Free Online Tools for Developers, Designers & Everyone
From JSON formatters to SIP calculators — one free toolkit for everything.
Fast, private, and free web tools — from financial calculators to developer utilities. Everything runs in your browser. No sign-up, no bloat.
Essential Utilities
167 free tools for developers and creators.
WCAG Contrast Checker
Real-time WCAG 2.1 AA/AAA + APCA contrast checker. Paste any two colors and see the ratio, pass/fail badges for every threshold, a live preview at six text sizes in regular and bold, color-blindness simulation (protanopia, deuteranopia, tritanopia, achromatopsia), the nearest passing colors when you fail, and one-click export to CSS, SCSS, Tailwind, or design tokens. 100% in your browser.
Open Tool →Stripe Fee Calculator
Calculate Stripe fees for any transaction across 20 countries — cards, ACH, SEPA, Apple Pay, Klarna, Connect, Subscriptions, Refunds, and Disputes. Forward and reverse modes, side-by-side comparisons with PayPal, Square, Braintree, and others, bulk CSV calculation, and shareable permalinks. Itemized breakdown with the exact formula, sourced from Stripe's official pricing pages. 100% in your browser.
Open Tool →CI/CD Configuration Converter
Convert CI/CD pipelines between GitHub Actions, GitLab CI, CircleCI, and Bitbucket Pipelines. Parses workflows into a canonical IR and re-emits them with confidence-annotated audit, round-trip validation, and a Markdown audit report. 200+ component mappings (actions/checkout, setup-node, docker/build-push, AWS/GCP/Azure auth, CircleCI orbs, Bitbucket pipes). 100% in your browser.
Open Tool →AI Coding Rules
Curated rules-file library and generator for Cursor, Claude Code, GitHub Copilot, Windsurf, Cline, Aider, Continue, and Cody. Browse 20 hand-crafted .cursorrules / CLAUDE.md / copilot-instructions.md files for popular stacks, build a custom one with the wizard, or convert any rules file between AI-tool formats.
Open Tool →Is It Down?
Live status of npm, GitHub, OpenAI, AWS, Cloudflare, Stripe, Vercel, Discord, Slack, Anthropic, and 40+ more developer services. One page, refreshed every 30 seconds, with 90-day per-service incident history and dynamic OG link previews.
Open Tool →JSON Schema Generator
Generate a JSON Schema from one or more sample JSONs — drafts 2020-12, 2019-09, 7, 6, 4. Detects formats (date-time, email, uuid, ipv4, uri), extracts $defs, validates with AJV, and exports to YAML, TypeScript, and Zod. 100% in your browser.
Open Tool →Passport Photo Maker
Create print-ready passport, visa, and ID photos for 30+ countries — at exact mm sizes and 300 DPI, with crop guides, compliance checks, and print sheets. 100% in your browser.
Open Tool →Favicon Generator
Create favicons from images, text, or emoji. Outputs favicon.ico, apple-touch-icon, Android PWA icons, Web App Manifest, and HTML snippet — all in your browser. Free, no signup.
Open Tool →IP Calculator
Calculate subnet mask, network address, broadcast, wildcard mask, usable hosts, and binary representation for any IPv4 or IPv6 CIDR. Includes VLSM, subnet splitter, and range-to-CIDR converter.
Open Tool →YouTube Thumbnail Downloader
Download YouTube video thumbnails in HD and multiple resolutions instantly.
Open Tool →Morse Code Translator
Convert text to Morse code and back — with audio playback, WAV download, and image export.
Open Tool →Word Counter
Real-time character, word, and paragraph analysis.
Open Tool →EXIF Viewer
View and remove EXIF metadata, GPS location, camera settings, and privacy data from photos — free, private, runs in your browser.
Open Tool →Image Compressor
Reduce file size without losing visual fidelity.
Open Tool →Image Resizer
Resize images to exact dimensions, percentage, or target file size — 40+ social media presets, bulk mode.
Open Tool →JSON Formatter
Clean, minify, and validate JSON data structures.
Open Tool →JSON Validator
Validate JSON syntax and get precise error messages with line numbers. Check if JSON is well-formed instantly.
Open Tool →PDF Tools
Merge multiple PDFs or extract pages — all in your browser.
Open Tool →QR Generator
QR codes for URLs, WiFi, vCards, and text. PNG & SVG download.
