All tools

All 100 DevKit tools. Every one is free, needs no account, and does its work on your device.

• Word Counter Live word, character and reading-time stats.
• Case Converter UPPER, lower, Title, camelCase, snake_case and more.
• Lorem Ipsum Generator Placeholder text by words, sentences or paragraphs.
• Diff Checker Line-by-line diff of two text blocks via LCS.
• Text Cleaner Trim, collapse blanks, dedupe and sort lines of text.
• Regex Tester Test JavaScript regular expressions against your own text — matches, indices and capture groups.
• Markdown Previewer Live preview of a small Markdown subset — headings, bold, italic, code, links and lists.
• Slug Generator Turn any text into a lowercase, URL-safe slug — accents stripped, punctuation collapsed.
• Unicode Code Point Inspector Per-character code point, U+ hex value and UTF-8 byte length, including emoji outside the BMP.
• Word Frequency Analyzer Case-insensitive word counts, ranked most to least common.
• Regex Cheat Sheet Browsable reference of common regex patterns and syntax.
• Readability Score Calculator Flesch-Kincaid reading ease and grade level of your text.
• Text Truncator / Excerpt Generator Truncate text to a length at a word boundary, with an ellipsis.
• Find and Replace (Regex) Replace every regex match in text with a replacement pattern.
• JSON Formatter Pretty-print, minify and validate JSON.
• Base64 Encoder / Decoder Encode or decode Base64 with Unicode support.
• XML Formatter Pretty-print and validate XML, with clear errors on mismatched tags.
• JSON Path Evaluator Pull a value out of JSON with a simple dot/bracket path.
• CSS Beautifier / Minifier Beautify or minify CSS — string- and comment-aware.
• SQL Formatter Beautify SQL by keyword — SELECT, FROM, WHERE, JOIN and more.
• HTML Formatter Indent nested HTML tags, with void elements handled correctly.
• YAML ⇄ JSON Converter Convert YAML to JSON or JSON back to YAML.
• SVG Formatter / Minifier Pretty-print or minify SVG markup.
• JSON to TypeScript Converter Generate a TypeScript interface from a JSON sample.
• JSON Diff Checker Structural differences between two JSON documents.
• INI / Properties File Parser Convert INI or .properties key=value files to JSON and back.
• GraphQL Query Formatter Pretty-print a GraphQL query or mutation.
• .env File Parser Convert a .env file to JSON and back, comments and quotes intact.
• CSV Diff Checker Row-by-row and cell-by-cell differences between two CSV files.
• URL Encoder / Decoder Percent-encode or decode URLs and query strings.
• HTML Entity Encoder / Decoder Escape or unescape HTML entities like & and <.
• Base32 Encoder / Decoder Encode or decode RFC 4648 Base32 text.
• Hex ⇄ Text Converter Convert text to hexadecimal bytes and back.
• Binary ⇄ Text Converter Convert text to binary bytes and back.
• CSV ⇄ JSON Converter Convert CSV to JSON or JSON back to CSV, with proper quoted-field handling.
• Query String Parser & Builder Split a query string into key/value pairs, or build one from pairs.
• String Escape / Unescape Escape or unescape strings for JSON/JS literals or regex patterns.
• Punycode / IDN Converter Convert a domain name between Unicode and Punycode.
• File to Base64 Converter Convert any local file to a Base64 data URI.
• ROT13 / Caesar Cipher Shift letters by any amount — ROT13 and beyond.
• Morse Code Translator Convert text to Morse code and back.
• Base58 Encoder / Decoder Encode or decode Base58, the Bitcoin-address alphabet.
• Hash Generator Generate SHA-1, SHA-256, SHA-384 and SHA-512 hashes.
• HMAC Generator Generate keyed HMAC signatures with SHA-256/384/512.
• JWT Decoder Decode a JWT header and payload — no signature verification.
• Password Strength Checker Estimate password entropy and flag common weaknesses.
• Credit Card Number Validator Check a card number against the Luhn checksum.
• IBAN Validator Check an IBAN's shape and mod-97 checksum.
• JWT Encoder Build and sign a JWT with a header and payload.
• Basic Auth Header Encoder / Decoder Build or decode an HTTP Basic Authorization header.
• CRC32 Checksum Calculator Compute the CRC32 checksum of text or a file.
