How to use the Check Video Resolution tool
- Choose your video file.
- The answer appears at the top of the card.
- Scroll for the full details: file, video and audio.
- Copy as text or download the JSON if you need to share it.
About this tool
Resolution is the number of pixels in each frame, written as width by height. This tool reads it from the file itself, along with the aspect ratio and whether the video carries a rotation flag, which is what makes some phone videos appear sideways in certain players.
Reading is instant because only the file's index is parsed, not the video itself: even a multi-gigabyte file answers in a moment. You can copy everything as text or download it as JSON, which is handy for bug reports and support tickets.
Why use ToolsCrow for this
- Instant. Only the index is read, not the whole file.
- Complete. File, video and audio details in one place.
- Copy or export. Plain text or JSON.
- Private. The video is never uploaded.
Good to know
- It reads MP4, MOV, M4V, WebM, MKV, 3GP and FLV. Browsers cannot open AVI, WMV or MPEG files, so those cannot be inspected here.
- It shows what the container declares. Specialist tools such as MediaInfo or ffprobe report more, for example colour space and HDR metadata.
Frequently asked questions
Is my video uploaded to a server?
No. Everything runs inside your browser tab using your own device's video hardware. Your file is never sent to ToolsCrow or anyone else, which also means there is no waiting for an upload and it keeps working if your connection drops after the page has loaded.
Is it really free? Is there a watermark?
It is free with no sign-up, no watermark and no daily limits. The only limits are the ones your device sets: memory and processing power.
How large a video can I use?
Because the video is processed on your device, the limit is your device's memory rather than a server quota. Phone clips of several hundred MB are fine on most devices, and desktop computers usually handle 1 to 2 GB. Files over about 4 GB are not supported.
Which browsers work best?
Current Chrome, Edge and Safari (16.4 or newer, including iPhone and iPad) work best because they include the WebCodecs video engine. Recent Firefox versions work for many files. Older browsers fall back to a much slower real-time mode or may not work at all.
Is 1920×1080 the same as 1080p?
Yes. 1080p means 1080 pixels tall in a 16:9 frame, which is 1920×1080. A vertical phone video of 1080×1920 is also "1080p" in the sense that its short side is 1080 pixels.
Is my video uploaded to check it?
No. The file is read directly in your browser, and only the first part of it is needed.
Does it work with large files?
Yes. Only the index is read, so a 4 GB file is as fast as a small one.
Related video tools
- Video InfoDrop in a video and see the answer straight away.
- Video Duration CheckerDrop in a video and see the answer straight away.
- Video Codec CheckerDrop in a video and see the answer straight away.
- Video Frame Rate CheckerDrop in a video and see the answer straight away.
- Video ConverterConvert a video to MP4, WebM or MOV without uploading it anywhere.
- Video CompressorShrink any video to a fraction of its size while keeping it sharp, or type the exact size you need in MB.
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