Your everyday toolbox
Free tools for converting, encoding, formatting and calculating. Most run privately in your browser.
Popular
.env Validator
Paste an env file and instantly find duplicate keys, invalid ports, malformed database URLs, broken flags, and other common configuration mistakes.
Security ToolsBase64 Encode/Decode
Encode and decode Base64 strings.
Encoders / DecodersColor Picker
Pick a color and convert it to any format.
Image ToolsCompress PDF
Reduce PDF file size by compressing images, right in your browser.
PDF ToolsCSV Viewer
Parse and display CSV data in a table format.
Developer ToolsCVE Explorer
Fetch details for a specific Common Vulnerabilities and Exposures (CVE) ID.
Security ToolsDockerfile Builder
Visually create and edit Dockerfiles without writing code.
Developer ToolsFuzzy Domain Finder
Generate and analyze variants of a domain name to find potential phishing or typosquatting threats.
Security ToolsAll tools
147.env Validator
Paste an env file and instantly find duplicate keys, invalid ports, malformed database URLs, broken flags, and other common configuration mistakes.
Security ToolsBase64 Encode/Decode
Encode and decode Base64 strings.
Encoders / DecodersColor Picker
Pick a color and convert it to any format.
Image ToolsCompress PDF
Reduce PDF file size by compressing images, right in your browser.
PDF ToolsCSV Viewer
Parse and display CSV data in a table format.
Developer ToolsCVE Explorer
Fetch details for a specific Common Vulnerabilities and Exposures (CVE) ID.
Security ToolsDockerfile Builder
Visually create and edit Dockerfiles without writing code.
Developer ToolsFuzzy Domain Finder
Generate and analyze variants of a domain name to find potential phishing or typosquatting threats.
Security ToolsHTML to PDF
Convert a webpage or raw HTML into a downloadable PDF.
ConvertersHTTP Status Codes
Complete reference for all HTTP status codes with descriptions, use cases, and MDN links.
Network ToolsImage Converter
Convert images between PNG, JPEG, WebP, and AVIF formats.
Image ToolsIP Information
Lookup IP address geolocation and details.
Network ToolsJPG to PDF
Combine JPG, PNG and other images into a PDF.
PDF Toolsjq Playground
A playground for the jq command-line JSON processor.
Developer ToolsJSON ↔ CSV
Convert data between JSON and CSV formats.
ConvertersJSON ↔ XML
Convert data between JSON and XML formats.
ConvertersJSON Formatter
Format, validate, and beautify your JSON data.
Developer ToolsJWT Encoder/Decoder
Encode and decode JSON Web Tokens.
Encoders / DecodersKnown Bot Checker
Check if an IP address belongs to a known bot or service.
Network ToolsLLM Model Explorer
Browse and compare features of different Large Language Models.
Developer ToolsMarkdown Viewer
View and render Markdown to HTML, with download options.
Text ToolsMCP Config Generator
Generate Model Context Protocol (MCP) server configs for Claude Desktop, Claude Code, Cursor, VSCode, and Windsurf.
Developer ToolsMerge PDF
Combine multiple PDF files into one document.
PDF ToolsMock Data Generator
Create realistic mock data by type or from a schema using AI.
Developer ToolsMortgage Calculator
Calculate your monthly mortgage payments.
Financial ToolsPassword Generator
Create strong, secure, and random passwords.
Security ToolsPDF to JPG
Convert PDF pages to JPG or PNG images.
PDF ToolsPrompt Library
A collection of curated, optimized prompts for various LLM tasks.
Developer ToolsPrompt Optimizer
Refine and shorten your LLM prompts with AI to reduce token usage.
Developer ToolsQR Code Generator
Generate QR codes from text or URLs.
Developer ToolsRegex Tester
Test and debug regular expressions, with AI assistance.
Developer ToolsSentiment Analyzer
Analyze the sentiment and emotions within a block of text.
Text ToolsShare Secret
Share a secret with a password-protected, encrypted link.
Security ToolsSIP/SWP Calculator
Plan your investments to meet future withdrawal needs.
