Video Resizer
Scale a video down to 1080p, 720p, 480p and more, exported as MP4.
Drop a video here or click to browse
MP4, MOV or WebM - up to 100 MB, processed in memory.
All image and video tools
Video Converter
Convert between MP4, MOV, WebM and GIF.
Video Trimmer
Cut a clip down to just the part you need.
Video Resizer
Scale a video down to 1080p, 720p and more.
Extract Audio
Save the soundtrack as MP3, AAC, FLAC or WAV.
Mute Video
Strip the sound and keep the picture untouched.
Direct links to every format pair we ship.
Video Converter
Convert between MP4, MOV, WebM and GIF - transcoded in memory.
Video Trimmer
Cut a clip down to just the part you need.
Video Resizer
Scale a video down to 1080p, 720p and more.
Extract Audio
Save the soundtrack as MP3, AAC, FLAC or WAV.
Mute Video
Strip the sound and keep the picture untouched.
Direct links between MP4, MOV, GIF and WebM.
Browse what others have made or pick up where you left off.
A video resizer changes the resolution of a clip - the pixel dimensions of the picture itself. Pick a target height and the width is calculated automatically, so the aspect ratio is never distorted. Resizing runs server-side with ffmpeg entirely in memory: the upload is never written to disk and nothing is left after the response is sent.
What a Video Resizer Actually Does
Resolution is the pixel grid your video is stored in - 1920x1080 means 1920 pixels across and 1080 down. A video resizer decodes each frame, samples it down to a smaller grid, and re-encodes the result. Every frame is rebuilt at the new size, which is why resizing is a real transcode rather than a metadata change.
You choose the height and the tool derives the width from your video's own aspect ratio. A 16:9 clip scaled to 720p becomes 1280x720; a 9:16 phone recording at the same setting becomes 405x720. Nothing is stretched, squashed or cropped - the frame keeps its proportions, just at fewer pixels.
Why Resize a Video
- Smaller files: pixel count drives file size. Halving the resolution removes roughly three quarters of the pixels, and the file usually shrinks dramatically as a result.
- Upload limits: when a clip is a little too large for a platform or for the 100 MB cap here, dropping from 4K to 1080p is often enough on its own.
- 4K footage nobody needs in 4K: phones record at very high resolutions by default. For something destined for a chat window or an email, 720p looks identical and is a fraction of the size.
- Web embedding: serving a 4K file to a player displayed at 800 pixels wide wastes bandwidth on pixels the viewer never sees.
- Older devices and slow connections: lower resolutions decode more easily and buffer less on constrained hardware or poor networks.
How This Video Resizer Works
Drop a single video onto the upload card or click to browse. The clip appears in a preview player so you can confirm you have the right file. Pick a target from the Resolution dropdown - 2160p Ultra HD, 1440p Quad HD, 1080p Full HD, 720p HD, 480p SD or 360p Small - and click "Resize video". A progress bar tracks the job, and the resized clip plays inline with a download button when it finishes.
The default is 720p, which is the usual sweet spot for sharing: clearly watchable, dramatically smaller than the original, and universally supported. Files up to 100 MB are accepted, one at a time, and the output is always MP4 with H.264 video.
Choosing a Resolution
- 2160p (4K): only worth keeping when the footage will be viewed on a large screen or edited further. Very large files.
- 1440p (2K): a middle ground between 4K and Full HD, useful for high-quality web delivery without full 4K weight.
- 1080p (Full HD): the standard for most video today. Sharp on phones, laptops and TVs alike.
- 720p (HD): the practical default. Noticeably smaller than 1080p and hard to tell apart on a phone screen.
- 480p (SD): for email attachments, previews and anywhere size matters more than sharpness.
- 360p (Small): the smallest option, for thumbnails, quick previews and very tight constraints.
Resizing Is Not Compressing
These get confused constantly. Resizing reduces the pixel dimensions - the picture genuinely becomes smaller. Compressing keeps the dimensions and squeezes the data harder, trading fine detail for a smaller file at the same resolution. Both shrink the file, but only one changes what the viewer sees.
Resize when the video is larger than it needs to be for where it is going. Compress when the resolution is already right but the file is still too heavy - for that, the video compressor on simplesize.app is the sister tool for the job.
One thing worth knowing: this tool is intended for scaling down. Selecting a height larger than the source will upscale it, which adds file size without adding detail, because the missing pixels have to be invented rather than recovered.
Other video tools that pair with resizing: trimming a clip to the part you need, converting to another format, extracting the audio track, and removing the sound.
FAQ
No. You choose only the height, and the width is calculated from your video's own aspect ratio, so the proportions are always preserved. A 16:9 clip at 720p becomes 1280x720; a vertical 9:16 phone recording at the same setting becomes 405x720. Nothing is stretched, squashed or cropped - the frame is simply rebuilt at fewer pixels.
Resizing reduces the pixel dimensions, so the picture itself becomes smaller - a 1080p clip turned into 720p has fewer pixels in every frame. Compressing keeps the dimensions and squeezes the data harder instead, trading fine detail for a smaller file at the same resolution. Both shrink the file, but only resizing changes what the viewer actually sees. If the resolution is already right and the file is still too heavy, the video compressor on simplesize.app is the tool for that.
It depends on the content, but the reduction is usually substantial. Halving the resolution removes roughly three quarters of the pixels, since both dimensions shrink at once - 1080p to 540p is a quarter of the pixel count, not half. The file rarely shrinks by exactly that ratio because compression efficiency varies with the footage, but going from 4K to 1080p or 1080p to 720p typically makes a dramatic difference.
You can select a height larger than the source, but it will not improve the video. Upscaling invents pixels by interpolating between the ones that exist - the result is a bigger file with the same amount of real detail, often looking slightly soft. This tool is designed for scaling down. Genuine upscaling that adds detail requires AI reconstruction, which is a different kind of processing entirely.
720p for most purposes - it is the default here because it is hard to distinguish from 1080p on a phone screen while being considerably smaller. Use 1080p when the clip will be watched on a laptop or TV, 480p or 360p for email attachments and previews where size matters more than sharpness, and 1440p or 2160p only when the footage genuinely needs that detail or will be edited further.
Yes. Resizing affects the picture only - the audio track is carried through unchanged in duration and synchronisation. If you also want to remove the sound, the mute video tool strips it without re-encoding the picture, and the extract audio tool saves the soundtrack on its own as MP3, AAC, FLAC or WAV.
MP4, MOV and WebM are accepted as input, up to 100 MB per file. The output is always MP4 with H.264 video, regardless of the input container, so resizing a MOV or WebM also converts it to the most widely playable format in the same pass.
No. The file is sent to the server because resizing needs ffmpeg, but it is never written to disk. It is held in memory for the duration of the job, the resized clip is returned to your browser, and the buffer is released as soon as the request completes. Nothing is stored, logged or cached. The preview you see before resizing is your own local file and is not uploaded until you press the button.