DevToolkit

Every developer utility. One workspace. All processing happens locally in your browser.

Text Tools

Case conversion, cleanup, statistics and everyday text transforms.

  • Case Converter — Convert text and identifiers between camelCase, snake_case, Title Case and 15 more styles.
  • Text Cleaner — Chain trims, dedupes, sorts, extractions and normalizations into an ordered pipeline.
  • Find & Replace — Plain-text or regex search and replace with live match highlighting and preview.
  • Text Statistics — Characters, words, sentences, reading time, frequent words and the longest line.
  • Markdown Preview — Live, sanitized GitHub-flavored Markdown preview with HTML export.
  • Whitespace Visualizer — Reveal tabs, spaces, non-breaking and zero-width characters, and line endings.
  • Unicode Inspector — Inspect every character: code point, category, UTF-8 and UTF-16 encoding.
  • Wrap & Unwrap — Hard-wrap text at a column width, or join wrapped lines back into paragraphs.
  • Word Frequency — Rank words or phrases by frequency with stop-word filtering and CSV/JSON export.
  • Duplicate Line Finder — Find repeated lines with counts and line numbers, or output unique lines only.
  • List Converter — Turn lines into comma-separated values and back, with quoting and wrapping options.
  • Slug Generator — Create clean, URL-safe slugs with transliteration and custom separators.

Compare & Diff

Line, word and structural comparison for text, JSON and config files.

  • Text Diff — Compare any two texts or files line by line with word- and character-level highlights.
  • JSON Diff — Structural JSON comparison by path — ignores key order, matches arrays by id.

JSON & Data

Format, validate, query and convert JSON, CSV, YAML and XML.

  • JSON Formatter — Beautify, minify, validate and sort JSON with precise error locations.
  • JSON Tree Viewer — Explore JSON as a collapsible tree; search keys and values, copy paths.
  • JSON to CSV — Convert arrays of objects into CSV with configurable flattening and delimiters.
  • CSV to JSON — Parse CSV or TSV into JSON with header mapping and type inference.
  • CSV Viewer — Open large CSV/TSV files as a fast, sortable, filterable table.
  • JSON ⇄ YAML — Convert between JSON and YAML in either direction with validation.
  • JSON ⇄ XML — Convert between JSON and XML with documented attribute and text-node conventions.
  • JSONPath Explorer — Query JSON with JSONPath expressions and copy the matching paths and values.
  • JSON Schema Validator — Validate a document against JSON Schema (drafts 4, 7, 2019-09 and 2020-12).
  • JSON Escape / Unescape — Escape text into a JSON string literal, or unescape nested stringified JSON.
  • JSON Object Utilities — Flatten, unflatten, sort keys, strip nulls or empties, extract keys and merge objects.
  • JSON to TypeScript — Generate TypeScript interfaces or types from JSON, with nested and optional inference.

Encoders & Decoders

Base64, URL, HTML entities, JWT, Unicode and hashing.

  • Base64 — Encode and decode Base64 / Base64URL text and files, Unicode-safe.
  • URL Encoder / Decoder — Percent-encode and decode URI components with malformed-escape detection.
  • HTML Entities — Escape text into HTML-safe entities and decode named or numeric entities.
  • JWT Decoder — Decode JWT header and claims, explain expiry, and optionally verify signatures.
  • Unicode Escapes — Convert text to code points and \u, \x, &#x; or U+ escapes — and back.
  • Text ⇄ Binary / Hex — Represent text as binary, hex, octal or decimal bytes and convert back.
  • UTF-8 Inspector — Hex dump of UTF-8 / ASCII bytes alongside the characters they encode.
  • Hash Generator — SHA-1/256/384/512 digests and HMACs via Web Crypto, plus MD5 as a legacy checksum.
  • Data URI — Create data: URIs from files or text and decode them with a safe preview.

Generators

UUIDs, passwords, placeholder text, sample data and palettes.

  • UUID Generator — Bulk-generate v4 and time-ordered v7 UUIDs; validate and inspect existing ones.
  • Password Generator — Cryptographically random passwords and passphrases with entropy estimates.
  • Lorem Ipsum — Placeholder words, sentences or paragraphs, as plain text, HTML or Markdown.
  • Random Data — Synthetic records — names, emails, dates, numbers — as JSON, CSV or NDJSON.
  • Random ID — NanoID-style IDs, ULIDs, hex tokens and random strings with custom alphabets.
  • Color Palette — Build palettes from a base color: shades, complementary, triadic and more.

Date & Time

Timestamps, time zones, date math and cron schedules.

  • Timestamp Converter — Convert Unix seconds or milliseconds and ISO 8601 into local, UTC and relative time.
  • Date Difference — Calendar-aware duration between two dates, plus add or subtract durations.
  • Time Zone Converter — Convert a moment across IANA time zones with offsets and DST awareness.
  • Date Formatter — Render a date as ISO, RFC 3339, RFC 2822, custom patterns or relative time.
  • Cron Expressions — Explain cron schedules in plain English and list the next run times.

Web & CSS

CSS and HTML formatting, visual CSS builders, colors and meta tags.

  • CSS Beautify & Minify — Beautify CSS for reading or minify it for production, with size savings.
  • HTML Beautify & Minify — Format or minify HTML while preserving <pre>, scripts and inline whitespace.
  • CSS Gradient — Design linear, radial and conic gradients visually and copy the CSS.
  • Box Shadow — Layer multiple box-shadows with live preview and copy-ready CSS.
  • Border Radius — Shape per-corner and elliptical border radii visually.
  • Color Converter — Convert between HEX, RGB, HSL, HSV, HWB and OKLCH notations.
  • Contrast Checker — WCAG 2.x contrast ratio and AA/AAA pass/fail for text and UI colors.
  • Meta & Open Graph Tags — Generate SEO, Open Graph and Twitter card tags with a link-preview mockup.
  • SVG Viewer & Optimizer — Preview SVG safely, optimize it with SVGO, format it and export a data URI.
  • URL Parser & Builder — Break URLs into parts and edit query parameters as a table.

Developer Utilities

Regex, SQL, HTTP, environment files and type generation.

  • Regex Tester — Test JavaScript regular expressions with live highlights, groups and explanations.
  • SQL Formatter — Format or minify SQL for PostgreSQL, MySQL, SQLite, BigQuery and more.
  • Code Formatter — Prettier in the browser for JavaScript, TypeScript, CSS, HTML, JSON, Markdown and YAML.
  • API Response Inspector — Profile a JSON response: shape, array statistics, value search and path extraction.
  • HTTP Header Parser — Parse raw request/response headers and audit common security headers.
  • Env File Tool — Parse, validate, sort and compare .env files — secrets masked by default.
  • Data Size Converter — Convert between bytes, KB/MB/GB (decimal) and KiB/MiB/GiB (binary).
  • Number Base Converter — Arbitrary-precision conversion between binary, octal, decimal, hex and bases 2–36.