Guides
Guides for YouTube Thumbnails and Uploads
In-depth, dated guides checked against YouTube's own help pages. No invented statistics, just what YouTube says and what we've tested.
How to Write YouTube Descriptions That Help Viewers
How to write a clear YouTube description: what goes in the first lines, a reusable layout, the 5,000-character and hashtag rules, and a pre-publish checklist.
Using YouTube Thumbnails Legally: A Cautious Guide
Who owns a YouTube thumbnail, what YouTube's Terms say, how UK fair dealing and US fair use work, and safer ways to show a video. Plain English, not legal advice.
Why maxresdefault.jpg Is Missing for Some YouTube Videos
Why YouTube's maxresdefault.jpg thumbnail returns a 120×90 grey placeholder for some videos, how to detect it in code, and the best fallback sizes to use.
YouTube Chapters and Timestamps: How to Make Them Work
How to add YouTube video chapters with timestamps: the 0:00, three-chapter, ascending order and 10-second rules, automatic chapters, examples and troubleshooting.
YouTube Shorts Thumbnails: What You Can Control
How YouTube Shorts thumbnails work in 2026: 9:16 at 2160×3840, uploading custom Shorts thumbnails in YouTube Studio, the 4:5 crop, and design tips that survive cropping.
YouTube Thumbnail Design Tips: Clear, Honest and Readable
Practical YouTube thumbnail design tips: design for small screens, one clear focal point, readable text, the timestamp corner, honest promises, and testing with YouTube's A/B tool.
YouTube Thumbnail Sizes and Resolutions Explained
YouTube's current custom thumbnail specs (3840×2160 recommended, 640px minimum width, 16:9, file limits) and the five image sizes YouTube serves for every video.
How we write these guides
Each guide states where its facts come from. Usually that's a named YouTube Help page, the UK Intellectual Property Office or the relevant law, together with the date we checked. Where we've tested something ourselves, such as which thumbnail sizes YouTube's image server returns, we say so and give the date. YouTube changes its features and limits often, so every guide shows a "Last updated" date. We aim to review them whenever YouTube's documentation changes. If you spot something out of date, please let us know.