TikTok is built for tall video. Hold your phone upright and the whole screen is the picture. A wide clip filmed on a camera, a laptop or a drone does not fit that screen, so it shows up small, with large empty bands above and below. To resize video for TikTok, you turn it into a tall 9:16 frame at 1080×1920.
This page opens the resize tool with that size already chosen. It is also the Instagram Reels size and the YouTube Shorts size, so one file works for all three. Drop your clip, decide how it should fill the frame, and press Resize. The work happens in your browser, so your video is never uploaded.
Below you will find the best way to turn a wide clip into a tall one, what to do when you cannot afford to lose the edges, and how to check the result before you post.
One 9:16 size for TikTok, Reels and Shorts
On this tool, the TikTok video size, the Instagram Reels size and the YouTube Shorts size are one and the same: a 9:16 frame, 1080 pixels wide and 1920 pixels tall. On the Size tiles it is the one called 9:16 vertical, with the note "TikTok, Reels, Shorts". That is a tall shape, nearly twice as high as it is wide, which matches a phone held upright.
If your video is already 9:16, resizing to this tile mostly just sets it to a clean 1080×1920. If it is wide, as most camera footage is, the shapes differ and you need to decide what happens to the picture. That choice is the most important one on this page.
| Your video | Shape | On the 9:16 tile |
|---|---|---|
| Phone video filmed upright | Already tall | A clean fit with little or nothing lost |
| Phone video filmed sideways | Wide | Needs Fill, which crops, or Fit, which adds bars |
| Camera or screen recording | Wide 16:9 | Same: Fill crops the sides, Fit adds bars |
| Square clip | 1:1 | Fill trims the sides, Fit adds bars above and below |
How to resize a video for TikTok
- Drop your video onto the page, or choose it from your device. You can add several clips and resize them together.
- Check that the 9:16 vertical tile is selected under Size. The From line shows your original size, and To should read 1080×1920.
- Under "When the shape is different", choose Fill, Fit or Stretch. Fill is selected for you.
- Watch the stage preview. It shows the tall frame and how your picture sits inside it.
- Press Resize and save the new MP4, or download several as a zip.
If you have several clips to prepare, drop them all in together. They are resized with the same settings, so a batch from the same shoot comes out in the same shape. The zip download keeps them in one file.
Because nothing is uploaded, a long clip does not have to wait in a queue. It also means there is no account, no watermark and no cost.
Horizontal to vertical video: Fill, Fit or Stretch
Turning a wide video into a tall one is the job most people come here for. A tall frame is far narrower than a wide picture, so to make a video vertical, something has to be left out or shrunk. The three tiles decide which.
Fill: cover the whole screen
Fill scales the picture until it covers the tall frame, then crops what hangs over. You get no bars. The cost is that the left and right edges of a wide shot are cut off, so a lot of the width is lost. This works well when the subject is in the middle, such as a person talking to camera, a product on a table or a close-up of food.
Fit: keep everything, accept bars
Fit shrinks the picture until all of it is visible and adds bars above and below. Nothing is cut off, but the picture is small in the middle of the screen. Choose Fit when the whole frame matters, for instance a wide landscape, a screen recording or a shot with text near the edges.
Stretch: usually not for TikTok
Stretch pulls a wide picture into the tall shape and distorts it. People look thin and circles become ovals. It is almost never the right choice for video that has faces in it.
Which should I pick?
Prepare a clip for TikTok, Reels or a YouTube Short
A few quick steps before the resize make the result better.
- Straighten it. If a phone clip plays on its side, use rotate video first, so the picture is upright before you size it.
- Cut it down. Use trim video to remove slow starts and endings, so the sized file is only the part you want to post.
- Frame it. If the subject is not in the middle, crop to 9:16 first, so Fill does not cut the wrong thing.
- Flip it, if the shot needs it. Flip video left to right when writing reads backwards, or make an upside down video for a top-to-bottom effect.
It is also worth checking the clip once the new file is saved. Play it through, look at the edges, and make sure faces, captions and anything you filmed near the edge of the frame are still where you expect them. If something is cut, go back, change the fit or crop first, and run it again.
Making a clip bigger than its original cannot add detail. A small, low-quality video resized up to 1080×1920 will have the right shape and size but will still look soft. If you have the choice, start from the highest-quality version you have.
A Short usually uses a small piece of a longer video, so trim first and resize second.
Your original is never changed. If the clip was made for the normal YouTube player, you keep that wide version and get a separate tall file for Shorts.
Free, private and in your browser
The resize runs on your own computer. The video is never uploaded and the server does no video work, which is a comfort when the clip is a draft or has people in it who have not agreed to be online yet.
- Free, with no account and no watermark.
- Video tools are not counted in the free daily limit, which applies to document conversions only.
- Works in current Chrome, Edge and Firefox.
- Most videos have no size limit. A few files, such as certain AVI or WMV videos, take longer and can be up to 2 GB.
The output is an MP4 and its name ends with the size, so you will see _1080x1920 on the saved file. For other tools, browse all the video tools.
Get your clip ready for TikTok
The 9:16 vertical tile gives you the Instagram Reels size and the TikTok video size in one file, 1080×1920, and YouTube Shorts use the same frame. To resize video for TikTok, Reels or Shorts, pick Fill to cover the screen or Fit to keep every part of the picture. Trim, rotate or crop first if the clip needs it, and check the stage preview before you save.
It is free, private and watermark-free. Drop your video in the tool above and press Resize.
