UD5 Toolkit
Audio Duration Viewer - Online Get Length Without Player
Drop an audio file and instantly see its duration in seconds and formatted time. Read metadata without full playback.
General Utilities - Everyday Helpers
68+ toolsLive Sound Frequency Detector - Online Audio Analyzer
Use your microphone to detect the dominant frequency of ambient sounds. Visualize the spectrum. Local Web Audio.
Audio/Video Sync Tester - Online Lip Sync Check
Load a video and visually check if audio aligns with lips. Use frame‑by‑frame stepping. Debug playback issues.
Video Speed Controller - Online Slow Motion & Timelapse
Play any video at a custom rate (0.25x to 4x) without audio pitch change. Save the playback speed as a link. Local.
Image Format MIME Checker - Online Identify True Type
Drop an image that might have wrong extension and see its real format (JPEG, PNG, WebP) based on header bytes.
Instant Image Slideshow - Online Local Photo Player
Select a folder of images and start a full‑screen slideshow right in your browser. Adjust interval and transition. No upload.
Media Device Tester - Online Check Camera, Mic & Speaker
Quickly test if your webcam, microphone, and speakers work correctly. See live video and audio meter. No data sent.
Click Counter - Online Tally & Increment Tool
A large, simple button to count anything. Plus / minus, reset, and save count to localStorage. Works offline.
Microphone Sensitivity Tester - Online Input Level Meter
See a live VU meter of your microphone's input level. Test if your mic is working and adjust gain. Privacy‑friendly.
Text File Merger - Online Combine Multiple TXT
Upload multiple text files and concatenate them into one, with optional separators. No upload; processed instantly.
Keyboard Layout Tester - Online Visual Key Press Viewer
Press any key and see it light up on a standard QWERTY layout. Check functionality or demonstrate shortcuts.
Speaker Test Tones - Online Left/Right Channel & Sweep
Play left‑only, right‑only, and frequency sweeps to test your speakers or headphones. Quick audio check.
Geolocation to Address - Online Reverse Geocode
Enter latitude and longitude and get a human‑readable address using the browser's built‑in reverse geocoding (if available).
Battery Status API Viewer - Online Check Level
See your device's battery level, charging status, and discharge time using the Battery Status API. Fun utility.
Screen Wake Lock Tester - Online Keep Screen On
Toggle a screen wake lock to prevent the device from dimming or sleeping. See the lock state and learn the API.
Virtual Flashlight - Online Color & Strobe Screen
Turn your browser screen into a full‑color flashlight or strobe. Adjust brightness and color. Simple utility.
Clipboard History Viewer - Online See Last Copies
A small widget that records your clipboard text history (only while open). Search and re‑copy old snippets. No log upload.
Virtual Corkboard - Online Sticky Notes & Memos
Create colorful digital sticky notes on a corkboard. Drag, edit, and delete. Notes persist in local storage. No login.
Battery Saver Dark Screen - Online Minimal Power Page
A completely black page to save battery on OLED devices. Click to go fullscreen. Simple utility.
Digital Binary Clock - Online Time in Bits Fullscreen
A beautiful full‑screen binary clock showing hours, minutes, seconds in glowing bits. Dark mode perfect for desks.
Web Server Log Parser - Online Apache/Nginx Analyzer
Paste a raw server log snippet and see a structured table with IP, method, URL, and status. Quick audit.
Custom Reminder Pad - Online Simple Alarm Notes
Write a short note and set a specific time for a browser notification reminder. Great for quick one‑offs. Local.
File Name Sanitizer - Online Remove Invalid Characters
Paste a string and get a clean, safe file name by replacing forbidden characters. Works for Windows, Mac, Linux.
Hex Viewer - Online Inspect Binary File Hex Dump
Drop any file to see its raw hexadecimal representation and ASCII side‑by‑side. Navigate with offset. Client‑side only.
CSS Custom Properties Collector - Online List All :root Vars
Paste your CSS and get a sorted list of all custom properties defined under :root with their values. Quick audit.
Browser Speed Test - Online Measure Download/Upload
Measure your internet connection speed by downloading and uploading a small test file. Works from your browser.
Drag & Drop Order Tool - Online List Ranker
Reorder a list of items by dragging them. Paste a list, sort it by hand, and copy the new order. Simple.
Video Speed Controller - Online Slow Motion & Timelapse
Play any video at 0.25x to 4x speed. Save the modified speed as a new file. Perfect for analysis or fun.
Image Strip Joiner - Online Combine Side by Side
Glue multiple images together horizontally or vertically into one long strip. Perfect for sharing comparisons. Local.
Webcam Recorder - Online Capture Video & Save
Use your webcam to record a video clip and download it as WebM. Adjust resolution. Works offline. Privacy‑friendly.
