REFRAME THE FINISHED VIDEO
Change video aspect ratio: keep the moment in frame
Change video aspect ratio by choosing a new output shape, then cropping the edges or fitting the whole picture inside borders. Compare both treatments on a licensed film excerpt, adjust the frame, and export a real video locally. Use this tool to change video aspect ratio for clips up to 60 seconds without an account or a file upload.
- Free to use
- No account needed
- Local video export
YOUR VIDEO, REFRAMED
Browser only · No uploadKeep the moment. Change the frame.
Choose a clip up to 60 seconds and 100 MB. Your file stays in this browser.
Original
Your source clipLoad the sample or choose your video.
Compare the whole shot with your new frame.
No file selected
Output · 9:16
720 × 1280Your reframed preview appears here.
Nothing is stretched.
Crop fills the new shape. Choose Fit if you prefer the whole image with borders.
Checking browser export support…
Compare
Watch the whole shot in its original and new shape.
Frame
Keep the full image with borders or move the crop.
Export
Download a real video and check picture and sound.
In this guide 8 sections
Change video aspect ratio around the story
Start with what must stay visible
Before you change video aspect ratio, identify the detail a viewer needs to understand the moment. A face, an open hand, a diagram label, and a second character may compete for a narrow frame. Play the entire shot and write down which details cannot disappear. The converter starts with Crop so the picture fills your selected shape. Then change video aspect ratio with Fit to compare the complete shot with added borders. The outlined preview marks the actual output frame; the checkerboard around it is not exported.
You can change video aspect ratio without changing playback speed or intentionally stretching a character. Fit scales the complete picture uniformly and fills unused space with your chosen color. Crop scales uniformly until the output is covered, then removes the excess at its edges. Neither option invents scenery outside the original frame. To change video aspect ratio successfully, decide whether filling the screen matters more than preserving the relationship between objects. A border can be the more faithful editorial choice.
Change video aspect ratio with a real film excerpt
The outstretched-arms test
The sample is twelve seconds from Big Buck Bunny, beginning at 00:50 in the official 2008 film. The rabbit emerges from a burrow with his arms spread, then the sequence cuts to a low angle. Load it to change video aspect ratio and watch the hands near the edges. This is an externally produced, licensed animation, not an SI generation or evidence of social performance. The same excerpt is available in the hero player so you can change video aspect ratio while checking your decisions against the source.
Select 9:16 and Crop to change video aspect ratio in the sample. A centered portrait frame keeps only 31.6% of the original image area. The broad opening gesture loses context at the sides; moving the crop toward one hand necessarily sacrifices space on the other side. Switch to Fit to see both sides again. When you change video aspect ratio, this is a concrete decision about what the viewer learns, not simply a choice between a good shape and a bad shape.
| Treatment | Picture retained | What changes |
|---|---|---|
| Crop | 31.6% of source area | Side detail is removed; the selected region fills the frame. |
| Fit | 100% of source area | The whole image scales to 720 × 405, with borders above and below. |
Change video aspect ratio without losing the subject
One position for the complete clip
To change video aspect ratio with Crop, use the horizontal slider when excess image extends beyond the left and right edges. Zero aligns the left edge; one hundred aligns the right edge. The vertical slider does the equivalent for top and bottom. A slider is disabled when there is no travel in that direction. Watch the new frame while you change video aspect ratio, then scrub through the original player to inspect later moments. The crop position stays fixed across the clip.
A fixed position cannot follow a moving subject automatically. If you change video aspect ratio for footage with a runner crossing the screen, a slide transition, or several people speaking, the subject may leave your selection. This converter does not track faces or animate the crop. Change video aspect ratio with Fit when the complete sequence must stay visible. For a moving close-up, split the source into shots in an editor and give each shot its own framing or keyframed movement.
Change video aspect ratio while keeping the whole picture
More pixels do not restore detail
Choose Fit to change video aspect ratio when information at opposite edges is essential. The output shape changes, but the full source remains visible inside it. Dark green is the initial border color; select a different color to match your footage or presentation. The empty area becomes part of the encoded video. It is not transparent. If you change video aspect ratio for an interview or instructional screen recording, compare whether the smaller content is still legible on a phone.