Financial ToolsSplit PDF
Extract pages or split a PDF into multiple files.
PDF ToolsSQL Playground
Run SQL queries against CSV data directly in your browser.
Developer ToolsStock Average Calculator
Calculate the average price of your stock holdings.
Financial ToolsStock Data
Fetch near real-time stock data for any ticker symbol.
Financial ToolsSubnet Calculator
Calculate and visualize IP subnets.
Network ToolsTime Converter
Compare times across multiple timezones visually.
CalculatorsTimestamp ↔ Date
Convert between Unix timestamps and human-readable dates.
CalculatorsUnit Converter
Convert between various units like length, mass, and temperature.
CalculatorsVesting Schedule Calculator
Analyze and visualize your stock vesting timeline.
Financial ToolsWorld Clock
View analog clocks for different timezones.
Calculators.gitignore Generator
Combine language, framework, editor and OS templates into one .gitignore file.
Developer Tools401(k) Calculator
Project your 401(k) balance with employer match and IRS limits.
Financial ToolsAdd Page Numbers to PDF
Insert page numbers into a PDF with custom position and style.
PDF ToolsAgent Wallet Simulator
Give AI agents a fake-money wallet with spend limits and approvals, then watch every transaction live. No real money.
Developer ToolsAPI Rate Limit Calculator
Calculate and visualize API rate limits across different time windows.
CalculatorsAuto Loan Calculator
Estimate your monthly car loan payments.
Financial ToolsBandwidth Calculator
Estimate data transfer times based on file size and network speed.
Network ToolsBase32 / Hex / ASCII Encoder
Encode and decode text as Base32, hexadecimal or ASCII character codes.
Encoders / DecodersBinary ↔ Text
Convert text to binary code and vice versa.
Encoders / DecodersCalculator
A simple calculator for basic arithmetic.
CalculatorsCap Table Calculator
Model startup ownership, dilution, SAFEs and exit payouts.
Financial ToolsCase Converter
Convert text between different case styles like camelCase, snake_case, etc.
Text ToolsCertificate & CSR Decoder
Decode PEM certificates and CSRs: subject, issuer, validity, SANs, key usage, extensions and fingerprints.
Security Toolschmod Calculator
Convert Unix file permissions between checkboxes, octal, symbolic and chmod commands.
CalculatorsChurn Rate Calculator
Calculate customer churn, revenue churn, NRR and LTV.
Financial ToolsCloud Explorer
Visually explore cloud provider regions and availability zones.
Network ToolsCoin Flip & Dice Roll
Quickly generate a random result for a coin flip or a dice roll.
Developer ToolsColor Contrast Checker
Check the WCAG 2.2 contrast ratio between text and background colors, with AA/AAA results and the nearest passing color.
Image ToolsColor Palette Picker
Generate and explore harmonious color palettes.
Image ToolsCompound Interest Calculator
Calculate compound interest on an investment.
Financial ToolsCompromised CA & Revocation Checker
Test whether your browser or client trust store blocks compromised intermediate CAs (such as the October 2026 eMudhra incident) and revoked certificates.
Security ToolsCountdown Clock
Set a timer that counts down to zero.
CalculatorsCredit Card Generator
Generate valid test credit card numbers.
Developer ToolsCron Job Explainer
Translate cron schedule strings into human-readable descriptions.
Developer ToolsCSP Generator
Generate Content Security Policy headers.
Security ToolscURL to Code Converter
Convert curl commands into JavaScript, Python, Go, PHP or Rust code.
ConvertersDNS Lookup
Query DNS records for any domain using Google or Cloudflare.
Network ToolsDocument to Markdown Converter
Convert PDF, Word, Excel, OpenDocument, CSV, HTML and image files to clean Markdown, up to five at a time.
ConvertersEmail Authentication Checker (SPF, DKIM, DMARC)
Check a domain's SPF, DKIM, DMARC, BIMI, MTA-STS and TLS-RPT records in one pass, with a score and fixes for every problem found.
