UTM Audit & Linter
Paste a list of URLs with UTM parameters and find inconsistencies: casing, missing fields, duplicates, typos. Export a fixed CSV.
Paste a list of URLs with UTM parameters and find inconsistencies: casing, missing fields, duplicates, typos. Export a fixed CSV.
This free UTM Audit & Linter from KX Toolkit is part of our all-in-one online toolkit. It runs entirely in your browser, so your data never leaves your device for client-side operations. 100% free, forever - no paywall, no credit card, no trial.
How to use the UTM Audit & Linter
- Pick the platform you're posting to.
- Paste or write your copy.
- Run the tool - it shows the count, suggestions or formatted text.
- Copy the result and paste it into the platform composer.
What you can do with the UTM Audit & Linter
- Hit Twitter's 280-character limit while keeping links intact.
- Generate relevant hashtags for Instagram and TikTok.
- Turn plain text into Unicode bold/italic for LinkedIn posts.
- Find the right caption length for each platform.
Why use KX Toolkit's UTM Audit & Linter
- Browser-based: Works on Windows, macOS, Linux, iOS and Android - no install, no extension.
- Privacy-first: Client-side tools never upload your data; server-side tools delete files right after processing.
- Mobile-friendly: Full feature parity on phones and tablets - not a stripped-down view.
- Fast: Optimised for instant feedback. No artificial waiting screens, no email-gated downloads.
- One hub for everything: 300+ tools across SEO, text, image, PDF, code, color, calculators and more - skip switching between sites.
Tips for the best results
Schedule batches of posts using the character counter side-by-side with your scheduling tool - saves a lot of editing later.
Related Social Media Tools
If you find this tool useful, explore the full Social Media Tools collection or browse our complete tool directory. KX Toolkit is built for marketers, developers, designers, students and anyone who needs a quick utility without signing up for yet another SaaS.
What does the UTM linter check for?
It validates each URL against several common mistakes: missing utm_source or utm_medium (the two required fields per Google's spec), inconsistent casing of the same value (Facebook vs facebook), known typos (newsleter, linkdin, twiter), duplicate URLs with the same UTM combo, leading or trailing whitespace, and invalid URLs that do not parse. Each row shows a status of OK, warning, or error along with the specific issues found.
Why does casing matter for UTM parameters?
Google Analytics and most other analytics tools treat utm_source values as case-sensitive strings. That means "Facebook" and "facebook" become two separate rows in your reports, splitting your traffic and breaking comparisons. Standardize on lowercase across your entire team. The linter flags any value that appears with multiple casings so you can pick one and fix the rest.
Are my URLs sent to a server?
No. All parsing and linting happens in your browser using the standard URL constructor. The URLs never leave your machine, which is important because UTM parameters can leak campaign names, internal codenames, and pre-launch product names. You can paste a thousand URLs from a private spreadsheet and the page processes them locally without any network request.
What is the "Download fixed CSV" doing?
It outputs every row with both the original URL and a normalized version that lowercases every UTM value and corrects known typos. This gives you a clean replacement file that you can paste back into your campaign spreadsheet, link shortener, or attribution tool. The CSV also includes a status column and a list of issues so you can audit the changes before applying them.
How does it detect duplicates?
A duplicate is defined as the same hostname plus path plus the same set of UTM values, ignoring other query parameters. So example.com/page?utm_source=fb&utm_medium=cpc and example.com/page?utm_source=fb&utm_medium=cpc&extra=1 are considered duplicates because their UTMs match. The first occurrence is kept; subsequent rows are flagged with the line number of the original.
How many URLs can I check at once?
The tool processes up to 1000 URLs per audit. That is enough for most campaign spreadsheets and quarterly reviews. If you have more, split the list into batches. Performance is fast because everything runs locally and there are no API limits, no rate limits, and no per-URL cost. The summary panel updates instantly with counts of clean, warning, and error rows.
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