Dimensions describe the exported frame, not the detail recovered from your source. When you change video aspect ratio, this tool reports enlargement whenever scaling exceeds the source resolution. Our example begins at 640 × 360, so a full-height portrait crop enlarges a small part substantially. A larger download will not restore fur texture or sharp edges. Change video aspect ratio from your highest-quality original whenever possible, and save the original separately so future versions do not accumulate compression damage.
Change video aspect ratio and download the result
A file you can actually play
After you change video aspect ratio, select Export to create an actual video file. The browser plays the source into the chosen frame and records the result locally. Export takes roughly the clip duration, with additional time for loading and finalization. Keep this tab visible throughout. You can cancel without losing the source or framing. To change video aspect ratio again, adjust a setting and export a fresh version; the previous download link is cleared so it cannot be mistaken for the new settings.
The button tells you whether your browser can export MP4 or WebM. This is checked on the device; a filename extension is never used to disguise another format. When you change video aspect ratio, audio is included if present unless you clear the audio checkbox. No microphone permission is needed. Change video aspect ratio, download the result, then open that saved file in your destination app. If the app refuses WebM, use an editor that genuinely converts it to a supported format.
Change video aspect ratio with a repeatable quality review
Inspect the saved result
Play the downloaded file from beginning to end after you change video aspect ratio. Check the opening frame, every cut, the last visible action, and the end of the soundtrack. A preview is useful, but only the saved file confirms your final result. Listen for missing sound and look for frozen or incomplete footage. When you change video aspect ratio on a busy or low-memory device, close unnecessary applications and use a shorter source if the recording stalls or cannot finish.
Also review text that was already burned into the video. To change video aspect ratio, a crop may cut those words while Fit may make them too small. This tool cannot recover missing letters or edit a baked-in subtitle. Return to the original editing project when text needs repositioning. Change video aspect ratio before adding final caption placement where practical. Keep captions away from essential visual details, and inspect the destination app preview because its controls may cover part of your encoded frame.
Change video aspect ratio within the browser limits
Know what your device can handle
You can change video aspect ratio here for files up to 100 MB, sixty seconds, and 4096 pixels on either side. MP4, WebM, and MOV are accepted as selections, but their internal codecs must also play in your browser. A file picker cannot guarantee decoding support. If a file fails, create an H.264 MP4 from your editing software first. Then change video aspect ratio using that compatible copy. Protected files and incomplete downloads are not suitable sources for this workflow.
The selected file is read locally to change video aspect ratio; it is not uploaded to an SI rendering service. The demonstration clip is downloaded only when loaded or played. Leaving or reloading the page discards the working session, so save your output before closing it. To change video aspect ratio on a phone, keep the browser visible and the device awake during export. The converter stops an export when the tab is hidden instead of offering an interrupted recording as a finished result.
Change video aspect ratio with clear source credits
Keep the attribution with the edit
The Blender Foundation licenses Big Buck Bunny under Creative Commons Attribution 3.0. The supplied credit records the film, original download, license, and our changes: a twelve-second excerpt, one added bottom pixel, and re-encoding. If you change video aspect ratio using this sample and share the result, carry the attribution forward and describe your additional changes. The license does not imply the filmmakers endorse your project. Change video aspect ratio on your own footage with equal care for the permissions attached to music, images, and recordings. Read the official attribution requirements.
The converter answers a file-editing task: change video aspect ratio and save a reframed clip. For platform-specific dimensions or duration checks, continue to the dedicated Shorts and Reels guides linked below. For an unreadable subtitle, use the caption reading guide before your next export. Those tasks need their own checks, even after the frame looks right. Change video aspect ratio only when it serves the story, then keep the source, the exported version, and any required credits together in your project folder.
Sources you can check
- Big Buck Bunny: official license and attribution ↗
- Big Buck Bunny: official download sources ↗
- Creative Commons Attribution 3.0 license ↗
- MDN: supported MediaRecorder output formats ↗
Check the original film, sample license, and browser format documentation.
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