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Assistant
Chat with a local AI assistant, mask PII with OpenAI Privacy Filter, or use marked external free-tier endpoints like NVIDIA NIM, Groq, and OpenRouter.
Tools Collection
A collection of open-source useful tools for everyday tasks.
Showing all 139 tools
AI
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Background Remover
Remove backgrounds from portrait images using AI (MODNet) directly in your browser. Best for photos with people.
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Semantic Search
Build a local semantic search index over your documents using sentence embeddings (MiniLM, BGE, E5, MPNet). Cosine similarity ranking, multiple model sizes, JSON export โ all runs in your browser.
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Translate
Translate text between 100 languages using AI (M2M-100) directly in your browser. Supports speech input for voice-to-text translation.
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Whisper STT
Transcribe audio to text using OpenAI Whisper running locally in your browser. Supports file upload and microphone recording, transcription or translation, multiple languages, and word-level timestamps. All processing runs client-side.
Converters
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.env Converter
Convert .env files to JSON, YAML, TOML, docker-compose, Kubernetes ConfigMap/Secret, GitHub Actions, docker run flags, or shell exports, and flatten nested JSON/YAML/TOML back into .env. Handles quotes, multi-line values, ${VAR} expansion, duplicates, secret masking, and .env.example generation
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Bitwise
Perform bitwise operations (AND, OR, XOR, NOT, shifts) with visual bit representation
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Chmod
Calculate Unix file permissions with an interactive grid. Convert between octal (755) and symbolic (rwxr-xr-x) notation, set SetUID/SetGID/sticky bits, and generate chmod commands, ls -l output, and umask
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Cron
Parse, build, and visualize cron expressions. Includes next/previous run lists, a visual builder, and a heatmap visualizer (day-of-week ร hour) with optional A/B comparison of two expressions over 7 days, 30 days, or 1 year.
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Currency Exchange
Convert between world currencies using live ECB exchange rates with multi-currency output, historical line chart, and rate lookup dating back to 1999
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Data Converter
Convert between JSON, YAML, TOML, TOON, XML, INI, CSV, and Properties formats with customizable indentation and key sorting
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Document Converter
Convert documents between Markdown, HTML, DOCX, EPUB, RTF, ODT, LaTeX, reStructuredText, DocBook, AsciiDoc, Org Mode, and more using Pandoc WASM in the browser
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Formatter
Format and prettify JSON, YAML, TOML, Markdown, CSS, HTML, XML, CSV, and SQL (multiple dialects) with customizable indentation
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JSON Toolkit
Query JSON with JSONPath filters, validate against JSON Schema (Draft 2020-12 / Draft-07) with detailed errors, infer schemas, and generate TypeScript interfaces, Go structs, or Rust serde structs from sample data
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Julian Date
Convert between Julian Date and calendar date
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Luwi
Parse text files using custom Lua scripts powered by WebAssembly - define flexible parsing rules with tag-based filtering
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Media Converter
Convert images, videos, and audio files between formats using ImageMagick and FFmpeg WASM, running entirely in your browser
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Number Base
Convert numbers between bases (binary, octal, decimal, hex) and Roman numerals
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Semver
npm-compatible semantic version calculator: check which versions satisfy a range (^, ~, x, hyphen, ||) with plain-English explanation, fetch real versions from the npm registry, compare and sort versions, and compute next major/minor/patch/prerelease
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SQLite Studio
Open, inspect, query, edit, and export SQLite database files directly in the browser with a schema explorer, SQL editor, result tables, and CSV or JSON export
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Timestamp
Convert Unix timestamps to human-readable dates and formats
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Unit Converter
Convert between 200+ units across length, weight, temperature, speed, area, volume, data storage, time, pressure, energy, power, frequency, and angle categories
Electronics
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555 Timer
NE555 timer calculator for astable (frequency, duty cycle, high/low time with waveform) and monostable (pulse width) modes, plus R1/R2 design from a target frequency and duty cycle
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Battery Life
Estimate battery life from capacity and current draw, with duty-cycle profiles (sleep / wake / transmit) for IoT devices, capacity derating, self-discharge, and presets for CR2032, AA, 18650, and LiPo
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Capacitor Code
Decode capacitor markings (104, 4R7, 2n2, 2A104J) to pF / nF / ยตF with tolerance letter and EIA voltage code, or encode a capacitance into its 3-digit code. Includes common values table
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Filter Cutoff
Calculate cutoff frequency of RC and RL (1st order) and LC (2nd order) low-pass and high-pass filters, or solve for R, C, or L from a target frequency with E-series values. Includes Bode magnitude plot, phase, and time constant
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LED Resistor
Calculate the current-limiting resistor for single, series, or parallel LEDs with color presets. Picks the next standard E-series value and recommends a resistor power rating
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Ohm's Law
Enter any two of voltage, current, resistance, or power to calculate the other two. Accepts SI prefixes (4.7k, 20m, 100ยต) and shows the formula used
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PCB Trace Width
IPC-2221 PCB trace width calculator: minimum width for a current or maximum current for a width on external and internal layers, with copper weight, temperature rise, trace resistance, voltage drop, and power loss
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Resistor Color Code
Decode resistor color bands to ohms or encode a resistance value into bands. Supports 4-band and 5-band resistors with tolerance, live resistor preview, and a full color code reference table. Accepts inputs like 4.7k, 220, 1M, and European style 4k7.
