UD5 Toolkit
Tiny House Cost Estimator – Online DIY Build Budget Tool
Breakdown of expected costs (materials, appliances, etc.) for a tiny house. Adjust percentages or enter custom. Local calculation.
All Tools
999+ toolsnpm Version Range Checker - Online SemVer & Tilde Caret
Enter a package name and version range to see all satisfying versions from the registry. Understand ^ and ~.
ASCII Table - Online Character Code Reference
Interactive ASCII table showing decimal, hex, octal, and binary codes for all standard and extended ASCII characters. A classic programmer reference.
Random Song Lyric Generator - Online Fake Music Line Creator
Generate a random, somewhat meaningful song lyric line. Write your own hit with AI‑free randomness. All local.
Lenticular Print Generator - Online Interlace Two Photos
Interlace two images into a striped pattern for lenticular lens printing. Preview with simulated tilt. DIY fun.
Word Scrambler - Online Letter Jumble Game Generator
Scramble letters of any word or sentence to create anagrams. Great for brain teasers and vocabulary games. Simple, fun, and client-side.
Plant Watering Schedule - Online Reminder & Tracker
Add plants and track when you last watered them. Get a simple visual alert when it's time to water. Local storage.
Image Pixelator - Online Censor & Mosaic Effect Tool
Pixelate or censor parts of an image by dragging. Adjust block size for mosaic effect. Useful for hiding faces or sensitive data. Client-side processing.
PWA Install Prompt Checker - Online See beforeinstallprompt Status
Check if the browser has captured the beforeinstallprompt event. Understand why your PWA is (or isn't) installable.
Acronym Expander - Online Find What It Stands For
Enter an acronym and see its most common full forms. Static dictionary. No internet needed after load.
Semaphore Flag Translator - Online Signal Code Converter
Translate text into semaphore flag positions and decode semaphore back to letters. Interactive animated flags. For scouts and maritime fans.
Image Watermarker - Online Add Text or Logo to Photos
Protect your images by adding a text or image watermark. Adjust transparency, position, and rotation. All image processing is done locally; no upload to server.
Clipboard API Tester - Online Read & Write Sandbox
Experiment with the Async Clipboard API: read/write text and images from the clipboard. Verify permissions and see demo code.
Tangram Puzzle - Online Drag & Match Shapes
Drag the seven tangram pieces to form a target silhouette. Multiple puzzles. Develop spatial thinking. All canvas interactions.
Periodic Table Explorer - Online Element Facts & 3D Model
Browse a beautifully designed periodic table with electron shell visualization and key facts. Click any element to learn more. Offline ready.
Simple Haversine Distance Calculator – Online City‑to‑City
Enter two city names or coordinates and get the straight‑line distance in miles/km. Local calculation.
Browser Storage Quota Estimator - Online Check Limit
Estimate how many MB/GB your storage can hold based on navigator.storage.estimate() and display as a pie chart.
Font Fallback Checker - Online See Missing Glyphs
Type any character and see how it renders in different font stacks. Detect missing glyphs and fallback behavior.
ASL Fingerspelling Practice - Online Random Words Quiz
Shows a random short word and displays animated ASL fingerspelling letters. Type what you see. Improve receptive skills.
Scale of the Universe - Online Zoom from Planck to Galaxy
Zoom through sizes from the Planck length to the observable universe. Educational and awe‑inspiring visualization.
Caesar Cipher Encoder & Decoder - Online Shift Cipher Tool
Encrypt and decrypt messages using the classic Caesar cipher with configurable shift key. Fun for puzzles and basic cryptography lessons. Entirely browser-based.
Image Resizer - Online Bulk Photo Resize Without Upload
Resize images directly in your browser by width, height, or percentage. Maintain aspect ratio and download the result. Images never leave your computer.
Knot Strength Efficiency Guide – Online Visual Weakness Chart
Compare common knots by their efficiency percentage and residual strength. Interactive chart with animated diagrams.
Screen Recorder - Online Record Browser Tab & Download WebM
Record your screen, application window, or browser tab directly using the Screen Capture API. Download as WebM. All local.
Audio Converter - Online Convert WAV MP3 OGG Locally
Convert audio files between popular formats like WAV, MP3, and OGG directly in the browser. No upload, fast encoding using WebAudio and ffmpeg wasm.
Gratitude Journal - Online Daily Thankfulness Log
Write three things you’re grateful for each day. Saved locally. Export as text. Boost mental well-being.
Excuse Generator - Online Funny & Creative Reasons
One click to get a hilarious excuse for being late, missing homework, or not doing chores. Pure comedy.
Dynamic Placeholder Image Service - Online Test Images
Generate dynamic placeholder images by specifying width, height, colors, and text. View instantly as a URL you can embed in mockups. Canvas-based.
GraphQL Playground - Online Query & Schema Explorer
Execute GraphQL queries against any endpoint with variables and headers. Explore schema via introspection. All requests made directly from your browser.
Random Decision Maker - Online Yes or No & Wheel
Can’t decide? Use a coin flip, yes/no randomizer, or a customizable wheel. Multiple fun methods to break analysis paralysis. Pure browser fun.
