v1.2 · 90+ tools, all local

The developer toolkit that never leaves your tab.

Format, validate, decode, hash, diff, convert. Browser-native tools for the things you reach for ten times a day — without a paste-buffer ever leaving your machine.

Tools
90+
Categories
14
Server calls
0
{"name": "mytools""version": "1.2""local": true}SHA-256a3f2…91c4REGEX/^\d+$/422026v1JWTBase64URLYAMLX.509CronRuns entirely in your browserNo server round-trip · zero telemetry · install offline
Why mytools

Three principles, no exceptions.

Private by construction

Every tool runs in the browser. Your tokens, payloads and certificates never reach a server because there isn't one.

Instant by default

Zero round-trips. Zero loading spinners on tools you use daily. Cached after first visit, fully usable offline.

Open and inspectable

MIT-licensed source. Static bundles. Self-host behind SSO or audit the build — no hidden network calls to grep for.

Catalog

Navigate by discipline.

Most used

The four tools nobody admits to opening daily.

Open one tool. Stay for the rest.

No accounts, no upsells, no telemetry. Just the toolbelt you already wish your bookmarks bar held.

The full catalog

90 tools, organised across 14 categories.

Search by name, tag, or category — or jump straight in.

Artificial Intelligence2
AI-powered protocol inspectors: MCP and Agent-to-Agent
A2A Inspector
Test Agent-to-Agent protocol agents: view the agent card, validate spec compliance, chat, and inspect raw JSON-RPC 2.0 messages
a2aagentprotocol
MCP Inspector
Connect to any Model Context Protocol server, browse tools, and call them interactively over SSE or HTTP
mcpmodel-context-protocolai
Diff & Compare3
Compare documents side by side with highlighted differences
JSON Diff
Compare two JSON documents side by side with highlighted differences
jsondiffcompare
Text Diff
Compare any two text blocks with line-by-line diff highlighting
textdiffcompare
XML Diff
Compare two XML documents side by side with highlighted differences
xmldiffcompare
API & Web Services6
REST, SOAP, WSDL: build and inspect web service requests
API Request Builder
Build and test HTTP requests with headers, body, and authentication
apihttprequest
JSONPath Tester
Test and evaluate JSONPath expressions against JSON data
jsonjsonpathquery
SOAP Client
Test SOAP web services by sending requests and viewing responses
soapwsdlxml
Swagger / OpenAPI Viewer
Paste or upload an OpenAPI spec and get interactive API documentation
swaggeropenapiapi
URL Parser
Parse and analyze URLs into components: protocol, host, path, query, fragment
urlparsequery
WSDL Parser
Parse and visualize WSDL files, view services, ports, operations, and messages
wsdlsoapxml
Encoding & Decoding7
Encode and decode text: Base64, URL, HTML, Unicode, Gzip
Base64 Encode / Decode
Encode and decode Base64 strings instantly
base64encodedecode
Gzip Compress / Decompress
Compress and decompress text using Gzip with Base64 encoding
gzipcompressdecompress
Hex Encoder / Decoder
Encode text to hexadecimal and decode hex strings back to text (UTF-8)
hexhexadecimalencode
HTML Entities Encoder
Encode and decode HTML entities and special characters
htmlentitiesencode
String Escape / Unescape
Escape and unescape strings for JSON, XML, HTML, JavaScript, SQL, and CSV
escapeunescapejson
Unicode Converter
Convert text to/from Unicode escape sequences, code points, and UTF-8 hex
unicodeutf8escape
URL Encode / Decode
Encode and decode URL components
urlencodedecode
Certificates & Keys7
X.509 certificates, SSH keys, PKI tooling, and SSL inspection
Certificate & CSR Generator
Generate self-signed X.509 certificates and Certificate Signing Requests (CSR) with RSA / ECDSA keys
certificatex509self-signed
Certificate Chain & SSL
Inspect live server certificate chains, validate trust hierarchy, and decode every cert field — all locally via direct TLS connection
certificatechainvalidate
Certificate Inspector
Decode, fingerprint, convert, and parse X.509 certificates — PEM, DER, CRT, CER. Fetch live from any URL.
certificatex509pem
Java KeyStore (JKS) Tool
Create, view, and manage Java KeyStore files - import/export certificates and keys
