Choose a file to convert. It's processed locally — never uploaded. Tip: add several files to convert them all at once.
Settings
Result appears here after you select
{ } How to use
- Choose the video.
- Pick the platform you are posting to.
- Choose what fills the space around the picture, then select Process.
{ } How it works
Video Social Media Resizer works on the file you upload. Adjust the options, then select Process ▸ and it runs entirely in your browser — nothing is uploaded to a server — then shows the result in the Output panel.
Inputs
- Video file — upload a file (video/*); it is read locally in your browser
- Platform — choose one — TikTok / Reels / Shorts (9:16), Instagram feed (1:1), Instagram portrait (4:5), YouTube (16:9), X / Twitter (16:9) (default: TikTok / Reels / Shorts (9:16))
- Fill the spare space with — choose one — A blurred copy of the video, Black bars (default: A blurred copy of the video)
Output
A downloadable MP4 file — use the Download button in the Output panel.
{ } Common uses
- Turn a landscape video into a vertical one for TikTok, Reels or Shorts.
- Make a square version of a clip for an Instagram feed post.
- Fit a phone recording into a 16:9 frame for YouTube.
{ } Limitations
- The picture is fitted inside the frame and never cropped, so a landscape clip made vertical will have filled space above and below. That is deliberate — cropping would quietly cut the sides off your video.
- The blurred background is generated from the video itself, which costs a little more time than plain black bars.
{ } FAQ
Is my data uploaded to a server?
No. Everything runs locally in your browser — your files never leave your device.
Can I process more than one file at once?
Yes — add several files and they’re all processed and downloaded together as a ZIP.
Is this tool free?
Yes — it’s completely free and needs no sign-up.
Why not crop to fill the frame instead?
Because cropping throws away part of the picture, and you cannot tell from the settings how much. A landscape clip cropped to 9:16 loses roughly two thirds of its width, usually including whatever was at the edges. Padding keeps everything and makes the trade-off visible.
Blurred background or black bars?
Blur almost always looks better on a phone, because black bars read as a mistake while a blurred fill reads as intentional. Choose black when the video will be shown on a dark background anyway, or when you want the smallest possible file.