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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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.
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.
Semantic Line Break Formatter – Online One Sentence Per Line
Paste prose and reformat so that each sentence starts on a new line. Helps with version control diffs.
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.
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.
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.
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.
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.
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.
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.
Word Counter - Online Free Character & Word Count Tool
Count words, characters, sentences, and paragraphs instantly. Analyze text density and reading time. Secure client-side processing for your content privacy.
XML Formatter & Validator - Free Online XML Beautifier
Easily format, validate, and beautify XML documents. Minify XML data with a single click. All processing happens locally in your browser for maximum privacy.
NATO Alphabet Radio Helper - Online Spell Out Words
Type a word and see it instantly spelled with the NATO phonetic alphabet. Ready to say over the phone. Copy the sequence.
Language Flashcard Randomizer - Online Vocabulary Trainer
Paste word pairs (or load pre-made sets) and practice with randomized flashcards. Flip to reveal translation, mark as known/unknown. Local data, no login.
Name Tracing Worksheet Generator – Online Your Child's Name
Type a child's name and create a printable dotted trace sheet. Practice fine motor skills. Local only.
Text to Bullet Points - Online Add • or ‑ Prefixes
Paste lines and convert them into bulleted lists with symbols like •, ‑, or →. Markdown friendly. Quick formatting.
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.
Semaphore Flag Translator – Online Text to Signal & Back
Type a word and see an animated semaphore figure spelling it out. Also enter flag positions to decode. Scouts and maritime fun.
Logic Grid Puzzle Solver & Maker - Online Deduction Tool
Create or solve logic grid puzzles (like Einstein's riddle). Enter clues and mark the grid. Practice logical deduction. Local only.
Language Vocab Shuffler – Online Random Word Practice
Paste words with translations, shuffle, test yourself. Simple local spaced recognition.
CONTRIBUTING.md Generator - Online Community Guide
Create a friendly CONTRIBUTING.md file for your repository by filling in a few sections. Encourage contributions. Static template.
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.
text‑indent & hanging‑punctuation Demo - Online
Set up first‑line indentation and hanging punctuation. See how they affect reading flow. Copy the CSS.
Structured Data Testing Tool - Online Validate Rich Results
Paste your JSON‑LD or Microdata and test it against Google's Rich Results criteria. Get warnings. Local linter.
Text to NATO Phonetic Alphabet - Online Converter
Convert any phrase into the NATO phonetic alphabet (Alpha, Bravo, Charlie…). Copy or hear pronunciation. Useful for call centers.
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.
Random English Name Generator - Online First & Last
Generate a random first and last name typical for US, UK, or Australia. With optional middle initial. Useful for test data.
Auto Caesar Cipher Decoder – Online Rot1‑25 Try All
Paste an enciphered text and instantly see all 25 possible shifts. Highlight the most plausible.