Free Developer Tools & Online Utilities
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Generate Architecture Decision Records from a template.
Visualize and count tokens for GPT, Claude, and Gemini models.
Generate secure Argon2 password hashes
Verify passwords against Argon2 hashes
Decode and inspect Azure Shared Access Signature tokens.
Text ↔ Base64
Convert between camelCase, snake_case, kebab-case and more.
Analyze and inspect X.509 certificates
Visualize and compare multiple CIDR ranges side by side.
Visualize circuit breaker state transitions and failure patterns.
Create PNG/JPEG/WEBP from code with highlighting and theme
Let the coin flipper randomly pick between two options when you can't decide.
Convert between JSON, YAML, TOML, XML
Parse cron expressions and see next execution times
Detect column types and schema from CSV data.
Build curl commands visually with headers, auth, and body options.
Inspect Received hops and auth results
Generate fake JWT/OAuth tokens for development and testing.
Create favicon sets from an image
Calculate SHA-1, SHA-256, SHA-384, SHA-512 checksums of any file.
Formatting for JSON, XML, YAML, TOML, SQL
Generate entertaining and creative branch names for your repos.
Compose .gitignore files from common templates.
Cleans copied ChatGPT / AI text
Compress & decompress (Gzip)
Compute hash from text
Pick HEX/RGB/HSL, check contrast, and keep a palette
Encode & decode HTML entities
Parse and inspect Set-Cookie and Cookie headers.
Look up and understand HTTP status codes.
Create HTTPS certificates signed by your Root CA
Reduce / optimize image size
Change format between PNG/JPG/WebP
Convert images to/from Base64
Detect and highlight invisible Unicode characters hidden in text.
Calculate subnet mask, network, broadcast and more from IP/CIDR notation.
Flatten nested JSON to dot notation or unflatten back to nested structure.
Generate JSON Schema from sample JSON data.
Validate JWT signatures with HMAC and RSA keys.
Decode, validate and inspect JWT tokens
Generate open source license files (MIT, Apache, GPL, BSD, ISC and more).
Format text for LinkedIn posts with bold, italic, and more
Generate placeholder text
Live preview with GFM support
Build SQL Server connection strings with a visual form.
Build OpenAI function/tool definitions visually.
Interactive editor for OpenAPI 3.x and Swagger 2.0 specs with live documentation preview.
Design professional HTML email signatures for Outlook.
Generate secure passwords
Write and preview PlantUML diagrams in the browser.
Generate QR code from text
Simulate and visualize RAG chunking strategies.
Simulate API rate limiting with token bucket and sliding window algorithms.
Explain regex patterns and preview matches
Create a self-signed Root Certificate Authority
Parse, compare, and bump semantic versions.
Convert between bytes, KB, MB, GB, TB and binary/decimal units.
Optimize and minify SVG files.
Convert SVG markup into React/TSX components.
Edit and validate Swagger/OpenAPI 2.0 definitions.
Compare two text blocks
MD5 / SHA hashing
Generate Mermaid diagrams from plain text
Convert schedule times into cron expressions
Calculate the exact difference between two timestamps or dates.
Calculate token counts and costs for LLM API calls.
Convert JSON, YAML, TOML to TOON format
Normalize Unicode text to NFC, NFD, NFKC or NFKD forms.
Safely encode & decode URLs
Generate random UUID
Validate JSON, XML, YAML, TOML