Dev-Belt Documentation
246 browser-based developer tools — all running 100% client-side. No backend compute per tool use. No data sent to servers. Free tools work instantly, no signup required.
193 Tools15 Categories100% Browser-sidePrivacy First
⌷
Git / Version Control
12 tools.gitignore Generatorfree
Generate .gitignore files for any tech stack
gitgitignoreversion-control
Git Commit Message Generatorfree
Generate conventional commit messages
gitcommitsconventional-commits
Git Branch Name Generatorfree
Generate git branch names from task descriptions
gitbranching
Conventional Commit Generatorfree
Build conventional commit messages with type, scope, and body
gitconventional-commitssemver
Git Command Generatorfree
Generate common git commands from descriptions
gitcommands
Git Diff Viewerfree
Visualize git diffs with syntax highlighting
gitdiffcode-review
Git Merge Conflict Visualizerfree
Visualize and resolve git merge conflicts
gitmergeconflicts
GitHub README Generatorfree
Generate professional GitHub README files
githubreadmedocumentation
GitHub Badge Generatorpro
Generate shields.io badges for GitHub repos
githubbadgesreadme
Git Patch Viewerpro
Parse and display git patch files
gitpatchdiff
Semantic Version Calculatorpro
Calculate next semver based on conventional commits
semverversioninggit
Git Stash Managerpro
Generate git stash commands and manage stashes
gitstash
🐳
DevOps & Infrastructure
12 toolsDockerfile Generatorfree
Generate production-ready Dockerfiles
dockerdevopscontainersinfrastructure
Environment Variable Parserfree
Parse and validate .env files
devopsenvironmentconfig
Docker Compose Generatorfree
Generate docker-compose.yml files
dockerdocker-composedevops
Kubernetes YAML Validatorpro
Validate Kubernetes YAML manifests
kubernetesk8sdevopsyaml
Nginx Config Generatorpro
Generate Nginx server configurations
nginxweb-serverdevops
CI/CD Pipeline Generatorpro
Generate CI/CD pipeline configurations
cicddevopsautomationgithub-actions
GitHub Actions Generatorpro
Generate GitHub Actions workflows
github-actionscicddevopsautomation
Terraform Snippet Generatorpro
Generate Terraform resource snippets
terraformiacclouddevops
Kubernetes Deployment Generatorpro
Generate Kubernetes Deployment manifests
kubernetesk8sdevopscontainers
Apache Config Generatorpro
Generate Apache virtual host configurations
apacheweb-serverdevops
Helm Chart Generatorpro
Generate Helm chart templates
helmkubernetesdevops
Ansible Playbook Generatorpro
Generate Ansible playbooks for automation
ansibleautomationdevops
↻
Networking / HTTP
10 toolsHTTP Status Code Lookupfree
Look up HTTP status codes and their meanings
httpapinetworkingstatus-codes
URL Parserfree
Parse URLs into components
urlhttpnetworkingapi
Query String Parserfree
Parse URL query strings into objects
urlquery-stringhttpapi
HTTP Request Builderfree
Build and format HTTP requests
httpapirestcurl
HTTP Header Decoderfree
Decode and analyze HTTP headers
httpheadersapinetworking
Cookie Parserfree
Parse HTTP cookie strings
cookieshttpweb
User-Agent Parserpro
Parse and analyze User-Agent strings
user-agenthttpbrowseranalytics
CORS Testerpro
Test and analyze CORS configurations
corshttpapisecurity
Redirect Checkerpro
Check HTTP redirect chains
httpredirectsnetworkingseo
SSL Certificate Checkerpro
Check SSL certificate validity and details
ssltlssecurityhttps
◈
Data Inspection
10 toolsJSON Tree Viewerfree
View JSON as an interactive tree
jsondataviewerformatter
JSON Path Testerfree
Test JSONPath expressions against JSON data
jsonjsonpathdataapi
CSV Table Viewerfree
View CSV data as a formatted table
csvdatatablespreadsheet
