Free Online Developer Tools

Lightning-fast utilities to format, decode, encode, and test your text strings and code snippets. No sign ups. No server latency. Just pure client-side performance.

Text Utilities Converters Formatters Security Design Text Formatting Data Decoding Data Encoding Data Extraction Generators

Text Utilities

Regex Tester

Test regular expressions with live match highlighting, capture groups, and flag toggles — debug your regex instantly. Free, client-side regex tester.

Text Diff Checker

Compare two blocks of text and see line-by-line differences highlighted instantly — additions and deletions color-coded. Free, client-side diff tool.

Word & Character Counter

Count words, characters, sentences, and paragraphs in real time as you type. Free, instant word counter for essays, meta descriptions, and tweets.

Word Frequency Counter

Find which words repeat most in your text and how often. Free keyword density checker with a stopword filter — spot overused words before you publish.

Uppercase Converter

Convert text to ALL CAPS or flip to lowercase with one toggle — paste, convert, and copy in one click. Free, client-side case converter with no sign-up.

Lowercase Converter

Make text all lowercase or flip to ALL CAPS with one toggle — normalise emails, slugs, and ALL-CAPS text instantly. Free, client-side lowercase converter.

Remove Whitespace

Remove all whitespace from text — strips every space, tab, and newline from any string instantly. Free, client-side whitespace remover, no sign-up.

Remove Line Breaks

Merge multi-line text into one continuous line — removes all line breaks and carriage returns instantly. Perfect for cleaning text copied from PDFs.

Reverse Text

Reverse any text instantly — flips the order of every character to create backwards or mirrored strings. Free, client-side reverse text generator.

List Sorter (Alphabetic)

Sort a multi-line list alphabetically A-to-Z — paste lines and get them sorted instantly. Free, client-side list sorter for names and keywords.

List Shuffler

Randomize the order of lines in a list — shuffle names, raffle entries, or quiz questions with a fair Fisher-Yates shuffle. Free and client-side.

Spaces to Tabs

Convert space indentation to tabs — replaces every 4 spaces with a tab character instantly. Free, client-side indentation converter for code.

Tabs to Spaces

Convert tab indentation to spaces — replaces every tab with 4 spaces instantly for consistent code style. Free, client-side untabify converter.

Strip Punctuation

Remove all punctuation marks from text instantly — strip periods, commas, symbols and more for clean word lists. Free, client-side punctuation remover.

Remove Numbers

Delete every numeric digit from your text instantly — clean IDs, timestamps, and stray numbers out of any string. Free, client-side number remover.

Single Spaces

Collapse multiple consecutive spaces into single spaces instantly — fix double spacing and messy copy-pasted text. Free, client-side space fixer.

Reverse Words

Reverse the order of words in a sentence instantly — the last word becomes first while spelling stays intact. Free, client-side word order reverser.

Shuffle Letters

Randomly scramble the letters inside each word of your text — generate puzzles and anagram material instantly. Free, client-side letter shuffler.

Count Vowels

Count every vowel (a, e, i, o, u) in your text instantly — quick frequency stats for linguistics, puzzles, and homework. Free and client-side.

Count Consonants

Count every consonant in your text instantly — quick letter frequency stats for word games, linguistics, and text analysis. Free and client-side.

Sort Lines by Length

Sort text lines from shortest to longest instantly — order lists by character count for readability or analysis. Free, client-side length sorter.

Strip Special Chars

Remove all special characters from text — keep only letters, numbers, and spaces for clean identifiers. Free, instant, client-side text cleaner.

Hide Vowels

Replace every vowel in your text with an asterisk instantly — create fill-in-the-blank puzzles and word games. Free, client-side vowel hider tool.

Sort Length Desc

Sort text lines from longest to shortest instantly — order lists by descending character count in one click. Free, client-side length sorter tool.

Remove Vowels

Delete every vowel from your text instantly — generate disemvoweled text for puzzles and abbreviations. Free, instant, client-side vowel remover.

Lines to Comma List

Convert newline-separated values into a comma-separated list instantly — turn columns into CSV-ready rows. Free, client-side list converter tool.

Converters

Epoch Timestamp Converter

Convert Unix epoch timestamps to human dates and back — seconds or milliseconds, UTC and local time, with a live clock. Free and 100% client-side.

Cron Expression Parser

Parse any cron expression into plain English and preview its next five run times instantly — debug crontab schedules with confidence. Free, client-side.

Base64 Encoder/Decoder

Encode text to Base64 or decode Base64 strings back to plain text instantly. Free, client-side converter that handles JWT payloads and data URIs.

