Image Dimension Checker
Score whether images set width and height — not a ranking trick, just layout-shift hygiene.
What this tool gives you
Check image width and height
Fetch a public page or paste HTML. The checker scores reserved space — not a ranking trick.
What this checker looks for
Width and height attributes reserve layout space before the file loads. That cuts CLS.
Both attributes
Every <img> needs width and height, not just one.
Numeric pixels
Use 1200 and 675, not 100% or auto.
HTML first
Attributes beat style="width:…" because they apply before CSS.
src still required
Dimensions cannot reserve a file that is not referenced.
Aspect ratio
Matching intrinsic size keeps the box from stretching.
Not a ranking lever
This is Core Web Vitals hygiene, not a citation trick.
How to use the checker
Fix alt text first, then width and height, then share cards.
Check the live page
Fetch the public URL or paste the HTML from view-source.
Set both attributes
Every <img> needs width and height so the browser can reserve space.
Use pixel numbers
Match the intrinsic size. CSS can still shrink with max-width:100%.
What healthy image dimensions usually include
Both attributes. Positive pixels. No CSS-only sizing as the only reserve.
| Part | Job | Default for public sites |
|---|---|---|
| width | Reserve horizontal space | positive pixel number |
| height | Reserve vertical space | positive pixel number matching aspect |
| Both attributes | Know aspect ratio early | never only width or only height |
| Numeric values | Avoid 100% / auto | 1200 and 675, not 100% |
| HTML vs CSS | Apply before stylesheet | attributes, then CSS max-width |
| src | Point at a real file | src present |
Related GEO pages
Fix alt, then width/height, then Open Graph.
Image Srcset Checker
Score srcset, sizes, width descriptors and src fallback.
Image Loading Checker
Score eager LCP, lazy galleries, fetchpriority and decoding.
Image Alt Checker
Score image alt coverage, useful descriptions, decorative empty alt and src.
H1 Checker
Score one visible h1, heading length, title overlap and outline order.
Favicon Checker
Score rel=icon href, type, sizes and apple-touch-icon tab-icon hygiene.
Viewport Meta Checker
Score width=device-width, initial-scale=1 and pinch-zoom hygiene.
Open Graph Checker
Score og:title, og:description, HTTPS og:image and matching og:url.
Title and Meta Description Checker
Score unique title, meta description length and matching og:* copy.
GEO Visibility Checklist
Score citation-ready content, entity clarity and weekly mention tracking.
Tools Lab
More generators, calculators and GEO workflows.
Image dimension FAQs
Does setting width and height make ChatGPT cite my page?
No. Dimensions stop layout shift when the file loads. Citations still depend on crawl access, answer-ready content and corroboration.
Can I use width="100%" instead of pixels?
No. Browsers need a numeric aspect ratio. Use the intrinsic pixel size, then CSS max-width:100% to shrink it.
Is CSS width/height enough?
Attributes apply before CSS. style="width:1200px" still lets the box jump if the stylesheet is late.