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Voltage Divider
Calculate resistive voltage divider output with optional load, solve for R2, or find the best standard E-series R1/R2 pairs for a target voltage with error and current
Encoders / Decoders
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AES Encrypt / Decrypt
Encrypt and decrypt text using AES-256-CBC, AES-256-CTR, and AES-256-GCM. Supports password-based key derivation (PBKDF2) and raw key/IV input with Base64 and Hex output formats. All operations run client-side in the browser.
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Base Encoding
Encode and decode Base64, Base62, Base58, Base32, and Base85 (Ascii85) strings
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Basic Auth
Encode and decode HTTP Basic Authentication headers
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Hex Viewer
View hex dump of text, files, or Base64 data. Compare two files byte-by-byte with diff highlighting.
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HTML
Encode and decode HTML entities
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JWT
Encode and decode JSON Web Tokens
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Luhn
Validate credit card numbers using the Luhn algorithm
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Morse Code
Encode text to Morse code or decode Morse code to text with visual flash playback
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PGP
Generate PGP key pairs, encrypt and decrypt messages, sign and verify signatures using OpenPGP. All operations run client-side in the browser.
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Sound Transfer
Transfer files and data between devices using sound waves with multiple protocols including ultrasonic for privacy
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Steganography
Hide text or files inside PNG images using LSB steganography. Configurable bits per channel (1โ4) and channel selection (R/G/B/A). Optional AES-GCM encryption with PBKDF2 password derivation. Includes capacity meter and pixel-difference visualization. All processing runs client-side in the browser.
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URL
Encode and decode URL components
Generators
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Argon2 / Scrypt
Hash passwords with modern memory-hard KDFs: Argon2id, Argon2i, Argon2d, and scrypt. Configurable parameters with Light / OWASP 2023 / Strong profiles, salt input (random / utf-8 / hex), encoded / hex / base64 output, timing display, and Argon2 verification of existing $argon2โฆ$ encoded hashes. All computation runs in WebAssembly in your browser.
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Barcode
Generate and scan barcodes and QR codes, plus offline file transfer over an animated QR stream
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Bcrypt
Generate bcrypt and Apache MD5 password hashes with htpasswd support
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Fake Data
Generate fake data for testing with names, emails, addresses, and more
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Hash
Generate MD5, SHA-1, SHA-256, SHA-512 hashes with HMAC support
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ID
Generate UUIDs (v1, v4, v7), ULIDs, Nano IDs, CUID2s, and KSUIDs
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License
Generate LICENSE files for GitHub projects with MIT, Apache 2.0, GPL 3.0, BSD (3/2/0-clause), ISC, MPL 2.0, and Unlicense templates, including permissions, conditions, and limitations summary
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Password
Generate secure random passwords with customizable options
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RSA Key
Generate RSA public and private key pairs
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TOTP
Generate and verify Time-based One-Time Passwords for two-factor authentication
Graphics
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Color Picker
Pick colors, convert between formats, and generate harmonious palettes
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Contrast Checker
Check WCAG color contrast ratios for accessibility compliance
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CSS Pattern
Create repeating CSS background patterns with visual editor, animations, layering support, and custom SVG shapes
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Favicon Generator
Create favicons from icons with customizable colors, shapes, and sizes. Browse Lucide and Simple Icons libraries or upload your own SVG, with search, live preview, and export to PNG, ICO, and SVG
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Gradient Generator
Create CSS linear and radial gradients with visual editor and code output
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Image Compressor
Compress JPEG and PNG images to reduce file size
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Image Metadata
View and remove EXIF metadata from images for privacy
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Image Resizer
Compose, resize, crop, rotate, and export multiple images with background control
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Image to Base64
Convert images to Base64 data URIs and decode Base64 back to images
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Media Viewer
View images, play videos and audio with speed control, subtitles (SRT/VTT), keyboard shortcuts, picture-in-picture, and casting support
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OG Preview
Preview how your page will look when shared on Twitter, Facebook, LinkedIn, Discord, and Slack. Edit Open Graph and Twitter Card meta tags with live platform-specific preview cards and validation
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Placeholder Image
Generate placeholder images with custom dimensions, colors, and text
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Shadow Generator
Generate CSS box-shadow and text-shadow with visual preview
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SVG Viewer
View, edit, transform, and optimize SVG images with live preview. Rotate, flip, change dimensions, prettify, optimize with SVGO, and export to PNG, JPG, Data URI, and React Native components. All processing runs client-side.
