Developer tools
Fast browser utilities. No signup.
Popular
SAML Metadata Parser
Parse SAML Metadata XML and extract IdP/SP configuration
Stack Trace Formatter
Format and beautify JavaScript, Python, Java, C#, Go, PHP, and Ruby stack traces
File Size Converter
Convert file sizes between decimal (SI) and binary (IEC) units
iOS App Lookup
Look up iOS app metadata from the App Store using bundle ID
Beautify Stack Trace
Clean up and beautify messy error stack traces for readability
Random Number Generator
Generate random numbers and see code samples in multiple languages
All tools
JS Tokenizers
Tokenize text using various AI tokenizers
RAG Chunker
Split text into retrieval-friendly chunks with overlap and token counts
Sentiment Analysis
Analyze emotional tone of text using AI
Zero-Shot Classification
Classify text into custom categories without training using AI
Sentence Similarity
Generate embeddings and find semantic similarity between texts using AI
Question Answering
Answer questions based on provided context using AI
Fill-Mask Text Completion
Complete sentences and predict missing words using AI
Text Summarization
Summarize long text into concise overviews using AI
Text Extractor
Extract emails, URLs, IPs, dates, and patterns from text
Vibe Check
Generate AI code review, test plan, and production readiness prompts for vibe-coded apps
JSON Prettifier
Format and validate JSON data
XML/HTML Formatter
Format, validate, prettify, and minify XML or HTML data
XML ↔ JSON Converter
Bidirectional XML-to-JSON and JSON-to-XML converter using the familiar @attr / _text convention; repeated tags collapse into arrays
JSONPath Query Engine
Test JSONPath expressions — supports dot/bracket access, wildcards, slices, recursive descent (..), and filter [?(...)] expressions
GraphQL Formatter
Format and validate GraphQL queries, mutations, subscriptions, and fragments — preserves string literals, args, blocks, lists, and comments
TOML Parser
Parse, validate, format, and round-trip TOML to/from JSON — spec-compliant via smol-toml
CSS Minifier / Beautifier
Minify CSS by stripping comments and whitespace, or beautify minified CSS with re-indentation — preserves spaces inside parentheses for values like rgba() and calc()
JavaScript Minifier
Strip comments and whitespace from JavaScript while preserving strings, template literals, and regex syntax — no AST, no variable renaming, just fast cosmetic minification
Data URI Converter
Convert text to a data: URI with UTF-8 Base64 encoding, or decode a data: URI back to text or binary bytes — handles any MIME type
Markdown Live Preview
Write Markdown on the left, see the rendered HTML preview on the right — supports headings, bold, italic, code, lists, quotes, links, autolinks, and GFM strikethrough
SVG Editor
Edit SVG code on the left, see the live preview on the right — strips scripts and event handlers for safety, adjusts missing xmlns
SVG Path Visualizer
Paste an SVG path d attribute and see it rendered instantly — includes presets (curve, star, arc, bezier), adjustable stroke/fill colors, and an optional grid overlay
HL7 Parser
Read and parse HL7 v2 messages into structured JSON
HL7 to FHIR Converter
Convert HL7 v2 messages to FHIR R4 Bundles
Diff / Text Compare
Compare two texts and see color-coded differences
Stack Trace Analyzer
Analyze stack traces to identify root causes, explain errors, and separate app from framework code
Base64 Encoder/Decoder
Encode and decode Base64 strings
Unix Timestamp Converter
Convert Unix epoch timestamps to human-readable dates — single or batch — with timezone support
Cron Expression Tester
Test and parse cron expressions, explain them in plain English, and preview upcoming run times across timezones
Cron Expression Generator
Build cron expressions visually with field controls — no syntax knowledge required
URL Encoder / Decoder
Encode and decode URLs using encodeURIComponent and encodeURI
YAML/JSON Converter & Formatter
Convert between YAML and JSON, or format and validate standalone YAML
CSV ↔ JSON Converter
Convert between CSV and JSON with auto-detection, delimiter handling, type inference, and nested-object flattening
CSV Viewer / Table Explorer
Paste CSV and explore it as a sortable, searchable table with sticky headers — no spreadsheet required
SQL Formatter
Format and prettify SQL queries with support for MySQL, PostgreSQL, SQLite, and more
String Case Converter
Convert text between camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE, dot.case, path/case, title, and sentence case
Text Statistics
Live word, character, sentence, line, and paragraph counts with reading time and average length stats
Line Sorter & Deduplicator
Sort lines alphabetically, numerically, by length, with optional deduplication and trimming
String Escape / Unescape
Escape and unescape text for JSON, XML, CSV, regex, or POSIX shell contexts
Whitespace Visualizer & Cleaner
Spot invisible whitespace characters (tabs, NBSP, zero-width, trailing) and clean them with batch options
HTML Entity Encoder / Decoder
Encode text to HTML entities (named, decimal, hex) and decode entities back to characters
Unicode Escape / Unescape
