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One free scan finds every outdated or missing driver and matches the right update for your exact hardware.Free scan · exact hardware matchThere is no universal pixel size for a website header logo. Choose dimensions from your header’s usable space and the logo’s aspect ratio, then check that the result remains legible at the smallest responsive layout. A logo should fit without stretching, crowding navigation, or becoming blurry.
How to determine your logo’s dimensions
Start with the header as it is actually built—not an arbitrary logo-size rule. Navigation links, menu buttons, padding, and other controls all compete for space. A logo that looks balanced in a design file may become cramped once those elements appear, especially on mobile.
- Measure usable header height. Account for the space left after vertical padding and controls are in place. The logo’s rendered height should leave breathing room rather than touch the header’s edges.
- Check the full lockup. Test the symbol and wordmark together. If the text becomes too small to read or the lockup crowds navigation, consider a compact mobile version or a symbol-only mark.
- Keep the original proportions. Preserve the logo’s aspect ratio. Do not force a wide logo into a square container or stretch it to fill a fixed-width and fixed-height box.
- Test every responsive breakpoint. Confirm that the logo fits beside the navigation at the narrowest layout, then check its visual balance on larger screens.
- Check contrast, whitespace, and interaction. Make sure the mark stands out against its background, has appropriate space around it, and remains easy to use as a homepage link.
The right dimensions are the smallest rendered size that keeps the logo legible and visually balanced across those layouts. The source image can be larger than its displayed CSS size; what matters is how it renders in the page and whether the format holds up at the display density.
Why published logo dimensions vary
Published design-system sizes are useful starting points, not universal rules. They reflect particular headers, brand assets, and platform requirements. For example, the National Cancer Institute specifies a standard header logo of 385×85 pixels and responsive variants of 597×50 pixels for desktop and 288×38 pixels for mobile. These differing dimensions illustrate why one fixed ratio or size cannot serve every header.
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Other systems set different constraints. Microsoft SharePoint recommends 192×64 pixels for a site logo, 64×64 pixels for a square thumbnail, and 300×64 pixels for an extended-layout logo. The UAE Design System says logo height should generally not exceed 110 pixels and provides separate desktop and mobile headers. GOV.GR gives examples of 50-pixel logo height on large screens and 40 pixels on small screens, while requiring that proportions be maintained.
Use these figures only when designing for the named system or as examples to compare against your own layout. SharePoint’s upload recommendations, for instance, do not establish the right dimensions for a custom website header.
Desktop and mobile: one logo or separate versions?
You can use one asset at multiple sizes if it remains readable and fits the available space. But a long wordmark may become illegible when reduced, and a desktop navigation layout may provide room that a mobile header does not. In that case, use a compact lockup or symbol-only variant on narrow screens rather than shrinking the entire desktop version until its text disappears.
California Web Standards advises that text in a header logo remain legible and notes that a web-optimized logo may be needed. It also points to separating visual elements from text when necessary. If you replace the full lockup with a symbol on mobile, ensure the site name still has a suitable accessible name; do not assume the symbol alone communicates the brand to every visitor.
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SVG, PNG, or another image format?
SVG for a logo that supports it
Prefer SVG when your logo is available in a clean, suitable vector version and your publishing platform accepts it. SVG scales without the blur or pixelation associated with enlarging a raster image. The National Cancer Institute says its logo should be SVG, and the UAE Design System also recommends SVG. GOV.UK guidance notes that SVG has no minimum image size. SVG is a normal image source in HTML, but platform upload rules or security restrictions may prevent its use in some systems.
Raster files when SVG is unavailable
If your platform cannot use SVG, export a raster fallback at the largest display density you need, then verify it at its actual CSS size. PNG is a common choice when you need transparency; the best format depends on the asset and the platform’s supported formats. Microsoft SharePoint accepts PNG, JPEG, and SVG subject to platform restrictions. Do not enlarge a small raster logo to fill a larger header: that is a common cause of blur.
