Diff
.env Diff
Compare environment files by variable keys and raw lines.
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All tools
138 browser-only utilities. No account required.
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Saved in this browser. Add as many as you want — each tool is stored once.
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Recently used
The last 6 tools you opened in this browser, newest first.
Docker & DevOps
.env Generator
Turn JSON or keys into a .env file.
Git & GitHub
.gitignore Generator
Build a .gitignore from stack names.
AI
AI Markdown Formatter
Normalize Markdown headings and lists for LLM-friendly documents.
AI
AI Response Diff
Compare two model responses line by line.
AI
Anthropic Message Formatter
Format prompts into an Anthropic Messages API payload.
Encoding & Text
Base64 Decoder
Decode Base64 into text.
Encoding & Text
Base64 Encoder
Encode text as Base64.
JWT & Security
BCrypt Generator / Verifier
Hash or verify passwords with PBKDF2-SHA-256 in the browser.
Encoding & Text
Character Counter
Count characters and frequencies.
Web & API
CORS Checker
Probe a URL for Access-Control headers from your browser.
Date & Time
Cron Expression Explainer
Explain a 5-field cron expression.
Date & Time
Cron Expression Generator
Build a 5-field cron expression.
JSON & Data
CSV → JSON
Parse CSV into a JSON array.
Web & API
cURL → JavaScript
Translate curl into fetch().
Web & API
cURL → PHP
Translate curl into PHP curl_*.
Web & API
cURL → Python
Translate curl into Python requests.
Web & API
cURL Generator
Build a curl command from JSON.
Date & Time
Date Difference Calculator
Duration between two timestamps.
SQL & Database
DB Connection String Parser
Parse Postgres/MySQL URLs or KEY=value strings.
Docker & DevOps
Docker Compose Generator
Scaffold a Compose service.
Docker & DevOps
Docker Image Size Calculator
Sum layer sizes from pasted docker output.
Docker & DevOps
Dockerfile Generator
Generate a starter Dockerfile.
Docker & DevOps
Environment Variable Formatter
Normalize, quote, and sort env lines.
Git & GitHub
Git Branch Name Generator
Slug a description into feature/branch.
Git & GitHub
Git Cheat Sheet Generator
Generate a printable Git cheat sheet by experience level — copy, print, or download PDF.
Git & GitHub
Git Command Builder
Pick a common Git task and get a safe, copy-paste command sequence.
Git & GitHub
Git Command Generator
Turn an action into a git command.
Git & GitHub
Git Commit Message Generator
Build a conventional commit subject.
Git & GitHub
Git Diff Viewer
Diff two texts or inspect a unified diff.
Git & GitHub
Git Merge Helper
Generate merge commands for two branches.
Git & GitHub
Git Rebase Helper
Generate rebase commands onto a branch.
Git & GitHub
GitHub Actions YAML Generator
Scaffold a CI workflow.
Git & GitHub
GitHub Clone Command Generator
Build git clone for HTTPS or SSH.
Git & GitHub
GitHub Markdown Preview
Render Markdown to HTML in the browser.
Git & GitHub
GitHub README Generator
Create a README from a name and description.
Git & GitHub
GitHub URL Parser
Parse owner, repo, and clone URLs.
JWT & Security
HMAC Generator
HMAC-SHA-256 a message with a secret.
Encoding & Text
HTML Decoder
Unescape HTML entities.
Encoding & Text
HTML Encoder
Escape HTML entities.
Web & API
HTTP Header Parser
Parse raw HTTP headers into JSON.
JWT & Security
HTTP Security Headers Checker
Score pasted response headers against a baseline.
Web & API
HTTP Status Code Lookup
Look up HTTP status codes and phrases.
Encoding & Text
Images to PDF
Combine JPEG, PNG, WebP, or GIF images into one PDF in your chosen order.
Date & Time
ISO 8601 Converter
Normalize a date to ISO-8601 UTC.