XML Tree Viewerfree
View XML as an interactive tree
xmldataviewerformatter
YAML Tree Viewerpro
View YAML as an interactive tree
yamldataviewerdevops
GraphQL Response Viewerpro
View and inspect GraphQL responses
graphqlapidata
GraphQL Query Builderpro
Build GraphQL queries visually
graphqlapiquery-builder
Data Schema Visualizerpro
Visualize JSON Schema definitions
json-schemadatavisualization
Protobuf Inspectorpro
Inspect Protocol Buffer definitions
protobufgrpcdata
MessagePack Decoderpro
Decode MessagePack binary data
messagepackbinarydata
⚗
Testing / QA
9 toolsUUID Batch Generatorfree
Generate batches of UUIDs for testing
uuidtestingdata-generation
Test Data Generatorfree
Generate realistic test data
testingmock-datafaker
API Mock Response Generatorfree
Generate mock API responses for testing
apitestingmockjson
Unit Test Template Generatorpro
Generate unit test templates for various frameworks
testingunit-testsjestpytest
Load Test Script Generatorpro
Generate load testing scripts for k6 and Artillery
load-testingperformancek6artillery
Webhook Replay Toolpro
Replay webhook payloads for testing
webhooktestingapi
Random Test Case Generatorpro
Generate random test cases and edge cases
testingfuzz-testingedge-cases
Mock JSON API Generatorpro
Generate mock JSON API endpoints
apimockjsontesting
Schema Validatorpro
Validate data against JSON Schema
json-schemavalidationtesting
◻
Frontend / UI
12 toolsCSS Border Radius Generatorfree
Generate CSS border-radius values visually
cssfrontenduidesign
Case Converterfree
Convert text between camelCase, snake_case, kebab-case, etc.
textcase-converterprogramming
CSS Animation Generatorfree
Generate CSS animations and transitions
cssanimationfrontend
CSS Keyframe Generatorfree
Generate CSS @keyframe animations
cssanimationkeyframesfrontend
CSS Triangle Generatorfree
Generate CSS triangle shapes
cssshapesfrontendui
CSS Filter Generatorfree
Generate CSS filter effects
cssfiltersfrontendimage
Tailwind Gradient Generatorpro
Generate Tailwind CSS gradient classes
tailwindcssgradientfrontend
Flexbox Cheat Sheetpro
Interactive Flexbox reference and playground
cssflexboxfrontendlayout
Grid Layout Visualizerpro
Visualize and build CSS Grid layouts
cssgridlayoutfrontend
SVG Path Editorpro
Edit and optimize SVG paths
svggraphicsfrontenddesign
Favicon Generatorpro
Generate favicon files from text or emoji
faviconiconsfrontend
Color Palette Generatorpro
Generate harmonious color palettes
colorsdesignfrontendui
◆
AI Tools
8 toolsCode Refactor Assistantadvanced
AI-powered code refactoring suggestions
airefactoringcode-quality
Code Complexity Analyzeradvanced
Analyze code complexity with AI insights
aicode-qualitycomplexitymetrics
Security Vulnerability Scanneradvanced
Scan code for security vulnerabilities with AI
aisecurityvulnerabilitysast
Log Analyzeradvanced
Analyze log files with AI pattern detection
ailogsdebuggingdevops
Stack Trace Explaineradvanced
Explain stack traces in plain English
aidebuggingstack-traceerrors
API Contract Generatoradvanced
Generate API contracts from code with AI
aiapiopenapidocumentation
Unit Test Generatoradvanced
Generate unit tests from source code with AI
aitestingunit-testsautomation
Code Documentation Generatoradvanced
Generate JSDoc, docstrings, and API docs with AI
aidocumentationjsdocdocstrings
Ａ
Text Utilities
10 toolsText Formatterfree
Format and clean text in various ways
textformattingutilities
Remove Duplicate Linesfree
Remove duplicate lines from text
textdeduplicationutilities
Sort Lines Alphabeticallyfree
Sort lines of text alphabetically
textsortingutilities
Reverse Textfree
