Free online content marketing tools for people who create
Thirty seven checkers, generators, calculators and tests that run in your browser. No signup, no limits, and nothing you paste leaves your machine.
Writing and editing
Headline Analyzer
Score a headline on length, clarity, specificity and emotional pull
Readability Checker
Flesch Reading Ease, grade level, Gunning Fog and the sentences dragging your score down
Reading Time Calculator
Estimate reading and speaking time for any text, and copy a reading time badge
Passive Voice Checker
Find passive sentences in a draft and see how much of it is passive
Email Subject Line Tester
Check length, preview text, spam triggers and how a subject line truncates on mobile
Social Media Character Counter
Live counts against the limits and the ‘see more’ cut on every major platform
Filler Word and Wordy Phrase Finder
Highlight adverbs, hedges, fillers and wordy phrases, with shorter replacements
Sentence Length Checker
See the length of every sentence, the rhythm of the draft, and the ones to split
Word Counter
Words, characters, sentences, paragraphs, unique words and reading time
Banned Words Checker
Check a draft against your own list of banned words and jargon, with replacements
Repeated Phrase Finder
Find phrases and sentences that repeat across a draft, a common tell of AI generated text
Schema and SEO (Coming Soon!)
FAQ Schema Generator
Turn questions and answers into valid FAQPage JSON-LD
SERP Snippet Preview Tool
See how your title and meta description look in Google, with pixel widths
URL Slug Generator
Turn a headline into a clean, short, keyword focused URL slug
Open Graph Preview Tool
Preview how a link card will look on LinkedIn, X, Facebook and Slack
UTM Builder
Build tagged campaign links with consistent naming and a saved history
Keyword Density and Placement Checker
Count a keyword, see its density, and check it appears where it matters
Heading Structure Checker
Extract the H1 to H6 outline from HTML and flag skipped levels and multiple H1s
AI Crawler robots.txt Checker
See which AI bots your robots.txt allows or blocks, and whether you are blocking AI search by accident
Answer-First Checker for AI Search
Check whether a page answers its question in the first 60 words and is structured to be cited by AI assistants
Internal Link and Anchor Text Analyzer
List every link on a page, flag generic anchors, and separate internal from external
Image Alt Text Checker
List every image on a page with its alt text and flag the missing, empty and lazy ones
Planning and business (Coming Soon!)
Freelance Writing Rate Calculator
Work out the hourly, per word and per project rate you actually need to charge
Content Calendar Generator
Build a dated publishing schedule and export it as CSV or a calendar file
Content Brief Generator
Build a six part brief a writer can work from, and export it as Markdown or a document
Topic Cluster Planner
Map a pillar page and its spokes, draw the linking structure, and export the checklist
Content Decay Calculator
Paste a page’s monthly clicks and see whether it is declining, how fast, and what to do
Content ROI Calculator
Cost per piece, leads, customers, revenue and payback for a content programme
Content Repurposing Map Generator
Turn one article into a checklist of twelve derivative assets with an angle for each
Formatting and utilities (Coming Soon!)
Markdown to HTML Converter
Convert Markdown to clean HTML with a live preview, and HTML back to Markdown
Case Converter
Sentence case, Title Case, UPPER, lower, kebab-case, snake_case and camelCase
Text Diff and Before/After Comparison
Compare two versions of a text and see every word added, removed or changed
Placeholder Text Generator by Industry
Realistic placeholder copy for SaaS, fintech, healthcare, ecommerce and services mockups
Quote Image Maker
Turn a quote into a downloadable PNG for LinkedIn, X, Instagram or a blog
List Cleaner and Deduplicator
Trim, dedupe, sort, strip bullets and numbering, and fix the case of any pasted list
Learn and test (Coming Soon!)
Which Kind of Writer Do You Need? Quiz
Six questions that tell you whether your project needs a content writer, a copywriter or a UX writer
AI or Human? Spot the Unedited AI Draft
Eight pairs of paragraphs. Pick the one written by a person, then learn the tells
Why these tools exist
Every one of these started as a check we ran by hand for a client: does the snippet truncate, is the FAQ block valid, is the draft mostly passive voice, will the AI crawlers even see the page. Doing them by hand is slow and nobody else on the team learns anything. A tool that shows the answer instantly, and explains the rule underneath it, fixes both problems.
None of them call an external service. That keeps them fast, keeps your drafts private, and means they will still work when the free tier of some other tool disappears. If you find a bug or a limit that has changed, tell us and it gets fixed.
Frequently asked questions
Are these tools really free?
Yes. There is no account, no usage limit and no paid tier. They exist because the same checks come up in every content project we work on, and a tool is faster to share than a checklist.
Is my text stored or sent anywhere?
No. Every tool runs entirely in your browser with plain JavaScript. Nothing you paste is transmitted to a server. A few tools keep your own settings (such as a saved UTM history) in your browser’s local storage, which you can clear at any time.
Can I link to or embed these tools?
You are welcome to link to any tool page. If you want to embed one on your own site or use the code, get in touch through the contact page.
How often are the tools updated?
Whenever a platform changes a limit or a format (character limits, snippet widths, schema types) we update the affected tool and note the change on its page.
What should I build next?
Tell us. The tools on this page came from questions clients ask; if a check you do by hand is missing, send it over.