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Resize Video for Twitter/X (Free, Online, No Upload)
Resize any video to Twitter/X's recommended dimensions right in your browser. Nothing gets uploaded to a server. Get the right aspect ratio and resolution so your video displays correctly in the timeline without cropping. The processing runs locally on your device.
Try it in your browser
Loading FFmpeg engine... (~31 MB)
Use the API
curl -X POST https://renderio.dev/api/v1/run-ffmpeg-command \
-H "X-API-KEY: ffsk_your_api_key" \
-H "Content-Type: application/json" \
-d '{
"ffmpeg_command": "-i {in_video} -t 140 -vf \"scale=1920:1080:force_original_aspect_ratio=decrease,pad=1920:1080:-1:-1:color=black\" -c:v libx264 -crf 23 -c:a aac {out_video}",
"input_files": {
"in_video": "https://example.com/input.mp4"
},
"output_files": {
"out_video": "output.mp4"
}
}'Need an API key? Get your free API key to start processing files programmatically.
Common Variations
Vertical format (9:16)
-i input.mp4 -t 140 -vf "scale=1080:1920:force_original_aspect_ratio=decrease,pad=1080:1920:-1:-1:color=black" -c:v libx264 -crf 23 -c:a aac output.mp4Square format (1:1)
-i input.mp4 -t 140 -vf "scale=1080:1080:force_original_aspect_ratio=decrease,pad=1080:1080:-1:-1:color=black" -c:v libx264 -crf 23 -c:a aac output.mp4Optimized for fast start
-i input.mp4 -t 140 -vf "scale=1920:1080:force_original_aspect_ratio=decrease,pad=1920:1080:-1:-1:color=black" -c:v libx264 -crf 23 -movflags +faststart -c:a aac output.mp4Platform Specs
Width
1920px
Height
1080px
Aspect Ratio
16:9
Max Duration
2:20
Related Operations
Need to process at scale?
Automate this with the RenderIO FFmpeg API. Process thousands of files programmatically or through no-code video automation.