Resize Video: Change Video Resolution
Change video dimensions for sharing, publishing, or smaller files. Your files are never uploaded to our servers. ToolkitPoint processes them on your own computer, so confidential documents stay with you.
Processed in your browser. Your files are not uploaded.
How to use Resize Video: Change Video Resolution
- Choose one or more videos with "Choose one or more local videos"; the framing preview shows the first one.
- Pick "Size (length of the SHORT side)": 1080p means 1080 px on the shorter side, so portrait and landscape clips both come out right. Tick or clear "Never enlarge beyond the original".
- Optionally change "Shape (aspect ratio)" to 16:9, 9:16, 1:1, 4:5 and choose fill and crop, fit with a solid or blurred background, or stretch. Drag on the preview (or use the focus sliders) to choose what stays in frame; "Rotate" turns the video.
- Under Encoding choose MP4 or WebM, a frame rate, and either a CRF quality or "Target file size (MB)", and optionally remove the audio.
- Press "Resize". Each file is named with its final size; several files also get "Download all as ZIP".
Worked example
Load a 3840 x 2160 clip, choose the 720p size, set "Target file size" to 8 MB and press Resize. The list shows the output will be 1280 x 720 and about 8 MB; the file is written as name-1280x720.mp4 and the note reports the measured size. Changing Shape to 9:16 with "Fill and crop" would give 720 x 1280 instead.
When to use this tool
- Downscaling a 4K drone clip to 720p under an upload limit.
- Turning a landscape clip into a 9:16 vertical video for Reels or Shorts, choosing the crop with the focus point.
- Making a square 1080 video with a blurred background instead of black bars.
- Resizing a folder of clips to the same size and downloading them as one ZIP.
Important limitations
Every resize re-encodes the picture (H.264 MP4 or VP8 WebM) in the browser, so long or high-frame-rate clips need enough memory and time; files over 250 MB are rejected. The target size is checked after encoding and retried up to twice, and an impossible target is reported instead of hidden. Audio is re-encoded to AAC or Opus (or removed).
Frequently asked questions
How is the size chosen for vertical videos?
The preset is the length of the shorter side, so 1080p on a 1080 x 1920 phone clip stays 1080 x 1920 instead of being enlarged. The old width-based presets enlarged portrait clips.
Will the tool enlarge a small video?
Not by default: "Never enlarge beyond the original" caps the output at the source size and tells you. Clear the box to enlarge anyway; that only makes the file bigger without adding detail.
What happens when the new shape differs from the video?
"Fill and crop" zooms in and cuts the edges around your focus point, "Fit whole picture" keeps everything and fills the gaps with a colour or a blurred copy of the video, and "Stretch" distorts the picture to fit.
How does the target file size work?
The tool works out a video bitrate from the clip length and your target, encodes, measures the result and re-encodes at a lower bitrate up to two more times if it is still over. If the target is too small for the length it says so instead of producing a poor file.
Is audio changed?
Audio is re-encoded (AAC for MP4, Opus for WebM) so it always fits the container; tick "Remove the audio" to drop it. Clips with no sound are handled normally.