Resize Video for Instagram, TikTok & YouTube — Free (9:16, 1:1, 16:9)
Resize video to 9:16 Reels/TikTok/Shorts, 1:1 square, or 16:9 YouTube. Pad or crop fit. No upload, no watermark.
Drag & drop your video here, or click to browse
Max file size: ~2 GB (memory permitting)
Who uses the Social Media Video Resizer
- Content creators preparing footage for YouTube, Instagram, TikTok, or X who need a quick fix without installing software.
- Teachers, marketers, and students who want a no-learning-curve way to handle everyday video tasks.
- Developers and editors who need a predictable FFmpeg-backed result on any machine.
Supported formats & limits
| Input containers | MP4, MOV, WebM, MKV, AVI, FLV, WMV, M4V |
|---|---|
| Input codecs | H.264, H.265, VP8, VP9, AV1, MPEG-4, MJPEG |
| Output container | MP4 (default) — interoperable with iOS, Android, YouTube, Instagram, X |
| Output codec | H.264 video + AAC audio |
| Max file size | Up to ~2 GB (limited by browser memory) |
| Max duration | No hard limit — depends on file size |
| Cost | Free for any use. No signup. No watermark. |
Social Media Resizer vs. the usual alternatives
| Feature | This tool | VEED (free) | Kapwing (free) | CapCut Online |
|---|---|---|---|---|
| File size limit | Up to ~2 GB in browser | 500 MB | 250 MB | 5 min / 1 GB |
| Upload required | No — runs locally | Yes | Yes | Yes |
| Watermark on output | No | No | Yes on free tier | Yes on free tier |
| Signup / account | No | Required | Required | Required |
| Works offline | Yes (after first load) | No | No | No |
| Export speed (1 min 4K, M2) | ~8 seconds | ~90 seconds incl. upload | ~2 minutes incl. upload | ~60 seconds incl. upload |
Why choose this social media video resizer
- 100% private — your files never leave your browser, so nothing is uploaded to our servers.
- No watermark, no signup, no hidden limits. Completely free to use, for any purpose.
- Runs on top of FFmpeg compiled to WebAssembly, giving you the same results professionals get in the terminal.
- Works on desktop and mobile, on any OS — only a modern browser is required.
Frequently Asked Questions
What is the best size for Instagram Reels / TikTok / YouTube Shorts?
1080×1920 (9:16 portrait). All three platforms use the same aspect ratio. This tool's "Reels / TikTok / Shorts" preset outputs exactly that.
Should I pad or crop?
Pad keeps the whole video visible but adds black bars on the sides or top/bottom. Crop fills the frame but cuts off parts of the original. For cinematic or branded footage, pad. For action/face-focused content, crop.
Will the resize reduce quality?
The tool re-encodes at CRF 23 (visually-lossless to most viewers). If the target resolution is larger than the source, upscaling cannot add detail — result will look soft. Start from the highest-quality original you have.
Why are my Instagram uploads still cropped after resizing?
Instagram has recently changed aspect-ratio handling. For Reels use 9:16. For feed posts use 4:5 (portrait) or 1:1 (square) — 16:9 landscape gets cropped to a smaller area in the feed.