Video resizer andaspect ratio converter
Scale to exact dimensions, or fit into a target frame with letterbox bars in whatever colour you want. Two different jobs, both done locally on files of any size.
How to use the video resizer in three steps
"Resize" covers two things people constantly confuse. Scaling changes the pixel dimensions and keeps the whole picture. Fitting keeps the whole picture too but pads it into a different shape with bars. Neither is the same as reframing, which throws away part of the image to fill a new shape — and for a talking head, reframing with face tracking is almost always what you actually wanted.
Scale to exact dimensions
Give a width and a height — or just one, and Shorz preserves the aspect ratio. Useful for hitting a platform's spec or shrinking a 4K master for upload.
Width, height, or both
Or fit into a new shape
Fit-to-aspect scales the video inside a target frame and pads the rest with letterbox or pillarbox bars — in any colour, so black bars aren't your only option.
Letterbox in any colour
Or reframe instead of padding
For talking-head footage, switch the project ratio and let face tracking crop into the new shape with the speaker centred. Full-bleed instead of bars.
9:16 · 1:1 · 16:9
Find it in the app under MCP single-file tool · in-project: aspect ratio switching.
Why Video Resizer in Shorz
Bars or no bars — you choose
Padding preserves the whole frame, which matters for gameplay, screen recordings and anything with text at the edges. Reframing fills the screen, which matters for faces. Shorz gives you both instead of picking for you.
Two ways to convert
One project, every platform's shape
16:9 for YouTube, 1:1 for square feeds, 9:16 for TikTok, Reels and Shorts are all native project ratios — so you export the shape you need rather than converting after the fact.
Native ratios
Who uses it, and for what
Platform specs
Hit an exact resolution requirement.
Gameplay to vertical
Pad, don't crop — keep the HUD.
Shrink a master
4K down to something uploadable.
Feed conversions
One edit, three shapes.
Shorz speaks MCP
Shorz isn't a locked web app. Connect it to Claude, Cursor, Codex or Gemini and your assistant can drive it directly — one message instead of a panel full of clicks. You review before anything is published.
See how MCP automation works
You say
“Fit this 16:9 gameplay clip into 1080×1920 with dark grey bars, then add captions.”
Shorz does
- 1Read the source dimensions
- 2Fit into 1080×1920 with the pad colour
- 3Caption the result
- 4Export the vertical file
Every tool ships with the same promises
They're not separate products with separate bills. One app, one credit balance, one export that belongs to you.
- No subscription — prepaid credits that never expire
- No watermark on anything you export, ever
- Full commercial rights on what you create
- A desktop app for Windows and Mac — your files stay on your machine
- Auto Edit and Clipping: 4 free videos a week, no card
- Drivable from Claude, Cursor, Codex or Gemini over MCP
Video Resizer questions
Resizing scales the video to new pixel dimensions. Fit-to-aspect scales it inside a target frame and pads the leftover space with letterbox or pillarbox bars in a colour you choose. Reframing — a third option — crops into the new shape instead, with face tracking keeping the subject centred.
Yes. Supply only a width or only a height and Shorz preserves the ratio for the other dimension.
No — you can set the pad colour to anything, which is handy when you want the bars to match a brand background rather than sit as black voids.
No. Resizing runs locally on your own machine, so there's no upload, no queue and no size limit.
Still have questions? Ask founder
More Shorz tools
Video Cropper
Crop to an exact rectangle, or reframe a whole video to vertical with face tracking.
Explore
Face Tracking
A centre crop puts your speaker's forehead at the edge of the frame.
Explore
Video Rotator
The phone recorded it sideways, or the front camera mirrored the text on your shirt.
Explore
Video Merger
Give Shorz a list of clips and it writes them into one file, in order, on your own disk.
Explore
Resize your video for any platform
Exact dimensions, letterbox bars in any colour you like, or a full-bleed face-tracked reframe. Runs locally on files of any size.
Publishes straight to