TikTok Video Resizer: Resize Video for TikTok Online, Desktop and Mobile

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TikTok Video Resizer: Resize Video for TikTok Online, Desktop and Mobile

Last Updated: 2026. 05. 09

Every social platform has its preferred aspect ratio. For TikTok, it displays onscreen content in vertical, 9:16 format.

For those who want to share YouTube content to TikTok or post daily vlog in widescreen format on TikTok, resizing video to correct TikTok ratios is essential to avoid black bars and ensure a perfect fit, creating a more engaging viewing experience.

But how do you convert a video to TikTok format? Don’t worry — we’ve rounded up the 3 best TikTok video resizers to help you easily turn any video into a vertical format on desktop, online, or even on your mobile phone. Ready to explore them? Let’s get started!

Table of Contents:

3 Best Video Resizers for TikTok

FlexClip - AI-powered TikTok Video Resizer with Face Tracking CapCut - Free Way to Resize Video for TikTok on Desktop Inshot - Popular Tool to Convert Video to TikTok Size

Charming and engaging TikTok video templates for you:

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Use This Template

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Use This Template

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Use This Template

Also interested in: How to Make a Tik Tok Video that Gets Likes>>

FlexClip - AI-powered TikTok Video Resizer

FlexClip is an AI-powered TikTok video resizer that offers multiple ways to convert YouTube, Instagram, or any other videos into TikTok format in just a few clicks.

Beyond basic cropping, it also features advanced tools like AI-powered resizing that keeps the subject centered with face tracking, as well as smart clipping that automatically selects the most share-worthy moments from your original video. These intelligent features help create a more immersive and engaging viewing experience.

No software download or editing experience required. Just open FlexClip's TikTok video sizer in your browser and follow our lead to easily change video into TikTok aspect ratio.

Crop Video to TikTok

AI-powered TikTok Video Resizer

Method 1: Convert Video to TikTok Size by Cropping

The first way to convert a video into TikTok’s vertical format is by cropping it. FlexClip’s built-in video editor supports a wide range of popular aspect ratios, including 16:9, 1:1, 9:16, 4:5, 21:9, 3:4, and 2:1, making it easy to resize videos for different platforms. With just one click, you can instantly transform your video into TikTok’s standard vertical size. Here’s how to do it.

Step 1

Visit FlexClip's video editor and tap Upload Files to import your video from local files, mobile phone, Google Drive, Google Photos, One Drive, Dropbox, etc.

Upload the Video You Want to Resize to FlexClip

Step 2

Next, switch the default 16:9 ratio to the 9:16 vertical format. Then add or drag and drop your video onto the canvas to fit the screen. If the cropped result doesn’t look ideal, simply zoom in or adjust the frame to keep the main subject centered and visually appealing.

Crop Video into TikTok Video Size

Step 3

(Optional) Enhance your TikTok-format video with FlexClip's powerful AI features by turning text into lifelike voiceover, auto generating subtitle, adding unique background music, etc.

Enhance Cropped Video in FlexClip

Step 4

Once you're satisfied, hit on Export button to download or directly share cropped vertical video on TikTok platform.

Download and Share Cropped Video on TikTok

Method 2: Resize Video to TikTok Format with Face Tracking

Want to convert a video to TikTok format while keeping the speaker centered across every frame? FlexClip’s AI long-to-short generator makes it easy. It can turn a single long video into multiple viral-ready TikTok clips or convert the entire video into a vertical format while automatically keeping the speaker centered using face tracking. Follow the step-by-step guide below.

Step 1

Open FlexClip's long-to-short generator and add a video from local folder, Google Drive or even YouTube via a link.

Upload Video to FlexClip's Long-to-short Generator

Step 2

Once it's loaded, you'll be navigated to the Setup interface. From there, select the video language, setup the target genre, video aspect ratio and pick a subtitle layout, then hit on Generate.

Make Basic Setup of the Upcoming Video

Step 3

FlexClip automatically turns your video into bite-sized TikTok clips by analyzing the audio, detecting the most engaging moments, and reframing each segment so the speaker stays centered throughout. It also provides a virality score along with detailed recommendations, helping you quickly choose the most promising clips to share.

