio track is preserved at its original quality.

About This Tool

Video Resizer is a free online tool by FreeToolkit.ai. All processing happens directly in your browser — your data never leaves your device. No registration or installation required.