Reverse text characters or lines
textreverseutilities
CamelCase Converterfree
Convert text to camelCase
textcamelcaseprogramming
snake_case Converterfree
Convert text to snake_case
textsnake-caseprogramming
kebab-case Converterfree
Convert text to kebab-case
textkebab-casecsshtml
Whitespace Removerfree
Remove excess whitespace from text
textwhitespacecleanup
Line Counterfree
Count lines, words, and characters in text
textcountingmetrics
Word Frequency Analyzerfree
Analyze word frequency in text
textanalyticsnlp
⊞
Documentation
8 toolsMarkdown Table Generatorfree
Generate Markdown tables from data
markdowndocumentationtables
Markdown Checklist Generatorfree
Generate Markdown task checklists
markdowndocumentationchecklists
README Template Generatorfree
Generate README templates for projects
readmedocumentationgithub
Changelog Generatorfree
Generate changelogs from conventional commits
changelogversioningdocumentation
License Generatorfree
Generate open source license files
licenseopen-sourcedocumentation
Documentation Sidebar Generatorpro
Generate documentation sidebar navigation
documentationnavigationmarkdown
OpenAPI Spec Generatorpro
Generate OpenAPI/Swagger specifications
openapiswaggerapidocumentation
Docstring Generatorpro
Generate JSDoc or Python docstrings
documentationjsdocdocstringscode
∑
Math & Hashing
8 toolsSHA-256 Hash Generatorfree
Generate SHA-256 hashes
hashsha256cryptographysecurity
SHA-512 Hash Generatorfree
Generate SHA-512 hashes
hashsha512cryptographysecurity
MD5 Hash Generatorfree
Generate MD5 hashes (not for passwords)
hashmd5checksum
UUID Generatorfree
Generate RFC 4122 UUID v4 values
uuidguidunique-idrandom
HMAC Generatorfree
Generate HMAC signatures with SHA-256/SHA-512
hmachashauthenticationapi
Base Converterfree
Convert numbers between bases (binary, octal, hex, decimal)
mathbase-conversionbinaryhex
Bit Calculatorfree
Calculate bit operations and manipulations
mathbinarybitsbitwise
CRC Calculatorfree
Calculate CRC checksums for data integrity
crcchecksumdata-integrity
📦
Package Tools
8 toolsnpm Package Infofree
Look up npm package information
npmpackagesjavascriptnodejs
package.json Generatorfree
Generate package.json files
npmpackage.jsonjavascriptnodejs
Dependency Version Checkerfree
Check if package versions are up to date
npmpackagesversionsdependencies
License Compatibility Checkerfree
Check license compatibility between packages
licenseopen-sourcecompliance
Bundle Size Estimatorpro
Estimate JavaScript bundle sizes
bundleperformancejavascriptwebpack
pypi Package Infopro
Look up PyPI package information
pypipackagespython
Go Module Explorerpro
Explore Go modules and dependencies
gomodulespackages
Cargo Crate Infopro
Look up Rust crate information from crates.io
rustcargocratespackages
🐛
Debugging
8 toolsJSON Formatterfree
Format and prettify JSON data
jsondebuggingformatterprettify
JSON Validatorfree
Validate JSON syntax and structure
jsonvalidationdebugging
Regex Testerfree
Test regular expressions with live matching
regexregexpdebuggingpattern-matching
Stack Trace Parserfree
Parse and format stack traces from any language
debuggingstack-traceerrors
Error Code Lookupfree
Look up OS and application error codes
debuggingerrorserror-codes
Log Level Filterpro
Filter and colorize log output by level
logsdebuggingfiltering
Memory Leak Detectorpro
Detect memory leak patterns in code
debuggingmemoryperformance
Performance Profiler Helperpro
Generate profiling commands for various runtimes
performanceprofilingdebugging
🛡
Cybersecurity
55 toolsBase64 Encoder / Decoderfree
Encode and decode Base64 strings
base64encodingcybersecuritycrypto
