Correct image dimensions for every platform and post type, plus a compare-your-image checker
Free, runs entirely in your browser — no sign-up, no file upload to a server.
What does the Image Size Guide do?
It lists the correct image dimensions for every major platform and post type, and includes a checker where you can upload your own image to see how it compares against the recommended size.
Where is my uploaded image processed?
Entirely in your browser — it's only used locally to compare dimensions, never uploaded.
How do I report a problem or request a feature for this tool?
Use the Contact / Feedback page — select "Image Size Guide" as the related tool so we know exactly which tool you mean, then describe the bug or the feature you'd like to see.