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<!DOCTYPE html>
<html lang="en">
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<title>Free Text <title>Code & Text Tools — Regex, Diff, Markdown | FreeDevTool</title> Code Tools — Regex, Diff, Markdown | FreeDevTool</title>
<meta name="description" content="9 free code & text tools — regex tester, text diff, markdown preview, case converter, AI token counter, string escape, char counter. Browser-only.">
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<span class="tool-badge">Code & Text Tools</span>
<h1>Code & Text Tools — 9 Free Browser Utilities</h1>
<p class="tool-description">9 free code & text utilities — regex tester & explainer, text diff checker, markdown preview, case converter, AI token counter (GPT-4 / Claude / Gemini), string escape, character counter. Browser-only.</p>
</div>
<p class="category-label">9 Code & Text Tools</p>
<div class="tools-grid">
<a class="tool-tile featured" href="regex-tester">
<div class="tile-icon">.*</div>
<div class="tile-body">
<div class="tile-name">Regex Tester & Debugger</div>
<div class="tile-desc">Test regular expressions with real-time matching and capture group highlighting.</div>
</div>
<span class="tile-badge">Popular</span>
</a>
<a class="tool-tile" href="text-diff">
<div class="tile-icon">±</div>
<div class="tile-body">
<div class="tile-name">Text Diff Checker</div>
<div class="tile-desc">Compare two texts side by side. Highlights additions, deletions and changes.</div>
</div>
</a>
<a class="tool-tile" href="markdown-preview">
<div class="tile-icon">MD</div>
<div class="tile-body">
<div class="tile-name">Markdown Editor & Preview</div>
<div class="tile-desc">Write markdown with live preview. Convert to HTML. GFM tables and code blocks.</div>
</div>
</a>
<a class="tool-tile" href="regex-explainer">
<div class="tile-icon">?=</div>
<div class="tile-body">
<div class="tile-name">Regex Explainer</div>
<div class="tile-desc">Translate regular expressions to plain English. Color-coded token breakdown.</div>
</div>
</a>
<a class="tool-tile" href="case-converter">
<div class="tile-icon">Aa</div>
<div class="tile-body">
<div class="tile-name">String Case Converter</div>
<div class="tile-desc">Convert between camelCase, snake_case, kebab-case, PascalCase and 8 more formats.</div>
</div>
</a>
<a class="tool-tile" href="string-escape">
<div class="tile-icon">\\</div>
<div class="tile-body">
<div class="tile-name">String Escape & Unescape</div>
<div class="tile-desc">Escape and unescape strings for JSON, HTML, JavaScript, URL, CSV and SQL.</div>
</div>
</a>
<a class="tool-tile" href="char-counter" data-name="character count online string length counter word line paragraph bytes tweet sms">
<div class="tile-icon">Σ</div>
<div class="tile-body">
<div class="tile-name">Character / String Length Counter</div>
<div class="tile-desc">Live char, word, line, UTF-8 byte + tweet/SMS limits.</div>
</div>
<span class="tile-badge">New</span>
</a>
<a class="tool-tile" href="word-to-markdown" data-name="word to markdown converter text rich google docs paste html gfm">
<div class="tile-icon">MD</div>
<div class="tile-body">
<div class="tile-name">Word / Rich Text to Markdown</div>
<div class="tile-desc">Convert pasted Word or HTML content to clean Markdown.</div>
</div>
<span class="tile-badge">New</span>
</a>
<a class="tool-tile" href="ai-token-counter" data-name="ai token counter gpt claude cost estimator openai anthropic pricing llm prompt">
<div class="tile-icon">AI</div>
<div class="tile-body">
<div class="tile-name">AI Token Counter</div>
<div class="tile-desc">Estimate GPT / Claude tokens and cost for any prompt.</div>
</div>
<span class="tile-badge">New</span>
</a>
</div>
<!-- When to use which tool -->
<section class="use-cases">
<h2>Best free code & text tools for 2026</h2>
<p>Code & text tools sit between writing and shipping — every diff before commit, every regex before prod, every markdown render before publish runs through one of these utilities. The 9 tools in this category cover the operations that show up dozens of times per day in real engineering workflows: regex pattern testing with live capture-group display, two-document diff with line-level granularity, AI-token counting for prompt budgeting (GPT-4o, Claude Sonnet, Gemini), and the escape/unescape variants needed when shuttling strings between JSON, HTML, JavaScript, and shell. All run client-side via the browser's native regex engine, native <code>JSON.stringify</code>, and tokenizer libraries shipped as static JS — no input is ever uploaded.</p>
<h3>What's the difference between regex testing and regex explaining?</h3>
<p>A <strong>regex tester</strong> takes a pattern and a sample string and shows whether the pattern matches, what each capture group caught, and the full vs first match. Use it when you have a pattern and want to confirm it does what you intended. A <strong>regex explainer</strong> takes a pattern alone and translates it into plain English ("matches one or more digits, then a hyphen, then 3-4 word characters"). Use it when reading someone else's regex or auditing a complex production pattern. Both tools live in this cluster — <a href="/regex-tester">Regex Tester</a> for the former, <a href="/regex-explainer">Regex Explainer</a> for the latter.</p>