Security ToolsEXIF Viewer and Remover
See the hidden metadata in a photo, including GPS location, and remove it without losing quality.
Image ToolsFavicon Generator
Turn one image into favicon.ico, PNG icons, an Apple touch icon, a maskable icon and a web app manifest.
Image ToolsFind and Replace
Find and replace text within a larger body of content.
Text ToolsFolder Map Generator
Select a folder to generate a text-based tree map of its contents.
Developer ToolsGrok Debugger
Parse and debug Grok patterns against log data.
Developer ToolsHash Generator
Generate hashes (MD5, SHA-1, SHA-256, etc.).
Encoders / DecodersHMAC & Bcrypt Generator
Generate and verify HMAC signatures and bcrypt password hashes in your browser.
Security ToolsHTML Escape / Unescape
Escape and unescape HTML entities instantly.
Encoders / DecodersHTML, CSS & JavaScript Formatter and Minifier
Beautify or minify HTML, CSS and JavaScript (plus SCSS, Less and TypeScript formatting) with size and gzip savings shown.
Developer ToolsImage Compressor
Shrink image file size and compare the result side by side with the original before you download.
Image ToolsImage Resizer
Resize and compress JPEG, PNG, and WebP images to reduce file size.
Image ToolsImage to Text (OCR) & AI Image Describer
Extract text from screenshots, photos and scans, write alt text or a description of any image, and list the objects in it.
Image ToolsIP Address Generator
Generate random IP addresses for a specified country.
Network ToolsJSON ↔ TOML
Convert data between JSON and TOML formats.
ConvertersJSON ↔ YAML
Convert data between JSON and YAML formats.
ConvertersJSON Modifier
Selectively filter keys from a JSON object.
Developer ToolsJSON Schema Validator & Generator
Validate JSON against a JSON Schema with every error listed by path, or generate a schema from sample JSON.
Developer ToolsJSON Structural Diff
Compare two JSON documents by their data, not their formatting: added, removed and changed keys, with key order and whitespace ignored.
Developer ToolsJSON to TypeScript
Generate TypeScript interfaces, Zod schemas, Go structs, Pydantic models, or JSON Schema from JSON.
ConvertersJWK / JWKS Generator
Generate JWK and JWKS key sets for RS256, ES256, ES512, HS256, and HS512.
Security ToolsLLM API Cost Calculator
Estimate and compare AI API costs across GPT, Claude, Gemini and more.
Developer ToolsLLM Shield
Obfuscate text to make it difficult for AI to parse while remaining human-readable.
Security ToolsLorem Ipsum Generator
Generate placeholder text in words, sentences, or paragraphs.
Text ToolsMAC Address Generator
Generate random MAC addresses with custom formats.
Network ToolsMarkdown Table Generator
Generate Markdown tables with a visual grid editor.
ConvertersMeme Generator
Upload a photo or pick one from the gallery, add captions and emoji, apply filters, and download your meme.
Image ToolsMeta Tags Generator
Generate HTML meta tags for SEO and social media sharing.
Developer ToolsNumber Base Converter
Convert between binary, octal, decimal and hex at 8 to 128 bits, with signed two's complement and an editable bit grid.
ConvertersNumber Picker Wheel
A spinning wheel to pick a random number from a range.
Developer ToolsOpen Ports Lookup
See which ports and services an IP address or hostname exposes to the internet, with known CVEs — without scanning it.
Security ToolsOpenAPI to JSON Schema
Convert OpenAPI 3.0, 3.1, and Swagger 2.0 schemas, request bodies, and responses to standalone JSON Schema.
ConvertersOrganize PDF Pages
Reorder, delete and rotate PDF pages visually.
PDF ToolsOTP Generator
Generate and verify Time-Based One-Time Passwords (TOTP).
Security ToolsPercentage Calculator
Calculate percentages, fractions, and discounts.
CalculatorsProfit/Loss Calculator
Calculate profit or loss from a transaction, including margin and ROI.
Financial ToolsRAID Calculator
Calculate storage capacity and redundancy for various RAID levels.
