Resize Video
Change video resolution up or down to fit any platform or device without re-shooting. Free, private, no signup — it all works in your browser.
Everything runs inside your browser — your file is never uploaded to a server.
First run downloads the media engine (~30 MB) once, then it stays cached.
About this tool
This tool changes the pixel dimensions of a video, scaling it down to a smaller resolution to shrink file size and speed up uploads, or scaling it up to fit a specific display or platform requirement. You can pick common presets like 1920x1080, 1280x720, or 640x360, or enter a custom width and height, and choose whether to preserve the original aspect ratio to avoid stretching or squashing the image. Processing runs entirely with FFmpeg compiled to WebAssembly inside your browser tab, so a 4K source file is scaled down locally without ever being sent to a server, keeping both your bandwidth and your privacy intact. This is especially useful before uploading to platforms with resolution or file size limits, when preparing lightweight video previews for a website, or when standardizing a batch of clips shot on different devices to a single consistent resolution before editing them together.
How to use this tool
1. Upload your video
Drag and drop the video file you want to resize.
2. Choose a resolution
Pick a preset size or enter a custom width and height.
3. Lock the aspect ratio
Keep proportions correct to avoid a stretched or squashed picture.
4. Download the resized video
Save the newly sized clip to your device.
Why use this tool
Different platforms, players and devices expect different resolutions, and shooting or exporting at the wrong size can lead to rejected uploads or unnecessarily large files. This tool resizes video instantly on your own device, with no software install and no size limit tied to a subscription plan, making it a practical everyday step before publishing, embedding, or archiving video content.
Tips & best practices
- Downscale long recordings to 720p before sharing them to save upload time and storage space.
- Always keep aspect ratio locked unless you specifically want a stretched or squashed effect.
- Match your target platform's recommended resolution to avoid automatic re-compression after upload.
Common use cases
- Shrinking a large 4K recording down to 1080p for easier sharing and storage.
- Standardizing multiple clips shot on different phones to one consistent resolution before editing.
- Preparing a lightweight, lower-resolution video preview for a website.
- Resizing a video to meet a platform's maximum resolution or file size requirement.
- Scaling footage to match the dimensions of another video before combining them.
Frequently asked questions
Will resizing a video down reduce its file size?
Yes, lowering the resolution significantly reduces file size since there are fewer pixels to encode per frame, which is one of the most effective ways to shrink a video.
Can I resize a video to a larger resolution than the original?
You can, but upscaling doesn't add real detail. It just stretches existing pixels, so the picture won't look sharper, only larger.
Does resizing distort the video's aspect ratio?
Only if you enter dimensions that don't match the original ratio. Keeping aspect ratio lock on ensures the picture isn't stretched or squashed.
What resolution should I choose for social media?
Common choices are 1080x1080 for square posts, 1080x1920 for vertical stories and reels, and 1920x1080 for standard landscape video.
Is resizing a video processed on a server?
No, all resizing happens locally in your browser using WebAssembly, so your video file is never uploaded anywhere.
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