Code & Data

Build a .gitignore from common stacks and environments like Node, Python and macOS.

Build well-structured prompts for Claude, ChatGPT or Gemini with the Role–Task–Context–Format method.

Estimate how many tokens your text uses and whether it fits Claude, GPT or Gemini context windows.

Convert audio between MP3, WAV, M4A/AAC, OGG, Opus, FLAC and AIFF — entirely in your browser, nothing uploaded.

Generate Code 128 and EAN-13 barcodes from text or numbers and download them as PNG or SVG.

Encode text to RFC 4648 Base32 and decode Base32 back to readable text.

Encode text to Base64 and decode Base64 back to readable text.

Generate salted bcrypt password hashes and verify a password against an existing bcrypt hash, in your browser.

Convert text to binary and binary back to text.

Visually set each corner's CSS border-radius with a live preview.

Design CSS box-shadows with sliders and a live preview, then copy the code.

Encrypt and decrypt text with a Caesar shift cipher.

Convert text and identifiers to camelCase.

Check the WCAG contrast ratio between two colors and see AA/AAA pass or fail.

Convert colors between HEX, RGB and HSL with a live preview and color picker.

Generate a palette of tints and shades from any base color, click to copy.

Create a QR code that saves your name, phone, email and details straight to a phone's contacts.

Explain any 5-field cron expression in plain English and preview its next run times.

Beautify or minify CSS with custom indentation.

Create CSS linear gradients with a live preview and copy the code.

Convert CSV to JSON and JSON back to CSV with delimiter and header options.

Turn CSV data into a formatted Markdown table.

Convert text and identifiers to dot.case.

Convert between .env files and JSON in both directions — handles quotes, comments and export prefixes.

Draw flowcharts and diagrams in your browser — drag-and-drop shapes, connect them with labeled arrows, style everything, or turn a text outline into a chart. Export to PNG, SVG or JSON. Free, no sign-up.

Beautify or minify GraphQL queries and schemas.

Compute MD5/SHA hashes of any text and compare them against an expected hash to verify integrity.

Convert hexadecimal to readable text and text back to hex.

Encode text to HTML entities (< & …) or decode entities back to plain text.

Beautify or minify HTML with custom indentation.

Convert HTML into clean Markdown.

Paste HTML (or upload an .html file) and download a paginated PDF — rendered and converted entirely in your browser, nothing uploaded.

Beautify or minify JavaScript with custom indentation.

Beautify, validate and minify JSON with clear parse errors.

Convert plain text into an escaped JSON string.

Convert a JSON array of objects into CSV with a custom delimiter.

Convert a JSON object into TOML configuration format.

Turn a JSON sample into TypeScript interfaces automatically — infers types, nested objects and arrays.

Convert JSON objects and arrays into clean, indented XML.

Convert JSON to YAML and YAML back to JSON.

Convert an escaped/stringified JSON string back into readable JSON.

Parse, validate and explore JSON in a collapsible, color-coded tree view.

Decode a JSON Web Token to inspect its header, payload claims and expiry — without sending it anywhere.

Convert text and identifiers to kebab-case.

Estimate what Claude, GPT or Gemini API usage will cost per call, per day and per month.

Tidy and normalize Markdown formatting.

Build Markdown tables in a spreadsheet-style grid with per-column alignment.

Convert Markdown into clean HTML — headings, lists, links, code, bold and more.

Hash text to MD5, or reverse-look-up common MD5 hashes back to their original value.

Generate an MD5 message digest from any text.

Generate SEO and Open Graph / Twitter meta tags for your web pages.

Translate text to Morse code and Morse code back to text.

Sort numbers ascending or descending from comma, space or line-separated input.

Convert text and identifiers to PascalCase.

Test how strong a password is and estimate how long it would take to crack — privately in your browser.

Create QR codes for PayPal.Me, Venmo, UPI or any payment link so people can pay you in a tap.

Convert pixels to rem and em (and back) for any root font size, with a quick reference table.

Create custom QR codes from any URL or text and download them as PNG or SVG — generated entirely in your browser.

Scan and decode a QR code from an uploaded image or screenshot — right in your browser.

Test regular expressions against sample text with live match highlighting.

Build a robots.txt file to control crawlers, with sitemap and custom disallow rules.

Encode and decode text with the ROT13 substitution cipher.

Beautify or minify SCSS with custom indentation.

Generate SHA-1, SHA-256, SHA-384 and SHA-512 hashes from any text, computed securely in your browser.

Turn any text into a clean, SEO-friendly URL slug.

Convert text to snake_case or SCREAMING_SNAKE_CASE.

Beautify and format SQL queries with clause line breaks and consistent keyword case.

Beautify or minify TypeScript with custom indentation.

Convert text to \u Unicode escape sequences and back — handy for code and JSON strings.

Convert between Unix timestamps (epoch) and human-readable dates in both directions.

Percent-encode URLs and decode percent-encoded strings.

Break any URL into its protocol, host, path, query parameters and hash.

Encode text to UTF-8 byte sequences and decode them back.

Build campaign-tagged URLs with utm_source, utm_medium and more.

Create a QR code that connects phones to your Wi-Fi network automatically — no password typing.

Convert a Word (.docx) document into clean Markdown.

Beautify or minify XML with custom indentation.

Convert XML documents into structured JSON, with attributes and nested elements preserved.

Tidy and normalize YAML formatting.