Developer Toolkit

Free online tools for developers & IT teams

87+ browser-based utilities for hashing, encoding, formatting, networking, and everyday calculations. Nothing you type ever leaves your device.

87 tools found

Hash Generator

Turn any text into an MD5, SHA-1, SHA-256, SHA-384, SHA-512 or SHA-3 digest.

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Bcrypt Generator

Hash a password with bcrypt and verify it against an existing hash.

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HMAC Generator

Compute an HMAC signature from a message and secret key using SHA-256, SHA-512, SHA-1 or MD5.

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RSA Key Pair Generator

Generate a fresh RSA public/private key pair in PEM format at 1024, 2048 or 4096 bits.

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Text Encrypt / Decrypt

Encrypt or decrypt a message with AES, Triple DES, Rabbit or RC4 using a passphrase.

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BIP39 Mnemonic Generator

Generate a 12–24 word BIP39 recovery phrase, or derive a seed from an existing mnemonic.

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Password Strength Analyser

Score a password and see estimated crack times across several attack scenarios.

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Random Token Generator

Generate cryptographically random strings with a custom length and character set.

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TOTP Code Generator

Generate live TOTP codes from a Base32 secret, compatible with Google Authenticator and Authy.

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Basic Auth Header Generator

Turn a username and password into an HTTP Basic Authentication header.

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String Obfuscator

Lightly obfuscate a string using hex escapes, Unicode escapes, Base64, char codes, ROT13 or XOR.

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JWT Decoder

Decode a JSON Web Token to inspect its header, payload claims, and expiry status.

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PDF Signature Inspector

Upload a PDF to detect digital signatures and inspect the signer, date, and algorithm.

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Base64 Text Encoder / Decoder

Encode text to Base64 or decode Base64 back to plain text, with full UTF-8 support.

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File to Base64 Converter

Convert any file to a Base64 string, or turn a Base64 string back into a downloadable file.

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URL Encoder / Decoder

Percent-encode text for safe use in a URL, or decode a percent-encoded string back to plain text.

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HTML Entity Encoder / Decoder

Escape special characters to HTML entities, or unescape entities back to readable text.

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Text to Binary Converter

Convert text to 8-bit ASCII binary, or decode space-separated binary back to text.

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Text to Unicode Converter

Convert text to Unicode code points (U+XXXX) and decode code points back to characters.

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Number Base Converter

Convert integers between decimal, binary, octal, hexadecimal and other bases.

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Roman Numeral Converter

Convert numbers to Roman numerals and Roman numerals back to integers, in either direction.

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JSON Formatter

Format and indent JSON with 2 spaces, 4 spaces, or tabs — with instant validation.

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JSON Minifier

Strip every unnecessary whitespace character from JSON for the smallest valid payload.

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JSON Comparer

Compare two JSON objects and see exactly which keys were added, removed, or changed.

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JSON to YAML Converter

Convert a JSON document into clean, indented YAML.

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JSON to TOML Converter

Convert JSON objects into TOML configuration format.

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JSON to CSV Converter

Convert a JSON array of objects into CSV, with auto-detected headers and a choice of delimiter.

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JSON to XML Converter

Convert JSON into XML markup, with @_ prefixed keys becoming attributes.

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YAML to JSON Converter

Convert a YAML document into pretty-printed JSON.

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YAML to TOML Converter

Convert YAML config files into TOML format.

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YAML Formatter

Format and validate YAML with consistent indentation, normalizing inline flow-style mappings.

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TOML to JSON Converter

Convert TOML config files into pretty-printed JSON.

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TOML to YAML Converter

Convert TOML configuration files into YAML format.

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XML to JSON Converter

Convert XML documents into JSON, preserving attributes and nested nodes.

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XML Formatter

Indent and prettify XML documents with 2 spaces, 4 spaces, or tabs.

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SQL Formatter

Format SQL queries with uppercase keywords and clean line breaks.

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Markdown to HTML Converter

Convert Markdown into HTML instantly, with a live preview alongside the source.

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Text Case Converter

Transform text between camelCase, PascalCase, snake_case, kebab-case, Title Case and more at once.

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NATO Phonetic Alphabet Converter

Convert text into the NATO phonetic alphabet (Alpha, Bravo, Charlie…) for clear spoken communication.

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Lorem Ipsum Generator

Generate placeholder text by paragraph, sentence, or word count.

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Text Analyzer

Analyze text for character, word, sentence and paragraph counts, reading time, and word frequency.

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Text Comparison Tool

Compare two text blocks line by line, with additions and removals highlighted.

