Development

Convert Comma Separated Values (CSV) to structured JSON data easily.

Compare two JSON objects and see exactly which keys were added, removed, or changed -- ignores key order. Free and runs entirely in your browser.

A lightweight, simple tool to edit and refine your JSON data directly.

Prettify and format messy JSON instantly. Free, browser-based JSON formatter with syntax highlighting and error detection.

Compress your JSON data to the smallest size for optimal storage and transport. Remove all unnecessary whitespace instantly.

Free JSON Schema validator. Paste a schema and a JSON document to check types, required properties, enums, formats, patterns, $ref and combinators, with every error listed by JSON Pointer path. Draft-07, 2019-09 and 2020-12.

Flatten JSON arrays into Comma Separated Values (CSV).

Convert a JSON array of objects into ready-to-use HTML table markup instantly in your browser. Perfect for quickly embedding structured data into a web page.

Convert JSON data into plain, human-readable text.

Convert JSON arrays into Tab Separated Values (TSV).

Generate TypeScript interfaces or type aliases from sample JSON. Arrays of objects are merged with optional properties, nested objects get their own named types and identical shapes are reused. Runs in your browser.

Convert JSON data structures into XML formats.

Convert JSON data into clean, indented YAML instantly in your browser. Perfect for Kubernetes manifests, CI/CD configs, and Docker Compose files.

Check if your JSON is valid according to RFC 8259 standards. Get detailed error reports and syntax validation instantly.

View, explore, and prettify JSON data with syntax highlighting.

Test JSONPath expressions against your JSON with live results, normalized paths and clear syntax errors. Implements the RFC 9535 standard: filters, slices, recursive descent and functions. Runs in your browser.

Generate realistic fake JSON test data — names, emails, dates, prices, and more — with a field picker and an optional seed for reproducible results. Free and runs entirely in your browser.

Convert Tab Separated Values (TSV) to structured JSON data efficiently.

Transform structured XML data into the more flexible JSON format.

Convert YAML configuration files into standard JSON instantly in your browser. Ideal for feeding YAML config into JSON-only APIs or scripts.

Validate YAML syntax instantly in your browser and get a clear error message with line number if something's wrong. Free and private.

Beautify and pretty-print raw, minified CSS with proper indentation. Free and runs entirely in your browser.

Minify CSS online. Remove whitespace and comments, shorten colors and values and merge duplicate rules with csso. See the original, minified and gzipped size side by side. Runs in your browser, nothing is uploaded.

Beautify and pretty-print raw, minified HTML with proper indentation. Free and runs entirely in your browser.

Free HTML to Markdown converter. Paste HTML from a web page, CMS or email and get clean Markdown with headings, links, lists, code blocks and GitHub-flavoured tables. Runs in your browser.

Beautify and pretty-print raw, minified JavaScript with proper indentation. Free and runs entirely in your browser.

Minify JavaScript online with Terser. Remove comments and whitespace, mangle variable names and compress code, with options for ES modules, console removal and license comments. See original, minified and gzipped size. Runs in your browser.

Convert Markdown to HTML and HTML back to Markdown in real time with a live preview. 100% client-side, nothing you type is ever saved or tracked.

Beautify and pretty-print raw, minified SQL queries with proper indentation and keyword casing. Free and runs entirely in your browser.

Format XML with the indentation you choose, minify it, or validate that it is well-formed, with clear line and column error messages. Text content is never altered. Runs in your browser.

Generate a combined .gitignore file from common languages, frameworks, and editors with a simple checklist. Free and runs entirely in your browser.

Convert Unix file permissions between checkboxes, octal (755) and symbolic (rwxr-xr-x), handle setuid, setgid and sticky bits, apply chmod expressions like u+x,g-w and copy the command. Free.

Paste a 5-field cron expression and get a plain-English explanation plus the next 5 scheduled run times. Free and runs entirely in your browser.

Convert CSV or TSV into a GitHub-flavoured Markdown table with aligned columns and your choice of alignment, or convert a Markdown table back into CSV. Handles quotes, pipes and line breaks in cells. Runs in your browser.

Free CSV to SQL converter. Paste CSV and get a CREATE TABLE with inferred column types plus batched INSERT statements for PostgreSQL, MySQL, SQLite or SQL Server, with correct quoting and escaping.

Convert comma-separated values (CSV) into tab-separated values (TSV) instantly in your browser. Useful for pasting data into spreadsheet tools that expect tabs.

Build a properly shell-escaped curl command from a method, URL, headers, and request body. Free and runs entirely in your browser.

Free curl converter. Paste a curl command, for example from your browser's "Copy as cURL", and get equivalent code for JavaScript fetch, Python requests, Node.js axios or Go net/http, with headers, body, auth and cookies.

Free Excel to CSV converter. Open XLSX, XLS, XLSB or ODS files and export any sheet as CSV, TSV or JSON, or turn CSV data into an Excel .xlsx file. Files are processed in your browser and never uploaded.

