Upload the video
Import the video whose aspect ratio needs adjusting, or queue multiple clips together in a batch task.
AIMIX DESKTOP VIDEO EDITOR
Video Crop: Remove Black Bars, Change Aspect Ratios, and Fit One Master to Every Platform
Remove black bars and switch aspect ratios in one click, with AI subject tracking that keeps faces in frame when converting between landscape and portrait. Batch processing is supported, so one piece of content fits Douyin, WeChat Channels, YouTube, and more.
Download AIMIXHow it works
Post landscape footage to Douyin and the screen fills with black bars; upload a portrait video to YouTube and only a narrow strip survives — aspect ratio is the first hurdle of multi-platform distribution. Video Crop handles black-bar removal, free ratio switching, and AI subject tracking for smart reframing, so one video works everywhere.
Choose a cropping method
Black-bar removal auto-detects and trims the top and bottom bars; ratio switching offers 9:16, 1:1, 16:9, and more; AI tracking keeps the subject centered so landscape-to-portrait never cuts off faces.
Preview and export
Preview the framing, then export — output several ratio versions at once so one piece of content covers every platform.
Real-world examples
The five scripts below are actual outputs of AIMIX AI script creation, generated from the prompt shown in each example. They were generated in Chinese; the tables are translated without edits, durations are as generated. A scene without a generated visual description is marked “—”.
Multi-platform distribution for landscape content: export three ratios in one pass
Best for: talking-head knowledge videos, courses, interviews · source footage in 16:9 landscape
结构Flow: landscape master → crop 9:16 / 1:1 / 16:9 versions → publish per platform
- Landscape to portrait without cutting faces
- One master, three versions, full coverage
- Batch-process entire columns of footage
Multi-platform operation does not mean re-editing three times — it means cropping three times. AI tracking keeps the face centered in every landscape-to-portrait conversion, so the same content lands perfectly on each platform.
Three high-frequency cropping scenarios
Each one maps to a different distribution need:
Black-bar removal
Auto-detects the active picture area and trims the top and bottom bars — a lifesaver for old footage and screen recordings.
Aspect ratio switching
Switch between 9:16, 1:1, 16:9, 4:3, and more, with precise output to each platform spec.
AI smart tracking
Subject recognition plus dynamic framing keeps people inside the safe area of the frame when flipping between orientations.
For multi-platform distribution, export multiple ratio versions in one go and skip the repeated exports.
Keep control of the final edit
AI tracking keeps subjects intact
Landscape-to-portrait framing is judged by AI segment by segment, and the frame follows the subject as people move.
One master, many versions
Output the same video in multiple ratios at once and solve every platform spec in a single pass.
Batch aspect conversion
Convert an entire batch of footage to one target ratio — ideal for serialized, matrix-style production cadence.
Frequently asked questions
Does cropping distort the picture?
No. Cropping trims an area of the frame at the same ratio without stretching the footage; pair it with background blur or similar effects when needed.
How does AI smart tracking work?
AI identifies the main subject in the frame (such as a face) segment by segment and dynamically adjusts the crop box, so the subject stays at the center of the composition after the ratio change.
Which aspect ratios are supported?
Common ratios including 9:16, 1:1, 16:9, and 4:3, plus custom crop regions.
Can it process videos in bulk?
Yes. Set one target ratio for multiple videos and export them all in a single run.
Does cropping reduce image quality?
Cropping only changes the visible area of the frame; resolution follows your export settings. Fewer effective pixels when cutting a portrait clip from landscape footage is normal.
Does Video Crop consume credits?
Billing is per task as shown in the in-app prompt; batch tasks display an estimated cost before running.