GIF Frame Extractor - Online Split Animated GIF into PNGs
Upload an animated GIF and download every single frame as a separate PNG image. See frame delays and total count. Entirely local.
Screen Color Picker - Online Eyedropper with Magnifier
Use the browser's native eyedropper tool to pick any color from the screen. Shows zoomed preview. Quick and easy.
JavaScript Object Diff Viewer - Online Compare Data
Paste two JSON objects and see a highlighted diff showing what was added, removed, or changed. For API testing.
User Idle Time Display - Online See Seconds Since Activity
Shows a counter of how many seconds you have been idle. Tracks mouse and keyboard activity without recording.
Bulk Text Line Sorter - Online A‑Z & Z‑A
Sort hundreds of lines alphabetically, reverse alphabetically, or by length. Deduplicate option. All local.
File to Base64 Encoder/Decoder - Online Download
Encode any file into a Base64 string that you can copy, or decode a Base64 string back to a downloadable file. Pure frontend.
Reverse List Order - Online Flip Text Lines
Take a list of items and reverse the line order. The first becomes last. Simple and quick.
CSS Custom Property Extractor - Online List & Copy Root Vars
Paste your stylesheet and get a clean list of all custom properties defined under :root. Copy the whole block. Local analysis.
Auto Dark Mode Scheduler – Online Custom Time Switch
Set times to automatically switch light/dark theme on any website using a bookmarklet or live demo.
Emoji Extractor from Text - Online Pull Out Only Emojis
Paste a mixed text and get a list of only the emojis found within. Counts each unique emoji. Data cleanliness tool.
Visual Image Diff Slider - Online Compare Two Photos
Drag a slider over two images to see the differences instantly. Perfect for showcasing retouches or compression effects.
Random Card Picker - Online Deck Draw & Shuffle
Click to draw random playing cards from a shuffled deck. The full deck is displayed. Use for decision or magic tricks.
AES Text Encrypt/Decrypt - Online Secure Message Tool
Encrypt and decrypt text using AES in the browser with a password. Uses Web Crypto API. No data sent to server.
Live Binary Clock - Online Hex & Decimal Time
See the current time displayed in binary and hexadecimal. Dark theme, full‑screen mode. A geeky desk decoration.
Speaker Frequency Sweep - Online Audio Test & Ear Check
Play a sweep from 20Hz to 20kHz. Test your speakers and your hearing. Simple and effective. Web Audio API.
File Type from Magic Bytes Detector - Online Identify Unknown Files
Drop a file and see its detected type based on the first bytes (magic number). Identifies hundreds of formats. Local.
Online Audio Recorder - Record Voice & Export WAV
Record audio from your microphone and export as a WAV file. Monitor levels. Processed entirely in your browser.
Keyboard Shortcut Visualizer - Online See macOS/Win Modifier Keys
Press any key combination and see the human‑readable shortcut for macOS and Windows. Developer docs helper.
Wake Lock API Tester - Online Prevent Screen Sleep
Request and release a screen wake lock to keep the device awake. See the lock state in real time. Perfect for recipes or presentations.
QR Code from Camera Snapshot - Online Freeze & Decode
Freeze your live camera, then scan a QR code from the static frame. Works when auto‑scan fails. Private.
Video Keyframe Extractor - Online Capture I‑Frames
Seek through a video and extract only keyframes as JPEGs. Perfect for generating thumbnails. Canvas‑based.
Live Barcode/QR Scanner - Online Camera Decoder
Open your camera and scan barcodes or QR codes in real time. Uses ZXing JS. No data sent anywhere.
Local Password Breach Checker - Online k‑Anonymity
Tell if your password has appeared in data breaches without sending the full password. Uses hash prefix locally.
Screen Color Depth Checker - Online 8‑bit vs 16‑bit
See your monitor's color depth and pixel depth. Detect if HDR or wide gamut is available using media queries.
Board Game Score Keeper – Online Customizable Point Tracker
Add player names and tap +/- to track scores. Custom starting points. Works for any game.
On‑Screen Pixel Ruler - Online Measure Elements in Browser
Drag a virtual ruler across your screen to measure pixel distances. Horizontal and vertical guides. Useful for UI designers checking alignment.
Notification Permission Checker - Online Manage & Test
See your current notification permission status. Request or reset it. Test browser notification behavior.
Local JSON Data Explorer - Online Browser Storage Viewer
View, edit, and manage JSON objects saved in your browser's localStorage. Delete, export, or import keys. No setup.
Minimum Time Zone Clock - Online World Time at a Glance
See current time in multiple pre-selected cities simultaneously with day/night indicators. No tracking, just a simple multi-clock.
Webcam Recorder - Online Capture Video & Save
Use your webcam to record a video clip and download it as WebM. Adjust resolution and see a preview. Works offline.