Utilities Tools — 19 Free Online Utilities Utilities
A grab-bag of everyday developer utilities: diff two text blocks side by side, test regular expressions with live highlighting, convert between CSV and JSON, preview GitHub-Flavored Markdown, format SQL across dialects, build color palettes, generate QR codes, parse or build cron schedules, and count words and characters.
All Utilities tools
Text Diff
Side-by-side text comparison with line and word highlights.
Regex Tester
Test regular expressions with flags, captures, and replace.
CSV to JSON
Parse CSV data and convert it to a JSON array.
JSON to CSV
Convert a JSON array of objects to CSV format.
Markdown Preview
Live preview Markdown as rendered HTML.
SQL Formatter
Format and beautify SQL queries with dialect support.
Color Palette Generator
Generate complementary, analogous, and triadic color palettes.
QR Code Generator
Generate QR codes from any text or URL.
Cron Expression Parser
Parse cron expressions into human-readable schedules.
Cron Expression Generator
Build cron expressions from UI field controls.
Word & Character Counter
Count words, characters, sentences, paragraphs, and reading time.
cURL Converter
Convert cURL commands into runnable code in fetch, Axios, Python, Node, Go, PHP, or Ruby.
Image Compressor
Compress JPEG, PNG, and WebP images in your browser. No upload required.
HTTP Status Code Reference
Searchable reference for every HTTP status code with explanations and when-to-use guidance.
ATS Resume Checker
Check if your resume is ATS-friendly. Upload a PDF or Word file — analysis runs entirely in your browser.
Resume Builder
Build a clean, ATS-friendly resume and download it as a PDF — free, no sign-up, no watermark, unlimited downloads.
Invoice Generator
Create professional invoices and download them as PDF — free, no sign-up, no watermark. Live totals with tax and discount.
Excel to JSON
Convert Excel (.xlsx, .xls) and CSV files to JSON or CSV in your browser. Multi-sheet support, free, no upload.
HAR File Analyzer
Analyze a HAR file in your browser — request count, total size, timings, and breakdowns by status, type, and domain. Free.
Frequently asked questions
- Does the SQL Formatter run real SQL queries?
- No — it only reformats SQL text for readability. Nothing is executed against any database, and no SQL is sent to a server.
- Which regex flavor does the Regex Tester use?
- JavaScript's native RegExp engine (ECMAScript). Supports the g, i, m, s, u, and y flags. PCRE-only features like recursive patterns are not supported.
- Can I generate QR codes for vCards or Wi-Fi credentials?
- Yes — paste the appropriate string (e.g. WIFI:T:WPA;S:MyNetwork;P:password;;) and it will encode into a scannable QR code. Download the result as PNG.
- What cron syntax does the Cron Parser support?
- Standard 5-field Unix cron syntax (minute hour day-of-month month day-of-week). Parses common expressions and shows the next 5 execution times.
- How is reading time calculated in the Word Counter?
- Reading time uses an average reading speed of 200 words per minute, which is the conventional figure for adult readers on screen.
- Does the Markdown Preview support GitHub-Flavored Markdown?
- Yes. Tables, code blocks with syntax highlighting, task lists, strikethrough, and autolinks all render correctly.