Video aspect ratio converter
Preview your video in a different aspect ratio. Check the product, faces and text before exporting the cropped or padded version.
MP4 or WebM, up to 50 MiB, 60 seconds and 4,096 pixels on either side. These are this tool’s limits. The browser must be able to play your source.
Move the slider to adjust which part of the video stays in view, or where the image sits in the added space. Check the product and all text before exporting.
Output framing preview
Choose a video to see its actual frames here.
720 × 1280 · Output format unavailable
Enable JavaScript for local file preview and export. The manual framing guide below works without it.
Files remain in this browser tab. No upload, microphone or camera permission is used. Export runs in real time and may take longer on slower devices. Hiding the tab cancels it. Output format is chosen from this browser’s supported recording formats. Refreshing loses local inputs and outputs.
Choose crop or added space deliberately
Crop to fill the new frame, or keep the whole shot and add space around it. Cropping can cut off a product or line of text. Added space can make the details smaller. Neither option can recover anything outside the original shot or move text that’s already part of the video. Check the final file against the placement you plan to use.
| Choice | What remains visible | What to review |
|---|---|---|
| Keep the whole frame | The full source becomes 720 × 405, with 875 pixels of added vertical space. | Product detail and baked-in text may become small. Check the actual export at its intended viewing size. |
| Fill and crop | The source is scaled to the portrait height and its left/right edges are cut. | A face, product or claim near either edge may disappear. Adjust the framing position and inspect the entire clip. |
These are geometric examples, not platform safe-area or performance rules. The preview uses the actual loaded video. The exported file should be reviewed independently.
Change the frame around your video. Keep the whole image with added space, or fill the destination frame by cropping its edges. Preview the product and text, then export a new local file.
Review the full exported clip
- Choose a source the browser can play and inspect its full duration.
- Select portrait, square or landscape, then preview crop or added space.
- Check the product, faces and every baked-in text line at the beginning, middle and end.
- Choose whether to retain source audio or make an explicitly silent export.
- Export with the tab visible, play the returned file and download it locally.
A quiet opening doesn’t mean the file has no audio. Play the full export and check speech, music and sync. If you’re editing someone else’s creative, check that you have permission to use and change it.
Browser, file and output limits
This is a local browser recording workflow for short, playable MP4 or WebM sources. It handles up to 50 MiB, 60 seconds and 4,096 pixels on either source side, and offers 3 fixed output sizes. Export runs in real time at a requested 24 frames per second. Actual encoded timing can vary by device. It is not a lossless or frame-exact professional transcode.
The browser selects an available WebM or MP4 recording format. The interface displays the actual chosen container before export. A successful format-support check can still be followed by an encoding failure. An error produces no downloadable success file. If the browser cannot record this canvas stream, use a compatible browser or your usual editor.
There is no cloud processing, camera access or microphone recording. We process the video in this tab. Download the result before refreshing or closing it. This tool does not send your uploaded file to our analytics.
What changes when I change a video’s aspect ratio?
The exported frame’s width-to-height proportion changes. Keeping the whole image scales it inside that frame. Filling the frame scales and crops it. This tool produces an actual video file, while the existing ratio calculator only works out proportional dimensions.
Does the export meet Meta or TikTok requirements?
The right shape and file format do not guarantee that a platform will accept your ad. Check current placement requirements, duration, file size, text visibility and audio separately. This tool does not publish to an ad account or predict performance.
Which browser features does this use?
Local playback, canvas capture and MediaRecorder encode the visible frame. Web Audio carries the source’s audio when selected. See the canvas capture documentation and recording format-support documentation. Capability detection and the actual export result determine what works on your device.