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Video Editor
Edit multiple videos and audio in the browser with scrollable multi-row timelines, draggable/reorderable clips, gap-preserving trims, basic video effects, detachable split/mute audio, waveform previews, transparent text, rotatable SVG/image overlays, motion keyframes, social output sizes, color bars, and local FFmpeg export
Math
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Calculator
Calculator with Basic, Scientific (trig, log, factorial, constants), and Programmer (HEX/DEC/OCT/BIN, AND/OR/XOR/NOT/shifts) modes. Includes memory, history, and keyboard input
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Financial Calculator
Multi-tab financial calculator: NL salary (hourly/monthly/yearly net pay with 30% ruling, vakantiegeld, heffingskortingen, 2024 brackets), loan/mortgage with annuity/linear/interest-only types and tax-deduction (hypotheekrenteaftrek), compound interest, savings goal solver, ROI with CAGR, and retirement planner
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Graph Plotter
Plot mathematical functions with interactive pan, zoom, and trace. Supports multiple functions, numerical derivatives, and export to PNG
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Matrix
Matrix calculator with addition, subtraction, multiplication, scalar multiply, transpose, inverse, determinant, trace, rank, RREF (with row-operation steps), LU decomposition, QR decomposition, eigenvalues + eigenvectors, and Ax=b solver. Cell input accepts expressions like 1/3 or sqrt(2). Exports to LaTeX and CSV.
Network
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Cert Generator
Generate CA, intermediate, and server certificates with custom DNS and IP SANs for development and internal PKI
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CORS Checker
Check if a URL has CORS enabled and view its CORS headers
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CSP Builder
Build a Content-Security-Policy visually from presets (strict nonce, static site, SPA), analyze existing policies for XSS bypasses, unsafe-inline, missing object-src/base-uri/frame-ancestors with an AโF grade, generate script hashes and nonces, and export config for Nginx, Apache, Caddy, Express, Netlify, Vercel, and Cloudflare
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DNS Lookup
Look up DNS records (A, AAAA, MX, TXT, CNAME, NS) for any domain and perform reverse DNS lookups for IP addresses
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HTTP Client
Postman-style HTTP request client. Send GET / POST / PUT / PATCH / DELETE / HEAD / OPTIONS with custom headers, query params, body (JSON / form / urlencoded / raw / binary), and authentication (Basic, Bearer, API key). View response status, time, size, headers, and JSON-formatted body. Save requests in named collections (IndexedDB), import/export collections as JSON, and round-trip cURL commands.
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HTTP Status
Complete reference of HTTP status codes organized by category (1xx-5xx) with descriptions, search, and filtering
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IP Subnet
Calculate subnet details from IP address and CIDR notation
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MQTT Client
Browser-based MQTT client over WebSocket. Connect to any ws/wss MQTT broker, subscribe to topics with wildcards (+, #), publish messages with QoS levels and retain flag, view live messages with topic filtering.
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My IP
Display your public IP address as seen by external servers
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OAuth 2.0 Explorer
Explore, build, and test OAuth 2.0 authorization flows with step-by-step visualization and live request testing. Supports Authorization Code, PKCE, Implicit, Client Credentials, Device Code, and Password Grant flows with real URL generation, PKCE challenge computation, and callback handling โ all client-side in the browser.
