Exact frame size
The output reports its real width and height for platform checks.
Free Tool
Video Resizer
Scale your video to any resolution — from 4K to 240p, or a custom size. Maintains aspect ratio by default. Entirely in-browser: no upload, no server, your video stays private.
Watch the workflow
Scale video to any resolution — 4K, 1080p, 720p, or custom dimensions in your browser
Target resolution
Drop a video file or click to upload
MP4 · WebM · MOV — processed in your browser, files never leave your device
When to downscale
Web delivery — downscale 4K recordings to 1080p for faster loading without visible quality loss at typical viewing sizes.
Social media — Instagram Reels, TikTok, and Twitter have resolution limits. Downscale to 1080×1920 (vertical) or 1920×1080 (horizontal).
Email attachments — reduce to 480p or 360p so the file fits within email attachment limits.
Upscaling — downscale before sending to the Video Upscaler so the upscale has more room to improve.
Frequently asked questions
Does resizing affect video quality?
Downscaling reduces resolution but looks good at smaller sizes. Upscaling to a higher resolution than the source adds pixels via interpolation — for dedicated resolution upscaling, use the Video Upscaler tool.
Does "maintain aspect ratio" work with custom dimensions?
Yes. Enter one dimension and leave the other blank — the tool calculates the correct value. Alternatively, enter both and uncheck the aspect ratio option to stretch to exact dimensions.
What format is the output?
Output is WebM (VP9). To convert to MP4 for social media upload, use the Video Format Converter after resizing.
Can I upscale a video?
Yes — enter a larger target resolution. Note that the browser codec interpolates the new pixels geometrically. For dedicated resolution upscaling, use the Video Upscaler.
Does it upload my video?
No. All processing happens locally in your browser. Your video never leaves your device.
Resolution delivery
Scale frames to a named target with dimensions you can verify
Choose 4K, 1080p, 720p, 480p, or custom dimensions while preserving the source relationship unless you deliberately change it.
4K → 480p
Preset range
Aspect discipline
Locked scaling prevents faces and circles from stretching.
Playable result
Preview the resized clip and carry it directly into the Video Editor.
Know before you process: Reducing resolution does not guarantee a target file size; bitrate and duration also control delivery weight.
Ready to try it?
Free, private, no signup. 4K, 1080p, 720p, or custom.
Resize a video →