Free Online Text Tools
Format, sanitize, analyze, and compare text content instantly in your browser. All lexical operations execute in local browser memory with zero network transmissions.
Which Text Tool Do You Need?
Checking Article Length?
Count words, characters, sentences, paragraphs, and reading time in real-time with Word Counter.
Open Word CounterChanging Capitalization or Naming?
Convert strings between camelCase, snake_case, PascalCase, Title Case, and UPPERCASE using Text Case Converter.
Open Case ConverterComparing Changes or Cleaning Lists?
Highlight side-by-side text differences with Text Diff Checker or clean repeated rows using Remove Duplicate Lines.
Open Diff CheckerAll Text Tools
Word Counter
Count words, characters, sentences, paragraphs, and reading time in real-time.
Text Case Converter
Convert text between UPPERCASE, lowercase, Title Case, camelCase, snake_case, and PascalCase.
Remove Duplicate Lines
Find and remove repeated duplicate lines from text lists and log files.
Text Diff Checker
Compare two text snippets side-by-side to highlight additions, deletions, and differences.
Text Processing Architecture & Algorithms
| Utility | Algorithmic Principle | Input Format | Output Structure | Client Execution |
|---|---|---|---|---|
| Word Counter | Unicode regex boundary segmentation & syllable metrics | Plain text / Markdown / Prose | Word, char, sentence counts & reading time | Synchronous V8 Regex |
| Text Case Converter | Token boundary split & delimiter normalization | Any string / code identifiers | camelCase, snake_case, PascalCase, UPPER | In-Memory Transform |
| Remove Duplicate Lines | O(N) Set hashing & case/whitespace normalization | Multi-line lists / text arrays | Deduplicated line stream | JavaScript Set / Heap |
| Text Diff Checker | Myers O(ND) Longest Common Subsequence (LCS) | Two text documents / code blocks | Visual side-by-side redline unified diff | Client-Side Myers Diff |
Text Processing Frequently Asked Questions
Is my sensitive pasted text safe from server logging?
Yes. All lexical transformations, diff comparisons, and case conversions execute directly inside your browser's JavaScript engine. Not a single character is transmitted to an external server or logged in an API database.
How does the Word Counter handle punctuation and multiple languages?
Our counter leverages Unicode-aware regular expressions to separate word tokens across Latin, Cyrillic, Greek, and Asian script systems, while accurately ignoring punctuation and whitespace delimiters.
Why do cross-platform text diffs sometimes highlight every single line?
Windows uses CRLF (\r\n) line terminators while Unix/macOS uses LF (\n). Our Diff Checker pre-normalizes line endings to prevent false-positive diff reports caused solely by operating system line break variance.
Can Remove Duplicate Lines preserve original line ordering?
Yes. The tool maintains the initial sequential order of items, retaining the first occurrence of each unique row while discarding subsequent duplicates.
Text Diff and File Comparison: Understanding Myers Diff Algorithm
Explore how text comparison utilities compute additions, deletions, and modifications using LCS algorithms.