Preview AI-generated TikTok Bite-size Video

Pro Tips:Prefer a fully reframed video instead of short clips? Simply review the script and select the entire duration from start to finish. The AI will then recreate the full video in vertical format, while still keeping face tracking and auto-caption features enabled.

Select the Script as Entire Duration to Get Fully Reframed Video

Step 4

Optionally take the preferred clip to FlexClip's video editor to add a popular TikTok background music, insert engaging icons, or adjust pacing for personal touch. After that, feel free to download and share video on TikTok.

Open Reframed Video in FlexClip's Editor and Share with Ease

Method 3: Resize Video for TikTok Platform by AI Recreate

Prefer a method that not only resizes your video to TikTok format but also enhances it with aesthetic designs? FlexClip’s AI Recreate feature is exactly what you need. Powered by a template-based workflow and advanced AI, it analyzes your uploaded content, reimagines your assets, and automatically adds relevant text, effects, and styling that match your theme and story. No editing experience required. Here’s how to get started.

Step 1

Browse FlexClip's extensive library of TikTok templates, select the one you like and hit AI Recreate button below.

Browse FlexClip's Extensive Template Library and Pick Preferred One

Step 2

Upload your files and select text language, hit Generate button and AI will auto fill the template and generate matching text as the exact video style.

Upload Files and Recreate TikTok Video

Step 3

Preview the result in built-in video editor and customize as the way you like with ease. With everything settled down, export and share the creative creation on TikTok right now.

Preview, Edit and Share Creative TikTok Video

Bonus Tips: FlexClip is more than just a tool for resizing videos for TikTok—it also works as an AI TikTok video generator that helps bring your creative ideas to life. Whether you want to animate old photos for storytelling, create eye-catching face-morphing effects, or generate imaginative TikTok videos from text, FlexClip offers fast and simple solutions. Explore FlexClip and start creating today!

Unleash Creativity with FlexClip's AI TikTok Video Generator

CapCut - Free Way to Resize Video for TikTok on Desktop

CapCut is a popular video editor developed by ByteDance, the company behind TikTok, that lets you create and edit videos on desktop. To convert a video to TikTok size, it offers a simple free option—just one click to switch your video into TikTok format. Follow our step-by-step guide below to get started.

Step 1

Download and install CapCut software on your desktop. When it finishes, open CapCut and create a new project.

Step 2

Import one of your videos as the media you want to transform into TikTok size. Drag and drop it to the timeline, then split the whole video into a segment with bite-size suitable for TikTok if the video is long-duration. Delete unwanted parts and now you've got the desired TikTok video.

Step 3

Then go to Ratio, click on 9:16 option and CapCut will make the video in TikTok format. Here, you’ll need to manually adjust the size to keep the content centered. Simply drag to reposition and zoom in as needed to ensure the main subject stays in focus at the center of the frame.

Step 4

Export your video and upload it to TikTok.

Resize Video for TikTok on Desktop with CapCut

Inshot - Popular Tool to Convert Video to TikTok Size

InShot is an all-in-one mobile video editor designed for creating content for TikTok, YouTube, and Instagram. With support for multiple aspect ratios across different social platforms, it’s also a convenient tool for converting videos to TikTok size. Follow the guide below to learn how to resize a video to TikTok format using InShot.

Step 1

Open your InShot app on your smartphone device.

Step 2

Tap the “Video” button located at the bottom. Select the video you want to addict and tap on the arrow icon.

Step 3

Tap the Crop option, then proceed to resize your video by dragging the lines from its edges. Tap the arrow icon at the bottom right when you are done.

Step 4

Click on the Save button located at the top right side of your phone screen. And you are done.

Resize Video for TikTok on Mobile Using Inshot

The Bottom Line

As you can see, to come out with a perfect resized video, you need a perfect video resizer. This is why you need to consider using FlexClip: the best tool for resizing Tiktok videos. Finally, you can also deploy this tool to add speed, filters, or emojis to your videos. Give it a try!

Bella /

Full of vitality, curiosity and hope, Bella is an energetic copywriter at FlexClip. She mainly concentrates on video creation and troublesome issues related to video editing, providing users with practical solutions and tricks. Personally, Bella loves novels, sci-fi movies, cooking and travel. And, she believes that all her life is the best arrangement from God.