Create a delivery copy
Export a practical resolution for a website, presentation, support ticket or content library while retaining the source master.
1. Select video
Drop a video here
or click to choose a file
Supported formats: MP4, WebM, MOV, MKV
Maximum file size: 2 GB
2. Resize mode
3. Resolution
4. Fit mode
5. Keep source aspect ratio
Resize preview
Resize preview
Preview shows composition and fit. Final sharpness and file size are known only after full encoding.
Source: -
Output canvas: -
Keep source aspect ratio: Original
Fit mode: Contain
Result
Your video is ready.
- Original size
- -
- Output size
- -
- Size change
- -
- Resolution
- -
- Duration
- -
- Container
- MP4
Files selected from your device stay in this browser while they are processed.
How should a video fit a new size?
Use Contain to keep the whole picture with possible empty space, Cover to fill the canvas while cropping the edges, or Stretch only when distortion is acceptable. Keep the aspect ratio for most content and avoid upscaling beyond the detail available in the source.
Resize controls pixels; fit mode controls composition
First choose the target canvas dimensions. Then decide how the source should occupy that canvas: Contain preserves the whole frame, Cover fills it by cropping edges, and Stretch changes the source proportions. These decisions affect appearance independently from codec and bitrate.
When to resize a video
Standardize mixed clips
Bring footage from several devices into one canvas size before merging, presenting or archiving it.
Downscale high-resolution footage
Reduce processing load and output pixels when the original resolution is higher than the viewing context needs.
Place portrait media on a landscape canvas
Use Contain to retain the entire portrait frame, or Cover when filling the landscape canvas matters more than keeping every edge.
How to resize a video
Add the video
Choose a local video or a direct URL that the browser can access, then confirm the source resolution and aspect ratio.
Choose preset, custom or percentage
Use a preset for common frame sizes, exact pixels for a required canvas, or percentage mode for proportional scaling from the source.
Select a fit mode
Pick Contain to keep everything, Cover to fill the canvas without distortion, or Stretch only when changing proportions is intentional.
Review the preview and warnings
Confirm that important content is not cropped, bars are acceptable, and any upscaling or stretching warning matches your intent.
Encode and inspect the result
Process the video with a supported format, then check text, faces, circles, fine lines, audio sync and file size before delivery.
Choose dimensions and fit mode deliberately
Contain preserves; Cover crops; Stretch distorts
These modes solve different layout problems. Do not label one as universally best. Choose based on whether preserving the full source, filling the canvas or matching exact dimensions matters most.
Resolution is not the same as quality
Pixel dimensions describe frame size. Perceived quality also depends on source detail, codec, bitrate, motion, frame rate and repeated encoding. A larger output cannot recover detail that the source never contained.
Downscaling often needs less data
A smaller frame can usually be encoded with a lower bitrate for similar viewing conditions, but final size still depends on duration, audio and encoder choices. Use the compressor when a precise size target matters.
Aspect ratio determines geometry
When source and output ratios differ, the tool must add empty space, crop edges or distort the image. There is no fourth option that preserves every pixel, fills the frame and avoids distortion at the same time.
Check current destination requirements
Publishing platforms and business systems can change accepted resolutions, aspect ratios, codecs and file limits. Treat presets as convenient starting points, not permanent platform specifications.
How resizing is processed
When the existing implementation is client-side, local files are decoded, scaled and encoded in the current browser. Remote URL mode still downloads data from the source host and is governed by network access, CORS and authorization. State these paths separately.
Video resizing limitations
- Upscaling increases pixel dimensions but cannot invent authentic source detail.
- Very large output frames can exceed browser memory or the encoder's maximum dimensions.
- Contain may require a background; Cover removes edges; Stretch changes geometry.
- Output format and codec availability varies by browser and operating system.
Video resizing FAQ
What is the best resize mode?
Use a preset for a common frame size, Custom Size for exact pixel requirements, and Percentage when you want a proportional scale from the source. The best choice depends on the destination, not on a universal ranking.
What is the difference between Contain and Cover?
Contain keeps the entire source frame and may add empty space. Cover fills the output frame without distortion but crops source edges when the aspect ratios differ.
When should I use Stretch?
Use it only when exact dimensions matter more than preserving the source geometry, or when the source already has the same aspect ratio. Check faces, circles, logos and text for distortion.
Will resizing make the video sharper?
Downscaling can make some artifacts less noticeable at a smaller display size. Upscaling increases dimensions but cannot recreate authentic missing detail; it can make softness more obvious.
Does resizing reduce file size?
Downscaling often allows a lower bitrate and can reduce size, but the final file also depends on duration, codec, frame rate, audio and quality settings. Use Video Compressor for a target-size workflow.
Why are there bars around the video?
Contain preserves the entire source when its aspect ratio differs from the output canvas, so unused canvas remains. Use a suitable background, switch to Cover, or choose matching dimensions depending on whether cropping is acceptable.
Why did Cover cut off part of the picture?
Cover scales the source until the entire output canvas is filled. When aspect ratios differ, the overflowing edges must be cropped. Use Contain or crop the source manually when placement matters.
Can I resize a video from a URL?
Yes only when the URL is a public, direct media file and the source allows browser access. CORS, authentication, expiry and byte-range behavior can block loading or processing.
Why can the browser not export a very large size?
Large frames require more memory for decoded and intermediate images, and encoders have maximum dimensions. Choose a smaller output, shorter source or lower frame rate and close other heavy tabs.
Is the source file overwritten?
No. Resizing produces a separate output file. Keep the original until you have reviewed the new dimensions, fit and quality.
Related video tools
Crop VideoChoose exactly which part of the picture should remain before resizing.Video CompressorTarget a smaller file after choosing the right output resolution.Merge VideoCombine clips after bringing them to a consistent canvas size.Video ConverterChange the container or codec when compatibility is more important than dimensions.