Free Online Tools for Text, JSON, CSV, Developers and SEO

Topic pages collect the tools used together on one job, across categories — JSON work, for instance, spans conversion, formatting and extraction.

• JSON Tools Format, validate, convert and query JSON without leaving the browser.
• CSV Tools Convert, reshape and inspect delimited data without a spreadsheet.
• XML Tools Format, check and convert XML documents safely.
• Hash Tools Generate and compare cryptographic digests.
• Web Development Tools Format, minify and look up the details of front-end work.
• API Tools Inspect the payloads, tokens, headers and URLs an API exchanges.
• SEO Tools Check the technical and on-page details that affect ranking.

Count, clean, reformat and analyse written text.

• Character Counter Count characters with and without spaces, live as you type. In your browser
• Word Counter Count words, sentences and paragraphs while you write. In your browser
• Line Counter Count total, non-empty and unique lines in any list. In your browser
• Sentence Counter Count sentences and see the average sentence length. In your browser
• Paragraph Counter Count paragraphs and check their average length. In your browser
• Case Converter Switch text between upper, lower, title, sentence and code cases. In your browser
• Remove Duplicate Lines Strip repeated lines from a list and keep the order. In your browser
• Sort Lines Sort a list alphabetically, numerically, by length or at random. In your browser
• Reverse Text Reverse characters, words or the order of lines. In your browser
• Text Repeater Repeat a string or block of text a set number of times. In your browser
• Text Cleaner Strip formatting, smart quotes and invisible characters. In your browser
• Whitespace Remover Collapse spaces, replace tabs and drop blank lines. In your browser
• Find and Replace Replace text everywhere, with optional regex support. In your browser
• Text Difference Checker Compare two versions of a text and see what changed. In your browser
• Lorem Ipsum Generator Generate placeholder paragraphs, sentences or words. In your browser
• Slug Generator Turn any title into a clean, URL-safe slug. In your browser
• Reading Time Calculator Estimate how long an article takes to read or speak aloud. In your browser
• Keyword Density Checker See which words and phrases dominate your copy. In your browser
• Prefix and Suffix Tool Add text to the start or end of every line at once. In your browser
• List Comparison Find what two lists share and what only one of them has. In your browser
• Readability Checker Score how hard your writing is to read. In your browser
• Text Wrap Rewrap text to a fixed line width, with an optional prefix. In your browser

Move data between CSV, JSON, XML, YAML and TSV.

• CSV to JSON Converter Turn CSV rows into a clean JSON array of objects. In your browser
• JSON to CSV Converter Flatten a JSON array into spreadsheet-ready CSV. In your browser
• XML to CSV Converter Flatten repeating XML records into a CSV table. In your browser
• CSV to XML Converter Build well-formed XML records from CSV rows. In your browser
• XML to JSON Converter Convert any XML document into readable JSON. In your browser
• JSON to XML Converter Convert JSON objects and arrays into well-formed XML. In your browser
• YAML to JSON Converter Convert YAML configuration into equivalent JSON. In your browser
• JSON to YAML Converter Turn JSON into readable, correctly quoted YAML. In your browser
• TSV to CSV Converter Convert tab-separated data to comma-separated CSV. In your browser
• CSV to TSV Converter Convert comma-separated data to tab-separated values. In your browser
• Excel Column Converter Convert between column letters (AB) and column numbers (28). In your browser
• Markdown to HTML Converter Convert Markdown into clean, safe HTML source. In your browser
• CSV Column Extractor Keep only the columns you need from a CSV file. In your browser
• CSV Duplicate Remover Remove repeated rows from a CSV, by whole row or by key columns. In your browser
• CSV Sorter Sort CSV rows by one or more columns without a spreadsheet. In your browser
• HTML to Text Converter Extract readable plain text from HTML, keeping the structure. In your browser
• CSV to Markdown Table Turn a spreadsheet export into a Markdown table. In your browser
• JSON to SQL Converter Turn a JSON array into INSERT statements. In your browser
• HTML Table to CSV Pull a table out of a web page and turn it into CSV. In your browser

Format, validate, minify, hash, decode and generate.

