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.
Drag to compare
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 — processes in real time
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.
AI 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 true quality upscaling, use the Video Upscaler (AI) 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 AI-quality upscaling, use the dedicated Video Upscaler.
Does it upload my video?
No. All processing happens locally in your browser. Your video never leaves your device.
Why it's different
Video resolution scaling with exact letterbox/pillarbox — named presets produce precise dimensions, no upload, browser-only. Your video never leaves your device.
100% Private
Everything runs on your device using in-browser AI. Nothing is transmitted to any server — not the file, not metadata, not filenames.
True Alpha Channel
We export straight (non-premultiplied) alpha so transparent PNGs open with a real checkerboard in Photoshop and Figma — no black halos.
Free Forever
No paywall, no watermark, no premium tier. The full-quality AI is free, supported by non-intrusive ads.
Works Offline
Once loaded, the app and AI models cache locally. Process files without an internet connection. Installable as a desktop or mobile app.
Ready to try it?
Free, private, no signup. 4K, 1080p, 720p, or custom.
Resize a video →