Convert text to \uXXXX and \u{XXXXX} Unicode escapes and back — handles emoji and surrogate pairs
Morse Code Translator
Convert text to ITU-R M.1677-1 Morse code and back — supports letters, digits, common punctuation, and word breaks
String Similarity
Compare strings using Jaro-Winkler, Levenshtein, Dice, and Hamming algorithms
Regex Tester
Test regular expressions with match highlighting, capture groups, and string replacement
Regex Library
Browse and copy common regular expressions for validation, extraction, and text processing
Number Base Converter
Convert numbers between binary, octal, decimal, and hex with two's complement
SemVer Comparator
Compare, sort, and validate semantic version strings per SemVer 2.0.0 with prerelease and build metadata support
Agent Helper
AI assistant for building and debugging software agents
GameWobble
Free bite-sized browser games you can play instantly with no downloads or signup
Terremoto
iOS app for tracking earthquakes in real-time
FedPulse
iOS app to search, save, and track federal government jobs
FAA Part 107 Quiz Prep
iOS app for FAA Part 107 drone pilot certification exam preparation
Citizenship Test Prep
iOS app for US citizenship naturalization test preparation
ClawPet
iOS virtual desktop pet that visualizes bot activity in real-time
Tech - Interview Prep
iOS app for technical interview prep with 1,400+ questions across AI, system design, and more
DownRangeHQ Shot Timer
iOS and Apple Watch shot timer and drill tracker for competition shooters
Melody Island: Kids Piano
iOS piano app for kids with colorful keys, adventure levels, and guided songs
ColorPop Calculator
iOS calculator for kids ages 4-8 with visual object-based math
Phlebotomy Technician ExamPrep
iOS app for NHA Certified Phlebotomy Technician exam preparation
CCMA Exam Prep
iOS app for Certified Clinical Medical Assistant exam preparation
Password Generator
Generate secure random passwords
UUID Generator
Generate UUIDs across all RFC 9562 versions — nil, v1, v2, v3, v4, v5, v6, v7, and v8
Lorem Ipsum Generator
Generate placeholder text for designs
QR Code Generator
Generate QR codes from text, URLs, or any data
ULID Generator
Generate ULIDs — 26-character lexicographically sortable identifiers (48-bit timestamp + 80-bit random) with optional monotonic mode
Git Branch Name Generator
Convert a feature description into a clean, git-safe branch name with optional prefix (feat, fix, chore, etc.) and ticket id. Includes copy-paste checkout and push commands
ASCII Art Text Generator
Convert text to ASCII art banner with built-in block, banner, and thin fonts — no external font files, works in any browser
JSON to TypeScript
Convert JSON to TypeScript interfaces
JSON to JSDoc
Convert JSON to JSDoc type definitions
JSON to C#
Convert JSON to C# classes
JSON to Swift
Convert JSON to Swift structs
JSON to Kotlin
Convert JSON to Kotlin data classes
JSON to Python
Convert JSON to Python dataclasses or Pydantic models
JSON to Go
Convert JSON to Go structs
JSON to Rust
Convert JSON to Rust structs
JSON Schema Validator & Generator
Infer a JSON Schema (draft 2020-12 or draft-07) from JSON and validate JSON against a schema — supports multiple samples to detect optional fields
Color Picker
Pick colors, convert between HEX/RGB/HSL/HSV/CMYK, and browse curated palettes (Tailwind, Nord, Solarized, Dracula, and more)
Secrets Scanner
Scan text, logs, or configs for leaked keys and tokens
JWT Decoder
Decode and inspect JWT tokens
MD5 Hash
Generate MD5 hashes from text
SHA-1 Hash
Generate SHA-1 hashes from text
SHA-256/384/512 Hash
Generate secure SHA-256, SHA-384, or SHA-512 hashes from text
HMAC Generator
Generate HMAC signatures with SHA-1, SHA-256, SHA-384, or SHA-512 — output as hex, base64, or base64url
Clawdbot Security Scanner
Audit Clawdbot/Moltbot/OpenClaw configs for security vulnerabilities
SAML Decoder
Decode SAML Requests/Responses from Base64 to readable XML
SAML Certificate Inspector
Inspect X.509 certificates from SAML metadata, responses, or PEM
Certificate & CSR Decoder
Decode X.509 certificates and PKCS#10 CSRs — subject, issuer, expiry, SANs, extensions, and key details
SAML Assertion Builder
Generate test SAML Responses, AuthnRequests, and LogoutRequests
SAML Metadata Generator
Generate SAML 2.0 EntityDescriptor metadata XML for SPs and IdPs
SAML Response Validator
Debug a SAML Response and find out why SSO login is failing
API Tester
Test and view API responses
HTTP Status Code Reference
Searchable reference of all HTTP status codes with descriptions and use cases
MIME Type Lookup
Search common MIME types by file extension, MIME string, or category — covers images, video, audio, archives, documents, code, fonts, and data formats
Common Port Number Reference
Searchable reference of common TCP/UDP ports for web, database, email, file transfer, remote access, messaging, networking, DevOps, and security services
CIDR / Subnet Calculator
IPv4 and IPv6 CIDR calculator — network address, broadcast, subnet mask, host range, RFC 1918 / ULA private range detection, reverse DNS PTR, and subnet splitting
OSS Data
Open-source data tools for developers