URL Encoder / Decoderfree
Encode and decode URL components
urlencodingcybersecurityweb
HTML Entity Encoderfree
Encode and decode HTML entities
htmlencodingxsssecurity
Hex Encoder / Decoderfree
Convert text to hex and back
hexencodingcybersecurity
Binary Text Converterfree
Convert between text and binary
binaryencodingcybersecurity
ROT13 Cipherfree
Apply ROT13 cipher to text
cipherencodingcybersecurity
Caesar Cipherfree
Apply Caesar cipher with configurable shift
cipherencodingcryptography
Morse Code Converterfree
Convert text to and from Morse code
morseencodingcipher
SHA-256 Hash Generatorfree
Generate SHA-256 hashes via Web Crypto API
sha256hashcryptographysecurity
SHA-512 Hash Generatorfree
Generate SHA-512 hashes via Web Crypto API
sha512hashcryptographysecurity
MD5 Hash Generatorfree
Generate MD5 hashes (educational only)
md5hashcybersecurity
HMAC Generatorpro
Generate HMAC authentication codes
hmacauthenticationapi-securitycryptography
Hash Identifierpro
Identify hash types by length and format
hashcryptographysecurity
Hash Comparison Toolpro
Compare two hashes for equality
hashcomparisonsecurity
Password Generatorpro
Generate strong passwords with configurable rules
passwordsecurityrandom
Password Strength Checkerpro
Check password strength and entropy
passwordsecurityentropy
Passphrase Generatorpro
Generate memorable passphrases
passphrasesecuritypassword
Password Entropy Calculatorpro
Calculate password entropy and crack time
passwordentropysecurity
Have I Been Pwned Checkerpro
Check if password appeared in data breaches
hibppasswordbreachsecurity
JWT Decoderpro
Decode and inspect JWT tokens
jwtauthenticationapi-securitytokens
JWT Header Analyzerpro
Analyze JWT header algorithms for security issues
jwtsecurityauthentication
API Key Generatorpro
Generate cryptographically random API keys
api-keysecurityrandomcryptography
Secret Key Generatorpro
Generate AES-256 and other secret keys
secret-keyaescryptographysecurity
UUID v4 Generatorpro
Generate cryptographically secure UUID v4
uuidrandomcryptography
TOTP Code Simulatorpro
Simulate TOTP 2FA codes (educational)
totp2famfasecurity
IP Address Analyzerpro
Analyze IPv4 addresses: type, class, binary
ipnetworkingsecurity
CIDR Subnet Calculatorpro
Calculate subnet details from CIDR notation
cidrsubnetnetworkingsecurity
MAC Address Lookuppro
Look up MAC address OUI and vendor
macnetworkingsecurity
Port Number Referencepro
Reference common port numbers and services
portsnetworkingsecurityfirewall
XSS Payload Detectorpro
Detect XSS patterns in input strings
xsssecuritywebinjection
SQL Injection Scannerpro
Detect SQL injection patterns in input
sql-injectionsecuritydatabaseweb
String Entropy Analyzerpro
Analyze string entropy for randomness detection
entropysecuritycryptographyrandom
Null Byte Detectorpro
Detect null bytes and injection patterns
null-bytesecurityinjectionweb
Regex Security Analyzerpro
Detect ReDoS vulnerabilities in regex patterns
regexredossecurityperformance
Security Headers Analyzerpro
Analyze HTTP security headers
security-headershttpwebsecurity
CSP Builderpro
Build Content Security Policy headers
cspsecurity-headersxsssecurity
CORS Policy Analyzerpro
Analyze CORS headers for security issues
corssecurityapiweb
Cookie Security Checkerpro
Check cookie security attributes
cookiessecuritywebhttp
HTTP Auth Header Decoderpro
Decode Basic and Bearer auth headers
authhttpsecurityjwt
PEM Certificate Decoderpro
Decode PEM certificates and private keys
ssltlscertificatessecurity
TLS Cipher Referencepro
Reference TLS cipher suites with security ratings
tlssslcipherssecurity
Certificate Expiry Checkerpro
