Developer Tools Tools

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

6 CVD views + greyscale, adjustable severity

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

Decode a PayNow, DuitNow, QRIS, PromptPay or VietQR payload and recompute its checksum

Encode text to HTML entities, or decode them back

Fix 文字化け and see any character in Shift_JIS, EUC-JP, ISO-2022-JP and UTF-8

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.

Random MACs, local by default; read any MAC's flag bits and, where three bytes can tell, its block holder.

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.