View a file, text or hex bytes as a hex dump with offsets and an ASCII column, in the same layout as xxd. Search for text or bytes, jump to an offset, recognise common file types and copy or download the dump. Runs in your browser.

Convert tab-separated values (TSV) into comma-separated values (CSV) instantly in your browser. Useful for preparing spreadsheet exports for CSV-only import tools.

Quickly convert text to UPPER CASE, lower case, Sentence case, Capitalized Case, camelCase, PascalCase, or snake_case with our free online tool.

Find and replace text online with a live preview and match count. Supports plain text, regular expressions with capture groups, case matching and whole-word matching. Free and private.

Find hidden Unicode in text and code: zero-width spaces, bidirectional overrides, non-breaking spaces, control codes and mixed Latin/Cyrillic look-alike words. See each one and clean it. Free and private.

Randomly shuffle the lines of a pasted list using the Fisher-Yates algorithm. Free, fast, and runs entirely in your browser.

Free Lorem Ipsum generator for designers and developers. Create custom paragraphs, sentences, or words of placeholder text instantly.

Generate random words instantly for brainstorming, creative writing, or learning. Choose the number of words and word types with our free online tool.

Check how easy your writing is to read with Flesch Reading Ease, Flesch-Kincaid, Gunning Fog, SMOG, Coleman-Liau and ARI. Includes reading time. Free, private and instant.

Remove duplicate lines from any list, or show only the repeated or only the unique lines. Optional case-insensitive matching and whitespace trimming. Free and runs in your browser.

Quickly remove or replace line breaks in your text. Perfectly format text copied from PDFs, emails, or websites with our free online tool.

Test which versions satisfy an npm semver range such as ^1.2.3, ~1.2.3, 1.x or >=1.2 <2. See how npm reads the range, find the highest and lowest match, sort versions and bump a version. Runs in your browser.

Sort lines of text A to Z, Z to A, numerically, in natural order or by length. Optional case-insensitive sorting and empty-line removal. Free and runs in your browser.

Escape and unescape strings for JSON, JavaScript, Python, SQL, regular expressions, POSIX shell and CSV. Handles quotes, backslashes, newlines and Unicode. Free and runs in your browser.

Compare two blocks of text line by line and instantly see what was added, removed, or unchanged. Free and runs entirely in your browser.

Extract email addresses, URLs, IPv4 addresses, phone numbers, numbers, hashtags, @mentions or hex colours from any text. Remove duplicates and sort. Free and runs in your browser.

Normalize text to Unicode NFC, NFD, NFKC or NFKD, remove accents and invisible characters, compare two strings that look the same, and see every code point with its UTF-8 bytes and category. Runs in your browser.

Count words, characters, sentences, and paragraphs in real-time. Estimate reading and speaking time for your content with our free online tool.

Count how often each word or 2-3 word phrase appears in your text, with keyword density percentages and optional stop-word filtering in English, Spanish or French. Free and private.

Free AES text encryption tool. Encrypt a message with a password using AES-256-GCM and a PBKDF2-SHA-256 key (600,000 rounds), then decrypt it later with the same password. Runs entirely in your browser.

Generate bcrypt hashes with a cost factor from 4 to 14 and the $2a$, $2b$ or $2y$ prefix, and verify a password against an existing bcrypt hash. Runs in your browser; passwords are never sent.

Calculate MD5, SHA-1, SHA-256, SHA-384, SHA-512 and CRC-32 checksums of one or many files and compare them with a published value. The files stay on your device.

Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from any text, computed locally with the Web Crypto API. Free and runs entirely in your browser.

Generate HMAC-SHA1, SHA-256, SHA-384 and SHA-512 from a message and secret key, with hex or base64 output and a built-in check against an expected value. Runs in your browser; your key is never sent.

Decode a JWT's header and payload instantly and check its expiration, computed locally in your browser. Free, no signup, and your token is never sent to a server.

Free JWT generator and verifier. Create HMAC-signed JSON Web Tokens (HS256, HS384, HS512) from your own claims and secret, add iat and exp, or check a token's signature and expiry. Uses Web Crypto in your browser.

Free key pair generator. Create Ed25519, ECDSA (P-256, P-384) or RSA (2048-4096) key pairs with Web Crypto and export them as PEM (SPKI and PKCS#8) and as an OpenSSH public key with its SHA256 fingerprint. Keys never leave your browser.

Generate high-entropy, secure passwords instantly with our free online tool. Customize length and characters to protect your digital accounts.

Test JavaScript regular expressions in real time with live match highlighting, capturing group breakdowns, and instant replacement previews. 100% client-side.

Generate time-based one-time passwords (TOTP, RFC 6238) from a Base32 secret with a live countdown, make random secrets and otpauth:// QR codes, and test 2FA setups. Runs in your browser.

Decode UUIDs (versions 1 to 8) and ULIDs online. See the version, variant, embedded timestamp, clock sequence, node and random bits, and convert between UUID and ULID forms. Handles many IDs at once. Runs in your browser.

Generate cryptographically random RFC 4122 v4 UUIDs online, one at a time or in bulk. Free, fast, and runs entirely in your browser.