CalculatorsRate Limiter Simulator
Get a free URL backed by a real token bucket. Hit it with curl and watch it drain and refill live.
Network ToolsRedirect Checker & HTTP Header Tracer
Follow a URL through every redirect and see each hop's status code, Location, response headers and timing.
Network ToolsRobots.txt Generator
Generate a valid robots.txt file with a visual rule builder.
Network ToolsRotate PDF
Rotate all or selected PDF pages and save the result.
PDF ToolsRSA Key Generator
Generate public and private RSA key pairs.
Security ToolsRunway & Burn Rate Calculator
Project cash runway, burn rate and when you need to raise.
Financial ToolsSecurity Headers Checker
Analyze HTTP response headers for security.
Security ToolsSemVer Comparator & Range Checker
Compare two semantic versions to see which is newer, or check whether a version satisfies an npm-style range like ^1.2.3 or >=1.0.0 <2.0.0.
Developer ToolsSet Operations
Perform set operations like union and intersection on two lists.
Text ToolsSlug Generator
Convert text into URL-friendly slugs with customizable separators and case options.
Text ToolsSort List
Sort a list of items alphabetically, by length, or randomly.
Text ToolsSpeech to Text
Transcribe audio or a recording to text and subtitles (SRT, VTT) with Whisper.
Text ToolsSQL Formatter
Format and beautify your SQL queries.
Developer ToolsSRI Hash Generator
Generate Subresource Integrity hashes for scripts and stylesheets.
Security ToolsStopwatch
Measure elapsed time with lap functionality.
CalculatorsString Escape / Unescape
Escape or unescape strings, including Unicode sequences.
Encoders / DecodersString Reverser
Reverse the characters in any given string.
Text ToolsSubdomain Finder
Discover a domain's subdomains from public Certificate Transparency logs and check which ones are still live.
Security ToolsText Diff Checker
Compare two text files and highlight the differences.
Text ToolsText Embedding Generator
Generate vector embeddings for text and compare semantic similarity.
Developer ToolsText Statistics
Count characters, words, sentences, lines, and paragraphs.
Text ToolsText to ASCII Art Generator
Convert plain text into ASCII art using various fonts.
Text ToolsText to Speech
Turn text into natural-sounding speech with 40+ AI voices and download it as MP3.
Text ToolsTLS/SSL Certificate Checker
Check a domain's SSL/TLS certificate details.
Security ToolsToken Counter
Estimate the token count for text with various LLM models.
CalculatorsUptime Checker
Check if a website is online and view its status in real-time.
Network ToolsUptime/Downtime Calculator
Calculate service uptime and downtime based on SLA percentages.
CalculatorsURL Encode/Decode
Encode and decode strings for URL-safe usage.
Encoders / DecodersURL to Markdown & Web Scraper
Convert any web page or PDF link to clean Markdown, list every link on a page, or scrape text and attributes with CSS selectors.
Network ToolsUser-Agent Utility
Parse, analyze, and generate User-Agent strings.
Network ToolsUTM URL Generator
Build campaign URLs with UTM parameters for Google Analytics and other analytics tools.
Developer ToolsUUID Generator
Generate universally unique identifiers.
Developer ToolsWatermark PDF
Add a text watermark like CONFIDENTIAL or DRAFT to PDF pages.
PDF ToolsWebcam & Microphone Test
Check your camera, microphone and speakers before a call: live preview, resolution and frame rate, mic level meter, live captions and speech-to-text.
Developer ToolsWebhook Signature Verifier
Verify a webhook signature from GitHub, Stripe, Slack, Shopify or any HMAC-based provider, or compute the signature for a test payload.
Security ToolsWebhook Tester
Get a free temporary webhook URL and inspect every request it receives, live: method, headers, query, and body.
Network ToolsWebsite Screenshot
Capture a screenshot of any website on desktop, tablet, or mobile, including full-page captures.
Network ToolsYAML ↔ TOML
Convert data between YAML and TOML formats.
Converters