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Port Reference
Reference for common network ports, protocols, and services
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Robots.txt
Generate robots.txt with presets (block AI training crawlers, WordPress, e-commerce), validate syntax and common mistakes, and test which URLs Googlebot, Bingbot, GPTBot, ClaudeBot, and 25+ other crawlers can access using RFC 9309 matching
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Server-Sent Events
Connect to any Server-Sent Events (SSE) endpoint, listen to default and custom event types, view payloads with auto JSON formatting, filter, and copy. Useful for testing streaming APIs and live feeds.
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SSL/TLS Checker
Check SSL/TLS certificates for any domain, view certificate details, expiry dates, certificate chain, and cipher suites
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WebRTC
Peer-to-peer communication tool for text chat, video calls, and file transfer using WebRTC. Connect devices via link sharing or manual paste, no server required.
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WebSocket
Connect to any ws:// or wss:// endpoint, send text or binary frames (hex / base64), see live frame log with direction, size, and timing. Includes auto-reconnect, ping/echo latency, subprotocol support, JSON pretty-print, log export, and saved connection presets.
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WHOIS Lookup
Look up domain registration information including registrar, creation date, expiry date, nameservers, and domain status
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X.509 Decoder
Decode PEM or DER X.509 certificates, certificate chains, CSRs (PKCS#10), and public keys. View subject, issuer, validity, SANs, key usage, extensions, SHA-1/SHA-256 fingerprints, SPKI pins, and verify chain signatures client-side
Party
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Camera
Record video and take photos from your camera with audio support
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Coin Flipper
Flip a virtual coin to make decisions with customizable appearance and statistics
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Dice Roller
Roll dice of various sizes with presets for D&D, board games, and more
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Hangman
Classic hangman word guessing game in English, Turkish, Dutch, German, French, Spanish, and Italian. Play with random words from categories (animals, food, countries, cities, tech and more) or enter a secret word with an optional hint for friends to guess. Keyboard support, fullscreen mode, and win/loss statistics.
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Meme Generator
Create memes with 130+ online viral templates (Drake, Distracted Boyfriend, Woman Yelling at Cat, Off Ramp, Always Has Been, Galaxy Brain, Skeptical Kid, Leo Strutting, and more), built-in placeholder canvases, image upload, or pasted image URLs. Add unlimited draggable text boxes with classic Impact white-on-black-outline styling, custom font, size, fill color, outline color and width, alignment, bold/italic/uppercase. Download as PNG or copy to clipboard. All processing runs in your browser.
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Name Picker
Spin a wheel to pick random names with prize support and winner history
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Team Splitter
Split a list of participants into balanced random teams. Supports fixed team count or fixed team size, weight-based balancing, keep-together / keep-apart constraints, lock-and-reshuffle, seed-based reproducibility, team-name generator, and export to text / CSV / JSON
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Tournament Bracket
Generate single-elimination and round-robin tournament brackets from a list of participants. Track scores, pick winners, view live standings with W/L/points for round-robin format.
Tester
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Battery Status
View battery level, charging state, time-to-full, and time-remaining via the Battery Status API. Includes session level history chart. Limited browser support.
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Bluetooth
Scan and connect to Bluetooth Low Energy (BLE) devices via Web Bluetooth. Discover GATT services and characteristics, read values, subscribe to notifications, and send custom commands to any writable characteristic as hex, text, base64, or decimal bytes. Includes a live activity log. Chrome/Edge/Android only.
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Clipboard
Inspect your clipboard contents including text, HTML, and images. View format details, character counts, byte sizes, and rendered HTML previews with read history
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Color Vision
Explore color vision with number plates, color matching, and hue ordering. Review redโgreen and blueโyellow task results and learn about color vision types. Educational, not diagnostic.
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Dead Pixel
Test your screen for dead pixels by displaying solid colors and patterns
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Geolocation & Sensors
Read geolocation (GPS lat/lon/altitude/heading/speed), device orientation (alpha/beta/gamma), motion (acceleration, gravity, rotation rate), and ambient light sensor. iOS permission flow supported.
