Text Processing Tools Every Developer Should Bookmark
A roundup of browser-based text tools for word counting, frequency analysis, case conversion, deduplication, string reversal, and diff checking — no server, no ads.
Text manipulation is a daily task for developers that often gets done with a script, a quick regex, or a trip to a tool site. The problem with most text tool sites is they are plastered with ads, require accounts, or send your content to a server. If you are processing API keys, customer data, or internal configuration, that is not acceptable.
Here is a roundup of text processing tools that run entirely in your browser — nothing leaves your tab.
Word and character counting
Word counters are useful beyond writing — they are a quick way to check API payload sizes, verify that copy fits within character limits, or analyse the keyword density of a page before publishing.
The Word and Character Counter counts words, characters (with and without spaces), sentences, paragraphs, and estimates reading time at 200 words per minute. It also runs keyword density analysis, showing the top 10 most-used words with frequencies — useful for checking whether your content is overusing a particular term or missing a target keyword.
Word frequency analysis
When you need more than a simple count, the Word Frequency Analyser breaks down every word in a text and ranks them by occurrence. This is useful for content analysis, identifying repetitive writing, checking translation quality, or analysing log output for recurring patterns.
Case conversion
Converting between naming conventions is tedious to do manually and easy to get wrong. The Text Case Converter handles all the common formats in one step:
- camelCase — for JavaScript variables and function names
- PascalCase — for class names in most languages
- snake_case — for Python variables, database columns, and PHP array keys
- kebab-case — for CSS class names, HTML attributes, and URL slugs
- SCREAMING_SNAKE_CASE — for constants and environment variables
- Title Case — for headings and display text
- Sentence case — for body copy and descriptions
Paste a list of column names from a database schema, convert to camelCase for your JavaScript model, and you are done. No find-and-replace, no manual editing.
Removing duplicate lines
Duplicate lines show up constantly: exported lists with repeated entries, log files with repeated events, merged configuration files, or copied data that doubles up. The Duplicate Line Remover strips duplicates from any text block. Options include case-sensitive or case-insensitive matching, trimming whitespace before comparing, and sorting the output after deduplication.
String reversal
The String Reverser reverses text character by character, word by word, or line by line. The character-by-character reverse is useful for encoding checks and testing parsers. The word-by-word reverse is used in certain text processing algorithms and natural language experiments. The line-by-line reverse flips the order of a list, useful for reversing chronological output from logs.
Generating placeholder text
Placeholder text is needed constantly during development — for testing layouts, populating database seeds, demonstrating features with realistic-looking content, and filling in forms during QA. The Lorem Ipsum Generator produces paragraphs, sentences, words, or list items on demand. You control the count and can toggle the classic "Lorem ipsum" opener. Output can be wrapped in HTML <p> or <li> tags for direct pasting into templates.
Comparing two versions of text
Comparing configuration files, checking what changed between two API responses, or reviewing a rewritten paragraph — the Diff Checker highlights additions, removals, and unchanged lines with colour coding and line numbers. It uses the Longest Common Subsequence algorithm for accurate results. Both input panels have line number gutters that scroll in sync with the content.
This is particularly useful when you do not have access to a proper diff tool — pasting two config file versions into the browser gives you an immediate visual comparison without needing git or a desktop application.
A practical workflow combining multiple tools
A common task: you receive a CSV export from a client with column headers in mixed case with spaces ("First Name", "Last Name", "Email Address"), and you need to map them to snake_case database columns. Paste the headers into the Case Converter, output snake_case, then paste the result into the Duplicate Line Remover to check for any repeated columns. Done in under a minute, without writing a script.
Tools
- Word and Character Counter — counts words, characters, sentences, reading time, and keyword density
- Word Frequency Analyser — ranks every word by occurrence frequency
- Text Case Converter — converts between camelCase, snake_case, kebab-case, PascalCase, and more
- Duplicate Line Remover — strips duplicate lines with case and whitespace options
- String Reverser — reverses text by character, word, or line
- Lorem Ipsum Generator — generates placeholder paragraphs, sentences, and words
- Diff Checker — compares two text blocks line by line with colour-coded output