Check Video Sizes Without Uploading

Video size means more than the file size. It also means the resolution, the aspect ratio, and the duration, and all four decide whether a video will upload cleanly and look right once it is posted. Checking them on your own device takes seconds and saves a wasted upload when something does not match.

Why check before you upload

A video that is the wrong shape gets cropped or padded, one that is too large can fail to upload or take a long time on a slow connection, and an unreleased video sent to an online checker is a copy of your work on someone else's server. Reading the file locally tells you whether it matches the format you need before you commit to an upload, and it keeps unreleased footage on your own device.

How to check a video's size, step by step

Open the TikTok Video Size Checker.
Choose the video file on your device. It is read locally in your browser and never uploaded.
Check the results: resolution, 9:16 aspect ratio, duration, and file size, compared against the 1080 by 1920 spec.
If something does not match, resize or re-export the video and check it again before uploading.

What decides a video's file size

Resolution. More pixels means a bigger file. A 1080 by 1920 vertical video is larger than the same clip at a lower resolution.
Length. A longer video has more frames, so the file grows with the duration.
Bitrate. A higher bitrate keeps more detail in each second of video, and makes a larger file. A lower bitrate shrinks the file but can soften the picture.
Format. The container and codec you export with affect the size too, so re-exporting with different settings is the usual way to shrink a video that is too large.

This checker covers the TikTok vertical format. Other platforms have their own size and format rules, so check each platform's requirements before you post there. The file size, resolution, and aspect ratio that work in one place do not always work in another.

The tool for this job

TikTok Video Size Checker: read a video file locally and check resolution, 9:16 aspect ratio, duration, and file size against the 1080 by 1920 spec. No upload.

Common questions

What does the video size checker look at? It reads the video file on your device and checks its resolution, its 9:16 aspect ratio, its duration, and its file size against the 1080 by 1920 spec.

What size should a TikTok video be? Vertical video at 1080 by 1920 pixels, a 9:16 aspect ratio. That is the size the checker on this site compares your video against.

Do I have to upload my video to check it? No. The checker reads the file locally in your browser, so the video never leaves your device.

Was this helpful?