Why Hyphens Keep Coming Up in SEO Conversations

Few punctuation marks get as much SEO attention as the humble hyphen. It shows up in URLs, image file names, page titles, headings and brand names, and every one of those placements raises the same question: does Google actually care? The answer is that hyphens matter in some places for very specific technical reasons, matter mildly in others as a readability signal, and matter not at all in a few places where people obsess over them anyway. Understanding the difference stops you from wasting time on cosmetic edits while ignoring the changes that genuinely affect how search engines parse your pages.

How We Help: SEO Services From AAMAX.CO

Questions like this are exactly why URL structure reviews are part of every technical audit we run at AAMAX.CO. We are a full service digital marketing company delivering web development, digital marketing and search engine optimization to clients worldwide, and our team handles the unglamorous but high-impact work: normalising slug patterns, mapping redirects so nothing loses equity, cleaning up asset file names, and rebuilding internal links after a migration. If your site has accumulated three different URL conventions over the years, we can consolidate them safely rather than risking traffic on a guessed rollout.

Hyphens in URLs: This Is Where It Genuinely Matters

Google's own documentation is unusually direct on this point: use hyphens to separate words in URLs, and avoid underscores. The reason is tokenisation. A search engine needs to break a URL string into individual words to understand what the page is about. A hyphen is treated as a word separator, so /blue-running-shoes is read as three distinct words. An underscore has historically been treated as a word joiner, so /blue_running_shoes risks being read as a single unrecognisable token. Words jammed together with no separator at all, like /bluerunningshoes, are the hardest case, because the engine has to guess where one word ends and the next begins.

None of this means an underscore URL cannot rank. Plenty of them do, especially when the rest of the page is strong. But you are adding friction for no benefit, and you are making your URLs harder for humans to read and share. Since the URL is often displayed in search results, in social previews and in link text, clarity has a real click-through benefit on top of the parsing benefit.

How Many Hyphens Are Too Many?

There is no fixed limit, but there is a practical one. A slug like /best-cheap-affordable-budget-running-shoes-for-men-2026-guide is not penalised for its hyphens; it is weakened by the keyword stuffing those hyphens are joining together. Aim for three to five meaningful words. Drop stop words when they do not aid comprehension, keep the primary topic near the front, and resist the urge to cram every variation into the path. A short, descriptive, lowercase, hyphenated slug is the modern standard for a reason.

Hyphens in Titles, Headings and Meta Descriptions

Here the hyphen is purely a formatting choice. Google parses natural language in titles and headings, so whether you write "Running Shoes - Buyer's Guide", "Running Shoes | Buyer's Guide" or "Running Shoes: Buyer's Guide" makes no meaningful ranking difference. What does matter is how the separator affects readability and truncation in the search results. Pipes tend to look cleaner for brand suffixes, colons read better for subtitles, and long dashes can be visually confusing on narrow mobile screens. Choose one convention, apply it site-wide for consistency, and spend your energy on the words rather than the punctuation between them.

Hyphens in Domain Names

Hyphenated domains are the one place where a mild negative applies, and it is not algorithmic. Google does not penalise a hyphen in a domain, but hyphenated domains are harder to say aloud, easier to mistype, historically associated with low-quality exact-match domain spam, and weaker for brand recall. If you are choosing a new domain, a clean brandable name almost always beats keyword-with-hyphens. If you already own a hyphenated domain and it has years of authority and links behind it, changing it is rarely worth the migration risk unless you have other strong reasons.

Hyphens in Image and File Names

Image file names are a small but real ranking factor for image search, and the same tokenisation logic applies. A file named leather-office-chair-side-view.jpg gives Google usable context. A file named IMG_4837.jpg or leather_office_chair.jpg gives it very little. Combine hyphenated descriptive file names with accurate alt text and relevant surrounding copy, and your images become an additional discovery channel rather than dead weight.

Compound Words, Brand Names and Search Intent

Modern search engines handle compound-word variation well. Users searching "e-commerce", "ecommerce" and "e commerce" are shown broadly similar results because Google understands these as the same concept. The practical advice is to pick the spelling your audience actually uses most, use it consistently in your content, and mention the alternate form naturally once or twice where it fits. Do not create separate pages for each hyphenation variant, because you will simply compete against yourself and split your own signals.

Changing Existing URLs Without Losing Rankings

If you decide to standardise on hyphens, treat it as a migration rather than a quick edit. Inventory every URL you plan to change, map each old URL to exactly one new URL, implement permanent 301 redirects, update every internal link to point directly at the new destination rather than through a redirect chain, refresh your sitemap, and monitor coverage and rankings in Search Console for several weeks afterwards. Avoid changing high-performing URLs purely to swap an underscore for a hyphen; the theoretical gain rarely justifies the disruption unless you are already restructuring that section.

The Practical Takeaway

Use hyphens in URLs and file names, keep slugs short and descriptive, stay consistent with title separators, avoid hyphens in new domains, and never restructure live URLs without a redirect plan. These are small hygiene decisions, and on their own they will not outrank a competitor with better content and stronger authority. What they will do is remove ambiguity, which is exactly what you want when a search engine is trying to understand your site.

If you would rather have those decisions handled as part of a wider strategy that also covers content, authority building and GEO services for AI-driven search surfaces, our team is ready to take it on end to end.