UD5 Toolkit
Zero‑Width Character Detector - Online Find Hidden Unicode
Paste text and instantly see if it contains hidden zero‑width characters often used in steganography. Reveal invisible payloads.
Tag: Detector - Browser Feature Test
10+ toolsWhat Font is Used on a Website - Online Detector
Enter a URL and extract the font stacks and web font URLs used on that page. Quick typography research.
Offline Page Detector - Online See Cached Content
Check if the current page can be loaded offline by examining the service worker cache. Developer tool for PWAs.
Webcam Color Detector - Online Live Hue Picker
Point your camera at an object and see the dominant color in real time. Click to copy the hex. Fun tool for designers.
Dominant Color Detector - Online Find Main Hue
Upload an image and instantly see its most dominant color as a hex swatch. Uses color quantization. Local.
Screen Resolution Detector - Online Viewport Size Checker
Detect your current screen resolution, viewport dimensions, and device pixel ratio. Useful for responsive design testing. No data collection.
File MIME Type & Magic Bytes Detector - Online
Drop a file to see its MIME type and the first few magic bytes (hex and ASCII). No upload, works instantly.
Voice Pitch Detector - Online Live Mic Frequency
See the fundamental frequency (pitch) of your voice in real time using auto‑correlation. For singers and speech training. No upload.
Bias Detector Tool - Online Check Text for Subjective Language
Analyze text for subjective and emotionally charged words. Helps identify potential bias in writing. Purely heuristic, local operation.
File Encoding Checker - Online Detect Text File Charset
Upload a text file to detect its character encoding (UTF-8, ISO-8859-1, etc.) and BOM presence. Runs entirely in your browser.