Resize Video Online Free — No Upload

How to Resize Videos

Upload your video

Drag and drop a video file or click to select it. Supports MP4, WebM, MOV, AVI, and MKV formats.

Choose a resolution

Select a preset resolution (1080p, 720p, 480p, 360p) or enter a custom width and height.

Download the resized video

Click resize and download the result. The video is re-encoded to the new dimensions.

Why use FyleTools to resize videos?

100% Private

Your video never leaves your device. All resizing happens in your browser — no server uploads.

Free & Unlimited

No registration, no file limits, no watermarks. Resize as many videos as you need, completely free.

Common Presets

One-click presets for 1080p, 720p, 480p, and 360p, or enter any custom dimensions you need.

Frequently Asked Questions

Is my video uploaded to a server?

No. All resizing happens in your browser. Your video files never leave your device.

Will the aspect ratio be preserved?

You control the exact dimensions. The 16:9 presets maintain standard widescreen ratios. For custom sizes, enter matching dimensions to keep the original ratio.

Does resizing reduce video quality?

Downscaling to a lower resolution will reduce detail but results in smaller file sizes. For additional compression, use Video Compress after resizing.

What formats are supported?

MP4, WebM, MOV, AVI, and MKV as input. The output is always MP4. To change to a different format afterward, use Video Convert.

How fast is the resizing?

Resizing re-encodes the video, so time depends on file size and your device. Modern devices handle most videos in under a minute.

Does this work on my phone?

Yes. The tool runs entirely in your browser on any device, including smartphones and tablets.

Can I resize to a vertical or square format?

Yes. Enter any custom width and height, including square (e.g. 1080x1080) or vertical (e.g. 1080x1920) dimensions.

Is the audio preserved when resizing?

Yes. The audio track is copied without modification during the resize operation.

What interpolation method is used for resizing?

The tool uses bicubic interpolation, which provides smooth, high-quality results when scaling video frames up or down.

Can I resize a video without changing the aspect ratio?

Yes. Enable the 'maintain aspect ratio' option and the tool will automatically calculate the correct height for your specified width.

Will resizing affect the frame rate?

No. The original frame rate is preserved during resizing. Only the pixel dimensions change.

Can I resize to non-standard dimensions?

Yes. Enter any custom width and height. The tool supports any resolution from very small to 4K and beyond.

When to Use This Tool

Downscale a 4K video to 1080p for faster uploads and smaller file sizes on social media platforms.

Resize a video to 1080x1080 square format for Instagram feed posts.

Convert a landscape video to 1080x1920 vertical format for TikTok, Reels, or Stories.

Reduce video resolution to 480p or 360p for embedding on websites with bandwidth constraints.

Format	Description	Best For
MP4 (input/output)	H.264 video	Universal resized output
WebM (input)	VP8/VP9 web video	Web video source files
MOV (input)	Apple QuickTime video	iPhone recordings to resize
AVI (input)	Legacy video container	Older video files
MKV (input)	Matroska container	High-resolution source videos

Tips & Best Practices

Use 720p for a great balance of quality and file size — it looks sharp on most screens and is significantly smaller than 1080p.

For Instagram, resize to 1080x1080 (square), 1080x1350 (portrait), or 1920x1080 (landscape) depending on placement.

Always downscale rather than upscale — upscaling cannot add detail that was not in the original video.

Enable 'maintain aspect ratio' to prevent stretching when entering custom dimensions. For file size reduction, also compress the video after resizing.