Resize Video
Resize Video make video dimensions smaller downscale mp4 without upload reduce video width locallyProcessing stays on this device. Choose one media file up to 200 MB.
- File:
- Size:
- Duration:
Result
Downscale a video to a practical width
Choose a video, check its preview, then select maximum width, video quality, and audio quality. Width choices run from 240 through 3840 pixels. The output keeps the original aspect ratio, never enlarges a narrower source, and retains the source base name with a -resized.mp4 suffix.
Dimensions versus file size
Resizing changes pixel dimensions, not a guaranteed byte target. Fewer pixels usually compress more easily, but duration, motion, noise, frame rate, audio, and quality settings also affect size. Use the Discord Video Compressor when an exact upload ceiling matters more than selecting a resolution.
Worked example: reduce a 4K phone clip
A 3840-pixel-wide recording is excessive for a small embedded demonstration. Choosing 1280 pixels reduces width to one third and pixel area to roughly one ninth while preserving shape. Balanced quality gives a useful starting point. Inspect text and fine lines before choosing the smaller-file option.
How aspect ratio is preserved
The selected number is a maximum width. FFmpeg calculates an even output height from the source ratio because H.264 playback commonly expects even dimensions. Portrait video remains portrait: a 1080 × 1920 clip already fits below a 1280-pixel width cap and therefore is not enlarged solely to fill the limit.
Quality settings and re-encoding
Resizing requires decoding and re-encoding the picture. Smaller-file mode permits more visual loss, balanced suits ordinary sharing, and higher quality retains more detail at a larger size. H.264 video, AAC audio, and fast-start MP4 metadata provide broad compatibility. Repeated resizing should be avoided because every lossy encode can add artifacts.
Local performance and limitations
The local WebAssembly engine is much slower than native desktop encoders and can use significant RAM. Inputs are limited to 200 MB. Keep the tab open and device awake during processing. Unusual codecs, damaged files, multiple audio streams, alpha channels, subtitles, chapters, or HDR metadata may fail or may not survive the conversion.
Resize Video FAQ
Will this crop my video?
No. It scales proportionally and preserves the visible frame shape.
Does 1280 mean 720p?
For a 16:9 landscape source, 1280 width produces about 720 height. Other aspect ratios produce different heights.
Can output be larger?
Yes. A short or already efficient source can grow after re-encoding.