Video Resizer
Resize video frame dimensions and aspect ratios online directly in your browser. Scale video resolution to 1080p, 720p, 480p, or custom pixel dimensions while preserving aspect ratio and audio.
Perfect for resizing YouTube, Instagram, TikTok, and web presentation videos. Processes MP4, WebM, and MOV formats locally with HTML5 canvas and zero remote server file uploads.
Drag & drop your video here
or choose a file from your computer or phone
How to Resize Video Dimensions Online
Scale video frame dimensions and aspect ratios for social media, website embeds, and presentation decks directly in your browser.
Select Video File
Drag & drop an MP4, WebM, or MOV video into the upload zone. The file is decoded in browser memory with zero server uploads.
Pick Target Resolution
Select a standard resolution preset (1080p, 720p, 480p, 360p) or enter custom width and height with aspect ratio locked.
Resize in Browser
Click Resize Video. The browser renders video frames to the new resolution canvas with real-time encoding.
Download Resized Video
Review the output video player, check dimensions, and download your resized file immediately with no watermarks.
Video Resolutions & Aspect Ratios Explained
Technical principles for digital publishers, video creators, and developers.
Common Video Resolution Standards
Standard video resolutions are defined by pixel heights in a 16:9 widescreen frame:
- 1080p (1920 × 1080): Full HD standard for desktop web embeds and YouTube.
- 720p (1280 × 720): High definition, ideal for responsive web layouts with faster loading.
- 480p (854 × 480): Standard definition for bandwidth-constrained mobile devices.
- 360p (640 × 360): Compact format for thumbnail previews and low-latency streaming.
Why Aspect Ratio Lock Matters
Locking aspect ratio ensures that scaling one dimension automatically recalculates the other proportionally. Unlocking aspect ratio without intentional cropping stretches or squishes visual elements. MediaVexa locks aspect ratio by default while allowing manual overrides when specific custom dimensions are required.
Why Even Dimensions (Mod-2) Are Enforced
Digital video codecs (such as H.264/AVC, VP8, and VP9) use 4:2:0 chroma subsampling, dividing pixel matrices into 2x2 macroblocks. Odd pixel dimensions (e.g. 1281 × 719) cause codec initialization errors or green artifact lines along video edges. MediaVexa automatically adjusts custom resolutions to even integers for clean, universal compatibility.
Need to Reduce Video File Size Without Changing Dimensions?
If your resolution is already correct but you need a smaller file size for web uploads or email attachments, use our Video Compressor to optimize bitrate with zero server uploads.
Frequently Asked Questions
Answers to common questions about resizing video resolutions and maintaining aspect ratios.
More MediaVexa Utilities
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Scale image pixel dimensions while locking aspect ratio.
Convert between JPG, PNG, and modern WebP formats.
Reduce video file size with custom compression presets.