URL Encoder

URL encode any string, or flip to decode — converts spaces, special characters, and Unicode into percent-encoded URI format instantly. Free, client-side.

URL Decoder

Decode percent-encoded URLs back to plain text, or flip to encode — converts %20, %26, %3D and all URI escape sequences instantly. Free, client-side.

Base64 URL Safe Encoder

Encode text to URL-safe Base64 — replaces + with - and / with _ so output is safe in URLs and JWT tokens. Free, instant, client-side encoder.

Binary to Hex

Convert a binary stream to hexadecimal instantly — every 4 bits become one hex digit, whitespace ignored. Free, client-side binary to hex converter.

Hex to Binary

Convert hexadecimal to a binary stream instantly — every hex digit expands to 4 binary bits, clearly grouped. Free, client-side hex to binary tool.

JSON to URL Params

Convert a flat JSON object into a URL query string instantly — build parameter strings for GET requests and APIs. Free, instant, and client-side.

URL Params to JSON

Parse a URL query string into a formatted JSON object instantly — inspect GET parameters and form data at a glance. Free, instant, client-side.

Unix Time to Date

Paste a whole list of Unix timestamps and get ISO dates back, one per line — handles seconds and milliseconds automatically, mixed together. Free, client-side bulk epoch converter.

Text to SQL IN

Format a list of values into a quoted SQL IN() clause instantly — with single quotes escaped safely. Free, client-side SQL IN list generator.

URL Parser

Paste a full URL and instantly see its protocol, host, port, path, every query parameter, and hash — all broken out separately. Free, client-side URL parser.

cURL Command Builder

Build a properly-escaped curl command from a method, URL, headers, and body — no more hand-quoting shell syntax. Free, client-side curl builder.

Formatters

JSON Formatter & Validator

Format, validate, and beautify JSON data instantly. Paste minified JSON and get readable, indented output in one click — free and 100% client-side.

CSV to JSON Converter

Convert CSV data into a structured JSON array — paste comma-separated rows and get formatted JSON instantly. Free, client-side CSV to JSON converter.

JSON to CSV Converter

Convert a JSON array of objects into CSV rows instantly — paste JSON, get spreadsheet-ready CSV with proper comma and quote escaping. Free, client-side.

JSON Minifier

Minify JSON by stripping all whitespace — reduce payload size for faster API responses and smaller files. Free, instant, client-side JSON minifier.

CSS Minifier

Minify CSS online — strip whitespace and compress stylesheets for smaller files and faster page loads. Free, instant, client-side CSS minifier.

CSS Beautifier

Reformat minified or compressed CSS into readable, indented code instantly — the reverse of minifying. Free, client-side CSS beautifier and unminify tool.

JSON Diff Checker

Compare two JSON objects and see exactly which keys were added, removed, or changed — ignores whitespace and key order. Free, client-side JSON diff tool.

Security

Hash Generator

Generate MD5, SHA-1, SHA-256 and SHA-512 hashes instantly in your browser. Free client-side checksum calculator — your text never leaves your device.

HTML Entity Encoder

Escape HTML characters online — encode <, >, & and quotes into safe HTML entities to prevent XSS and display code snippets. Free and client-side.

Secure Password Generator

Generate strong, random passwords from 8 to 64 characters with uppercase, lowercase, number, and symbol toggles — cryptographically secure, created in your browser.

JWT Decoder

Decode JWT tokens to view the header and payload instantly — inspect claims without verifying the signature. Free, client-side JWT decoder viewer.

ROT13 Encoder/Decoder

Encode or decode ROT13 text instantly — the classic Caesar substitution cipher that is its own inverse. Free, client-side ROT13 cipher translator.

JWT Generator

Build and sign a real JWT from a custom header, payload, and HS256 secret — the missing companion to the JWT Decoder. Free, client-side JWT generator.

Design

Color Converter

Convert HEX, RGB, HSL and RGB to CMYK instantly — free, client-side color code converter with CSS-ready output for web designers.

Lorem Ipsum Generator

Generate lorem ipsum placeholder text by words, paragraphs, or an exact character count. Free, instant dummy text generator for mockups, themes, and page layouts.

Text Formatting

Title Case Converter

Convert text to Title Case — capitalizes the first letter of every word for headlines, titles, and headings. Free, instant, client-side converter.

Camel Case Converter

Convert text to camelCase — the naming convention for JavaScript variables, functions, and JSON keys. Free, instant, client-side case converter.

