UD5 Toolkit
Contextual Spell Checker – Commonly Confused Words
Paste your text to highlight commonly confused words (their/there, affect/effect) with usage explanations. A second set of eyes for editing important emails.
Basic Grammar Checker - Online Free Writing Assistant
Basic Grammar Checker
Free online writing assistant to catch common grammar, spelling, and punctuation mistakes. Perfect for essays, emails, and quick proofreading.
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Frequently Asked Questions
It is a free online writing assistant that quickly identifies common English grammar, spelling, and punctuation errors. You can paste any text and receive instant suggestions to improve its clarity and correctness.
Absolutely free – no registration, no hidden fees. All checks run locally in your browser, so your text never leaves your device. You can use it as often as you like.
It checks for spelling errors (common misspellings), punctuation (missing spaces after commas, sentence capitalization), repeated words, double spaces, misuse of easily confused words (e.g., their/there/they're), passive voice overuse, and overly long sentences. It also highlights stylistic suggestions.
This is a lightweight, browser-based alternative that catches many common errors. Professional tools use advanced AI and have larger databases, so they can detect more complex issues. Our tool is perfect for quick checks, especially when privacy matters (no data sent to servers).
No. The entire analysis happens inside your browser using JavaScript. We do not upload, save, or share your content. Once you close the page, all data is gone.
Currently, it only supports English grammar and spelling checks. We may add other languages in the future based on user feedback.
There is no hard limit, but for best performance we recommend checking texts up to 5,000 words. Very long documents may slow down the in-browser analysis.
We welcome your feedback! You can reach out through the contact form on our website. Your suggestions help us refine the rule set and make the checker smarter.
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Online Spell Checker - Free Text Correction with Suggestions
Check English spelling and get suggestions using the browser's built-in dictionary. Highlight errors instantly. No data leaves your machine.
Simple Sentence Diagrammer – Online Visual Grammar
Type a simple sentence and see a rudimentary Reed‑Kellogg diagram. Educational.
Sentence Stretcher – Online Add Details for Length
Type a simple sentence and get guided prompts to add who, what, where, when, why. Build richer sentences.
PWA Install Prompt Checker - Online See beforeinstallprompt Status
Check if the browser has captured the beforeinstallprompt event. Understand why your PWA is (or isn't) installable.
Password Pwned? Checker - Online k‑Anonymity
Check if a password appears in the Have I Been Pwned database using k‑Anonymity. Only the first 5 characters of the hash are sent.
Color Contrast Ratio Tester - Online WCAG AA/AAA Check
Enter foreground and background colors to instantly see the contrast ratio and pass/fail for AA and AAA. Simple and fast.
SSL Cipher Suite Checker - Online Test TLS Security
Check which cipher suites a website supports and identify weak or outdated ones. Quick security audit from your browser.
HSTS Header Checker - Online Strict‑Transport‑Security
Fetch a site’s HSTS header and validate its syntax, max‑age, and subdomain flags. Ensure your site enforce HTTPS.
Parts‑of‑Speech Tagger - Online Text Analyzer
Paste a sentence and see each word tagged with its part of speech (noun, verb, adjective). Local rule‑based analysis.
API Status Checker - Online Test Endpoint & Response
Enter an API URL and quickly check its HTTP status code and response time. See response headers and body. Browser fetch.
Font Fallback Checker - Online See Missing Glyphs
Type any character and see how it renders in different font stacks. Detect missing glyphs and fallback behavior.
Live Website Audit Checker - Online Quick SEO & Performance
Enter a URL and get a one‑page report of titles, description, headings, image alts, and broken links. All from browser.
Browser Extension Headers Check - Online Detect Injected Scripts
Look at HTTP headers and JavaScript objects to guess which browser extensions might be installed. For awareness.
npm Version Range Checker - Online SemVer & Tilde Caret
Enter a package name and version range to see all satisfying versions from the registry. Understand ^ and ~.
Password Policy Checker - Online Test Against Rules
Define minimum length, uppercase, digits, special chars, and check if a password meets your custom policy. Instant feedback.
IBAN Structure Checker - Online Validate Format & Country
Check if an IBAN has the correct length and structure for its country. Early validation, no bank connection.
Image Format MIME Checker - Online Identify True Type
Drop an image that might have wrong extension and see its real format (JPEG, PNG, WebP) based on header bytes.
Favicon Checker - Online Test Any Site's Icon
Enter a URL and see its favicon at all standard sizes. Check if it's properly defined. SEO basic check.
Mersenne Prime Checker - Online 2^p‑1 Validation
Check if a number of the form 2^p‑1 is a Mersenne prime. Quick Lucas‑Lehmer test simulation for small p.
Random Word Prompt - Online Creative Writing Inspiration
Get three random words as a creative writing prompt. Challenge yourself to use them in a story. No repeat for a while.
HTTP Redirect Path Tracer - Online SEO Chain Analyzer
Trace the full redirect path of a URL. See every hop, status code, and final destination. Detect broken chains.
Email Spam Score Checker - Online Newsletter Tester
Paste your email body and subject, and get a spam score based on common trigger words and patterns. Improve your cold outreach.
Homophone Checker - Online Sound‑Alike Words Tool
Type a word to see all its homophones with definitions. Avoid embarrassing mistakes (their/there/they’re). Static dictionary.
Leap Year Checker - Online Verify February 29
Enter a year to check if it is a leap year. Shows the rule explanation and next/previous leap years. Simple reference.
Isogram Checker - Online Words Without Repeating Letters
Find out if a word is an isogram (no repeating letters). Different types: first-order, second-order. Word nerd fun.
Palindrome Checker - Online Test Words & Sentences
Check if a word or phrase is a palindrome (reads same forward and backward). Live validation and fun facts.
URL Status Code Checker - Online Bulk HTTP Response Tool
Check HTTP status codes for multiple URLs at once. Identify broken links and redirects. All requests made via browser fetch.
Gravatar Generator & Checker - Online Email to Avatar
Preview the Gravatar image associated with any email address. Generate the correct Gravatar URL. Handy for avatar debugging.
Is It Down or Just Me - Online Website Uptime Checker
Check if a website is globally reachable or experiencing issues. Status code and latency displayed. Quick browser-side test.