Do not confuse file dimensions with rendered dimensions
A 600-pixel-wide file can be displayed at a smaller CSS width, but that does not mean the header logo should render at 600 pixels. Design the rendered size around the header, preserve the file’s proportions, and use a sufficiently detailed raster source if you need a raster fallback. If the logo looks stretched, check the CSS or upload settings for conflicting width and height values; use one dimension with automatic proportional scaling where possible.
Implementation and accessibility checks
A header logo commonly links to the homepage. The National Cancer Institute requires its logo to link home, and Defra requires logo links to be keyboard-usable. Make sure the link can receive keyboard focus and that its purpose is clear to assistive technology.
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- If the logo image itself identifies the site, provide an appropriate accessible name for the homepage link.
- If nearby visible text already names the site and the image is decorative, use an empty alternative for that image and keep the text in the document.
- Check focus visibility and keyboard operation, not just the visual appearance of the logo.
- Check contrast against the header background. Defra specifies WCAG 2.2 AA contrast for text and interactive elements.
- Test zoom and the narrowest responsive layout to catch cropping, overlap, or unreadable text.
Do not add the same brand name twice to a screen reader’s output. Choose the image alternative and link name according to the surrounding content, and verify the result with the page’s actual markup.
How to verify the logo in a live header
- Load the published page at the smallest supported viewport and inspect the logo beside the real navigation controls.
- Repeat at desktop widths, checking that the logo has not become disproportionately large or left too little room for navigation.
- Inspect the logo’s rendered CSS dimensions and compare them with the asset’s aspect ratio. If it is distorted, correct the sizing rule rather than editing the artwork into the wrong proportions.
- Check a high-density display or zoomed page for raster blur. If the source is a small raster, replace it with a larger export or an accepted SVG.
- Use the keyboard to reach and activate the homepage link, and inspect its accessible name with assistive technology.
For repeatable visual checks across viewport sizes, capture the page at the dimensions you need and compare the header rendering. ScreenshotNeo is a website screenshot API and MCP server; its custom viewport options can help capture those states. It does not determine the right logo dimensions for you—the layout and legibility checks above do.
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Make a one-call capture of a page to inspect the published header. Replace the example URL with your page URL; the API accepts PNG, JPEG, or WebP output, or a PDF. See the ScreenshotNeo documentation for request options.
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Troubleshooting common logo problems
The logo looks blurry
Check whether the asset is a small raster file being enlarged. Export a higher-resolution raster version for the largest display density you need, or use SVG if your platform accepts it. Recheck the logo at its actual rendered CSS size.
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The logo looks stretched or cropped
Look for fixed width and height settings that do not match the original aspect ratio, or a container that clips overflow. Preserve the source proportions and adjust the container or rendered size to fit the artwork.
The wordmark is unreadable on mobile
Do not keep reducing the full desktop lockup after the text becomes illegible. Use a compact or symbol-only mobile treatment, and ensure the site name remains available as visible or accessible text.
The logo collides with navigation
Reassess the usable width after navigation controls and padding are accounted for. Reduce the lockup’s rendered size only while it remains legible; otherwise use a more compact variant or adapt the responsive header layout.
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Check that the file type is allowed in that platform and whether it has specific logo slots or dimensions. SharePoint’s documented formats are PNG, JPEG, and SVG, subject to its restrictions; that allowance should not be assumed for other systems. If SVG is not supported, provide a raster fallback.
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Choosing the final size
Compare candidate versions by wordmark legibility, header-height fit, space left beside navigation, desktop-to-mobile behavior, scaling quality, accessibility, and any platform upload limits. Choose the smallest rendered size that passes those checks at the narrowest layout and still looks balanced on larger screens. Treat platform-specific pixel recommendations as constraints for that platform—not as a general web standard.
Frequently Asked Questions
Should my website header logo be a fixed number of pixels wide?
No. Set its rendered width from the header’s available space and the logo’s aspect ratio; the usable space changes with the layout and breakpoint.
Can a logo image contain the site name and still need alt text?
Yes. The homepage link still needs an appropriate accessible name. If nearby visible text already identifies the site, the image may instead be decorative with an empty alternative.
Does a larger source image automatically make a logo look better?
No. The rendered dimensions must fit the header, and the source must preserve its proportions and provide enough detail for the display density. A needlessly large rendered logo can crowd navigation.
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