Why designs break during conversion at all
Most design breakage happens because something in the original page depends on its exact hosting context: relative asset paths that assume a specific folder structure, JavaScript that queries a specific DOM structure WordPress alters, or web fonts loaded from a domain-restricted CDN. When a conversion process does not account for these, elements shift, fonts fall back to system defaults, or animations stop firing.
A second common cause is WordPress itself injecting its own markup, such as wp_head() and wp_footer() hooks pulling in plugin scripts and styles that were never part of the original design, occasionally conflicting with the imported CSS if class names collide.
What a faithful conversion preserves
A conversion that avoids breaking the design captures the fully rendered page, meaning the CSS as computed after JavaScript runs, not just the raw source HTML, and rewrites asset paths so images and fonts resolve correctly inside /wp-content/themes/your-theme/assets/. It also keeps animation and interaction scripts intact rather than stripping them for simplicity.
Themify captures the rendered page locally in the browser and packages CSS, JavaScript and image assets together with corrected paths into the theme's asset folder, which is specifically why animations and interactive elements tend to survive the process rather than being flattened into static markup.
Common breakage points and their causes
Certain elements break more often than others during any kind of site migration, automated or manual. Custom web fonts loaded via @font-face rules with restrictive domain licensing can silently fall back to Arial if the font files or license do not travel with the conversion. Scroll-triggered animations built on JavaScript libraries can stop firing if the library script is not correctly enqueued.
Responsive breakpoints occasionally shift if a conversion tool captures only the desktop viewport and does not account for mobile-specific CSS. Background images referenced via inline styles rather than external stylesheets are another frequent miss for less thorough conversion methods.
- Web fonts falling back to system fonts due to missing files or path errors
- Scroll or hover animations not firing because a script was not enqueued
- Mobile layout shifting because only the desktop viewport was captured
- Background images referenced inline being missed by asset extraction
How to verify nothing broke after conversion
Before pointing a live domain at the new WordPress install, test the converted theme on a staging URL across desktop and mobile viewports, checking each interactive element specifically rather than just scanning the page. Open browser devtools and check the console for 404 errors on assets, which quickly reveal any broken image or font paths.
Compare the converted page side by side with the original using a tool like a split-screen browser window or a visual diff extension, paying particular attention to spacing, font rendering and any hover or scroll effects.
- Install the converted theme on a staging site, not the live domain
- Check the browser console for 404s on CSS, JS, font or image files
- Test every interactive element: menus, hover states, scroll animations, forms
- Compare desktop and mobile side by side against the original page
- Fix any discrepancy in functions.php or the theme's CSS file before going live
When manual rebuilds are riskier than automated capture
A manual rebuild introduces human interpretation at every step: a developer estimating a spacing value, approximating a color, or skipping an animation deemed low priority under time pressure. Each of these small decisions compounds into a final result that is close to but not identical to the original.
An automated capture that reads the actual rendered CSS avoids this interpretation gap by construction, though it still requires the verification pass above to catch edge cases like domain-restricted assets that no tool can copy without permission.
Fixing issues without starting over
If something does break, it rarely means restarting the whole conversion. A missing font can be re-uploaded to the theme's assets folder and referenced correctly in style.css. A misfiring script usually just needs its wp_enqueue_script call added or corrected in functions.php. Treat post-conversion QA as a normal, expected step rather than a sign the process failed.
Frequently asked questions
- Does WordPress itself alter my CSS?
- No, WordPress does not alter your theme's CSS; any changes you see come from plugin styles being added alongside it or from the conversion process itself, not from WordPress core.
- Can animations survive a conversion to WordPress?
- Yes, if the conversion tool captures and correctly enqueues the JavaScript responsible for the animation rather than stripping it, animations typically continue working exactly as before.
- Why do fonts sometimes look different after conversion?
- Fonts often change appearance if the actual font files were not copied over or if a licensing restriction prevents the font from being served from the new domain, causing a fallback font to render instead.
- Should I test on staging before going live?
- Yes, always test a converted theme on a staging URL first so any layout or asset issue can be fixed before it affects real visitors or search engine crawlers.
- Is a broken design after conversion a WordPress limitation?
- It is almost always a conversion process limitation rather than a WordPress limitation, since WordPress will faithfully render whatever valid HTML, CSS and JS the theme files contain.