How to Create Clean URL Slugs and Compare Two Texts Line by Line
Learn the exact rules the slug generator applies to a title, how the line-by-line compare flags differences, and where each mode falls short.
Text Compare & Slug Generator
Introduction
A URL slug is the readable part of a web address, and inconsistent capitalisation, spaces or punctuation in slugs lead to duplicate URLs and broken links. Spotting what changed between two drafts of a config file or paragraph is a separate but equally common chore. The Text Compare & Slug Generator covers both tasks in two tabs, with all processing done in the browser.
Step-by-Step Instructions
- Open the URL Slug Generator tab, which is selected by default.
- Type or paste a headline into Enter Article Title or Text; the Generated SEO URL Slug updates instantly.
- Click Copy Slug to copy the lowercase, hyphenated result.
- Switch to Line-by-Line Text Compare and paste the two versions into Original Text (A) and Modified Text (B).
- Read the Line Comparison Results list, where matching lines are marked with a tick and changed lines show both versions side by side.
Key Use Cases
- Blog permalinks: Turn a headline with punctuation and mixed case into a consistent slug before publishing.
- Config review: Paste two versions of an .env or settings file to see which lines were edited.
- Copy proofing: Check whether a revised paragraph differs from the approved one.
Frequently Asked Questions
What transformations does the slug generator apply?
It lowercases the text, trims it, removes every character that is not a letter, digit, underscore, space or hyphen, converts any run of spaces, underscores or hyphens into a single hyphen, and strips hyphens from both ends. The example title becomes how-to-calculate-loan-emis-and-save-interest-in-2026.
How are accented or non-Latin characters handled?
They are removed rather than transliterated, because the character filter only keeps ASCII word characters. A word like cafe with an accented e loses that letter, so check slugs for non-English titles and adjust by hand.
How does the compare mode decide what is different?
It splits both texts on line breaks and compares line 1 with line 1, line 2 with line 2 and so on, using exact string equality. It does not realign text when a line is inserted or deleted, and it does not highlight individual words within a line, so a single inserted line will mark every following line as different.