One video, every platform
Drop a video, pick a target platform — Instagram, TikTok, YouTube, X — and download the perfectly-sized export.
How it works
1
Drop a video
MP4, MOV, MKV, WebM — anything ffmpeg can read.
2
Pick a platform
Instagram Feed, Reel, TikTok, YouTube, YouTube Short, X — each gets the right aspect ratio.
3
Download
Get an MP4 with the right dimensions, encoded for upload.
Why use Toolstack's Video Resizer for Social?
100% private
Your file never leaves your device — everything runs locally in your browser.
Instant
No upload, no queue. The result is ready as soon as your laptop finishes the math.
Free forever
No signup, no credit card, no daily limits for the core features.
Open standards
We use proven open-source libraries — no proprietary lock-in, no shady tracking.