Thumbnail Size Guide Online - Free Social Media Image Dimensions Tool

Thumbnail Size Guide Tool

Find recommended thumbnail and image sizes for YouTube, Instagram, TikTok, Facebook, LinkedIn, X and other social platforms.

🖼️ Size guide

Platform image requirements can change. Use this as a practical guide, then confirm inside the platform when uploading important content.

Choose Platform & Format

Platform

Format Type

Priority

Custom Width

Custom Height

File Type

Design Notes

0 Sizes Found

16:9 Custom Ratio

921,600 Total Pixels

- Closest Match

Selected Size Preview

1280 × 720
16:9

Platform YouTube

Format Thumbnail

Dimensions 1280 × 720

Aspect Ratio 16:9

Recommended Type JPG / PNG

Use Case Video thumbnail

Recommended Sizes

No size selected yet

Click Find Sizes to view thumbnail and image dimensions.

Copyable Size Guide Report

About This Tool

Thumbnail Size Guide is a free online social media tool that helps creators, designers, marketers and businesses choose the right image dimensions for thumbnails, posts, stories, reels, covers, ads and website previews.

You can select a platform such as YouTube, Instagram, TikTok, Facebook, LinkedIn, X, Pinterest or Website / Blog. The tool shows recommended sizes, aspect ratios, file type guidance, use cases, design notes and a visual preview.

It also includes a custom width and height checker that calculates aspect ratio, total pixels and closest matching platform format. You can copy a selected size, copy the full report or download the thumbnail size checklist.

This tool is useful for YouTubers, social media managers, designers, bloggers, content creators, freelancers, online businesses and anyone preparing platform-ready visuals.

How to Use Thumbnail Size Guide

1. Choose the platform such as YouTube, Instagram, TikTok, Facebook, LinkedIn or X.
2. Choose the format type such as thumbnail, post image, story, reel, cover or ad.
3. Select priority such as recommended, safe common size or mobile first.
4. Enter a custom width and height if you want to check your own design.
5. Click Find Sizes.
6. Review the recommended dimensions and aspect ratios.
7. Select any size to preview it.
8. Copy the selected size, copy the full report or download the guide.

Privacy Note: This Thumbnail Size Guide works directly in your browser using JavaScript. The custom width, height and design notes you enter are processed on the page and are not submitted through a form by this tool.

Frequently Asked Questions

Is this Thumbnail Size Guide free?

Yes. This Thumbnail Size Guide is free to use and does not require signup.

What size should I use for YouTube thumbnails?

The tool includes YouTube thumbnail options such as 3840 x 2160 for high-quality 16:9 thumbnails and 1280 x 720 as a common practical 16:9 creator size.

Can I check Instagram image sizes?

Yes. The tool includes Instagram square posts, portrait posts, 3:4 photos, Reels and Stories.

Can I check TikTok cover sizes?

Yes. The tool includes TikTok vertical 9:16, square 1:1 and horizontal 16:9 creative sizes.

Does this tool calculate aspect ratio?

Yes. Enter custom width and height and the tool calculates the aspect ratio, total pixels and closest matching platform size.