Open Tool →Color Palette
Extract colors from images or generate harmonious palettes.
Open Tool →Unit Converter
Precise conversion for metric and imperial units.
Open Tool →Lorem Ipsum
Generate placeholder text for design layouts.
Open Tool →Password Gen
Highly secure, random entropy generation.
Open Tool →Base64
Encode and decode Base64 strings instantly.
Open Tool →Regex Tester
Real-time expression matching and testing.
Open Tool →Markdown Editor
Live preview markdown rendering engine.
Open Tool →SVG Converter
Convert SVG to PNG at any resolution or ICO for favicons.
Open Tool →Case Converter
UPPER, lower, Title, camelCase, snake_case, kebab-case.
Open Tool →HTML Entity
Encode special chars to HTML entities and decode back.
Open Tool →Unix Timestamp
Unix timestamps to human dates, multiple timezones.
Open Tool →CSS Gradient
Visual CSS background generator & code.
Open Tool →Readability
Flesch-Kincaid score and text analysis.
Open Tool →Diff Checker
Compare two files for visual differences.
Open Tool →Cron Builder
Visual builder for cron-job schedules.
Open Tool →EMI Calculator
Calculate loan EMI, total interest, and amortization schedule instantly.
Open Tool →Mortgage Calculator
Calculate mortgage EMI, total interest, and full repayment schedule.
Open Tool →Mortgage Affordability Calculator
Find out how much house you can afford based on income, debts, down payment, and interest rate.
Open Tool →Car Loan EMI Calculator
Calculate auto loan EMI, total interest, and amortization schedule.
Open Tool →Personal Loan EMI Calculator
Calculate personal loan EMI, interest, and repayment breakdown.
Open Tool →Education Loan EMI Calculator
Calculate student loan EMI, total interest, and repayment schedule.
Open Tool →Image to Text
Extract text from any image using free browser-side OCR.
Open Tool →Percentage Calculator
Calculate percentages, find what percent one number is of another, and more.
Open Tool →Age Calculator
Calculate your exact age in years, months, days, hours — and more.
Open Tool →Calorie Calculator
Calculate daily calorie needs, BMR, TDEE, calorie deficit, and macros.
Open Tool →Aspect Ratio Calculator
Find, simplify, and convert aspect ratios for images, video, and social media.
Open Tool →HEIC to JPG Converter
Convert HEIC photos from iPhone to JPG or PNG — free, instant, runs in your browser.
Open Tool →BMI Calculator
Calculate your Body Mass Index with ideal weight range and health category.
Open Tool →Body Fat Calculator
Calculate body fat percentage using the US Navy formula or BMI method. Includes ideal body fat range and fat loss calculator.
Open Tool →One Rep Max Calculator
Estimate your 1RM using 7 formulas (Epley, Brzycki, and more). Get training percentages, plate loads, and strength standards.
Open Tool →Retirement & FIRE Calculator
Monte Carlo retirement planning with 5,000 simulations. See your probability of success, fan chart, and year-by-year breakdown — 4% Rule or VPW, Social Security, Roth, pre-tax.
Open Tool →Coast FIRE Calculator
Find your Coast FIRE number — the portfolio size that grows to your retirement goal with no further contributions. Monte Carlo simulation, browser-only.
Open Tool →Lean FIRE Calculator
Plan early retirement on a lean $25K–$40K/year budget. Monte Carlo success probability with frugal spending assumptions and long-horizon simulation.
Open Tool →Fat FIRE Calculator
Model early retirement with $100K+ annual spending. Fan chart, success rate, and year-by-year table with federal tax modeling for high-income FIRE.
Open Tool →Rent vs Buy Calculator
Monte Carlo rent vs buy analysis with 5,000 scenarios, full US tax modeling (SALT cap, standard vs itemized, capital gains exclusion), and opportunity cost of the down payment. Free, no paywall.
Open Tool →Dividend Calculator
Calculate dividend yield, project DRIP reinvestment growth over 40 years, and build a monthly income portfolio. Handles SCHD, VOO, MSTY, JEPQ, QQQI and 100+ dividend stocks & ETFs including YieldMax covered-call products.
Open Tool →Compound Interest Calculator
Calculate how your savings grow with daily, monthly, or annual compounding. Includes growth chart, year-by-year schedule, and simple vs compound interest comparison.
