MP4 Video Resizer

1. 1

   Add MP4 video

   Select your MP4.

2. 2

   Set target size

   Pick a preset (e.g. 720p, 1080p) or enter width and height. Lock aspect ratio if you want to avoid distortion.

3. 3

   Resize

   Start resizing.

4. 4

   Download

   Download the resized file. Choose MP4, WebM, or MOV as output when available.

MP4 (often H.264) is the most common sharing format. Resizing MP4 adjusts frame size for platforms, messaging limits, or performance. Our tool scales frames and re-encodes; you can keep aspect ratio and pick output format.

MP4 vs the other formats

Use this page when your source or target workflow is MP4-focused—for example phone footage, downloads, or exports that must stay MP4-friendly. For web-only delivery, WebM may be smaller; for Apple-centric workflows, MOV is common. You can still export MP4, WebM, or MOV after resizing.

Compatibility

Resized MP4 (H.264) plays broadly on phones, desktops, TVs, and browsers. Match resolution to YouTube, Instagram, or other specs before upload.

A target frame rarely has the same shape as the clip you are starting from, and there are only three honest answers to that. This tool asks you which one you want instead of picking silently.

The three choices

• Fit: the whole picture, scaled down until it sits inside the target. Nothing is cropped and nothing is distorted, so the output can end up smaller than the frame you asked for. This is the default and the right answer most of the time.
• Fill: the frame is filled exactly and whatever hangs over the edges is trimmed, centred. This is the answer to "resize for Reels without black bars" — a 16:9 clip becomes a true 1080x1920 vertical with no letterboxing.
• Stretch: the exact frame, aspect ratio ignored. Useful when a specification demands a size and the distortion does not matter; the tool warns you when it would be visible.

If you want the bars but want them to look deliberate — a blurred, coloured or mirrored background rather than black — that is a different job, and the aspect ratio tool does it.

Shrinking a picture means deciding what happens to the detail that no longer fits. The rule that decides it is the resampling filter, and most video tools never let you see it, let alone choose it.

What each one is for

• Lanczos: the default, and the sharpest. It looks at a wide neighbourhood around every output pixel, which is what keeps fine texture readable through a big reduction such as 4K to 720p.
• Bicubic: slightly softer than Lanczos and slightly less prone to ringing on hard edges. A good choice for graphics and screen recordings with a lot of flat colour.
• Bilinear: the simplest smooth option. Fast, soft, and the closest match to what most other resizers do without telling you.
• Nearest: no blending at all. The only correct choice for pixel art and for anything where a hard edge must stay hard.

Scaling is hardware accelerated, so the sharpest filter costs no more time than the simplest one. There is no reason to trade quality for speed here.

Prefer downscaling over upscaling. Lock aspect ratio unless you need a fixed frame. Heavier bitrate on export can help after large downscales; very small resolutions may look soft on big screens.

Best practices

• Choose resolution for the smallest screen that matters.
• Maintain aspect ratio to avoid stretched subjects.
• Preview after resize before sharing widely.
• Use MP4 output for maximum device support.

If the size you asked for is the size the clip already is, nothing is re-encoded at all: the compressed frames are copied straight across, which takes a fraction of a second and leaves the picture bit for bit identical.

Powered by optimised video encoding pipelines.

Example use cases

• Shrink 4K phone MP4 to 1080p for faster upload.
• Fit 16:9 MP4 to vertical 9:16 for short-form platforms.
• Reduce resolution for email or chat limits.
• Match ad or banner pixel sizes from a master MP4.

Common use cases

• Social uploads: Match square, vertical, or HD sizes required by each app.
• Web embedding: Use lighter dimensions for faster page load.
• Archiving: Store smaller copies alongside originals if space matters.
• Presentations: Downscale large clips so decks stay responsive.
• Messaging: Meet attachment limits by lowering resolution.

• All video formats (MP4, WebM, MOV)
• Resize WebM
• Resize MOV

• Video resizer
• Video compressor
• Video to GIF
• Video cropper
• Cut video
• GIF maker
• Image to video