About Dual Media

Dual Media is an independent reference for content creators. We publish the exact specifications — sizes, dimensions, aspect ratios and length limits — for every major platform, alongside plain-English fix-it guides for the things that go wrong when you upload. The goal is simple: you should be able to find the right number in seconds and trust that it is correct.

Why we built it

Creator specs are scattered, inconsistent and often out of date. Platforms bury them in help centers, blogs copy each other’s stale figures, and the numbers change more often than anyone admits. We set out to be the opposite: one place where every spec is verified against the platform’s own documentation, shown with a dated Verified stamp, and re-checked as platforms evolve. When a figure isn’t officially published, we say so rather than inventing one.

How Dual Media is made

Every page is researched against primary sources — the platform’s own help or developer docs first, never another blog. Where sources genuinely conflict (video-length limits and AI-video tools are the worst for this), we explain the disagreement and tell you how to check your own account instead of asserting a single shaky number. Our in-browser tools run entirely on your device, so your files are never uploaded to us.

Independent, and not affiliated

Dual Media is not affiliated with, endorsed by or sponsored by any of the platforms we cover. We don’t publish paid or sponsored specs, and accuracy always comes before search rankings. If we get something wrong, we fix it and note the change.

Who it’s for

Editors, social media managers, YouTubers, streamers, designers and anyone who has ever exported a video only to watch a platform crop or blur it. If you make things for the internet, the specs here are the boring details that quietly decide whether your work looks the way you intended. Questions or corrections? See how we verify or get in touch.