Calculators, converters, generators, and utilities — fast, private, and built for developers.
17 categories · 216 tools
12 tools
Beautify, minify, and validate JSON, XML, SQL, HTML, CSS, and other structured data.
12 tools
Encode, decode, and hash text with Base64, URL, JWT, SHA, and more.
14 tools
Generate UUIDs, passwords, QR codes, fake data, and random content.
12 tools
Convert timestamps, time zones, calculate date differences, and parse cron.
12 tools
Percentages, fractions, averages, primes, and everyday math.
14 tools
EMI, GST, loans, interest, salary, discounts, and ROI calculators.
16 tools
Convert length, weight, temperature, color, bases, and other units.
16 tools
Count, transform, compare, extract, and clean up text.
14 tools
Convert and transform CSV, JSON, XML, YAML, and tabular data.
10 tools
Create, merge, split, rotate, and convert PDF documents.
14 tools
Resize, compress, crop, convert, and optimize images in the browser.
16 tools
Regex, meta tags, Open Graph, UTM links, curl, and SEO helpers.
12 tools
Password strength, encryption, HMAC, OTP, and certificate utilities.
12 tools
CSS minify, gradients, shadows, flexbox, grid, and design generators.
12 tools
IP subnet, CIDR, MAC, bandwidth, and network calculators.
8 tools
Validate, parse, preview, and build email-related content.
10 tools
Docker, Kubernetes, semver, gitignore, nginx, and config generators.
Answers about free online developer tools, privacy, and how to find the right utility.