Open Tool →Typing Speed Test
Free WPM typing test with 15s, 30s, 1min, 2min, and 5min durations. Easy, Medium, and Hard modes. Personal best tracking and session history.
Open Tool →Random Number Generator
Generate random numbers in any range. Includes dice roller, coin flip, random name picker, and yes/no generator.
Open Tool →Random Letter Generator
Pick a random letter A–Z, vowels, or consonants. Configurable count, case, repeats, weighted by English frequency, multi-language alphabets. Single, list, or spinning wheel mode.
Open Tool →Online Timer
Countdown timer with presets from 30 seconds to 2 hours. Includes Pomodoro timer, stopwatch, and multiple simultaneous timers.
Open Tool →JWT Decoder
Decode and inspect JWT tokens — header, payload, timestamps.
Open Tool →Multi-Tenant JWT Debugger
Inspect B2B SaaS JWTs — tenant context, scoped permissions, provider conventions (Clerk, WorkOS, Auth0, Supabase, Stack Auth, Firebase, Cognito), comparison, and a test-token generator.
Open Tool →SIP Calculator
Calculate future value of your monthly SIP investments with compound returns. Includes year-wise growth chart, step-up SIP, and goal-based reverse calculator.
Open Tool →UUID Generator
Generate random UUID v4 identifiers. Bulk generate up to 100 UUIDs, toggle uppercase/lowercase and hyphen formatting.
Open Tool →Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text or files. Supports HMAC authentication codes.
Open Tool →URL Encoder/Decoder
Encode and decode URLs using percent-encoding. Supports full URI, component, and legacy encoding modes.
Open Tool →JSON ↔ CSV Converter
Convert JSON arrays to CSV and CSV back to JSON. Custom delimiter, header row control, and one-click download.
Open Tool →XML Formatter
Format, minify, and validate XML. Convert XML to JSON with one click. Supports custom indent sizes.
Open Tool →YAML Formatter
Format and validate YAML. Convert YAML to JSON or JSON to YAML. Supports 2 and 4 space indentation.
Open Tool →Salary Calculator
Convert hourly wage to yearly salary or annual to hourly. Includes overtime and tax estimates.
Open Tool →Paycheck Calculator
Calculate your take-home pay after federal, state & local taxes, 401k, and deductions. Supports US (all 50 states), UK, Canada, Australia, and India.
Open Tool →GPA Calculator
Calculate semester and cumulative GPA across 4.0, 5.0, and international grading scales.
Open Tool →Final Grade Calculator
Find out what score you need on your final exam to reach your target course grade.
Open Tool →Grade Calculator
Calculate your current course grade from weighted assignments or total points earned.
Open Tool →GPA Scale Converter
Convert between percentage, letter grades, 4.0, 4.3, 5.0, and international GPA scales.
Open Tool →Weighted Grade Calculator
Track your full syllabus across a semester. Weighted categories with assignments, drop-lowest, extra credit, what-if scenarios, target-grade reverse calculation, snapshots, and save-state — all in your browser.
Open Tool →PDF to Word
Convert PDF files to editable Word documents (DOCX) — free, instant, runs in your browser.
Open Tool →PDF to JPG
Convert PDF pages to high-quality JPG images — free, no upload, runs entirely in your browser.
Open Tool →JPG to PDF
Convert JPG images to a PDF document — combine multiple photos into one file in your browser.
Open Tool →PNG to PDF
Convert PNG images to a PDF document — combine multiple PNGs into one file in your browser.
Open Tool →Image to PDF
Convert JPG, PNG, WebP, and other images to PDF — batch convert and combine in your browser.
Open Tool →HEIC to PDF
Convert iPhone HEIC photos to PDF — combine into one multi-page document or batch as individual PDFs, runs in your browser.
Open Tool →Instagram Story Templates
Free customizable story templates for Instagram. Edit text, colors, and fonts — download in 1080×1920 PNG instantly.
Open Tool →Audio Converter
Convert MP3, WAV, M4A, OGG, FLAC, and AAC audio files to any format — free, instant, runs entirely in your browser.
Open Tool →Audio Compressor
Reduce audio file size without sacrificing quality. Choose from presets or set a custom bitrate — all in your browser.
Open Tool →Audio Trimmer
Cut and trim audio files with a visual waveform editor. Set start/end points, add fades, and preview before downloading.
