Yes. Checking your video's resolution is completely free, with no sign-up.

Do you upload my video?

No. Everything runs in your browser, so your video never leaves your device.

What does 1080p or 4K mean?

They are shorthand for resolution. 1080p is 1920 by 1080, and 4K is 3840 by 2160. The number is the shorter side of the frame.

How do I read the aspect ratio?

It describes the shape of the frame. 16:9 is widescreen, 9:16 is tall for phones, and 1:1 is square.

Which video formats work?

MP4, WebM, MOV, M4V and more open instantly. A few formats your browser can't decode, such as some HEVC or MKV files, are read with a slower fallback that still runs on your device.

Is there a file size limit?

You can check videos up to 500 MB on desktop and 100 MB on mobile.

Does it work on my phone?

Yes. It works in any modern mobile browser, with no app to install.

How do I change my video's resolution?

Use a resizing or compression tool. Sondra's Compress Video tool can lower the resolution and file size right in your browser.

Check your video's resolution

See the exact width and height of any video, along with its aspect ratio, quality label and orientation. It all happens in your browser, so nothing is uploaded.

Drop a video here or click to upload

MP4, WebM, MOV, MKV and more

Up to 500MB on desktop, 100MB on mobile

Instant 100% private Free

How to check a video's resolution

Add your video

Drop in an MP4, WebM, MOV or other video. It stays on your device.

Read the details

Sondra shows the resolution, aspect ratio and quality label right away.

Use what you learn

Resize, compress or convert with confidence, or pick the right platform.

What is video resolution?

Resolution is the number of pixels in your video, written as width by height, such as 1920 by 1080. More pixels means a sharper, more detailed picture and a larger file.

You will often see a shorthand label instead of the raw numbers. 1280 by 720 is called 720p or HD, 1920 by 1080 is 1080p or Full HD, and 3840 by 2160 is 4K. The number refers to the shorter side, so a vertical 1080 by 1920 clip is still 1080p.

Aspect ratio describes the shape of the frame. 16:9 is the standard widescreen used on YouTube and TVs, while 9:16 is the tall shape used for TikTok, Reels and Shorts. Knowing both helps you resize a video without stretching or cropping it by accident.

Common video resolutions

Here are the sizes you will run into most often.

720p (HD)

1280 by 720. Light and fast, fine for quick clips and slower connections.

1080p (Full HD)

1920 by 1080. The most common size for online video and a safe default.

4K (Ultra HD)

3840 by 2160. Very sharp and great for large screens, though the files are big.

9:16 vertical

1080 by 1920. The full-screen shape for TikTok, Reels and Shorts.

Resolution by platform

A quick guide to what each platform expects.

YouTube

1920 by 1080 (16:9) works everywhere. Upload 4K if you have it for extra sharpness.

TikTok

1080 by 1920 (9:16), full-screen vertical. Other shapes get bars added.

Instagram Reels

1080 by 1920 (9:16). A square 1080 by 1080 also works for feed posts.

YouTube Shorts

1080 by 1920 (9:16), vertical, up to 60 seconds.

Private by design

Sondra reads your video's details inside your browser. The file is never uploaded to a server, so your footage stays on your device.

There is no account and no sign-up. Close the tab and nothing is left behind.