UD5 Toolkit
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.
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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Text Language Detector - Online Identify Language from Input
Paste text and detect its language (70+ languages) using a simple character n-gram model implemented in JavaScript. No server communication.
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.
Accessible Text Formatter - Online Dyslexia Friendly Layout
Apply dyslexia‑friendly fonts, spacing, and background to any text. Preview and copy the formatted version. Improve readability.
Text Similarity Checker - Online Cosine & Jaccard
Paste two texts and see cosine and Jaccard similarity scores. Understand how close two documents are. All local math.
CJK Text Line Break Tester - Online word‑break & line‑break
Test different line‑break and word‑break values on Chinese/Japanese/Korean text. See how browsers wrap. Essential for i18n.
Alphabet Tracing Worksheet - Online Preschool Letter Practice
Generate customizable alphabet tracing sheets with uppercase and lowercase letters. Select letters to focus on. Instant print. Local only.
Proper Noun Highlighter - Online Identify Names, Places in Text
Paste text and quickly highlight potential proper nouns (capitalized sequences). Aid for editing or anonymization. Simple regex-based, local.
Korean Romanization Tool - Online Hangul to Latin
Type or paste Korean Hangul and see the revised romanization. Also works backwards for basic words. Study aid.
Blood Pressure Category Checker - Online AHA & ESC Guideline Tool
Interpret your blood pressure reading based on American Heart Association and European Society of Cardiology categories. Visual gauge with actionable health insights.
Leet Speak Translator - Online 1337 Text Converter
Convert plain text into leet (1337) speak and decode it back. Great for gamer tags and online culture. Fun, free, and local.
Real‑Sample Contrast Checker - Online See Paragraph
See how a full paragraph looks with your chosen text and background colors. Not just a ratio; the real appearance.
ASL Alphabet Quiz - Online Fingerspelling Practice
Test your knowledge of American Sign Language letters. See a sign and type the letter. Improve receptive skills. Local.
Letter Formation Animator – Online Watch Handwrite Letters
Click a letter and watch an animated stroke order for print or cursive. Good for kids learning to write.
Robots.txt Tester - Online Check URL Allow/Disallow
Enter a URL and a user‑agent to see if it is allowed or blocked by the robots.txt file. Quick bot validation.
Text to Bullet Points - Online Add • or ‑ Prefixes
Paste lines and convert them into bulleted lists with symbols like •, ‑, or →. Markdown friendly. Quick formatting.
File Encoding Checker - Online Detect Text File Charset
Upload a text file to detect its character encoding (UTF-8, ISO-8859-1, etc.) and BOM presence. Runs entirely in your browser.
Text Outline Generator - Online Structured Hierarchical View
Paste plain text and turn it into a nested outline using indent levels or Markdown headings. Great for planning.
prefers‑reduced‑motion Tester - Online A11y Check
Simulate reduced motion preference and test your animations. Copy the media query snippet. Keep your users safe.
DNS Lookup - Online Domain Records Checker (A, MX, CNAME)
Query DNS records for any domain directly from your browser using DNS-over-HTTPS. See A, AAAA, MX, CNAME, and TXT records. No logs.
Tab Focus Order Checker - Online Visualize Tab Navigation Flow
Paste HTML and see the order in which elements would receive focus via Tab key. Highlight issues. Local accessibility testing.
Shopping List Builder - Online Categorized Grocery Checklist
Create categorized shopping lists (produce, dairy, meat, etc.). Add items, check them off, and print. Data stored in your browser. Never lose a list.
ISBN Validator - Online Check ISBN‑10 & ISBN‑13
Validate ISBN‑10 and ISBN‑13 numbers and compute their check digits. Useful for booksellers and libraries. All local.
ROT13 Encoder & Decoder - Online Caesar Cipher ROT13
Easily apply ROT13 cipher to obfuscate or reveal text. A classic letter substitution cipher that works bidirectionally. Purely client-side processing.
text‑indent & hanging‑punctuation Demo - Online
Set up first‑line indentation and hanging punctuation. See how they affect reading flow. Copy the CSS.
Font Tech & Format Checker - Online Supports incremental font?
Detect browser support for font‑tech() and font‑format() values in @font‑face src. Check COLRv1, variable, etc.
Regex Lookaround Tester - Online Experiment with Lookahead
Practice positive/negative lookahead and lookbehind. See matches highlighted live. Master advanced regex.
Text Format Cleaner - Online Strip Rich Text & Homogenize
Paste rich text and clean it to plain text. Normalize line endings and whitespace. Prepare for code or databases.
aria‑describedby Visualizer - Online Check Descriptions
Highlight elements with aria‑describedby and see the linked description text. Verify a11y annotations.
Accept‑Language Header Visualizer - Online Locale Match
Paste your Accept‑Language header and see which languages your site should serve based on quality values. Internationalization helper.