Video Resizer
Free online video resizer. Change any video to a new width and height — TikTok 1080×1920, YouTube 1920×1080, Instagram Square 1080×1080, custom pixel sizes, anything. Runs in your browser, no upload, no watermark. Faster than Clideo, Online-Convert, or Kapwing because nothing leaves your device.
Drop files here or click to browse
Max 10240.0 MB per file · drop multiple for batch
or press Ctrl+V to paste
100% private — files never leave your device
·Free — no sign up, no watermark
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How to Use Video Resizer
- Drop the video onto the video resizer (MP4, MOV, MKV, WebM all work; JPG / PNG images too)
- Pick a preset for common social-media sizes, or enter a custom width × height
- Hit the preview to confirm the resized result before processing
- Click Process and download the resized video — no watermark, no upload
Features
- Resize video to any custom width and height — full control down to the pixel
- One-click presets for TikTok / Reels (1080×1920), YouTube (1920×1080), Instagram Square (1080×1080), Instagram Portrait (1080×1350), 720p (1280×720)
- Live preview before processing — see exactly how the resized video will look
- Browser-native — your video resizer runs locally via FFmpeg WebAssembly, nothing uploads
- Output as MP4, MOV, MKV, or WebM — also resizes JPG / PNG / WebP images
- No upload, no watermark, no sign-up, no file size cap
Frequently Asked Questions
- How do I resize a video for TikTok, Reels, or Instagram?
- Upload your video, pick the matching preset — TikTok / Reels (1080×1920), Instagram Square (1080×1080), Instagram Portrait (1080×1350), YouTube (1920×1080) — and click Process. The video resizer outputs the right dimensions for each platform's auto-detected feed.
- How is this video resizer different from Clideo or Kapwing?
- Speed and privacy. Clideo / Kapwing upload your video to their servers, queue it, re-encode it, and send it back — slow on long clips and your file briefly sits on their disk. This video resizer runs FFmpeg WebAssembly directly in your browser, so nothing leaves your device. A 100 MB MP4 resizes in seconds rather than minutes.
- Does the video resizer maintain aspect ratio automatically?
- When you pick a preset, the dimensions are fixed — anything that doesn't match gets stretched. To keep aspect ratio, leave width and height proportional to the source. If you want a different aspect ratio without stretching, pair the video resizer with our crop tool first.
- Can I resize a video to a larger size (upscale)?
- Yes — you can resize up to any dimension. But naive upscaling just stretches pixels and won't add real detail; for true AI-enhanced upscaling, use our AI Upscale Video tool which reconstructs detail with our AI upscaler.
- Which formats does the video resizer support?
- Inputs: MP4, MOV, MKV, WebM, AVI, plus JPG / PNG / WebP for image resizing. Outputs: MP4 (H.264, default), MKV, MOV, WebM for video; PNG / JPG / WebP for images.
- Does the resizer preserve audio?
- Yes — the audio track passes through unchanged. Only the video stream is re-encoded to the new dimensions.
- Is there a file size limit on this video resizer?
- No hard cap below your plan limit. Free users can resize up to 10GB, which covers essentially any social-media-class video. Processing time depends on length and encoding quality.