• Password Policy Checker Check a password against configurable length and character rules.
• URL Parser Break a URL into protocol, host, port, path, query and hash.
• User-Agent Parser Best-effort browser, OS and device type from a UA string.
• HTTP Status Code Reference Browsable table of HTTP status codes with lookup.
• CIDR / Subnet Calculator Network, broadcast, mask and usable host range from CIDR.
• IP Address Converter Convert IPv4 between decimal, integer, binary and hex.
• MAC Address Formatter Reformat a MAC address between colon, dash, dot and none.
• HTTP Header Parser Parse raw HTTP headers into a readable table.
• Sitemap Validator Check an XML sitemap against the sitemap protocol.
• DNS Record Type Reference Browsable reference of DNS record types and what each is for.
• User-Agent String Builder Build a realistic User-Agent string from browser, OS and device.
• MIME Type Lookup Look up the MIME type for a file extension, or the reverse.
• Bitwise Operations Calculator AND, OR, XOR, NOT, and bit shifts with binary display.
• Two's Complement Calculator Convert signed integers to two's complement binary and back.
• IEEE 754 Float Converter Convert decimals to IEEE 754 single/double-precision bits and back.
• ASCII Table Reference Full 7-bit ASCII table with character, hex, and control-code lookup.
• Levenshtein Distance Calculator Edit distance and similarity percentage between two strings.
• Number Formatter Add thousands separators or convert number formats.
• Prime Number Checker Check primality and list prime factors.
• GCD / LCM Calculator Greatest common divisor and least common multiple.
• Big-O Complexity Reference Browsable reference of common time-complexity classes.
• Matrix Calculator Add, multiply or find the determinant of small matrices.
• Combinatorics Calculator Permutations (nPr) and combinations (nCr) of n items.
• Color Converter Convert colors between HEX, RGB, HSL and CMYK.
• Color Contrast Checker Check WCAG AA/AAA contrast ratio between two colors.
• Color Shade Generator Generate a shade and tint ramp from any color.
• CSS Gradient Generator Build linear and radial CSS gradients from color stops.
• Color Palette Generator Complementary, triadic and analogous color schemes.
• CSS Box-Shadow Generator Build a CSS box-shadow with a live preview.
• CSS Clamp() Fluid Typography Calculator A responsive clamp() font-size from a min and max size.
• Color Blindness Simulator See how a color looks under common color vision deficiencies.
• Timestamp / Epoch Converter Convert Unix epoch seconds or milliseconds to a date, or a date to an epoch value.
• Date Format Converter Reformat a date using YYYY, MM, DD, HH, mm, ss tokens — always in UTC.
• ISO 8601 Duration Parser Parse a PnYnMnDTnHnMnS duration into years, months, days, hours, minutes and seconds.
• Cron Expression Parser & Explainer Parse a 5-field cron expression into plain English and see its next run times.
• Date Add / Subtract Calculator Add or subtract days, months or years from a date.
• Business Days Calculator Weekdays between two dates, weekends excluded.
• Meeting Time Overlap Finder Overlapping working hours across two or more time zones.
• Relative Time Formatter Format a timestamp as "3 hours ago" or "in 2 days".
• UUID / GUID Generator Random version-4 UUIDs, or the fixed nil UUID.
• ULID Generator Sortable, timestamp-prefixed unique IDs.
• Random String / Token Generator Alphanumeric, hex, base64url or numeric tokens of any length.
• Meta Tag & Open Graph Generator Title, description, Open Graph and Twitter Card tags.
• Fake Data Generator Mock rows of names, emails, phone numbers and IDs.
• Placeholder Image Generator An SVG placeholder image at any size, as a data URI.
• Cron Expression Builder Build a cron expression from a simple schedule.
• Markdown Table Generator Turn pasted CSV or tab-delimited data into a Markdown table.
• .gitignore Generator Assemble a .gitignore from common language and editor templates.
• License Text Generator Full open-source license text — MIT, Apache-2.0, GPL-3.0 and more.

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