Check SSL certificate expiry dates
sslcertificatesexpirysecurity
Email Header Analyzerpro
Analyze email headers for DKIM, SPF, and spam
emailsecurityspamdkim
User-Agent Fingerprinterpro
Fingerprint browsers from User-Agent strings
user-agentfingerprintingsecuritybrowser
Robots.txt Analyzerpro
Analyze robots.txt for sensitive paths
robots.txtseosecurityweb
Sitemap Analyzerpro
Analyze XML sitemaps for sensitive URLs
sitemapseosecurityweb
XOR Cipher Toolpro
Apply XOR cipher for data obfuscation
xorciphercryptographyencoding
One-Time Pad Encryptorpro
Generate one-time pad keys and encrypt
otpciphercryptographysecurity
Checksum Verifierpro
Verify file checksums with multiple algorithms
checksumhashdata-integritysecurity
Data URI Decoderpro
Decode data URIs and preview images
data-uriencodingwebsecurity
CVE Reference Lookuppro
Look up major CVE vulnerability details
cvevulnerabilitysecurityexploit
Firewall Rule Generatorpro
Generate iptables, ufw, and nftables rules
firewalliptablesufwsecurity
OWASP Top 10 Referencepro
Reference guide to OWASP Top 10 vulnerabilities
owaspsecurityvulnerabilitiesweb
JWT Attack Simulatorpro
Simulate common JWT attacks for learning
jwtsecurityattacksauthentication
HTTP Method Testerpro
Test which HTTP methods are allowed on an endpoint
httpsecurityapipenetration-testing
☁
Cloud & Infrastructure
15 toolsAWS IAM Policy Generatorpro
Generate AWS IAM policy JSON documents
awsiamcloudsecurity
AWS CLI Command Builderpro
Build AWS CLI commands with parameters
awscliclouddevops
S3 Bucket Policy Generatorpro
Generate S3 bucket policies
awss3cloudstorage
CloudFormation Snippet Generatorpro
Generate CloudFormation resource snippets
awscloudformationiaccloud
GCP IAM Binding Generatorpro
Generate GCP IAM bindings
gcpgoogle-cloudiamcloud
Azure ARM Template Generatorpro
Generate Azure ARM template snippets
azurearm-templatescloudiac
Kubernetes Secret Generatorpro
Generate Kubernetes Secret manifests
kubernetessecretssecuritydevops
Docker Registry Login Helperpro
Generate Docker registry login commands
dockerregistrydevopscloud
CDN Cache Header Generatorpro
Generate CDN cache control headers
cdncachinghttpcloud
Load Balancer Config Generatorpro
Generate load balancer configurations
load-balancernginxclouddevops
Cron Job Schedulerpro
Generate and validate cron expressions
cronschedulingdevopscloud
SSL Certificate Generator Guidepro
Guide to generating SSL certificates with Let's Encrypt
sslcertbothttpssecurity
VPC Subnet Plannerpro
Plan VPC subnets and CIDR ranges
vpcnetworkingawscloud
Container Resource Calculatorpro
Calculate CPU and memory limits for containers
kubernetesdockerresourcesdevops
Multi-Cloud Cost Estimatorpro
Estimate and compare cloud costs across providers
cloudcostawsgcp
⬡
Web3 / Blockchain
8 toolsETH Address Validatorfree
Validate Ethereum addresses and checksums
ethereumweb3blockchainaddress
Wei to ETH Converterfree
Convert between Wei, Gwei, and ETH units
ethereumweigweiunits
ETH Gas Calculatorfree
Calculate Ethereum transaction gas costs
ethereumgasweb3transactions
ENS Name Validatorfree
Validate Ethereum Name Service (ENS) domain names
ensethereumdomainsweb3
IPFS CID Validatorfree
Validate and decode IPFS Content Identifiers
ipfscidweb3decentralized
MetaMask Deep Link Builderfree
Build MetaMask deep links for dApp integration
metamaskweb3dappethereum
Solidity Function Selectorpro
Compute Solidity function selectors and signatures
solidityethereumsmart-contractsabi
ERC20 ABI Generatorpro
Generate standard ERC20 ABI for token interactions
erc20abisolidityethereum
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