What is the best video size for TikTok, Reels and Shorts?

The standard for TikTok, Instagram Reels, and YouTube Shorts is 9:16 vertical at 1080×1920 pixels. This fills the entire mobile screen. Upload your video, pick the vertical format, and our resizer outputs a ready-to-post 1080×1920 file.

Does my video get uploaded to a server?

No. This tool runs entirely in your browser using your device’s own video encoder. Your file never leaves your computer, which means it’s private and fast, with no upload wait and no file size limits from us.

Is there a watermark or a limit?

No watermark and no daily limit. Because everything is processed on your own device, the tool is completely free to use as much as you want.

What is the difference between crop, fit and stretch?

Crop (cover) fills the whole frame and trims the edges that don’t fit, which is best for most social posts. Fit (contain) shows your entire video and adds bars to fill the frame. Stretch (fill) forces the video to the exact dimensions, which can distort it. For going from landscape to vertical, Crop usually looks best.

Can I resize to multiple formats at once?

Yes. Select as many platforms and aspect ratios as you need. Formats that share the same dimensions are encoded once and reused, so you get every version in a single pass and can download them all together.

Which video formats are supported?

You can upload MP4, MOV, WebM and most common video files. Output is always a widely compatible MP4 (H.264) file that plays everywhere and uploads cleanly to every social platform.

What is the best video size for TikTok, Reels and Shorts?

The standard for TikTok, Instagram Reels, and YouTube Shorts is 9:16 vertical at 1080×1920 pixels. This fills the entire mobile screen. Upload your video, pick the vertical format, and our resizer outputs a ready-to-post 1080×1920 file.

Does my video get uploaded to a server?

No. This tool runs entirely in your browser using your device’s own video encoder. Your file never leaves your computer, which means it’s private and fast, with no upload wait and no file size limits from us.

Is there a watermark or a limit?

No watermark and no daily limit. Because everything is processed on your own device, the tool is completely free to use as much as you want.

What is the difference between crop, fit and stretch?

Crop (cover) fills the whole frame and trims the edges that don’t fit, which is best for most social posts. Fit (contain) shows your entire video and adds bars to fill the frame. Stretch (fill) forces the video to the exact dimensions, which can distort it. For going from landscape to vertical, Crop usually looks best.

Can I resize to multiple formats at once?

Yes. Select as many platforms and aspect ratios as you need. Formats that share the same dimensions are encoded once and reused, so you get every version in a single pass and can download them all together.

Which video formats are supported?

You can upload MP4, MOV, WebM and most common video files. Output is always a widely compatible MP4 (H.264) file that plays everywhere and uploads cleanly to every social platform.

Free Tools

Free Video Resizer

Resize your videos for every social platform in seconds. Free, unlimited, and no watermark.

Everything runs right in your browser, so your video never gets uploaded to a server. Pick your platforms, choose how the video should fit, and download a ready-to-post file for TikTok, Reels, Shorts, YouTube and more.

Drop your video here or click to upload

MP4, MOV or WebM · up to 200 MB · your file never leaves your device

How should it fit?

Fill the frame, crop the edges. Best for most social posts.

Meta (Facebook / Instagram)

TikTok

YouTube

Twitter / X

Need the video itself, not just the size?

Turn a single idea into scroll-stopping AI videos. AI actors, voiceover, editing included.
400 free credits included.

Video Sizes

Supported Video Sizes for All Platforms

Every dimension you need for TikTok, Instagram Reels, YouTube Shorts, LinkedIn, Pinterest and Twitter/X.

Platform	Format	Aspect Ratio	Dimensions
Meta (Facebook / Instagram)	Reels / Stories	9:16	1080×1920
	Feed Square	1:1	1080×1080
	Feed Portrait	4:5	1080×1350
	Feed Landscape	16:9	1920×1080
TikTok	Vertical	9:16	1080×1920
YouTube	Shorts	9:16	1080×1920
	Landscape	16:9	1920×1080
LinkedIn	Square	1:1	1080×1080
	Portrait	4:5	1080×1350
	Landscape	16:9	1920×1080
Pinterest	Idea Pin	2:3	1000×1500
Twitter / X	Landscape	16:9	1280×720
	Square	1:1	1080×1080
	Vertical	9:16	1080×1920

Simple

How It Works

Resize your video in three steps. Upload once, get every social media format instantly.

Upload your video

Drop in any MP4, MOV or WebM. It stays on your device, nothing is uploaded.

Pick your formats

Select the platforms and aspect ratios you need, and how the video should fit.

Download your videos

Your browser resizes each format instantly. Download them all, no watermark.

Features

What You Get

A fast, private video resizer that gives you a clean file for every platform. No accounts, no watermark.

Private by design

Your video is resized on your own device. Nothing is ever uploaded to a server.

Instant & unlimited

No upload wait, no daily cap, no watermark. Resize as many videos as you like.

Every major platform

TikTok, Reels, Shorts, YouTube, LinkedIn, Pinterest, Twitter/X. All covered.

One-click download

Get a clean MP4 for each format, ready to upload straight to your feed.

FAQ

Video Resizer FAQ

Everything you need to know about resizing video for social media.

Don't find your answer? Let's chat.

More Tools

Related Free Tools

Explore more AI-powered tools to supercharge your ad workflow.

AI Ad Resizer

Resize image ad creatives to every format with AI that recomposes the layout, not just crops.

AI Ad Script Generator

Paste a product URL and get a complete AI ad script with hook, scenes, and CTA. Free and instant.

AI Avatar Library

Browse hundreds of hyper-realistic AI avatars. Filter by style, copy prompts, and use them in your video ads.

Testimonials

Trusted by creators worldwide

See what our users have to say about Reloop and how it transformed their content creation workflow.

It completely changed how we run SaaS ads. We capture attention instantly and boost engagement.

Lucas Gonzales

CEO, Vizion

We ship social content daily without a studio. It saved us time, money, and tons of effort.

Olivier Mounié

Head of Ojetables

Our social presence leveled up. We create impactful content fast and stay top of mind.

Alexandre Derocq

Founder, Casanea

Ad creation became effortless. Editing, subtitles, storytelling – everything feels smooth now.

Clément Carrere

Director, Easy Virtual Tour

We launch promos and micro-lessons in minutes. It accelerated our course sales.

Freddy Janssens

Founder, Formation.Academy

I tested Reloop and the results were impressive. Excited to see how far we can push it.

Juliette Charpentier

Head of Acquisition, Nooz Optique