Practical tools · Free forever · No signup
Developer Tools Tools
901 free calculators, converters and checkers — built for SG, MY and the region, reviewed with current figures. No accounts, no paywalls.
Build a .gitignore from your stack, OS and editor
Unicode, UTF-8, UTF-16, Big5, GBK and GB18030 for any character
Calculate Unix file permissions instantly — switch between octal (755), symbolic (-rwxr-xr-x) and a visual checkbox grid. Includes special bits (setuid, setgid, sticky).
Convert names between camelCase, snake_case, kebab-case & more
8 CVD types — colors + images
Multi-layer shadow stacks
Polygon vertex editor
Draggable easing curve editor
px ↔ rem ↔ em ↔ pt
View, sort, and convert CSV to JSON, SQL, XML, or Markdown
Encode text to HTML entities, or decode them back
Paste JSON — get TypeScript interfaces, Python dataclasses, Go structs & Kotlin data classes
Turn CSV or pasted data into a clean Markdown table
Convert Markdown to a clean PDF, with LaTeX math
Modular typography scale
Epoch ↔ ISO 8601 ↔ local time
WCAG 2.1 AA/AAA accessibility
Generate QR codes for URLs, text, Wi-Fi, vCard, and more
Format, validate and minify JSON instantly — with clear error messages and line numbers.
Convert between binary, octal, decimal and hexadecimal — instantly.
Generate favicons in all sizes from any image or text — download ready-to-use ICO, PNG and SVG files.
Generate strong, random passwords with custom length and character rules.
Generate UUIDs v1/v4 and ULIDs instantly — bulk generation, multiple formats.
Generate MD5, SHA-1, SHA-256 and SHA-512 hashes instantly — for passwords, files and data integrity.
Test and debug regular expressions in real time — with match highlighting, groups and a built-in reference.
Pick colours and convert between HEX, RGB, HSL and CMYK — with CSS snippets ready to copy.
Generate CSS gradient code visually
Build a cron schedule, or read one you already have
Decode and inspect any JWT token instantly — header, payload, expiry and signature details, all in your browser.
Find your public IP address and look up any IP's location, ISP and organisation instantly.
Look up every HTTP status code instantly — with plain-English descriptions, use cases and fix tips.
Encode text or files to Base64 and decode Base64 strings — instantly, in your browser.
Convert colours between HEX, RGB, HSL and CMYK — with live preview.
Encode and decode URLs and query strings instantly — with full RFC 3986 component support.
Build structured AI prompts using CRAFT, RTF, RACE, CO-STAR, RISEN, APE — 6 industry frameworks + 30 templates + ChatGPT/Claude/Gemini-tuned output.
Type Markdown on the left, see HTML preview on the right. GitHub-flavored: headings, lists, tables, code blocks, task lists. In-browser, no signup.
Search, copy, and test regular expressions instantly.
Strip dot tricks, plus-aliases, and capitalisation to find the underlying email.
Calculate network, broadcast, host range, and subnets from CIDR or netmask.
Generate random MACs and look up vendor (OUI) for any MAC address.
Decode browser, OS, device type, and bot signals from any User-Agent string.
Build the WiFi-connect string (SSID + password + security) for QR sharing.
Convert a docker run command to docker-compose.yml — handles ports, volumes, env, restart, networks.
Convert between JSON, YAML, XML, and CSV. Auto-detect input format, side-by-side editors, all client-side.
Parse and format international phone numbers with libphonenumber. Country dropdown defaults to ASEAN.