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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

Tool Categories

⌷
Git / Version Control
12 tools
🐳
DevOps & Infrastructure
12 tools
↻
Networking / HTTP
10 tools
◈
Data Inspection
10 tools
⚗
Testing / QA
9 tools
◻
Frontend / UI
12 tools
◆
AI Tools
8 tools
Ａ
Text Utilities
10 tools
⊞
Documentation
8 tools
∑
Math & Hashing
8 tools
📦
Package Tools
8 tools
🐛
Debugging
8 tools
🛡
Cybersecurity
55 tools
☁
Cloud & Infrastructure
15 tools
⬡
Web3 / Blockchain
8 tools
Ａ

Text Utilities

10 tools
Text Formatterfree
Format and clean text in various ways
textformattingutilities
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Remove Duplicate Linesfree
Remove duplicate lines from text
textdeduplicationutilities
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Sort Lines Alphabeticallyfree
Sort lines of text alphabetically
textsortingutilities
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Reverse Textfree
Reverse text characters or lines
textreverseutilities
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CamelCase Converterfree
Convert text to camelCase
textcamelcaseprogramming
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snake_case Converterfree
Convert text to snake_case
textsnake-caseprogramming
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kebab-case Converterfree
Convert text to kebab-case
textkebab-casecsshtml
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Whitespace Removerfree
Remove excess whitespace from text
textwhitespacecleanup
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Line Counterfree
Count lines, words, and characters in text
textcountingmetrics
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Word Frequency Analyzerfree
Analyze word frequency in text
textanalyticsnlp
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🛡

Cybersecurity

55 tools
Base64 Encoder / Decoderfree
Encode and decode Base64 strings
base64encodingcybersecuritycrypto
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URL Encoder / Decoderfree
Encode and decode URL components
urlencodingcybersecurityweb
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HTML Entity Encoderfree
Encode and decode HTML entities
htmlencodingxsssecurity
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Hex Encoder / Decoderfree
Convert text to hex and back
hexencodingcybersecurity
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Binary Text Converterfree
Convert between text and binary
binaryencodingcybersecurity
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ROT13 Cipherfree
Apply ROT13 cipher to text
cipherencodingcybersecurity
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Caesar Cipherfree
Apply Caesar cipher with configurable shift
cipherencodingcryptography
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Morse Code Converterfree
Convert text to and from Morse code
morseencodingcipher
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SHA-256 Hash Generatorfree
Generate SHA-256 hashes via Web Crypto API
sha256hashcryptographysecurity
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SHA-512 Hash Generatorfree
Generate SHA-512 hashes via Web Crypto API
sha512hashcryptographysecurity
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MD5 Hash Generatorfree
Generate MD5 hashes (educational only)
md5hashcybersecurity
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HMAC Generatorpro
Generate HMAC authentication codes
hmacauthenticationapi-securitycryptography
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Hash Identifierpro
Identify hash types by length and format
hashcryptographysecurity
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Hash Comparison Toolpro
Compare two hashes for equality
hashcomparisonsecurity
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Password Generatorpro
Generate strong passwords with configurable rules
passwordsecurityrandom
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Password Strength Checkerpro
Check password strength and entropy
passwordsecurityentropy
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Passphrase Generatorpro
Generate memorable passphrases
passphrasesecuritypassword
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Password Entropy Calculatorpro
Calculate password entropy and crack time
passwordentropysecurity
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Have I Been Pwned Checkerpro
Check if password appeared in data breaches
hibppasswordbreachsecurity
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JWT Decoderpro
Decode and inspect JWT tokens
jwtauthenticationapi-securitytokens
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JWT Header Analyzerpro
Analyze JWT header algorithms for security issues
jwtsecurityauthentication
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API Key Generatorpro
Generate cryptographically random API keys
api-keysecurityrandomcryptography
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Secret Key Generatorpro
Generate AES-256 and other secret keys
secret-keyaescryptographysecurity
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UUID v4 Generatorpro
Generate cryptographically secure UUID v4
uuidrandomcryptography
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TOTP Code Simulatorpro
Simulate TOTP 2FA codes (educational)
totp2famfasecurity
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IP Address Analyzerpro
Analyze IPv4 addresses: type, class, binary
ipnetworkingsecurity
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CIDR Subnet Calculatorpro
Calculate subnet details from CIDR notation
cidrsubnetnetworkingsecurity
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MAC Address Lookuppro
Look up MAC address OUI and vendor
macnetworkingsecurity
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Port Number Referencepro
Reference common port numbers and services
portsnetworkingsecurityfirewall
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XSS Payload Detectorpro
Detect XSS patterns in input strings
xsssecuritywebinjection
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SQL Injection Scannerpro
Detect SQL injection patterns in input
sql-injectionsecuritydatabaseweb
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String Entropy Analyzerpro
Analyze string entropy for randomness detection
entropysecuritycryptographyrandom
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Null Byte Detectorpro
Detect null bytes and injection patterns
null-bytesecurityinjectionweb
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Regex Security Analyzerpro
Detect ReDoS vulnerabilities in regex patterns
regexredossecurityperformance
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Security Headers Analyzerpro
Analyze HTTP security headers
security-headershttpwebsecurity
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CSP Builderpro
Build Content Security Policy headers
cspsecurity-headersxsssecurity
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CORS Policy Analyzerpro
Analyze CORS headers for security issues
corssecurityapiweb
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Cookie Security Checkerpro
Check cookie security attributes
cookiessecuritywebhttp
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HTTP Auth Header Decoderpro
Decode Basic and Bearer auth headers
authhttpsecurityjwt
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PEM Certificate Decoderpro
Decode PEM certificates and private keys
ssltlscertificatessecurity
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TLS Cipher Referencepro
Reference TLS cipher suites with security ratings
tlssslcipherssecurity
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Certificate Expiry Checkerpro
Check SSL certificate expiry dates
sslcertificatesexpirysecurity
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Email Header Analyzerpro
Analyze email headers for DKIM, SPF, and spam
emailsecurityspamdkim
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User-Agent Fingerprinterpro
Fingerprint browsers from User-Agent strings
user-agentfingerprintingsecuritybrowser
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Robots.txt Analyzerpro
Analyze robots.txt for sensitive paths
robots.txtseosecurityweb
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Sitemap Analyzerpro
Analyze XML sitemaps for sensitive URLs
sitemapseosecurityweb
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XOR Cipher Toolpro
Apply XOR cipher for data obfuscation
xorciphercryptographyencoding
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One-Time Pad Encryptorpro
Generate one-time pad keys and encrypt
otpciphercryptographysecurity
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Checksum Verifierpro
Verify file checksums with multiple algorithms
checksumhashdata-integritysecurity
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Data URI Decoderpro
Decode data URIs and preview images
data-uriencodingwebsecurity
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CVE Reference Lookuppro
Look up major CVE vulnerability details
cvevulnerabilitysecurityexploit
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Firewall Rule Generatorpro
Generate iptables, ufw, and nftables rules
firewalliptablesufwsecurity
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OWASP Top 10 Referencepro
Reference guide to OWASP Top 10 vulnerabilities
owaspsecurityvulnerabilitiesweb
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JWT Attack Simulatorpro
Simulate common JWT attacks for learning
jwtsecurityattacksauthentication
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HTTP Method Testerpro
Test which HTTP methods are allowed on an endpoint
httpsecurityapipenetration-testing
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☁