JSON & Data
JSON → CSV
Turn a JSON array of objects into CSV.
AI
JSON → Prompt
Turn JSON context into a readable user prompt with fenced blocks.
SQL & Database
JSON → SQL INSERT
Build INSERT statements from JSON rows.
JSON & Data
JSON → YAML
Convert JSON into YAML.
Diff
JSON Diff
Compare two JSON documents with path-level changes and a formatted line diff.
Encoding & Text
JSON Escape / Unescape
Turn text into a JSON string (or back).
JSON & Data
JSON Formatter
Format and beautify JSON online for free.
JSON & Data
JSON Minifier
Remove whitespace from JSON.
AI
JSON Schema → TypeScript
Generate TypeScript types from a JSON Schema object.
AI
JSON Schema → Zod
Generate Zod schemas from JSON Schema for runtime validation.
JSON & Data
JSON Schema Generator
Infer a JSON Schema from an example.
JSON & Data
JSON Schema Validator
Validate an instance against a JSON Schema.
JSON & Data
JSON Validator
Check whether a payload is valid JSON.
JSON & Data
JSON Viewer
Inspect JSON with types annotated.
JSON & Data
JSONPath Tester
Query JSON with a JSONPath expression.
JWT & Security
JWT Decoder
Decode a JWT header and payload without verifying.
JWT & Security
JWT Expiry Checker
See whether a JWT exp claim is still valid.
JWT & Security
JWT Generator
Create an unsigned or HS256-signed JWT.
JWT & Security
JWT Inspector
Inspect JWT claims and timestamps.
Docker & DevOps
Kubernetes Resource Validator
Check apiVersion, kind, and metadata.name.
Docker & DevOps
Kubernetes YAML Generator
Generate Deployment and Service YAML.
AI
LLM Context Window Calculator
See how much context budget remains for common models.
AI
LLM JSON Validator
Validate JSON from model output, including ```json fences.
Encoding & Text
Lorem Ipsum Generator
Generate placeholder paragraphs.
Diff
Markdown Diff
Diff Markdown source line by line (optional trim trailing spaces).
MCP
MCP Inspector
Inspect an MCP tool definition — name, description, input schema, and parameter types.
MCP
MCP JSON-RPC Tester
Validate and pretty-print JSON-RPC 2.0 messages used by MCP.
MCP
MCP Server Config Generator
Generate MCP server configuration snippets for Cursor, Claude Desktop, and other clients.
MCP
MCP Tool Schema Generator
Build an MCP tool definition with name, description, and typed parameters.
Docker & DevOps
Mermaid Diagram Editor
Write Mermaid.js diagrams with a live preview, starter templates, and SVG export.
SQL & Database
MySQL Connection String Generator
Build a mysql:// URL from JSON fields.
IDs & Random Data
NanoID Generator
Generate compact URL-friendly IDs.
AI
OpenAI Message Formatter
Format plain or tagged text into an OpenAI chat payload.
AI
OpenAPI → LLM Tool Schema
Convert OpenAPI operations into OpenAI function/tool definitions.
Web & API
OpenAPI Viewer
List paths and methods from an OpenAPI document.
IDs & Random Data
Password Generator
Generate a random password in your browser.
JWT & Security
Password Hash Generator
Hash a password with SHA-256, SHA-512, or PBKDF2.
JWT & Security
Password Text Cipher
Encrypt and decrypt text with a case-sensitive password using AES-256-GCM in your browser.
SQL & Database
PostgreSQL Connection String Generator
Build a postgres:// URL from JSON fields.
AI
Prompt → JSON
Parse role-tagged prompts or headings into structured JSON.
AI
Prompt Diff
Compare two prompts before you send them to a model.
AI
Prompt Formatter
Normalize spacing and paragraph breaks in LLM prompts.
AI
Prompt Token Counter
Estimate token count for a prompt without sending it to an API.
Web & API
Query String Parser
Parse URL query parameters.
