Resize & Scale
Resize videos, add letterboxing, crop, and format for social media platforms. All processing happens locally in your browser.
About Resize & Scale
Presets
Quickly format your video for popular social media platforms. Automatically adds letterboxing/pillarboxing to maintain aspect ratio.
Resize
Scale your video to exact dimensions. Enable "maintain aspect ratio" to avoid stretching.
Letterbox
Fit video within a frame while preserving aspect ratio. Adds black bars (or custom color) to fill remaining space.
Crop
Extract a portion of the video. Specify exact dimensions and optional X/Y offset for positioning.
How to Resize a Video Online
Resizing a video for social media, a presentation, or a website takes just a few steps with VidStudio. Everything runs locally in your browser, so your files stay private and there is nothing to install.
- Upload your video. Drag and drop your file into the upload area, or click to browse. VidStudio accepts MP4, MOV, AVI, MKV, WebM, FLV, and most other common video formats.
- Choose a social media preset or enter custom dimensions. Pick from ready-made presets for YouTube, TikTok, Instagram, Twitter/X, or LinkedIn. Alternatively, switch to Resize, Letterbox, or Crop mode and type in any width and height you need.
- Download your resized video. Click "Process Video" and wait for the conversion to finish. Your resized MP4 is ready to download and upload anywhere.
Social Media Video Dimensions
Every platform has its own recommended video size. Using the wrong dimensions can lead to unexpected cropping, black bars, or reduced quality in the feed. Here are the most common specs you should know.
YouTube
1920 x 1080 (16:9)
The standard landscape format for YouTube videos. Also supports 2560x1440 and 3840x2160 for higher resolutions.
YouTube Shorts
1080 x 1920 (9:16)
Vertical video format for YouTube's short-form content. Keep your video under 60 seconds for Shorts.
TikTok
1080 x 1920 (9:16)
Full-screen vertical format. TikTok recommends 9:16 for the best viewing experience on mobile devices.
Instagram Feed
1080 x 1080 (1:1) or 1080 x 1350 (4:5)
Square works well for carousel posts. Portrait (4:5) takes up more screen space in the feed, increasing engagement.
Instagram Stories / Reels
1080 x 1920 (9:16)
Full-screen vertical video. Leave safe zones at the top and bottom for UI overlays and captions.
Twitter / X
1920 x 1080 (16:9)
Landscape video is the default. Twitter also supports 1:1 and 9:16, but 16:9 gets the most real estate in the timeline.
1920 x 1080 (16:9)
Professional landscape format. LinkedIn supports videos up to 10 minutes for native uploads.
Resize, Letterbox, or Crop: What's the Difference?
Resize
Scales the entire video frame to new dimensions. If the target aspect ratio differs from the original and "Maintain aspect ratio" is enabled, the video is scaled to fit within the target size. If disabled, the video is stretched to fill the exact dimensions, which may distort the image.
Letterbox
Places your video inside a target frame while preserving the original aspect ratio. Padding bars (black by default, or any color you choose) fill the remaining space. This is the safest option when you need to match exact platform dimensions without losing any part of the video.
Crop
Cuts away the edges of the video to fit the target dimensions. No scaling is applied to the remaining content, so quality is preserved, but parts of the frame are removed. Use the X/Y offset controls to choose which region of the video to keep.
100% Private: Your Video Never Leaves Your Device
VidStudio processes every video directly in your browser using FFmpeg compiled to WebAssembly. Your files are never uploaded to a server, never stored in the cloud, and never seen by anyone but you. There are no file-size limits imposed by a server, no waiting in a processing queue, and no risk of your footage being accessed by third parties. Once you close the tab, all temporary data is gone. This makes VidStudio ideal for resizing sensitive, confidential, or personal video content.
Supported Formats
VidStudio supports a wide range of video formats for both input and output. You can upload files in MP4, MOV, AVI, MKV, WebM, FLV, and many other container formats recognized by FFmpeg. All processed videos are exported as MP4 with H.264 video encoding, which provides excellent compatibility across every major platform, browser, and device. H.264 is the most widely supported codec on the web, ensuring your resized videos play smoothly on YouTube, Instagram, TikTok, Twitter/X, LinkedIn, and any other destination.
Frequently Asked Questions
Will resizing reduce my video quality?
Resizing to a smaller resolution naturally reduces detail, but VidStudio re-encodes with high-quality settings to minimize visible artifacts. Scaling up beyond the original resolution may produce a softer image because new pixels must be interpolated. For the best results, always start with the highest-quality source you have and resize downward.
What's the difference between resizing and cropping?
Resizing scales the entire frame to new dimensions, while cropping removes pixels from the edges to match the target size. Resizing keeps the full image but changes its scale; cropping keeps the original scale but shows a smaller portion of the image.
How do I resize a video for Instagram?
Use the Presets tab and select the Instagram Square (1080x1080) option for feed posts, or use the TikTok/Reels preset (1080x1920) for Stories and Reels. For the 4:5 portrait format (1080x1350), switch to Letterbox or Resize mode and enter the dimensions manually.
What video formats are supported?
VidStudio accepts MP4, MOV, AVI, MKV, WebM, FLV, and most other common video formats as input. All output files are exported as MP4 with H.264 encoding, which works on virtually every platform and device.
Can I change the aspect ratio without stretching?
Yes. Use the Letterbox mode to add padding bars and preserve the original aspect ratio, or use Crop mode to trim the edges and fill the new frame. Both approaches keep your footage looking natural without any distortion.
Do I need to create an account?
No. VidStudio is completely free and requires no account or registration. Your videos are processed in your browser, so there is nothing to sign up for.
Related Tools & Resources
More Video Tools
Compress Video. Reduce file size without losing quality.
Trim & Cut Video. Remove unwanted sections from your clips.
Generate Thumbnails. Extract still frames for previews and cover images.
From the Blog
How to Resize Video for Social Media. Platform-by-platform guide with recommended settings.
Understanding Aspect Ratios. Learn why 16:9, 9:16, 4:5, and 1:1 matter.
Letterboxing vs. Cropping. When to pad and when to cut.