Cloud & Infrastructure

15 tools
AWS IAM Policy Generatorpro
Generate AWS IAM policy JSON documents
awsiamcloudsecurity
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AWS CLI Command Builderpro
Build AWS CLI commands with parameters
awscliclouddevops
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S3 Bucket Policy Generatorpro
Generate S3 bucket policies
awss3cloudstorage
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CloudFormation Snippet Generatorpro
Generate CloudFormation resource snippets
awscloudformationiaccloud
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GCP IAM Binding Generatorpro
Generate GCP IAM bindings
gcpgoogle-cloudiamcloud
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Azure ARM Template Generatorpro
Generate Azure ARM template snippets
azurearm-templatescloudiac
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Kubernetes Secret Generatorpro
Generate Kubernetes Secret manifests
kubernetessecretssecuritydevops
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Docker Registry Login Helperpro
Generate Docker registry login commands
dockerregistrydevopscloud
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CDN Cache Header Generatorpro
Generate CDN cache control headers
cdncachinghttpcloud
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Load Balancer Config Generatorpro
Generate load balancer configurations
load-balancernginxclouddevops
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Cron Job Schedulerpro
Generate and validate cron expressions
cronschedulingdevopscloud
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SSL Certificate Generator Guidepro
Guide to generating SSL certificates with Let's Encrypt
sslcertbothttpssecurity
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VPC Subnet Plannerpro
Plan VPC subnets and CIDR ranges
vpcnetworkingawscloud
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Container Resource Calculatorpro
Calculate CPU and memory limits for containers
kubernetesdockerresourcesdevops
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Multi-Cloud Cost Estimatorpro
Estimate and compare cloud costs across providers
cloudcostawsgcp
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