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List Format Converter

Convert a list between JSON array, CSV, bullet list, numbered list, SQL IN clause, and TSV.

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Slug Generator

Convert any title or phrase into a clean, URL-friendly slug.

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Rich Text to HTML Editor

Edit rich text visually and copy the generated HTML markup.

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Numeronym Generator

Convert long words into numeronyms like i18n, k8s, and a11y.

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ASCII Text Art Generator

Render text as ASCII art banners using a bitmap font, with adjustable fill character and spacing.

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Emoji Search & Picker

Search and copy emojis by name, or browse them by category.

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Regex Tester

Test a regular expression against a string in real time, with match and capture group highlighting.

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Regex Syntax Reference

Quick reference for regex anchors, character classes, quantifiers, groups, and flags.

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IPv4 Subnet Calculator

Calculate network address, broadcast, host range, and subnet mask from CIDR notation.

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IPv4 Address Converter

Convert IPv4 addresses between dotted decimal, hexadecimal, 32-bit integer, and binary.

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IPv4 Range Expander

List every IP address between a start and end IPv4 address.

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IPv6 ULA Generator

Generate a random IPv6 Unique Local Address with the fd::/8 prefix.

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MAC Address Vendor Lookup

Look up the hardware vendor from a MAC address OUI prefix, entirely offline.

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Random MAC Address Generator

Generate random MAC addresses for testing, with control over format, unicast/multicast, and scope.

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Random Port Generator

Generate random port numbers in system, registered, or ephemeral ranges.

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Safelink URL Decoder

Decode Microsoft Outlook Safelinks and Proofpoint URLDefense links to reveal the real destination.

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URL Parser

Break down any URL into protocol, hostname, port, path, query parameters, and hash fragment.

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User-Agent Parser

Parse a user agent string to detect browser, operating system, device type, and rendering engine.

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HTTP Status Code Reference

A searchable, color-coded reference for every HTTP status code.

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MIME Type Lookup

Search MIME types by file extension or type string, across 50 common formats.

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Email Address Normalizer

Normalize Gmail, Yahoo, and Outlook addresses to their canonical form to catch duplicate accounts.

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Phone Number Parser

Parse international phone numbers into country, dial code, E.164 format, and local format.

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IBAN Validator

Validate an IBAN using the ISO 7064 MOD-97-10 checksum and inspect its country and BBAN.

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UUID Generator

Generate UUIDs in v1 (timestamp-based) or v4 (random) format, up to 100 at once.

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ULID Generator

Generate Universally Unique Lexicographically Sortable Identifiers with an embedded timestamp.

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QR Code Generator

Generate a QR code for any URL or text, and download it as a PNG.

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WiFi QR Code Generator

Create a scannable QR code for your WiFi network so guests can connect without typing the password.

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SVG Placeholder Generator

Generate custom SVG placeholder images with any dimensions, colors, and label text.

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Open Graph Meta Tag Generator

Generate Open Graph and Twitter Card meta tags for rich social media link previews.

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Cron Expression Builder

Build cron expressions visually, with preset schedules and a human-readable description.

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Docker Run to Compose Converter

Convert a docker run command into a docker-compose.yml file.

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Chmod Permission Calculator

Toggle read, write, and execute permissions for owner, group, and others to build a chmod command.

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Git Command Reference

A searchable reference of common Git commands, filterable by category.

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JavaScript Benchmark Builder

Compare JavaScript snippet performance in the browser and see operations-per-second.

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Keyboard Event Inspector

Press any key to see its full JavaScript keyboard event properties.

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Browser & Device Inspector

See what your browser exposes: user agent, screen resolution, CPU cores, memory, and connection type.

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Framer Site HTML Exporter

Export a published Framer site into downloadable HTML markup from a single link.

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Webcam Recorder

Record video from your webcam directly in the browser and download it as WebM.

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Math Expression Evaluator

Evaluate arithmetic, trigonometric, and logarithmic expressions with a running history.

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ETA Calculator

Estimate time remaining for batch jobs, uploads, or migrations from progress and elapsed time.

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Percentage Calculator

Four ways to work with percentages: percentage of a number, what percent X is of Y, percentage change, and adding a percent.

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Online Stopwatch

A browser stopwatch with centisecond precision, lap times, and pause/resume.

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Temperature Converter

Convert temperatures across Celsius, Fahrenheit, Kelvin, Rankine, Delisle, Newton, Réaumur, and Rømer.

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Color Format Converter

Convert colors between HEX, RGB, and HSL with a live color preview.

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Date & Timestamp Converter

Convert between ISO 8601, Unix timestamps (seconds/ms), UTC, RFC 2822, and human-readable dates.

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