Snake Case Converter

Convert text to snake_case — the standard for Python variables, database columns, and file names. Free, instant, client-side snake case converter.

Kebab Case Converter

Convert text to kebab-case online — the standard for CSS class names, HTML attributes, and URL slugs. Free, instant, client-side case converter.

Alternate Case

Convert text to aLtErNaTiNg case instantly — the sponge/mocking text style with every other letter capitalized. Free, client-side case generator.

Sentence Case

Convert text to sentence case — capitalizes the first letter of each sentence and lowercases the rest. Free, instant, client-side case converter.

Dot Case

Convert text to dot.case — words joined with periods, as used for config keys and object paths. Free, instant, client-side dot case converter.

Path Case

Convert text to path/case — words joined with forward slashes for file paths and URL segments. Free, instant, client-side path case converter.

Add Line Numbers

Prefix every line of text with its line number instantly — perfect for code listings, transcripts, and references. Free, client-side numbering tool.

Remove Line Numbers

Strip leading numbers from every line — clean up numbered lists, code listings, and transcripts instantly. Free, client-side line number remover.

Quote Lines

Add a "> " quote prefix to every line of text instantly — format email replies and Markdown blockquotes in one click. Free, client-side quoting tool.

Slugify Text

Turn any text into a clean, lowercase URL slug instantly — spaces become hyphens, special characters removed. Free, client-side slug generator.

Deslugify URL

Convert a URL slug back into readable Title Case text instantly — hyphens become spaces, words re-capitalized. Free, client-side slug converter.

Swap Case

Toggle the case of every letter — capitals become lowercase and lowercase becomes capitals, instantly. Free, client-side swap case (inverse case) converter.

Randomize Case

Randomly mix uppercase and lowercase letters throughout your text instantly — chaotic case for memes and testing. Free, client-side case randomizer.

Data Decoding

Hex to Text

Decode hexadecimal bytes back to readable ASCII text — paste hex values and get plain text instantly. Free, client-side hex decoder with no sign-up.

Binary to Text

Decode binary code back to readable text — paste space-separated 8-bit groups and get plain text instantly. Free, client-side binary decoder.

HTML Entity Decoder

Decode HTML entities back to readable characters — converts <, &, " and all escape codes instantly. Free, client-side HTML unescaper.

ASCII Codes to String

Convert space-separated ASCII code values back to readable text instantly — with validation of the 0–127 range. Free, client-side ASCII decoder.

Octal to String

Convert octal values back to readable text instantly — with validation that flags invalid digits. Free, instant, client-side octal to text decoder.

Morse Code Decoder

Decode Morse code back to plain text instantly — paste dots, dashes, and slashes and get readable letters and digits. Free, client-side Morse decoder.

Base32 Decoder

Decode Base32 text back to readable characters instantly — the standard RFC 4648 format used by TOTP/2FA secret keys. Free, client-side Base32 decoder.

Data Encoding

Text to Hex

Convert any text to hexadecimal — encodes every character to its two-digit hex byte value instantly. Free, client-side hex encoder with no sign-up.

Text to Binary

Convert text to binary code — translates every character into its 8-bit binary representation instantly. Free, client-side binary translator.

String to ASCII Codes

Convert every character of a string to its ASCII code value instantly — get space-separated decimal codes. Free, client-side ASCII code converter.

String to Octal

Convert text to octal representation — every character encoded as a three-digit octal value instantly. Free, instant, client-side octal encoder.

String to Decimal

Convert every character of text to its decimal character code instantly — space-separated values for debugging. Free, client-side decimal encoder.

String to Morse Code

Translate text to international Morse code instantly — letters and digits become dots and dashes, spaces become slashes. Free and client-side.

Base32 Encoder

Encode text to Base32 instantly using the standard RFC 4648 alphabet — the format behind TOTP/2FA secret keys. Free, client-side Base32 encoder.

Data Extraction

Email Extractor

Extract all email addresses from any block of text — paste content and get a clean, one-per-line list of emails instantly. Free and client-side.

URL Extractor

Extract all URLs from any text — finds every http and https link and outputs them one per line instantly. Free, client-side link extractor tool.

Remove Duplicate Lines

Remove duplicate lines from any list — keeps the first occurrence of each unique line and preserves order. Free, instant, client-side deduplicator.

Strip HTML Tags

Remove all HTML tags from text and keep the plain content — clean up scraped pages or rich-text exports instantly. Free, client-side HTML stripper.

Extract Numbers

Pull every number out of a block of text — get all integers as a clean one-per-line list instantly. Free, instant, client-side number extractor.