Text to Anki CSV - Online Flashcard Converter
Format a list of Q&A pairs and export as a CSV ready for Anki import. Simple line‑based template. Local.
Dad Joke Generator - Online Random Cheesy Puns
Click for an endless stream of random dad jokes and puns. Copy and share. Guaranteed to make you groan. All local.
Sudoku Generator - Online Play & Create 9x9 Puzzles
Generate a random Sudoku puzzle with a unique solution. Choose difficulty and type numbers on the board. Timer and mistake counter.
Crossword Builder - Online Create & Solve Simple Puzzles
Build a small crossword by adding words and clues. Export as a printable grid or solve in browser. Perfect for classrooms.
Isogram Checker - Online Words Without Repeating Letters
Find out if a word is an isogram (no repeating letters). Different types: first-order, second-order. Word nerd fun.
Haiku Generator - Online Random 5-7-5 Poem Creator
Click to generate a random haiku from natural language templates. Pure algorithmic poetry fun. Copy and share.
Lyrics Finder - Online Song Lyrics Search Tool
Enter a song title and artist to find lyrics using public APIs. Quick preview and copy. A lightweight tool for music lovers.
PDF Merger - Online Combine Multiple PDFs into One
Combine multiple PDF files into a single document. Drag and drop to reorder pages. All merging is done locally for confidentiality.
Image Splitter - Online Cut Photo into Grid or Strips
Split an image into equal grid parts or horizontal/vertical strips. Useful for Instagram carousel posts or puzzle creation. Everything runs in your browser.
Image Cropper - Online Crop Photo Circle & Rectangle
Crop images into rectangular or circular shapes with interactive handles. Output as PNG or JPEG. A simple, browser-based tool with no uploads required.
Character Counter - Online Letter & Symbol Frequency Tool
Deep-dive into text with detailed character and letter frequency analysis. Supports multiple languages and includes whitespace control. Fast and private.
Circle Image Cropper - Online Round Photo
Crop any image into a perfect circle and save as PNG with transparent corners. For profile pictures. Local canvas.
Audio Pitch Shifter - Online Change Key Without Speed
Shift the pitch of any audio clip by semitones without affecting playback speed. Perfect for music transposition. Local Web Audio.
PDF Metadata Viewer - Online Read Author, Title & Keywords
Drop a PDF and see its embedded metadata: author, title, creation date, and more. No content is uploaded; pure browser PDF parsing.
Eye Dominance Test - Online Find Your Dominant Eye
Simple interactive eye dominance test: hold up a virtual dot and see which eye stays aligned. Educational.
FizzBuzz Interactive Tester - Online Coding Classic
Run the classic FizzBuzz with custom rules. See the output for any range. A beginner programmer's playground.
Exoplanet Name Generator - Online Alien World Catalog
Generate a realistic‑sounding exoplanet designation (e.g., Kepler‑442b) and a sci‑fi planet description. For worldbuilding.
Flame Test Colors - Online Element Identification Chart
Click a metal ion to see the characteristic flame color and wavelength. Useful for analytical chemistry reference.
Weather Emoji Interpreter - Online Translate Symbols to Text
Paste a string of weather emojis and get a written weather forecast. Fun and educational emoji tool.
Megapixel Calculator - Online Print Size & Resolution
Find out how large you can print based on image resolution in pixels. Understand DPI and megapixels.
F‑Stop Calculator - Online Aperture & Depth of Field Reference
Learn about f‑stops and their effect on light and depth. Calculate equivalent exposure adjustments. Educational.
CAGR Calculator - Online Compound Annual Growth Rate
Find the CAGR of an investment given start and end values over a time period. Instant growth rate.
Tone Analyzer - Online Detect Emotion in Text
Paste text and get a rough analysis of its emotional tone (happy, sad, angry, etc.) based on keyword matching. Local.
Function Graph Plotter - Online Math Visualizer 2D
Plot one or more mathematical functions f(x) on a 2D canvas. Zoom, pan, and see intersections. Great for calculus and algebra. Purely client‑side.
QR Code with Text - Online Add Label & Caption Below
Generate a QR code with a custom text label below or above. Perfect for printed signs. All generated locally as a single image.
Emoji Image Generator - Online Picture from Emojis Mosaic
Recreate an image using a mosaic of emojis. Replace pixel blocks with matching emojis. Fun, unique effect. All done locally.
Expense Tracker - Online Simple Budget & Spend Logger
Track personal expenses and categorize spending. Interactive charts show where your money goes. All financial data remains in your browser only.
Pressure Converter - Online Bar PSI Pascal Atmosphere Tool
Convert between common pressure units: Pascal, Bar, PSI, atmosphere, and Torr. Useful for engineering and weather enthusiasts. Local calculation.
SQL Formatter & Beautifier - Online SQL Query Cleaner
Format and beautify SQL queries for improved readability. Supports various SQL dialects. Quick syntax highlighting and local processing ensure a secure experience.
JSON Formatter & Validator - Online JSON Beautifier
Online JSON formatting and validation tool, supporting JSON minify/beautify, syntax highlighting, and error locating. Data processed locally in browser for security.