Open Tool →Audio Joiner
Free online audio joiner. Combine MP3, WAV, M4A, OGG and FLAC files into one — reorder tracks, add gaps, crossfade, adjust volume. No upload.
Open Tool →SQL Formatter
Format, beautify, and minify SQL queries online. Supports MySQL, PostgreSQL, SQLite, and more SQL dialects.
Open Tool →Invoice Generator
Create professional invoices with logo, tax calculations, and PDF download — free, no signup.
Open Tool →Screen Recorder
Record your screen, webcam, or both directly in your browser. No download or signup required.
Open Tool →Barcode Generator
Generate Code 128, EAN-13, UPC-A, and 6 other barcode formats. Download as PNG or SVG — free, no signup.
Open Tool →Logo Maker
Design logos with a drag-and-drop canvas editor. Add text, icons, and shapes — export PNG, SVG, or ZIP.
Open Tool →Watermark Remover
Remove watermarks, logos, and text overlays from images using intelligent content-aware fill. Free, private, no uploads.
Open Tool →Email Signature Generator
Create professional HTML email signatures with logo, social links, and custom branding. Works with Gmail, Outlook, and Apple Mail.
Open Tool →SEO Audit
Audit any URL's on-page SEO — meta tags, headings, images, links, schema, Open Graph, and Twitter Cards in seconds.
Open Tool →Cheatsheet Hub
Interactive cheatsheets for Git, CSS, Linux, React, Vim, and more. Search, filter, and copy commands instantly.
Open Tool →Git Cheatsheet
Essential Git commands — setup, branching, merging, remotes, undoing changes, and more. Search and copy instantly.
Open Tool →CSS Cheatsheet
Quick reference for CSS selectors, Flexbox, Grid, typography, animations, and modern CSS. Search and copy instantly.
Open Tool →Linux Commands Cheatsheet
Essential Linux and Bash commands for navigation, files, processes, networking, and scripting. Search and copy instantly.
Open Tool →React Cheatsheet
React hooks, component patterns, performance optimizations, and React 19 features. Search and copy instantly.
Open Tool →Vim Cheatsheet
Vim modes, navigation, editing, search & replace, macros, and essential config. Search and copy instantly.
Open Tool →Gitignore Generator
Generate .gitignore files for any language, framework, or IDE — 100+ templates, 100% client-side.
Open Tool →LLM Cost Calculator
Compare token counts and API costs across GPT-5, Claude Opus 4.7, Gemini 3, and more — all in your browser.
Open Tool →Vector Database Cost Calculator
Compare monthly cost across Pinecone, Weaviate, Qdrant, Milvus, Chroma, MongoDB Atlas, and self-hosted pgvector. Quantization, replication, and DevOps overhead all baked in.
Open Tool →RAG Cost Calculator
End-to-end RAG pipeline cost — Embedding · Storage · Retrieval · Generation. Compare 17 embedding models × 10 vector DBs × 20+ LLMs in one view, with the math shown for every layer.
Open Tool →GPU VRAM Calculator for LLMs
Estimate GPU VRAM for running or fine-tuning open LLMs — Llama, Mistral, Qwen, DeepSeek, Gemma, Phi. Inference, LoRA, QLoRA, full FT, every quantization level, with the math shown.
Open Tool →Resume Builder
Build an ATS-friendly one-page resume with live preview and PDF export — free, no signup, no data upload.
Open Tool →Attendance Tracker
Generate a ready-to-use Excel attendance sheet with formulas, dropdowns, and a summary — enter your roster and date range, download in seconds.
Open Tool →Name Picker
Spin a wheel to pick a random name. Save rosters, share wheels via URL, run raffles and classroom draws — no account needed.
Open Tool →Pictionary Word Generator
Random Pictionary words with easy/medium/hard difficulty, 10+ categories, hide-word presenter mode, built-in timer, and team scores. No signup.
Open Tool →Cursive Generator
Convert text to cursive, script, italic, fraktur, and 6 more Unicode styles. Copy and paste anywhere — Instagram, TikTok, Discord, X, WhatsApp, Google Docs. 10 styles, per-platform compatibility badges, share-link, favorites. 100% in your browser.
