Deftkit

Free online JSON formatter, validator and beautifier. Paste JSON to format, minify, validate and copy — fast, private, runs in your browser.

Generate responsive CSS clamp() values for fluid typography and spacing. Set min/max sizes and viewports, copy the clamp string instantly.

Convert between TOML and JSON in both directions. TOML 1.0 compliant parser, handles tables, arrays of tables, dates, and nested structures. Runs in your browser.

Convert between YAML and JSON in both directions. Validates syntax, handles nested structures, runs entirely in your browser.

Format, validate, and minify XML in your browser. Shows parse errors with line numbers. Free, fast, entirely client-side.

Convert text between camelCase, snake_case, kebab-case, PascalCase, UPPER, lower, Title Case, and more. Free, fast, runs entirely in your browser.

Translate cron expressions into plain English and see the next fire times. Free, fast, runs entirely in your browser.

Test JavaScript regular expressions against any text. Live match highlighting, capture groups, all flags. Free, fast, runs entirely in your browser.

Compare two JSON objects and see added, removed, and changed values. Free, fast, and 100% client-side — your data never leaves your browser.

Free Markdown editor with live HTML preview. Side-by-side editing, GitHub-flavored Markdown, copy or download HTML — runs entirely in your browser.

Encode and decode Base64 strings online. Convert text to Base64 and back instantly in your browser — free, fast and private.

Convert images to Base64 data URLs for inline embedding in HTML, CSS, or Markdown. Drag-and-drop, instant preview, 100% client-side.

Encode and decode HTML entities online. Escape <, >, &, quotes and any Unicode character for safe HTML embedding. Free, instant, client-side.

Free online URL encoder and decoder. Percent-encode and decode strings for query parameters, paths and fragments.

Decode JSON Web Tokens (JWT) online. Inspect header, payload and signature — entirely client-side, your tokens never leave your browser.

Generate MD5, SHA-1, SHA-256 and SHA-512 hashes online. Free, fast and 100% client-side — your input never leaves the browser.

Generate strong, secure passwords online. Customize length and character sets — runs entirely in your browser, nothing is sent to a server.

Generate strong, memorable passphrases using the EFF short wordlist. Cryptographically random, shows entropy in bits. Runs in your browser.

Generate MD5 hashes online instantly. Paste text, get the 32-character hex digest. Free, runs in your browser — your input never leaves your device.

Generate SHA-1 hashes online. Compute the 40-character SHA1 hex digest of any text instantly in your browser. Free, client-side, private.

Generate SHA-256 hashes online. Compute the 64-character SHA256 hex digest instantly in your browser. Free, 100% client-side, cryptographically secure.

Generate SHA-512 hashes online. Compute the 128-character SHA512 hex digest instantly in your browser. Free, client-side, Web Crypto API.

Free online QR code generator. Create high-quality QR codes for URLs, text, Wi-Fi and contacts — download as PNG or SVG.

Count words, characters, sentences, paragraphs and estimated reading time instantly. Free, runs in your browser, no signup.

Convert any title or text into a clean URL slug. Strip diacritics, collapse spaces, drop punctuation — instant, client-side, free.

Free Lorem Ipsum placeholder text generator. Generate words, sentences or paragraphs of dummy text for designs and mockups.

Generate v4 UUIDs (random, 128-bit) and v7 UUIDs (timestamp-ordered). Free, fast, cryptographically secure, entirely client-side.

Generate realistic fake data for testing and development. Names, emails, phone numbers, addresses, UUIDs, dates — choose fields, set row count, export as JSON, CSV or SQL.

Convert between JSON and CSV in both directions. Handles nested objects with dot-notation flattening and RFC 4180 quoting. Runs entirely in your browser.

Compare two blocks of text and see added, removed, and unchanged lines side-by-side. Free, instant, 100% client-side — your content never leaves your browser.

Convert numbers between binary, octal, decimal, and hexadecimal instantly. Live bidirectional conversion with explanations — free, runs in your browser.

Convert between Unix timestamps and human-readable dates. Free online epoch converter — supports seconds, milliseconds and ISO 8601.

Convert hexadecimal numbers to decimal instantly. Supports arbitrary precision via BigInt, handles 0x prefix. Free, runs in your browser.

Convert decimal numbers to hexadecimal instantly. Arbitrary precision via BigInt, outputs lowercase hex. Free, runs entirely in your browser.

Convert binary numbers to decimal instantly. Arbitrary precision, handles any bit-width. Free, runs in your browser — no ads, no signup.

Convert decimal numbers to binary instantly. Arbitrary precision via BigInt, clean grouped output. Free, runs entirely in your browser.

Convert hexadecimal numbers to binary instantly. Each hex digit maps to 4 bits. Free, runs entirely in your browser, zero dependencies.

Convert binary numbers to hexadecimal instantly. Every 4 bits become one hex digit. Free, runs in your browser, arbitrary precision.

Convert px to rem and rem to px instantly. Set a custom base font size, convert single values or a batch list, copy results. Free, runs in your browser.

Convert colors between HEX, RGB, HSL and CSS color names. Free online color picker and converter for designers and developers.

Generate color palettes from any base color. Complementary, triadic, analogous, split-complementary, tetradic. Free, instant, runs in your browser.

Build layered CSS box-shadow values visually. Multiple shadows, inset support, live preview, copy as CSS or Tailwind. Free, runs in your browser.

Build CSS gradients visually. Linear, radial, and conic with up to 5 color stops. Copy the gradient string instantly — free, runs in your browser.

Check color contrast ratios against WCAG AA and AAA accessibility standards. Enter foreground and background colors, get the ratio and pass/fail verdict instantly.

Generate CSS border-radius values visually. Control each corner independently, preview live, copy as CSS or Tailwind. Free, instant, runs in your browser.

Split a PDF into individual pages or extract a page range. Free, fast, runs entirely in your browser — your file never leaves your device.

Merge multiple PDF files into one in your browser. Reorder pages, drag-and-drop, free, fast — your files never leave your device.

Compress images in your browser. Reduce file size with a live quality preview. Free, fast, and 100% client-side — your images never leave your device.

Resize images in your browser. Set width, height, or both. Lock aspect ratio. Free, fast, and 100% client-side — your images never leave your device.

Convert images between PNG, JPG, and WebP in your browser. Free, fast, and 100% client-side — your images never leave your device.