Video Resizer — free online tool
Video Resizer runs entirely through temporary, in-memory processing: your file is uploaded, processed with FFmpeg, streamed back to you, and deleted immediately — nothing is stored permanently.
Drop a MP4, MOV, WEBM, MKV file here, or click to choose one
Processed temporarily, deleted afterDrop a MP4, MOV, WEBM, MKV file here, or click to choose one
MP4, MOV, WEBM, MKV
How it works
How resizing works
Video Resizer scales your video's frame dimensions up or down to the width/height you choose, re-encoding the video stream so it plays correctly at the new resolution on any device.
Picking dimensions
Keeping the original aspect ratio avoids stretching or squashing. Downscaling reduces file size and is useful before uploading somewhere with a resolution limit; upscaling increases file size without adding real detail.
Limitations
Uploads are capped in size for reliable processing, and only MP4, MOV, WEBM, MKV files are accepted here. For very large files or advanced editing needs, dedicated desktop software may work better.
Frequently asked questions
Will resizing distort my video?
Only if the new width/height don't match the original aspect ratio. Keep the ratio the same (e.g. halve both dimensions) to avoid stretching.
Can I upscale a small video?
Yes, but upscaling doesn't add real detail — it just increases the pixel dimensions and file size.