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From Base64 encoding to JWT debugging, use 80+ online tools for free with zero installs while keeping everything on your device.
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Works everywhere
Responsive on any device
New tools you can try now
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Security Headers
Check missing or weak HTTP security headers
Log Redactor
Redact emails, IPs, and JWTs from logs
Patch Viewer
Inspect git diff/patch files
Patch Linter
Lint diff files for whitespace and newline issues
Schema → TypeScript
Convert JSON Schema to TypeScript types
URL Cleaner
Remove tracking params and normalize query strings
Sitemap Analyzer
Analyze sitemap.xml entries and duplicates
DNS Compare
Compare two DNS record sets
Certificate Chain Inspector
Inspect certificate chains and SHA-256 fingerprints
Robots.txt Tester
Check allow/disallow rules from robots.txt
Security & Encryption
Jasypt
AES encryption and decryption
Hash
MD5, SHA hash generation
Password
Secure password generator
Bcrypt
Bcrypt password hashing
HMAC
HMAC message authentication codes
OTP
OTP one-time passwords
Basic Auth
HTTP Basic Auth helper
String Obfuscator
Mask or obfuscate strings
Password Strength
Analyze password strength
BIP39
Generate BIP39 mnemonics
CSP Builder
Build Content Security Policy headers
SRI Generator
Generate Subresource Integrity hashes
Secret Scanner
Detect exposed tokens and API keys in local text
.env Crypto
Encrypt and decrypt .env secrets
SSH Keys
Generate and inspect SSH keys
SAML Debugger
Decode SAML requests/responses
OAuth Playground
OAuth 2.0 PKCE helper
WebAuthn Tester
Decode WebAuthn payloads
PEM/DER Converter
Convert certificate formats between PEM and DER
Coupang partner picks
Some links are affiliate links that help keep the tools free.
Data Format
JSON
JSON formatting and validation
JSON Lines
Convert JSONL and JSON arrays
JSON Flatten
Flatten nested JSON and restore it
GraphQL
GraphQL Query Formatter & Validator
JWT
JWT token decoding and validation
SQL
SQL query formatting
MyBatis
Convert MyBatis query to executable SQL
CSV/JSON
CSV ↔ JSON conversion
HTML/XML
HTML/XML formatting
YAML ↔ JSON
YAML ↔ JSON converter
YAML ↔ TOML
YAML ↔ TOML converter
JSON ↔ TOML
JSON ↔ TOML converter
XML ↔ JSON
XML ↔ JSON converter
Markdown → HTML
Markdown → HTML converter
JSON Minify
JSON minify/format
JSON ↔ CSV
JSON → CSV converter
JSON Diff
Compare JSON payloads
JSONPath Finder
Generate JSONPath from JSON payloads
Schema → TypeScript
Convert JSON Schema to TypeScript types
Env Linter
Lint .env files for duplicates, missing values, and format issues
.env Diff
Compare .env files for added, removed, and changed keys
Schema Visualizer
SQL DDL to ERD summary
SQL Explain Analyzer
Analyze SQL execution plans
MessagePack Converter
Convert between JSON and MessagePack binary format
tool.bson
tool.bson.desc
tool.protobuf
tool.protobuf.desc
tool.dbConnection
tool.dbConnection.desc
Text
Slugify
URL/file-safe slug conversion
NATO Alphabet
NATO phonetic alphabet helper
Text ↔ Binary
Text ↔ binary converter
Text ↔ Unicode
Text ↔ unicode code points
Text Stats
Text statistics analyzer
Log Inspector
Filter and analyze log text by level and keyword
Log Redactor
Redact emails, IPs, and JWTs from logs
Numeronym
Numeronym generator
List Converter
Sort/transform lists
Email Normalizer
Normalize email addresses
Network & DevOps
IP Calc
IP/CIDR subnet calculator
Diff
Text comparison
URL Parser
URL parsing and analysis
IPv4 Converter
IPv4 converter
HTTP Headers
Convert HTTP headers and JSON
Security Headers
Check missing or weak HTTP security headers
URL Cleaner
Remove tracking params and normalize query strings
Cookie Parser
Parse Cookie headers and build them from JSON
HTTP Builder
Compose HTTP requests and snippets offline
WebSocket Tester
Test WebSocket connections and send/receive messages
SSL Certificate Analyzer
Parse and analyze SSL/TLS X.509 certificates
DNS Lookup
Query DNS records for any domain
DNS Compare
Compare two DNS record sets
Sitemap Analyzer
Analyze sitemap.xml entries and duplicates
Certificate Chain Inspector
Inspect certificate chains and SHA-256 fingerprints
Robots.txt Tester
Check allow/disallow rules from robots.txt
CORS Tester
Inspect CORS response headers
Latency Tester
Measure endpoint latency
API Response Time
API response time chart
HAR Analyzer
Analyze HAR network logs offline
TLS Diagnostics
Parse TLS handshake output
gRPC Client
Build grpcurl commands and review responses
Webhook Tester
Receive, verify, and replay webhooks
Network Path Analyzer
DNS multi-resolver plus path analysis
Pagination Tester
Test API pagination flows
Workflow
Commit Message Builder
Conventional Commits message builder
Dependency Checker
Check latest dependency versions
Regex Debugger
Step-by-step regex matcher
Patch Viewer
Inspect git diff/patch files
Patch Linter
Lint diff files for whitespace and newline issues
API Scenario Runner
Replay multi-step API scenarios and compare responses
API Contract Tester
Validate OpenAPI/GraphQL contracts
OpenTelemetry Trace Viewer
Inspect OTLP/Jaeger/Zipkin traces
Kubernetes Manifest Validator
Validate Kubernetes YAML manifests
Dockerfile Linter
Lint Dockerfiles and estimate base size
GitHub Actions Linter
Review GitHub Actions workflows
Terraform Diff
Compare Terraform changes
Changelog Generator
Generate Markdown changelogs
Feature Flag Builder
Build feature flag configuration files
Lockfile Analyzer
Analyze package-lock.json changes
tool.gitHooks
tool.gitHooks.desc
Code Snippets
Copy-paste code snippets by language
Common tasks like Base64, JWT, CSV conversion with ready examples.
Changelog
Changelog shows active updates
Document new features and fixes to demonstrate an actively maintained site.