Here's what happened, what I got wrong, and how I fixed it.

The Problem: URLs Way Longer Than They Should Be

My permalink structure was set to:

/%category%/%postname%/

Which seemed fine — until I actually looked at the resulting URLs:

techfocus360.com/blogs/artificial-intelligence-machine-learning/future-of-artificial-intelligence/

That's 106 characters. For comparison, the actual post slug (future-of-artificial-intelligence) is only 35 characters. The rest — 71 characters — was just the category name being dumped straight into the URL.

Multiply that across every category (some names were even longer, like software-development-coding-dev-tools), and every single one of my 100 posts had unnecessarily bloated URLs. Not a catastrophe, but not good either — long, keyword-stuffed URLs are a minor but real negative signal, and they're just ugly to share.

My First Fix Was Wrong

My first instinct: just remove %category% from the structure entirely.

/blogs/%postname%/

Clean, short, simple. I changed it and moved on.

Big mistake. Within minutes:

• All my tool pages (also organised as WordPress categories, not a separate post type — I didn't realise this mattered) started 404ing

• Category archive pages broke

• Breadcrumbs started rendering nonsense like Home > Blogs > Blogs > [Category]

The lesson here: if your permalink structure change affects %category%, it affects every content type that uses categories — not just the content type you're thinking about. I was only thinking about blog posts. WordPress didn't care what I was thinking about.

I reverted immediately.

The Actual Fix: Shorten the Category Slug, Not the Structure

Once I reverted, the real fix was much smaller in scope than I'd assumed. WordPress separates a category's display name from its URL slug — you can change one without touching the other.

So instead of touching the permalink structure at all, I just edited each category's slug:

Same structure (/%category%/%postname%/), same tool pages, same breadcrumbs — just a shorter piece plugged into the same template. URLs dropped from 100+ characters down to under 60. Nothing else broke.

The Part I Didn't See Coming

Here's the thing nobody warns you about: changing a category slug doesn't just change future URLs — it silently breaks every link that was already hardcoded with the old slug.

And it turns out, a lot of my posts linked to each other. Internal linking between related posts is good practice — I'd been doing it consistently across the site, similar to what I write about in my guide to internal linking strategy. Which meant every one of those links had the old, long category slug baked into the <a href>, written at the time the post was created.

Once I shortened the slugs, every one of those internal links pointed to a URL that no longer existed.

I found this the hard way — while auditing internal links post by post, nearly every article had at least one link like this:

/blogs/software-development-coding-dev-tools/choosing-a-programming-language/

...pointing to a category slug that had been renamed to dev-tools weeks earlier. Multiply that by 100 posts, and you get a lot of quietly broken internal links — the kind that don't show up unless you're specifically checking, but that steadily erode both user experience and internal link equity.

Two Ways to Fix This (Pick Based on Your Situation)

1. Redirects (fast, non-destructive)

Set up a redirect rule per old category slug:

Source (contains): /blogs/artificial-intelligence-machine-learning/ Destination: /blogs/ai-ml/

This catches everything — old links, bookmarks, anything Google already indexed — without touching your actual content. Downside: you're now running an extra redirect hop on every one of those links, forever, unless you also fix the source.

1. Direct database search-and-replace (permanent)

Using a tool like Better Search Replace (a WordPress plugin), you can search your wp_posts table for the old slug fragment and replace it with the new one, across every post, in one operation — always dry-run first before committing.

I ended up doing a mix of both: redirects for immediate safety, and manually fixing the internal links in each post over time as I was already reviewing that content for other reasons — the same process I now use as part of a full technical SEO audit for client sites.

The Takeaway

If your site organises any content type by category — posts, tools, products, whatever — and you're tempted to "clean up" your URL structure, separate these two questions before you touch anything:

Is the permalink structure the actual problem, or is it just one specific slug that's too long? What content types (not just the one you're focused on) share that same category taxonomy?

In my case, the fix that actually worked was smaller and safer than the fix I tried first. And the invisible cost — broken internal links across 100 posts — was bigger than the problem I was originally trying to solve.

Cheap lesson, in hindsight. Could have been a much more expensive one on a bigger site.

I write about SEO, site architecture, and the practical (sometimes messy) side of running a small SaaS-focused agency at TechFocus360. If you've hit a similar "small change, big blast radius" moment, I'd like to hear about it in the comments.