jkskeystorejava
Key Pair Generator
Generate RSA, ECDSA, and Ed25519 key pairs in PEM and other formats
keyrsaecdsa
PKCS#12 / PFX Tool
Create, extract, and convert PKCS#12/PFX files containing certificates and private keys
pkcs12pfxp12
SSH Key Generator
Generate SSH key pairs (RSA, ECDSA, Ed25519) with optional passphrase protection
sshkeyrsa
Cryptography8
Hashing, HMAC, JWT, JWS, JWE, and JWK key generation
AES Encrypt & Decrypt
Encrypt and decrypt text using AES-128/192/256 with passphrase or key
aesencryptdecrypt
BCrypt Hash & Verify
Generate BCrypt hashes for passwords and verify passwords against existing hashes
bcryptpasswordhash
Hash Generator
Generate MD5, SHA-1, SHA-224, SHA-256, SHA-384, SHA-512, SHA-3, RIPEMD-160 hashes
hashmd5sha
HMAC Generator
Generate HMAC signatures using SHA-1, SHA-256, SHA-384, SHA-512 algorithms
hmacshasignature
JWE Encrypt & Decrypt
Encrypt and decrypt data using JSON Web Encryption (JWE) with RSA and AES algorithms
jweencryptdecrypt
JWK Generator
Generate JSON Web Keys (JWK) for RSA, EC, and symmetric algorithms
jwkkeygenerate
JWS Sign & Verify
Create and verify JSON Web Signatures (JWS) with HMAC, RSA, and ECDSA algorithms
jwssignaturesign
JWT Decoder
Decode and inspect JSON Web Tokens — header, payload and signature
jwttokendecode
Data Converters7
Convert between data formats: XML, JSON, CSV, YAML, XSLT
CSV to JSON Converter
Convert CSV data to JSON arrays or objects with header detection
csvjsonconvert
CSV to XML Converter
Convert CSV data to XML format with customizable element names
csvxmlconvert
JSON to CSV Converter
Convert JSON arrays and objects to CSV with custom delimiters and headers
jsoncsvconvert
JSON to XML Converter
Convert JSON objects to well-formed XML documents
jsonxmlconvert
XML to JSON Converter
Convert XML documents to JSON format with attribute handling options
xmljsonconvert
XSLT Transformer
Transform XML documents using XSLT stylesheets
xsltxmltransform
YAML ↔ JSON Converter
Convert between YAML and JSON formats bidirectionally
yamljsonconvert
Formatters7
Beautify and minify code in JSON, XML, SQL, HTML, JS, and CSS
CSS Formatter
Beautify and minify CSS stylesheets with vendor prefix handling
cssbeautifyminify
HTML Formatter
Format, prettify and beautify HTML documents with customizable indentation
htmlformatprettify
JavaScript Formatter
Beautify and minify JavaScript code with configurable options
javascriptjsbeautify
JSON Formatter
Prettify, minify and validate JSON with syntax highlighting and tree view
jsonformatprettify
SQL Formatter
Format and beautify SQL queries
sqlformatquery
XML Formatter
Format, prettify and validate XML documents
xmlformatprettify
YAML Formatter
Format, validate and beautify YAML documents with indent control
yamlformatprettify
Fun & Games7
Coin toss, dice rolls, timers, and other playful utilities
Coin Toss
Flip a fair virtual coin with 3D animation — heads or tails with flip statistics
coinfliprandom
Dice Roll
Roll polyhedral dice (d4–d20) with advantage/disadvantage mode for TTRPGs and probability experiments
dicerolld6
Magic 8-Ball
Ask a yes/no question and let the classic Magic 8-Ball reveal your fate with all 20 original responses
magic8ballfortune
Spin the Wheel
Animated prize wheel — add up to 12 custom options and spin to pick a random winner
spinwheelrandom
Stopwatch
High-precision stopwatch with lap splits, best/worst lap highlighting, and millisecond accuracy — runs entirely in your browser
stopwatchtimerlap
Timer
Countdown timer with presets, custom duration, audio chime, and Pomodoro support — runs entirely in your browser
timercountdownpomodoro
Typing Speed Test
Measure your WPM with real-time character highlighting, accuracy tracking, and timed test modes
typingwpmspeed
Generators9
Create UUIDs, passwords, code stubs, QR codes, and more
Color Contrast Checker
Check WCAG contrast ratios between foreground and background colors
colorcontrastwcag
Java POJO Generator
Generate Java classes, records, interfaces from JSON/XML or convert Java to JSON/XML
javapojoclass
JSON to TypeScript
Convert JSON objects to TypeScript interfaces and types automatically