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Hardware & Browser
Inspect browser-visible hardware including CPU architecture and logical cores, approximate RAM, GPU renderer, display, storage quota, connected devices, operating system, and supported web APIs
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Input Tester
Test keyboard and gamepad inputs with real-time event display
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Microphone
Test your microphone with live waveform visualization, volume meter, frequency spectrum analysis, and test clip recording. View device info including sample rate and channel count
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Mouse / Pointer
Test mouse buttons, scroll wheel, polling rate, click counts, double-click gap, and movement speed. Visualizes click positions and trail with a live event log
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Multi-Touch
Test multi-touch support on your device with visual feedback and touch point details
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Network Speed
Test your internet connection speed with download, upload, and latency measurements using Cloudflare endpoints. View history of past results
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Screen Resolution
View screen resolution, window size, pixel density, and display information
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Serial Terminal
Connect to Arduino, ESP32, microcontrollers, and serial adapters with Web Serial. Send and receive text or hex data, control line endings and signals, inspect timestamps, and export session logs
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Speaker
Test your speakers and headphones with tone generator, frequency sweep, white/pink noise, and left/right channel isolation. Supports sine, square, sawtooth, and triangle waveforms
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Typing Speed
Measure your typing speed (WPM) and accuracy with multiple modes including common words, mixed difficulty, and code snippets. Real-time stats, WPM chart, and configurable duration
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Vibration
Test the Vibration API with single pulses, presets (SOS, heartbeat, double-tap, alarm), and custom millisecond patterns. Mobile devices only.
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Webcam
Test your webcam: live preview, device list, resolution probing (QQVGA to 4K), active settings, capability inspection, and snapshot capture. Useful for verifying camera resolutions and constraints.
Text
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ANSI Colors
Generate ANSI escape codes for colored terminal output with live preview, supporting 16 colors, 256 colors, and true color RGB modes for bash, zsh, and other shells
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ASCII Art
Generate ASCII art text banners using FIGlet fonts, convert uploaded images into ASCII or Braille-dot art with custom character sets/detail controls, edit with text/grid tools, zoom previews, and paint ANSI-colored/styled output with multiple escape copy formats
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ASCII Table
Complete ASCII character reference table showing decimal, hexadecimal, octal, and binary codes for all 128 standard characters including control characters with escape sequences
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Code Screenshot
Create beautiful code screenshots with syntax highlighting, multiple themes (Monokai, Dracula, Nord, GitHub), gradient backgrounds, window chrome styles, and export to PNG or SVG
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Diff
Compare two texts or normalized JSON documents side-by-side and highlight differences line-by-line using LCS algorithm with inline and split view modes, color-coded additions and deletions
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DOCX Editor
Edit Microsoft Word (.docx) documents directly in the browser with a WYSIWYG editor, track changes mode, rulers, outline navigation, and DOCX download.
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DOCX Viewer
View Microsoft Word (.docx) documents directly in the browser with full formatting, headers, footers, and page breaks. Export to HTML or Markdown.
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Emoji
Browse, search, and copy emojis organized by category with one-click copying to clipboard, featuring thousands of Unicode emojis with skin tone variants
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Escape
Escape or unescape special characters for JSON, HTML, URL, Regex, Shell, SQL, and CSV formats with bidirectional conversion and instant results
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Font Glyphs
Upload and inspect font files (TTF, OTF, TTC, WOFF, WOFF2) with Unicode block filters, Private Use icon glyph support, preview text, adjustable glyph size, and copy formats for characters, U+ codes, HTML entities, and CSS escapes
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Lorem Ipsum
Generate lorem ipsum placeholder text with customizable word, sentence, or paragraph counts for mockups, wireframes, and design prototypes
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Markdown Preview
Live Comark markdown editor with GitHub Flavored Markdown, Mermaid diagrams, syntax-highlighted code blocks, and KaTeX math rendering
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NATO Alphabet
Convert text to NATO phonetic alphabet (Alpha, Bravo, Charlie) for clear verbal communication, useful for spelling over radio, phone, or in noisy environments
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Notepad
Markdown notes and local files organized in nested folders with live preview, drag-and-drop, and auto-save to your browser via IndexedDB. Import any file and export notes or folders
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Obfuscator
Obfuscate and mask sensitive text using multiple methods including asterisks, ROT13, leetspeak (1337), Unicode lookalikes, and character scrambling for privacy
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Regex
Test regular expressions with real-time matching, groups, and flags
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String Inspector
Reveal hidden Unicode characters: zero-width spaces, BOM, bidirectional overrides (Trojan Source), homoglyphs, non-breaking spaces, smart quotes, and control characters. Shows code points, UTF-8/UTF-16 bytes, grapheme/byte lengths, normalization, and cleans or escapes the text
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Subtitle Editor
Edit and convert subtitle files (SRT, WebVTT, ASS) with synced video preview, visual timeline, time sync, bulk time shift, split/merge, search & replace, overlap detection, and format conversion
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Transform
Transform text with powerful operations including sort lines, remove duplicates, reverse, case conversion (uppercase, lowercase, title, camel, snake, kebab, pascal case), and line manipulation