Open Tool →Italics Generator
Convert text to italic Unicode — 5 italic variants (Italic, Bold Italic, Sans Italic, Sans Bold Italic, Script). Copy and paste anywhere — Instagram, TikTok, Discord, X, LinkedIn. Per-platform compatibility matrix, accessibility-aware screen-reader disclosure, share-link, favorites. Runs entirely in your browser.
Open Tool →Random Animal Generator
Pick a random animal from a curated database of 500+ species. Filter by class (mammals, birds, reptiles, amphibians, fish, invertebrates), habitat, region, diet, size, and conservation status. Four modes — Single, Batch up to 50, guess-the-animal Game with progressive hints, and Writing Prompt with six tones. Save up to 100 favorites, export to JSON/CSV/text, share via URL, safe-for-kids by default. 100% in your browser.
Open Tool →Random Object Generator
Pick a random everyday object from a curated catalog of 400+ items. Five modes — Single, Batch up to 32, Pictionary with timer and reveal, Drawing Prompt that combines object + style + constraint with a 31-Day Drawing Challenge, and printable Scavenger Hunt with checkboxes. Filter by category, size, CEFR level, drawability, location, and scavenger or charades friendliness. Save favorites, share via URL, runs entirely in your browser.
Open Tool →Vim Adventure
Learn Vim by playing. Free browser-based game with 25 levels teaching hjkl, word motions, search, deletion, and more. No signup, no paywall, progress saved locally. Best free Vim Adventures alternative.
Open Tool →Magic 8 Ball
Ask the Magic 8 Ball online — free yes/no answers, fortunes, and decisions in seconds. All 20 classic answers, multiple modes, no signup.
Open Tool →Calendar Heatmap Generator
Turn any dated data into a GitHub-style contribution heatmap. Paste CSV, customize colors, and export as PNG or SVG — free, no signup.
Open Tool →SQL to ORM Converter
Convert CREATE TABLE SQL to Prisma, Drizzle, SQLAlchemy, Django, TypeORM, Sequelize, GORM, and Ecto model definitions — free, browser-based, no account needed.
Open Tool →Math Problem Steps
Solve equations, derivatives, and integrals with full step-by-step explanations — algebra through calculus, free, no paywall, runs in your browser.
Open Tool →Lesson Plan Template Generator
Download 20 free lesson plan templates as Word or PDF — daily, weekly, 5E, preschool, and more. Or fill in your plan and generate a formatted document in seconds.
Open Tool →Mermaid Live Editor
Create flowcharts, sequence diagrams, ER diagrams, class diagrams, state machines, Gantt charts, and more with live preview. Export as SVG or PNG.
Open Tool →Seating Chart Generator
Create classroom seating charts with constraint-aware randomization. Keep students apart, seat IEP kids near the front — print-ready in seconds.
Open Tool →Credit Card Test Number Generator
Generate Luhn-valid test card numbers and browse provider-specific sandbox test cards for Stripe, PayPal, Adyen, Braintree, Square, and more.
Open Tool →Pregnancy Due Date Calculator
Find your estimated due date from LMP, conception, ultrasound, or IVF transfer date. See your current week, trimester, and key milestones — free, private, runs in your browser.
Open Tool →White Screen
Pure white fullscreen display for monitor cleaning, brightness testing, webcam fill light, and use as a portable lightbox.
Open Tool →Black Screen
Pure black fullscreen for OLED backlight testing, burn-in prevention, dark backdrop for photography, and reducing eye strain.
Open Tool →Red Screen
Pure red (#FF0000) fullscreen for red subpixel testing, color channel isolation, night-vision preservation, and photography lighting.
Open Tool →Green Screen
Chroma key green fullscreen for virtual backgrounds, video production, and green subpixel color accuracy testing.
Open Tool →Blue Screen
Pure blue (#0000FF) fullscreen for blue subpixel testing, display color calibration, and photography backdrop.
Open Tool →Dead Pixel Test
Cycle through 8 solid colors to find stuck or dead pixels on any monitor, TV, or phone screen.
Open Tool →Monitor Test
All-in-one display diagnostic: dead pixels, color accuracy, gradients, sharpness, backlight uniformity, and geometry.
Open Tool →Screen Cleaner
Disable touch input and cycle white, black, and gray backgrounds to safely wipe dust and smudges off your display.
Open Tool →Digital Lightbox
Turn your monitor into a bright tracing light panel with adjustable brightness and color temperature for artists and photographers.