Extract IPv4 Addresses

Find every IPv4 address in a block of text — extract IPs from logs, configs, and reports as a clean list. Free, instant, client-side IP extractor.

Extract MAC Addresses

Find every MAC address in a block of text — extract hardware addresses from logs and network configs instantly. Free, client-side MAC extractor.

MAC Address Vendor Lookup

Look up a MAC address's manufacturer from its OUI prefix instantly — free, client-side vendor lookup covering major hardware and IoT chip makers.

Extract Dates

Find all YYYY-MM-DD and MM/DD/YYYY dates in any text — extract dates from logs and documents as a clean list instantly. Free and client-side.

Extract Hex Colors

Find every #HEX color code in text or CSS — extract a palette from any stylesheet or document instantly. Free, client-side color code extractor.

User Agent Parser

Paste any browser user agent string and instantly see its browser, version, operating system, device type, and rendering engine. Free, client-side UA parser.

Generators

UUID/GUID v4 Generator

Generate random UUID v4 strings instantly — cryptographically secure unique identifiers for databases, APIs, and testing. Free and client-side.

Random Number Generator

Generate a random integer in any range you choose — 1 to 100, 1 to 10, or any custom min/max. Free, instant, client-side random number generator, no sign-up.

MAC Address Generator

Generate a random MAC address in standard colon-separated format instantly — ideal for network testing and mock data. Free and client-side.

IPv4 Address Generator

Generate a random IPv4 address instantly — realistic dotted-quad test data for network tools and fixtures. Free, client-side IP address generator.

IPv6 Address Generator

Generate a random IPv6 address instantly — full eight-group hexadecimal test data for modern network testing. Free, client-side IPv6 generator.

Fake Name Generator

Generate random realistic fake names instantly — first and last name combinations for test data and demos. Free, client-side fake name generator.

Fake Email Generator

Generate a random dummy email address on the example.com test domain instantly — safe placeholder data for forms. Free, client-side email generator.

Random Phone Number Generator

Generate random fake US phone numbers instantly — realistic 10-digit test data for forms and databases. Free, client-side phone number generator.

Random Hex Color Generator

Generate a random #HEX color code instantly — discover new palette ideas or create test values for CSS. Free, client-side random color generator.

Random RGB Color Generator

Generate a random rgb() color value instantly — CSS-ready random colors for design experiments and testing. Free, client-side RGB color generator.

Random Date Generator

Generate a random date from the last two years instantly — ISO-formatted test data for fixtures and demos. Free, client-side random date generator.

Coin Flip Simulator

Flip a virtual coin online — get heads or tails instantly with fair 50/50 randomness for quick decisions. Free, client-side coin flip simulator.

Dice Roll (1-6)

Roll a virtual 6-sided die online — get a fair random result from 1 to 6 instantly for games and decisions. Free, client-side dice roll simulator.

2 Dice Roll (2d6)

Roll two virtual 6-sided dice at once — instant 2d6 results for board games and tabletop RPGs. Free, client-side double dice roll simulator.

4-Digit PIN Generator

Generate a random 4-digit PIN code instantly — adjust the length from 3 to 8 digits if you need something different. Free, client-side, cryptographically random PIN generator.

6-Digit PIN Generator

Generate a random 6-digit PIN code instantly — OTP-style numeric codes for testing and mock verification flows, with an adjustable 3-8 digit length. Free, client-side, cryptographically random PIN generator.

Random 16-char String

Generate a random 16-character alphanumeric string instantly — quick tokens, test keys, and identifiers. Free, client-side random string generator.

Random Base64 String

Generate a random 32-byte Base64-encoded string instantly — mock tokens and keys for development and testing. Free, client-side Base64 generator.

Random Hex String Generator

Generate a cryptographically secure random hex string — 16 to 64 bytes, the same output as openssl rand -hex, right in your browser. Free and client-side.

UUID v1 Generator

Generate a mock time-based UUID v1 string instantly — timestamp-style identifiers for testing and demos. Free, client-side UUID v1 generator.

HTTP 200 OK Mock

Generate a mock HTTP 200 OK JSON response instantly — realistic success payloads for stubs and API tests. Free, client-side mock API generator.

Fake User Agent Generator

Generate a random modern browser user agent string instantly — Chrome, Safari, and Firefox formats for testing. Free, client-side UA generator.

Random ISBN-13 Generator

Generate a mock ISBN-13 book number instantly — realistic 978-prefixed identifiers for catalog testing. Free, client-side mock ISBN generator.