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Video Cropper is a simple, no-install utility that helps you crop an uploaded video to a specific aspect ratio and immediately download the result as an MP4 file. You select an aspect ratio preset (for example 16:9, 9:16, or 1:1), then the backend computes a centered crop rectangle from the input video’s dimensions and processes the full video using FFmpeg’s crop filter. The tool supports both manual cropping via an AI-suggested crop box and automatic center-cropping when no crop box is provided. An optional AI Assistant can generate a safer crop rectangle from a preview frame, but it only suggests values—your video is cropped only when you click the main “Crop video” button. A built-in Sample Input button loads a short MP4 so you can test the workflow right away. Output video is re-encoded to H.264 (MP4) for reliable playback across devices and platforms.
Note: AI can make mistakes, so please double-check it.
Crop settings
Choose an aspect ratio. AI can refine the crop box.
Extracts a preview frame and suggests a safer crop box for your selected aspect ratio. You still click “Crop video” to generate the output.
Common questions about this tool
Upload your video, select the 9:16 aspect ratio preset, and click Crop video. The backend computes a centered crop rectangle from the original frame dimensions, then re-encodes the output as an MP4 so you get consistent playback.
When you click “Suggest crop with AI”, the tool extracts a preview frame and sends it to a secure backend AI endpoint along with your selected aspect ratio. The AI returns suggested crop rectangle coordinates and warnings, but it does not crop your video automatically until you click Crop video.
Yes. Video Cropper performs cropping with FFmpeg and outputs a re-encoded MP4 (H.264) file for reliable compatibility across common players and devices.
If your input video contains an audio stream, the backend keeps audio and encodes it into AAC during the MP4 export. If the input has no audio, the output will be video-only.
The AI suggestion is generated from a single preview frame, and the same crop rectangle is applied across the entire video. If important content moves outside that rectangle over time, you may need to try a different aspect ratio or create a safer crop rectangle.
Upload your video, pick an aspect ratio preset (like 16:9 or 9:16), and click Crop video. The backend computes a centered crop rectangle from the input dimensions and re-encodes the output as MP4 for consistent playback.
Yes. Click “Suggest crop with AI” to extract a preview frame and request crop suggestions from a secure backend AI endpoint. The AI only suggests a crop box and warnings; you still click Crop video to generate the final output.
If your input video includes an audio stream, the backend keeps audio and encodes it into AAC while exporting the cropped MP4. If there is no audio stream, the output will be video-only.
The crop rectangle is applied as a single fixed rectangle for the entire video run. The AI crop suggestion is generated from one preview frame, and the same coordinates are used for all frames.
The tool always exports the result as an H.264 MP4 file. Suggested filenames include the crop output dimensions (for example, a width×height indicator) so you can distinguish different runs.
Verified content & sources
This tool's content and its supporting explanations have been created and reviewed by subject-matter experts. Calculations and logic are based on established research sources.
Scope: interactive tool, explanatory content, and related articles.
ToolGrid — Product & Engineering
Leads product strategy, technical architecture, and implementation of the core platform that powers ToolGrid calculators.
ToolGrid — Research & Content
Conducts research, designs calculation methodologies, and produces explanatory content to ensure accurate, practical, and trustworthy tool outputs.
Based on 2 research sources:
Learn what this tool does, when to use it, and how it fits into your workflow.
Video Cropper is an online video cropper designed for one clear job: remove unwanted parts of a video by cropping it to a specific aspect ratio, then download the result as an MP4 file. It is built for everyday tasks like preparing short clips, resizing media for different viewing formats, or removing distracting edges from a recording.
The core idea behind aspect ratio cropping is straightforward: you select a target ratio (for example 16:9 for landscape, 9:16 for portrait, or 1:1 for squares). The tool then calculates a crop rectangle based on the original video dimensions and exports a new video that contains only the chosen region. This matches the way many simple web-based video crop tools work, where the user chooses the desired output framing and the system handles the pixel math reliably in the background.
Video Cropper takes an uploaded video file, computes a valid crop rectangle, and processes the full video using FFmpeg’s crop filter. It re-encodes the output as H.264 MP4 so the result is easy to play, share, and re-use in downstream workflows. If you enable the optional AI Assistant, the tool can suggest a safer crop rectangle based on a preview frame, but it will still only apply the crop after you click the main “Crop video” action.
You typically want an online crop video to aspect ratio conversion when you have a recording that does not match the target viewing format. Common scenarios include:
If you also need to change the format after cropping, you can pair this workflow with other file conversion tools in the same cluster.
Aspect ratio cropping aims to preserve the chosen framing while removing the rest. The tool computes a centered crop rectangle such that the resulting width and height match the requested ratio as closely as possible. For example, when cropping a wide video to a taller portrait ratio, it removes extra vertical area by cropping the height. When cropping a tall video to a wide landscape ratio, it removes extra horizontal area by cropping the width.
This approach is reliable because the math is based on the detected input dimensions, and the crop rectangle is validated before FFmpeg runs. The output is then re-encoded to MP4 to keep playback consistent across devices.
The UI is intentionally minimal so you can get results with few clicks:
Video Cropper offers an AI Assistant option. When you click “Suggest crop with AI”, the tool extracts a preview frame from your video and sends it to a secure backend AI endpoint with your selected target aspect ratio. The AI returns suggestions (including crop rectangle coordinates and warnings). The UI uses the best suggestion as your crop box, then you still click “Crop video” to generate the cropped MP4.
Cropping changes the video stream but does not remove your audio. If your input video has an audio stream, the backend keeps audio and encodes it into AAC during the MP4 export. If there is no audio stream, the output becomes video-only. In both cases the final output is an H.264 MP4 file for broad compatibility.
After cropping, many users continue with other format steps. For example, if you want an animated preview instead of a full MP4, use Video to GIF. If you also need audio optimization or format adjustments for the workflow, you can pair this with AAC Converter and AAC Compressor. For selecting a specific sound segment from an audio track, the Audio Cutter can help you create short clips. If your pipeline needs uncompressed audio for editing or analysis, convert using MP3 to WAV.
Here are practical notes that help when your expected crop does not match what you see:
Keywords: online video cropper, crop video to aspect ratio, crop video to 9:16, crop video to 16:9, portrait video cropping, landscape video cropping, square video cropping, crop video to MP4, and FFmpeg crop rectangle export. It also supports intent phrases like crop video online free and aspect ratio video converter.
Video Cropper is a simple utility, not a full editor. It applies one fixed crop rectangle for the entire video run and does not offer frame-by-frame tracking crops or complex overlays.
The workflow is reliable because the backend reads video dimensions, validates aspect ratio math, applies FFmpeg crop filters, re-encodes to H.264 MP4, and returns a direct download.
We’ll add articles and guides here soon. Check back for tips and best practices.
Summary: Video Cropper is a simple, no-install utility that helps you crop an uploaded video to a specific aspect ratio and immediately download the result as an MP4 file. You select an aspect ratio preset (for example 16:9, 9:16, or 1:1), then the backend computes a centered crop rectangle from the input video’s dimensions and processes the full video using FFmpeg’s crop filter. The tool supports both manual cropping via an AI-suggested crop box and automatic center-cropping when no crop box is provided. An optional AI Assistant can generate a safer crop rectangle from a preview frame, but it only suggests values—your video is cropped only when you click the main “Crop video” button. A built-in Sample Input button loads a short MP4 so you can test the workflow right away. Output video is re-encoded to H.264 (MP4) for reliable playback across devices and platforms.