Open Tool →Webcam Light
Use your monitor as a soft fill light for Zoom, Teams, and Google Meet with adjustable brightness and color temperature.
Open Tool →Backlight Bleed Test
Check your LCD or OLED monitor for backlight bleeding and IPS glow using a pure black fullscreen display.
Open Tool →Color Gradient Test
Test your monitor for color banding and 8-bit vs 10-bit depth with smooth gradients across grayscale, red, green, blue, and hue channels.
Open Tool →Refresh Rate Test
Measure your display's actual refresh rate with requestAnimationFrame, test motion smoothness, and compare 60/120/144/240 Hz visually.
Open Tool →Resolution Test
Detect your browser's effective resolution and DPR, test 1px grid sharpness, and check geometric accuracy with concentric circles.
Open Tool →Focus Mode
Distraction-free fullscreen with a Pomodoro timer, synthesized ambient sounds, and customizable solid-color background for deep work.
Open Tool →PNG to ICO Converter
Convert PNG images to ICO favicon files. Choose which sizes to bundle (16, 32, 48, 64, 128, 256 px). Free, private, runs entirely in your browser.
Open Tool →ICO to PNG Converter
Extract all embedded images from an ICO favicon file and download them as PNG. Batch support, ZIP output. Free and private — no upload.
Open Tool →PNG to WebP Converter
Convert PNG images to WebP format for smaller file sizes — typically 25–35% smaller. Quality slider, lossless mode, batch conversion. No upload required.
Open Tool →WebP to PNG Converter
Convert WebP images back to PNG format for universal compatibility. Lossless output, batch support, ZIP download. Free, private, browser-based.
Open Tool →WebP to JPG Converter
Convert WebP images to JPG/JPEG. Set background color for transparent WebP, adjust quality, batch convert up to 20 files. No upload, fully private.
Open Tool →JPG to WebP Converter
Convert JPG/JPEG images to WebP for 25–35% smaller file sizes. Adjustable quality, lossless mode, batch conversion with ZIP output. Browser-only, zero upload.
Open Tool →AVIF to PNG Converter
Convert AVIF images to PNG for maximum compatibility. Lossless PNG output from AVIF sources. Batch support and ZIP download. Free and private.
Open Tool →AVIF to JPG Converter
Convert AVIF images to JPG/JPEG with quality control and background fill for transparent AVIF. Batch support. Runs 100% in your browser.
Open Tool →PNG to AVIF Converter
Convert PNG images to AVIF — the most efficient image format available, up to 50% smaller than JPEG at the same quality. Quality slider, batch mode, no upload.
Open Tool →BMP to PNG Converter
Convert BMP bitmap images to PNG with lossless compression — reduces file size by 60–80%. Batch support, ZIP download. Free, private, no upload.
Open Tool →TIFF to JPG Converter
Convert TIFF/TIF images to JPG. Supports multi-page TIFFs — each page exported as a separate JPG in a ZIP. Quality control, background fill. Free, browser-based.
Open Tool →TIFF to PNG Converter
Convert TIFF/TIF images to PNG with lossless output. Multi-page TIFF support exports each page as a PNG in a ZIP. Free, private, no upload required.
Open Tool →DOCX to PDF Converter
Convert Word DOCX files to PDF in your browser. Preserves headings, bold, lists, and images. No upload, no account, no size limits. Free and private.
Open Tool →DOCX to TXT Converter
Extract plain text from Word DOCX files. Strips all formatting and returns clean UTF-8 text. Batch support, configurable line breaks. Free, browser-based.
Open Tool →DOCX to HTML Converter
Convert Word DOCX documents to clean HTML. Preserves headings, paragraphs, bold, lists, and images as base64. Outputs full page or fragment. Free, no upload.
Open Tool →EPUB to PDF Converter
Convert EPUB ebooks to PDF for printing or fixed-layout reading. Chapter page breaks, cover image, table of contents. Free, browser-based, no upload.
Open Tool →MOBI to EPUB Converter
Convert Kindle MOBI ebooks to EPUB format for use on non-Kindle e-readers. Extracts text, images, and metadata. DRM-protected files are not supported.
Open Tool →EPUB to MOBI Converter
Convert EPUB ebooks to MOBI format for older Kindle devices. Preserves chapter structure and metadata. Free, browser-based. Note: modern Kindles prefer AZW3/EPUB.