<h3>How do I count GPT-4 or Claude tokens online without sending my prompt to an API?</h3>
<p>The <a href="/ai-token-counter">AI Token Counter</a> ships the same tokenizer libraries (cl100k_base for GPT-3.5/4, o200k_base for GPT-4o, Anthropic's tokenizer for Claude, Gemini SentencePiece) compiled to WebAssembly. Tokenization runs locally — your prompt text never reaches OpenAI, Anthropic, or Google servers. Verify with DevTools → Network tab: zero outgoing requests during count. This matters because production prompts often contain customer data or unreleased features; sending them to OpenAI's token counter API is the same data exposure as sending them to the model itself.</p>
<h3>Code & text cluster — pick the right tool</h3>
<table class="ref-table">
<thead><tr><th>Need</th><th>Tool</th></tr></thead>
<tbody>
<tr><td>Test a regex pattern with live match preview</td><td><a href="/regex-tester">Regex Tester</a></td></tr>
<tr><td>Translate a regex into plain English</td><td><a href="/regex-explainer">Regex Explainer</a></td></tr>
<tr><td>Compare two text/code blocks line by line</td><td><a href="/text-diff">Text Diff Checker</a></td></tr>
<tr><td>Preview Markdown as HTML</td><td><a href="/markdown-preview">Markdown Preview</a></td></tr>
<tr><td>Convert camelCase ↔ snake_case ↔ kebab-case</td><td><a href="/case-converter">Case Converter</a></td></tr>
<tr><td>Count tokens for GPT-4 / Claude / Gemini prompts</td><td><a href="/ai-token-counter">AI Token Counter</a></td></tr>
<tr><td>Escape strings for JSON / HTML / JavaScript</td><td><a href="/string-escape">String Escape / Unescape</a></td></tr>
<tr><td>Count characters / words / SMS segments</td><td><a href="/char-counter">Character & Word Counter</a></td></tr>
<tr><td>Color contrast check (accessibility)</td><td><a href="/wcag-contrast">WCAG Contrast Checker</a></td></tr>
</tbody>
</table>
<h2>Which code & text tool should you use?</h2>
<p>Code and text tools cover the day-to-day grind: testing a regex you'll never remember, comparing two configs, escaping strings for JSON or HTML, counting tokens before sending a prompt to GPT or Claude. The right choice depends on the format you're wrestling with and whether you need deep analysis (regex explainer) or a quick transform (case converter).</p>
<ul class="use-case-list">
<li><strong>Test and debug a regex pattern</strong> with live highlighting and capture groups (JS flavor) — use <a href="regex-tester">Regex Tester & Debugger</a>.</li>
<li><strong>Translate a regex to plain English</strong> when inheriting unfamiliar patterns — use <a href="regex-explainer">Regex Explainer</a>.</li>
<li><strong>Compare two text blobs side by side</strong> (configs, log diffs, JSON responses) — use <a href="text-diff">Text Diff Checker</a>.</li>
<li><strong>Write/preview Markdown</strong> with GitHub-flavored tables and code blocks — use <a href="markdown-preview">Markdown Editor & Preview</a>.</li>
<li><strong>Convert pasted Word/Google Docs content to clean Markdown</strong> — use <a href="word-to-markdown">Word to Markdown Converter</a>.</li>
<li><strong>Convert variable names</strong> between camelCase, snake_case, kebab-case, PascalCase — use <a href="case-converter">String Case Converter</a>.</li>
<li><strong>Escape strings for JSON, HTML, JavaScript, URL, CSV, or SQL</strong> — use <a href="string-escape">String Escape & Unescape</a>.</li>
<li><strong>Count characters, words, lines, bytes</strong> for tweet limits, SMS, OG titles — use <a href="char-counter">Character Counter</a>.</li>
<li><strong>Estimate AI API costs</strong> before sending a prompt to GPT/Claude — use <a href="ai-token-counter">AI Token Counter</a>. Catches expensive prompts early.</li>
</ul>
<h3>Common code & text mistakes to avoid</h3>
<ul class="mistakes-list">
<li><strong>Greedy regex that matches too much.</strong> <code>.*</code> grabs everything to the end of line. Use <code>.*?</code> (lazy) or a more specific character class.</li>
<li><strong>Forgetting to escape the dot in regex.</strong> <code>.</code> matches any character — use <code>\.</code> when you mean a literal period (e.g. matching <code>example\.com</code>).</li>
<li><strong>Diffing two files that have different line endings.</strong> CRLF vs LF causes every line to show as changed. Normalize line endings first.</li>
<li><strong>Mixing escape contexts.</strong> JSON-escaping <code>"</code> as <code>\"</code> then re-encoding for HTML produces double-escaped junk. Encode once, in the final destination format.</li>
<li><strong>Trusting the 4-chars-per-token heuristic for non-English.</strong> CJK, code, and emojis can be 1 char per token or worse. Always count tokens in the actual tokenizer for cost-sensitive prompts.</li>
<li><strong>Counting characters for Twitter/X without weighting URLs.</strong> URLs count as 23 chars regardless of length. Use a counter that knows the rules.</li>
</ul>
</section>
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