Resize Video — Change Resolution & Aspect Ratio
Change a video's resolution or reshape it to 16:9, 9:16, 1:1 or 4:5 with bars, cropping or stretching.
Free, with no sign-up and no watermark. The file is processed in your browser and never uploaded.
Change a video's resolution, or reshape it for a platform. Scale keeps the original shape at a height from 240p to 2160p. 16:9, 9:16, 1:1 and 4:5 presets produce 1080-pixel-wide or tall frames, and you choose whether to fit the picture with bars, fill the frame by cropping the edges, or stretch it. You can also type a custom size.
Step by step
- Add your video: Drop it onto the upload area. Its current size is shown, with the new size below the options.
- Choose a shape: Pick Scale, a ratio preset or Custom size under Shape.
- Set the size: For Scale, pick a height. For Custom, type width and height in pixels.
- Choose a fit: For presets and custom sizes, choose Fit (add bars), Fill (crop edges) or Stretch.
- Resize: Click Resize Video. The result is MP4 (or WebM if your original was WebM).
Handy for
Vertical video
Turn landscape footage into 9:16 for short-form platforms.
Square posts
Make a 1:1 version for feeds.
Smaller files
Downscale 4K to 1080p or 720p for easier sharing.
Consistent sizes
Bring clips to the same resolution before merging them.
Good to know
Fill (crop edges) keeps the frame full but cuts off the sides — keep the subject centred.
Scaling up adds pixels but not detail.
Questions
Is my video uploaded anywhere?
No. The video is read, decoded and re-encoded inside your browser using its built-in WebCodecs encoders. Nothing is sent to a server, so private recordings stay on your device.
Will the audio be kept?
Yes — the soundtrack is carried over unchanged or re-encoded as needed for the output format.
Which file types can I use?
MP4, MOV, M4V, WebM, MKV and MPEG-TS videos. Older formats such as AVI, WMV and FLV can't be read in the browser — you'll see a clear message if you try one.
Which browsers work?
Recent Chrome, Edge and Safari (17 or newer) work best. Firefox can read most files but may lack some encoders, such as H.264 — if a format isn't available, the tool says so before you start. Phones work too, but long or 4K videos can run out of memory.
Further reading
- How to Compress a Video for WhatsApp, Email or an Upload Limit — Pick Target size in Compress Video, enter the MB limit and lower the resolution; trim first and convert MOV or MKV to MP4 if a file won't play.
More Video Tools tools
- Rotate Video — Rotate videos by 90°, 180° or 270° and mirror them, instantly via the rotation flag or by re-encoding.
- Change Video Speed — Speed up or slow down a video from 0.25× to 4×, keeping natural-sounding audio or removing it.
- Merge Videos — Join several video clips into one, in the order you choose, even if they differ in size or format.
- Add Audio to Video — Add music or a voice-over to a video, replacing or mixing with the original sound, without re-encoding the picture.
- Video to Images — Extract frames from a video as JPG or PNG images — every N seconds, a set number, or every frame.
- Images to Video — Turn photos into a video slideshow with crossfades, a chosen frame shape and optional background music.