• JSON Formatter Beautify, validate and sort JSON with precise error messages. In your browser
• JSON Validator Check whether JSON is valid and see exactly where it breaks. In your browser
• JSON Minifier Strip whitespace from JSON and see the size saved. In your browser
• XML Formatter Indent XML so nested documents become readable. In your browser
• XML Validator Check that an XML document is well-formed. In your browser
• SQL Formatter Reformat dense SQL into readable, indented statements. In your browser
• HTML Formatter Indent HTML and make nested markup readable. In your browser
• HTML Minifier Shrink HTML by removing whitespace and comments. In your browser
• CSS Formatter Expand minified CSS into readable, indented rules. In your browser
• CSS Minifier Compress CSS by removing whitespace and comments. In your browser
• JavaScript Formatter Re-indent JavaScript so minified code becomes readable. In your browser
• JavaScript Minifier Strip comments and whitespace from JavaScript safely. In your browser
• UUID Generator Generate random v4 or time-ordered v7 UUIDs in bulk. In your browser
• Regex Tester Test a regular expression and see every match highlighted. In your browser
• Unix Timestamp Converter Convert between Unix timestamps and human dates. In your browser
• Text to Binary Converter Convert text to binary, hex, octal or decimal and back. In your browser
• JWT Decoder Read a JSON Web Token header, payload and expiry. In your browser
• Color Converter Convert colours between HEX, RGB, HSL and HSV. In your browser
• HTTP Status Code Reference Search every HTTP status code and what it means. In your browser
• MIME Type Lookup Find the MIME type for any file extension, and back. In your browser
• QR Code Generator Create a downloadable QR code from a link or text. Server-side
• JSON Diff Compare two JSON documents and see exactly what changed. In your browser
• JSON Flatten Turn nested JSON into a flat map of dot-separated paths. In your browser
• JSON Unflatten Rebuild nested JSON from a flat map of dot-separated paths. In your browser
• JSON Merge Combine two JSON documents, with control over how arrays behave. In your browser
• JSON Escape and Unescape Escape text for use inside a JSON string, or decode it back. In your browser
• NDJSON Formatter Convert between NDJSON line-delimited records and a JSON array. In your browser
• JSON to TypeScript Generate TypeScript interfaces from a sample JSON payload. In your browser
• URL Parser Split a URL into its scheme, host, path, query and fragment. In your browser
• Query String Parser Decode a query string into a readable table of parameters. In your browser
• HTTP Header Parser Turn a raw header block into a readable table. In your browser
• Cron Expression Parser Explain a cron expression in plain English and show its next runs. In your browser
• Number Base Converter Convert numbers between any bases from 2 to 36. In your browser
• Email Address Validator Check a list of email addresses for syntax errors. In your browser
• Random Number Generator Generate random whole numbers in a range you choose. In your browser
• UUID Validator Check UUIDs and identify which version each one is. In your browser
• JSON Schema Validator Check a JSON document against a JSON Schema and see every failure. In your browser
• JSON Tree Viewer Explore a large JSON document as a collapsible tree. In your browser
• Cron Expression Generator Build a cron expression from a schedule, and see when it will run. In your browser
• Meta Tag Generator Generate the meta, Open Graph and Twitter tags for a page. In your browser
• robots.txt Generator Build a valid robots.txt, with or without the AI crawlers. In your browser

Pull emails, URLs, numbers and dates out of messy text.

• Email Extractor Pull every email address out of a block of text. In your browser
• URL Extractor Find every link in text or HTML. In your browser
• Phone Number Extractor Find phone numbers in international and local formats. In your browser
• Number Extractor Pull numbers out of text, with a running total. In your browser
• Hashtag Extractor Collect hashtags and mentions from social copy. In your browser
• Domain Extractor Extract unique domains from URLs, emails or logs. In your browser
• IP Address Extractor Find IPv4 and IPv6 addresses in logs and text. In your browser
• Date Extractor Find dates written in any common format. In your browser
• JSON Path Extractor Pull specific values out of a JSON document by path. In your browser
• Extract Text Between Pull out every piece of text sitting between two markers. In your browser

Inspect DNS, IP addresses, headers and redirects.

• IP Address Lookup See the network, organisation and approximate location of an IP. Server-side
• DNS Lookup Query A, AAAA, MX, NS, TXT, CNAME, SOA and SRV records. Server-side
• HTTP Header Checker Inspect the response headers and status a URL returns. Server-side
• URL Redirect Checker Follow a redirect chain and see every hop. Server-side
• My IP Address See the public IP address and user agent you connect with. Server-side
• User-Agent Parser Decode a user-agent string into browser, engine and platform. In your browser
• Browser Information See what your browser reveals about your device. In your browser
• Screen Resolution Checker Check your screen size, viewport and pixel ratio. In your browser
• Subnet Calculator Work out the network, broadcast and usable host range for a CIDR block. In your browser

Encode, hash, sign and generate strong secrets.

• Base64 Encoder and Decoder Encode text to Base64 or decode it back, including URL-safe. In your browser
• URL Encoder and Decoder Percent-encode text for URLs, or decode it back. In your browser
• HTML Entity Encoder and Decoder Escape HTML special characters, or decode entities back. In your browser
• Hash Generator Generate MD5, SHA-1, SHA-256 and SHA-512 digests at once. In your browser
• MD5 Hash Generator Generate an MD5 checksum from any text. In your browser
• SHA-1 Hash Generator Generate a SHA-1 digest from any text. In your browser
• SHA-256 Hash Generator Generate a SHA-256 digest — the modern default. In your browser
• SHA-512 Hash Generator Generate a 512-bit SHA-2 digest. In your browser
• HMAC Generator Sign a message with a secret key using HMAC. In your browser
• Password Generator Create strong random passwords or memorable passphrases. In your browser
• Password Strength Checker Estimate how long a password would take to crack. In your browser
• Bcrypt Generator and Verifier Create and verify bcrypt password hashes. Server-side
• Unicode Escape and Unescape Convert characters to \uXXXX escapes and back. In your browser
• Data URI Encoder Turn an SVG or snippet into an embeddable data: URI. In your browser