Open Tool →XLS to CSV Converter
Convert Excel XLS or XLSX files to CSV. Multi-sheet workbooks: convert first sheet or all sheets as separate CSVs in a ZIP. Custom delimiters. Free, no upload.
Open Tool →CSV to XLSX Converter
Convert CSV files to Excel XLSX format. Auto-detect delimiters, infer column types, add header formatting. Batch support. Free, browser-based, no upload.
Open Tool →CSV to XML Converter
Convert CSV files to XML with configurable element names, attribute mode, pretty-print, and XML declaration. Ideal for data integration and API workflows. Free, no upload.
Open Tool →XML to CSV Converter
Flatten XML data into CSV rows. Auto-detect row elements, handle nested fields with dot notation. Preview detected structure before conversion. Free, browser-based.
Open Tool →Gravel Calculator
Estimate gravel by the cubic yard, ton, or truckload — for driveways, walkways, French drains, and landscaping. Real density ranges, compaction and waste built in, multi-region projects, layered driveway builds, and total cost. Imperial or metric, 100% in your browser.
Open Tool →Swim Time Converter
Convert competitive swim times between Short Course Yards (25y), Short Course Meters (25m), and Long Course Meters (50m) with stroke- and distance-specific factors. Four conversion models compared side-by-side (Classical, USA Swimming, NCAA, Performance), USA Swimming and NCAA time-standard cuts, roster mode for coaches with up to 200 swims, factor transparency, share via permalink, no signup, your data stays in your browser.
Open Tool →City Name Generator
Generate fantasy, real-world, sci-fi, and post-apocalyptic city names from a curated fragment catalog. Eight language flavors for fantasy (Norse, Slavic, Latinate, Anglo-Saxon, Celtic, Arabic-inspired, East Asian–inspired, generic invented), four sci-fi sub-styles, four post-apoc sub-styles, seven real-world traditions with a real-cities deny-list. Climate / era / tone / size metadata per name, optional pronunciation hints, worldbuilding pack mode for coherent regional sets of 2–20 names, save up to 100 favorites, share via URL, runs entirely in your browser.
Open Tool →Black & White Image Converter
Convert color photos to black and white using nine professional algorithms — Luminosity BT.709, Luminance BT.601, Average, Lightness HSL, Desaturation HSL, single-channel R/G/B for color-filter simulation, custom channel mixer with six filter presets, threshold with six dithering modes (Floyd-Steinberg, Atkinson, Bayer, Jarvis, Stucki), and adaptive threshold for documents. Adjustments, sepia / selenium / cyanotype / platinum / gold toning, 11 built-in presets, batch ZIP export, PNG/JPEG/WebP/PDF output, shareable recipe permalinks. 100% in your browser.
Open Tool →Travel Itinerary Template
Plan any trip day-by-day in your browser. Six starter templates (Weekend Getaway, 7-Day Europe, Business Trip, Honeymoon, Family Vacation, Backpacking), multi-currency cost tracking with snapshot FX rates and per-pair overrides, packing checklist seeded by trip type, client-side document vault for passport / visa / insurance / emergency contacts, undo/redo, autosave, and exports to PDF, Markdown, plain text, ICS calendar (RFC 5545), and shareable read-only links via URL hash. No signup, no upload, your data stays in your browser.
Open Tool →Planning Poker
Free real-time planning poker for Scrum and agile teams. Start a session, share a link, and estimate story points together — live, peer-to-peer, with no signup and no accounts. Fibonacci, Modified Fibonacci, T-shirt, Powers of 2, Linear, Risk, and custom decks; simultaneous reveal with average, median, mode, spread, consensus and outlier detection; a story queue with Markdown export; facilitator controls (reveal, reset, next/skip, kick, deck switching); reconnection with automatic host migration; and a Solo mode for individual backlog prep. Votes never touch a server — sync runs over WebRTC and a session vanishes when the last tab closes.
Open Tool →Built for speed. Free for everyone.
0ms
Latency
Runs entirely in your browser
100%
Client-Side
Zero server processing
167
Tools
And growing every week
Enterprise-grade Security
Every tool processes data locally in your browser. Your JSON, images, and documents never leave your machine — guaranteeing confidentiality for sensitive professional work.
- check_circleNo server uploads
- check_circleNo accounts required