jsontypescriptinterface
Lorem Ipsum Generator
Generate placeholder text in paragraphs, sentences, or words
loremipsumplaceholder
Markdown Table Generator
Create and edit markdown tables with a visual spreadsheet interface
markdowntablegenerator
Password Generator
Generate secure random passwords with customizable length and character sets
passwordsecurerandom
QR Code Generator
Generate QR codes from text, URLs, or data with customization options
qrqrcodebarcode
Slug Generator
Generate URL-safe slugs from any text — supports unicode, custom separators
slugurlpermalink
UUID Generator
Generate random UUIDs (v4) in bulk
uuidguidrandom
Network3
IP, subnet, MAC address tooling and lookups
IP Address Tools
Validate, parse, and convert IPv4/IPv6 addresses with detailed information
ipipv4ipv6
MAC Address Tools
Validate, format, and generate MAC addresses with vendor lookup
macaddressnetwork
Subnet Calculator
Calculate subnet masks, network ranges, CIDR notation, and available hosts
subnetcidrnetwork
Text & Utilities11
Text manipulation, time, color, number bases, and productivity
Color Picker & Converter
Pick colors and convert between HEX, RGB, HSL formats
colorhexrgb
Cron Expression Parser
Parse, validate and explain cron expressions with next run times
cronschedulejob
Markdown Preview
Write Markdown and see a live rendered preview side by side
markdownpreviewmd
Number Base Converter
Convert numbers between decimal, binary, octal and hexadecimal
binaryhexoctal
Personal Todo List
Production-grade task manager with IndexedDB storage, categories, archive, trash, import/export, subtasks, and more
todotaskproductivity
Rich Text Editor
WYSIWYG document editor with full formatting (bold, headings, lists, links, colors), multiple documents, local save, source view, and export
editorwysiwygrich text
Sticky Notes
Create, organize, and persist colorful sticky notes in your browser — pin, color-code, search, and delete with full localStorage memory
notesstickymemo
String Case Converter
Convert text between camelCase, snake_case, PascalCase, kebab-case and more
casecamelsnake
Text Manipulation Tools
Sort lines, remove duplicates, trim whitespace, count words and more
textsortunique
Timestamp Converter
Convert between Unix timestamps and human-readable dates
timestampunixepoch
Unix Permissions Calculator
Calculate chmod numeric values and understand file permission bits
unixchmodpermissions
Validators8
Validate syntax, schemas, and patterns in your data
Credit Card Validator
Validate and generate test credit card numbers with Luhn algorithm
creditcardvalidate
Email Validator
Validate email addresses with RFC-compliant syntax and disposable detection
emailvalidatesyntax
HTML Validator
Validate HTML markup for errors and best practices
htmlvalidatesyntax
JSON Validator
Validate JSON syntax with detailed error messages and line numbers
jsonvalidatesyntax
Regex Tester
Test regular expressions with live matching and group highlighting
regexregexptest
XML Validator
Validate XML syntax and well-formedness with error highlighting
xmlvalidatesyntax
XPath Tester
Test and evaluate XPath expressions against XML documents
xpathxmlquery
XSD Schema Validator
Validate XML documents against XSD schemas with detailed error reporting
xsdxmlschema
Reference5
Lookup guides for HTTP codes, MIME types, ports, and RFCs
HTTP Status Codes Reference
Complete reference guide for HTTP status codes (1xx-5xx) with detailed descriptions, use cases, common scenarios, and best practices for REST API development
httpstatuscodes
IP Ranges Reference
Reference guide for private, reserved, and special-use IP address ranges
iprangeprivate
MIME Types Reference
Comprehensive searchable database of MIME types (Content-Types) with file extensions, categories, and usage examples for web development, file uploads, and HTTP headers
mimecontent-typefile
Port Number Reference
Comprehensive reference of common network ports, protocols, and services
portnetworktcp
RFC Standards Reference
Comprehensive reference for important RFC standards including JWT, JWE, JWS, OAuth, HTTP, TLS, and other security and web protocols
rfcstandardsjwt