Data & ops analysts

CSV to Excel Converter

Turn CSV files into formatted .xlsx spreadsheets in your browser — no upload, no sign-up.

JSON to CSV / CSV to JSON

Convert JSON arrays to spreadsheets-ready CSV and back, including nested fields.

JSON Formatter & Validator

Beautify, validate and minify JSON with clear error positions — all in your browser.

YAML to JSON Converter

Convert YAML config files to JSON and back, with validation and error messages.

Word Counter

Count words, characters, sentences, paragraphs and estimate reading time as you type.

Sort & Deduplicate Lines

Sort lines alphabetically, remove duplicates, trim spaces and delete blank lines.

Case Converter

UPPER, lower, Title, sentence, camel, snake, kebab and alternating case in one click.

UUID Generator

Generate one or thousands of RFC-4122 v4 UUIDs instantly, with optional braces and uppercase.

Random Number Generator

Generate cryptographically secure random numbers, with or without repeats.

Percentage Calculator

Calculate percentages, percentage increase and change instantly in your browser.

Barcode Generator

Create CODE128, EAN-13, UPC, CODE39 and ITF barcodes as PNG or SVG, free.

Currency Converter

Convert between world currencies with daily mid-market rates; works offline with a bundled snapshot.

Statistics Calculator

Paste a data set to get mean, median, mode, range, variance and standard deviation.

Sample Size Calculator

Get the required survey sample size for 90/95/99% confidence, margin of error and population size.

NPV & IRR Calculator

Enter a discount rate on the first line and cash flows below to compute NPV and IRR.

Combination & Permutation Calculator

Enter n and r to compute nCr combinations, nPr permutations and factorials.

GCD & LCM Calculator

Enter integers to get the greatest common divisor, least common multiple and prime factors.

Keyword Density Analyzer

Count word frequencies and density percentages in your content, with the top terms ranked.

URL Parser & Query Expander

Break URLs into protocol, host, port, path and every query parameter, one per line.

User-Agent Parser

Detect browser, engine, operating system and device type from a User-Agent string.

CSV Viewer & Filter

Open large CSV files in your browser, search and filter rows, then copy or export.

JSON Diff Checker

Compare two JSON documents and see added, removed and changed values side by side.

Fake Data Generator

Generate mock names, emails, phones, addresses and UUID rows or JSON for testing.

ZIP File Tools

Create and extract ZIP archives in your browser — no upload, files never leave your device.

HTTP Status Codes Reference

A searchable list of every HTTP status code with meanings and guidance for developers.