How to resize video without cropping out your subject
August 19, 2026
Converting horizontal video to vertical or square almost always means either cropping the sides off or adding black bars — a plain center-crop keeps only the middle of the original frame, which cuts your subject out entirely if they weren't centered to begin with. The reliable fix: keep your subject centered when you shoot, or use letterboxing instead of cropping when they aren't. You can resize your video free here, entirely in your browser.
Why resizing crops out part of the frame
A 16:9 horizontal video and a 9:16 vertical video are different shapes — fitting one into the other without changing what's visible is geometrically impossible. Something has to give: either the sides get cropped away to fill the new shape completely, or the full original frame is kept and bars fill the leftover space. A standard center-crop resize takes the first approach, using the middle of your original frame as the new video — which is exactly why an off-center subject gets cut out.
Cropping vs. letterboxing: the real tradeoff
Cropping fills the entire new frame with no black bars, but permanently discards whatever was outside the crop area — content, not just empty space, is genuinely gone from the output.
Letterboxing (top/bottom bars) or pillarboxing (side bars) keeps your entire original frame intact, unmodified, just placed within the new aspect ratio with empty space filling the rest. Nothing is lost, but the video appears smaller within the frame, and viewers see black bars.
Neither is universally "better" — cropping looks more native to the platform (fills the whole vertical screen) but risks losing content; letterboxing guarantees nothing is cut but looks less polished. Which one to use depends on whether losing the edges of your frame actually matters for that specific video.
The most reliable fix: frame your shot centered
If you know footage is headed for a 9:16 or 1:1 resize, keep your subject centered in frame when you record. A center-crop resize preserves whatever's in the middle of the original frame, so a centered subject survives the crop intact regardless of how much gets trimmed off the sides. This is the cheapest, most reliable fix — it costs nothing and needs no special tooling, just framing awareness at shoot time.
What if the footage is already shot, off-center?
For existing footage where the subject isn't centered, a plain crop resize will cut them off, and there's no way around that without either re-shooting or using letterboxing instead, which guarantees the full frame (including your off-center subject) survives, just smaller and bordered.
AI reframing: the paid-tier answer to this problem
Some paid tools offer "auto-reframe" or AI-driven subject tracking — instead of one fixed crop for the whole clip, the crop frame moves shot by shot to follow wherever the subject actually is. It's a genuinely useful feature for footage with a moving or off-center subject, at the cost of being a more complex, typically paid capability rather than a simple crop.
Always preview before exporting
Whichever approach you use, preview the crop against your actual footage before committing to the export — a resize tool that shows a live preview of exactly what will and won't be visible in the new aspect ratio catches a cut-off subject before you've wasted a download and re-upload cycle finding out the hard way.
The bottom line
A center-crop resize keeps the middle of your frame — center your subject at shoot time and it survives resizing intact. Try WavyVid's resize tool free and preview the crop before you download.
Frequently asked questions
Why does resizing my video crop out part of the frame?
Changing aspect ratio (say, 16:9 horizontal to 9:16 vertical) without changing what's actually visible means either cropping the sides off or adding bars — a plain crop keeps only the center of the original frame, so anything off-center gets cut away.
What's the difference between cropping and letterboxing?
Cropping cuts away part of the original frame to fill the new aspect ratio completely — nothing is lost in size, but content outside the crop is gone. Letterboxing (or pillarboxing) keeps the entire original frame intact and adds black bars to fill the new shape instead — nothing is cut, but the video appears smaller within the new frame.
How do I keep my subject in frame when resizing to vertical?
The most reliable fix is to record with your subject already centered, since a center-crop resize keeps whatever's in the middle of the original frame. If you're resizing existing footage where the subject is off-center, letterboxing (no crop) is the safe fallback that guarantees nothing gets cut.
What is AI reframing / auto-reframe?
It's a feature (in some paid tools) that tracks a subject's position across the video and moves the crop frame to follow them, shot by shot, instead of using one fixed center-crop for the whole clip. It solves the off-center problem automatically, at the cost of being a more complex, often paid feature.
Is there a way to check before exporting whether my subject will get cut off?
Yes — always preview the crop against your source footage before committing to an export. A tool that shows a live preview of what will and won't be visible in the new aspect ratio saves you from finding out only after downloading.