About CleanUpTxt
A privacy-first suite of 67+ text tools across 6 categories - built entirely in TypeScript, running 100% in your browser. No servers, no tracking, no data leaves your device.
67+ Tools, Six Categories
Text Cleaning (9 tools)
Remove line breaks, duplicates, empty lines, HTML tags, commas, special characters, emojis, diacritics, and trim whitespace from lines
Text Formatting (10 tools)
Case converter, find & replace, sort lines, randomize lines, prefix/suffix, text reverser, text diff, bionic reading, text repeater, and text dividers
Conversion Tools (7 tools)
Slugify, CSV-safe formatter, HTML escape/unescape, Base64 encode/decode, URL encode/decode, number to words, and Roman numeral converter
Markdown Tools (9 tools)
Markdown editor, Markdown to HTML, HTML to Markdown, paste to Markdown, table generator, link generator, list generator, URL to Markdown, and document converter
Text Analysis (12 tools)
Word counter, character counter, sentence counter, paragraph counter, syllable counter, text statistics, readability checker, keyword extractor, words to pages, data extractor, image to text (OCR), and JSON visualizer
Text Generators (20 tools)
Invisible text, fancy text, cursive, gothic, bubble, zalgo, upside-down, strikethrough, small caps, bold/italic, vaporwave, superscript/subscript, Wingdings, ASCII sign/banner, Lorem Ipsum and themed generators, and pangrams
How It Works: Client-Side Architecture
Every CleanUpTxt tool runs 100% in your browser using JavaScript. When you paste text, it stays in your browser's memory and is processed by our TypeScript functions. There is no backend server, no API calls, no database. The entire application is a static Single Page Application (SPA) built with React 18 and TypeScript, bundled with Vite, and served as static files from a CDN.
User pastes text → Browser JavaScript processes it → Result displayed
No network request. No server. Your text never leaves your device.
This architecture means CleanUpTxt works offline after the first load (via Service Worker / PWA), has zero latency for text processing (no network round-trip), and provides complete privacy by design - we couldn't access your text even if we wanted to, because there is no server to receive it.
What Powers the Tools
All 67+ tools share a common processing engine - ~1,800 lines of TypeScript with 39 exported functions in a single textUtils.ts file. Every algorithm is hand-written with zero external NLP dependencies:
Readability Analysis
The Readability Checker computes Flesch Reading Ease scores using a custom syllable counter (regex-based vowel group detection with silent ending rules), mapped to U.S. grade levels. No NLTK, no OpenNLP - runs entirely in the browser.
Keyword Extraction (TF-IDF)
The Keyword Extractor uses a full NLP pipeline: stopword filtering, Porter Stemmer-inspired lemmatization, bigram/trigram detection, part-of-speech heuristics (noun boost, capitalization), and TF-IDF scoring - all implemented from scratch in TypeScript.
Unicode Text Generation
Tools like Invisible Text, Fancy Text, and Zalgo Text work by mapping characters to specific Unicode code points (U+200B zero-width space, U+3164 Hangul filler, Mathematical Alphanumeric Symbols block U+1D400-U+1D7FF, combining diacritical marks U+0300-U+036F).
OCR (Image to Text)
The Image to Text tool uses Tesseract.js for client-side OCR with connected component filtering to mask UI artifacts and icons before recognition, improving accuracy on screenshots and scanned documents.
Markdown Processing
Nine Markdown tools handle bidirectional conversion between HTML, formatted text, and Markdown syntax. The Paste to Markdown tool intercepts clipboard HTML and converts it to clean Markdown, preserving tables, lists, and links.
Privacy by Architecture, Not by Policy
Most "privacy-friendly" tools ask you to trust their privacy policy. CleanUpTxt takes a different approach: privacy is enforced by the technical architecture itself.
No Server to Leak Data
CleanUpTxt is a static SPA hosted on a CDN. There is no application server, no database, no API endpoint that receives text. Your browser downloads the JavaScript bundle once, then all processing happens locally.
Cookie-Free Analytics
We use Cloudflare Web Analytics and Vercel Analytics - both privacy-first services that set no cookies and collect no personal data. Only aggregate page view counts and performance metrics (via Vercel Speed Insights). No IP addresses logged, no cross-site tracking, no consent banner needed.
Local Storage Only
Your preferences (dark mode, last input text) are stored in your browser's localStorage - a client-side storage that never leaves your device. We enforce a 1MB limit to avoid quota issues.
You can verify this yourself: open your browser's Developer Tools (F12), go to the Network tab, paste text into any tool, and watch - zero network requests are made during text processing.
Tech Stack
Frontend
- React 18 with TypeScript - strict typing
- Vite 5 with SWC - sub-second HMR
- Tailwind CSS + shadcn/ui (Radix primitives)
- React Router v6 for client-side routing
Performance
- PWA with Service Worker for offline support
- Debounced inputs (200-300ms) on heavy tools
- useMemo for expensive computations
- Zero external NLP libraries - all hand-written TS
Who Built This?
CleanUpTxt is built and maintained by an independent developer focused on creating useful, privacy-respecting web tools. No VC funding, no growth hacking, no data monetization. Just tools that work.
The project has been continuously maintained and improved since its launch, with new tools and improvements shipped regularly. Check our changelog for the full history.
Support This Project
CleanUpTxt is free to use and will always remain free. If you find it useful, consider supporting development and hosting costs:
Get in Touch
Have feature requests, bug reports, or feedback? We'd love to hear from you.
Ready to clean some text?