Resize Video Online Free – Change Video Resolution to Any Size
Change your video to 4K, 1080p, 720p, 480p, or any custom pixel size directly in your browser. Pick a fit mode to control how the image fills the new frame. No uploads, no software, no cost.
Resize Video Dimensions
What Resizing Actually Does
Resizing changes the pixel dimensions of your video. Downscaling (4K to 1080p) shrinks the image and usually improves perceived quality. Upscaling (480p to 1080p) makes it larger but doesn't add real detail — it just spreads existing pixels across a bigger canvas.
The tool recalculates every frame to match your target dimensions. If aspect ratios don't match, the fit mode determines what happens: contain adds black bars, cover crops the edges, or fill stretches the image (which distorts it).
This runs entirely in your browser. No upload means faster processing and complete privacy. Processing time depends on video length and your computer's speed.
When You Need This
Meeting platform upload limits
Some platforms cap uploads at 720p or 1080p. If you shot in 4K, downscaling ensures your file gets accepted. Smaller resolution also means faster upload and smaller file size.
Matching clips from different cameras
One camera shot 4K, another shot 1080p. Editing them together causes issues. Resize everything to 1080p before importing to your editor for a smooth timeline.
Landscape to vertical for Reels or TikTok
Set width to 1080 and height to 1920, then use Cover mode. The tool crops the sides to fill the vertical frame. You lose the edges but get a full-screen mobile video.
Reducing file size for email
Email attachments usually cap at 10-25MB. Resizing 1080p to 480p cuts the pixel count by 75%, often enough to fit under the limit. Quality drops but it's shareable.
Custom banner or display sizes
Digital signage or web banners need specific dimensions. Turn off aspect ratio lock and type exact values. Use Fill mode to stretch the video to fit — just know it will distort.
Common Video Resolutions
| Name | Resolution | Use Case |
|---|---|---|
| 4K (UHD) | 3840 x 2160 | High-end production, future-proofing |
| 1080p (Full HD) | 1920 x 1080 | Standard web video, YouTube |
| 720p (HD) | 1280 x 720 | Faster uploads, smaller screens |
| 480p (SD) | 854 x 480 | Email attachments, low bandwidth |
| Vertical (9:16) | 1080 x 1920 | TikTok, Reels, Shorts |
| Square (1:1) | 1080 x 1080 | Instagram feed posts |
How to Resize Your Video
Upload your video
Select or drag your file. It stays local — no server upload. The tool shows your original resolution so you know what you're working with.
Set target dimensions
Click a preset like 1080p or 720p, or type custom width and height. Keep aspect ratio locked to avoid distortion — unless you specifically need to stretch the image.
Resize and download
Click resize and wait. Processing time depends on video length and resolution. Keep the tab open. When done, preview and download the resized file.
Use Cases
Meeting platform resolution limits
Some community forums and older video platforms cap uploads at 720p or 1080p. If you filmed in 4K, select the matching preset to scale the clip down to the required ceiling before you upload. The encoder remaps every frame to the smaller grid and produces a file that passes the platform check.
Standardizing clips from multiple cameras
When you receive footage from different phones and cameras for a project, each clip often has a different resolution. Type 1920x1080 into the custom fields and process each clip individually. Every file comes out at the same pixel size, which prevents resolution mismatch errors when you bring them into a video editor.
Reformatting landscape video to vertical
YouTube videos filmed in 16:9 do not fit Instagram Reels or TikTok without reformatting. Set the width to 1080 and the height to 1920, then select Cover mode. The encoder zooms the video until it fills the vertical frame and trims the left and right edges, producing a full-screen vertical clip.
Reducing file size for email delivery
Email attachments typically have a size cap between 10MB and 25MB. A one-minute 1080p recording can exceed 100MB. Resizing it to 480p cuts the pixel count by more than 75%, which reduces file size enough for most email clients to accept the attachment without a cloud link workaround.
Creating narrow banner video for websites
Hero banners on landing pages often use a custom aspect ratio like 1920x400. Turn off the aspect ratio lock and type your banner dimensions into the width and height fields. The Fill mode stretches the video to match both dimensions so it covers the banner area without black bars on any side.
Settings Explained
Width and Height Fields
These two fields define the exact output pixel dimensions. Standard HD video is 1920 pixels wide by 1080 pixels tall. Standard 4K is 3840 by 2160. You can also type any custom number here, such as 1080x1080 for a square post or 1080x1920 for a vertical reel. The preset buttons fill these fields automatically for common sizes.
Maintain Aspect Ratio
When this toggle is on, changing the width recalculates the height to preserve the original proportions, and vice versa. This prevents the video from looking squashed or stretched. Turn it off when you intentionally want to force a specific aspect ratio that does not match the source, such as converting a 16:9 clip to square format.
Fit Mode
Contain scales the video down so the entire image fits inside your target dimensions. Gaps appear as black bars. Cover scales the video up until it fills the frame completely, trimming any content that extends outside the boundary. Fill ignores the original ratio and forces the image to exactly match both your width and height values, which stretches the content.
Frequently Asked Questions
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