Guides · 16 articles
Video sizes and formats
The sizes, aspect ratios, lengths and safe zones each platform expects, and how to design a video that fits them.
YouTube Shorts Size, Resolution and Aspect Ratio
For a YouTube Short that fills a phone screen, export a vertical video at a 9:16 aspect ratio, which compares the video’s width with its height.
3 min readHow Long Can a YouTube Short Be?
A YouTube Short is a vertical or square short-form video on YouTube. YouTube allows Shorts uploaded after October 15, 2024, to run up to three minutes long.
2 min readTikTok Video Size, Resolution and Aspect Ratio
The aspect ratio compares a video’s width with its height. This frame fills a phone screen in the For You feed.
4 min readTikTok Safe Zone: Where to Keep Text and Faces
When you make a vertical TikTok video, interface elements such as the like and share buttons, captions, and progress bar cover parts of the picture.
3 min readInstagram Reels Size, Resolution and Aspect Ratio
For a full-screen vertical Instagram Reel, use a 9:16 aspect ratio. Resolution counts the pixels in an image; aspect ratio compares its width with its height.
3 min readInstagram Reels Safe Zone: Keeping Text Clear of the Buttons
Instagram’s buttons and labels can cover titles, captions, and logos in a Reel. A safe zone is the part of the video frame where buttons and labels do not…
3 min readInstagram Video Sizes for Feed, Reels and Stories
For Instagram video, use 1080 × 1920 pixels for full-screen Reels and Stories, and choose a feed shape based on how much vertical space you want: 1080 ×…
3 min readLinkedIn Video Size, Length and Format
When you prepare a LinkedIn video, choose dimensions, a file type, and a duration that fit the post so it uploads and displays as intended.
3 min readFacebook Video Size and Aspect Ratio
When you upload a video to Facebook, its aspect ratio, the relationship between its width and height, helps determine how it fits in a Feed, Reel, or Story.
4 min readX (Twitter) Video Size, Length and Format
Choose a landscape, portrait, or square frame based on how people will watch it. The specifications below help you choose a layout and check the duration…
3 min readYouTube Thumbnail Size and Best Practices
A YouTube thumbnail is the preview image viewers see before they open a video. Its dimensions affect how sharp it looks, and its design helps viewers…
4 min readVideo Aspect Ratios Explained: 16:9, 9:16, 4:5 and 1:1
A video's aspect ratio determines how much screen space it fills on YouTube, in a phone feed, or in a social post, and what remains visible.
3 min readVertical Video: When to Use 9:16 and How to Design for It
If you’re making a video for people scrolling on a phone, the frame’s shape determines how much of the screen your message fills and what viewers can see.
3 min readHow to Make a YouTube Short That Explains Something
A teaching Short should help a first-time viewer understand one idea before it ends. Choose one clear question, answer it early, and use visuals to show how…
4 min readBest Export Settings for YouTube
Your export settings determine the video file you upload to YouTube. YouTube processes the file for playback on different devices, so a clean export gives…
4 min readHow to Make a Video for YouTube with an AI Agent
To make a YouTube video with an AI agent, give the software a goal and let it handle linked tasks such as writing narration and creating visuals.
3 min readVideos made with explainroo
A coding agent made each of these with explainroo, from the script to the finished MP4.
- LinkedIn 4:5
- 1.2x pace
- Paper look
How to run a 15-minute stand-up
How to keep a daily stand-up to fifteen minutes: what each person says, where longer talks go, and why it starts and ends on time.
- Shorts 9:16
- 1.2x pace
- Clean look
Why phone batteries wear out
Why every charge wears a phone battery a little, and how heat and long hours at full charge speed that up.
Free and open source
Make your own with your AI agent
explainroo lets a coding agent like Claude Code or Codex make narrated explainer videos and product demos. The voice, the word timing and the rendering run on your own computer, with no API key and no cost per video.
Copy this into your AI agent
Make me a 30 second vertical explainer video for TikTok about [your topic]. Use explainroo for it: clone https://github.com/vincentsch/explainroo, read its AGENTS.md and follow the steps.
Made with explainroo: Why phone batteries wear out