IDs & Random Data
Random Number Generator
Generate random integers in a range.
IDs & Random Data
Random String Generator
Generate a random string from an alphabet.
Regex
Regex Escape Tool
Escape regex metacharacters in a literal.
Regex
Regex Explainer
Explain tokens in a regular expression.
Regex
Regex Formatter
Break a pattern onto multiple lines.
Regex
Regex Generator
Escape a literal or pick a common preset.
Regex
Regex Tester
Run a regular expression against a string.
Date & Time
Relative Time Calculator
Say how long ago (or until) a date is.
Encoding & Text
ROT13 Cipher
Rotate ASCII letters A–Z and a–z by thirteen positions.
Encoding & Text
ROT18 Cipher
Apply ROT5 to digits and ROT13 to letters in one pass.
Encoding & Text
ROT47 Cipher
Rotate printable ASCII from ! through ~ by forty-seven positions.
Encoding & Text
ROT5 Cipher
Rotate decimal digits 0–9 by five positions.
Encoding & Text
SHA-256 Generator
SHA-256 hash text in the browser.
JWT & Security
SHA-256 Hash
SHA-256 digest for security payloads.
JWT & Security
SHA-512 Generator
SHA-512 hash text in the browser.
Encoding & Text
Slug Generator
Turn a title into a URL slug.
Web & API
Social Video Downloader
Download public videos from YouTube, Facebook, Instagram, or X with previews and quality options.
SQL & Database
SQL → JSON
Extract columns from INSERT or SELECT.
SQL & Database
SQL Beautifier
Pretty-print SQL for reading.
Diff
SQL Diff
Format both SQL statements, then diff lines to spot query changes.
SQL & Database
SQL Formatter
Indent SQL and uppercase keywords.
SQL & Database
SQL Minifier
Strip comments and extra whitespace from SQL.
SQL & Database
SQL Query Builder
Build a SELECT from a JSON description.
Encoding & Text
String Escape / Unescape
Escape or unescape string literals.
AI
Structured Output Schema Generator
Infer a strict JSON Schema for structured LLM outputs.
AI
System Prompt Builder
Build a system prompt from JSON fields or a one-line goal.
Encoding & Text
Text Case Converter
Convert between camel, snake, kebab, and more.
Diff
Text Diff
Line-by-line diff for plain text, logs, or any string.
Date & Time
Timezone Converter
Format a timestamp in two IANA zones.
AI
Token/Cost Calculator
Estimate USD cost from input and output token counts.
IDs & Random Data
ULID Generator
Generate time-sortable ULIDs.
Encoding & Text
Unicode Converter
Show code points and UTF-8 bytes.
Date & Time
Unix Timestamp Converter
Convert unix time, millis, or date strings.
Date & Time
Unix Timestamp Generator
Emit the current unix time.
Encoding & Text
URL Decoder
Decode percent-encoded text.
Diff
URL Diff
Break URLs into components and highlight what changed.
Encoding & Text
URL Encoder
Percent-encode text for URLs.
Web & API
URL Parser
Split an absolute URL into parts.
Web & API
User-Agent Parser
Extract browser and OS from a UA string.
IDs & Random Data
UUID Generator
Generate RFC 4122 version 4 UUIDs.
IDs & Random Data
UUID Validator
Check a canonical UUID string.
IDs & Random Data
UUID Version Detector
Read the version and variant of a UUID.
Encoding & Text
Word Counter
Count words, lines, and sentences.
JSON & Data
XML → JSON
Convert XML into JSON.
Diff
XML Diff
Compare XML after parsing to a tree, with formatted line diff.
JSON & Data
XML Formatter
Pretty-print XML.
JSON & Data
XML Validator
Check XML well-formedness in the browser.
JSON & Data
YAML → JSON
Convert YAML into JSON.
Diff
YAML Diff
Parse two YAML files, compare structure, and show a normalized line diff.