UD5 Toolkit
aria‑describedby Visualizer - Online Check Descriptions
Highlight elements with aria‑describedby and see the linked description text. Verify a11y annotations.
File Encoding Checker - Online Detect Text File Charset
File Encoding Checker
Easily detect the character encoding (charset) of any text file
Drag & drop a text file here
or click to browse
Detection Result
File Name: -
File Size: -
MIME Type: -
Detected Encoding: -
Confidence: -
BOM: -
Text Preview (decoded with detected encoding):
Preview shows first few lines. May be garbled if detection is inaccurate.Frequently Asked Questions
Character encoding is a system that maps characters (letters, symbols, etc.) to specific byte sequences. It determines how computers store, transmit, and interpret text data. Common encodings include UTF-8, ASCII, ISO-8859-1, and UTF-16.
Without the correct encoding, text files can appear as garbled characters or “mojibake”. Detecting the charset ensures proper display, processing, and data interchange across different systems and browsers.
This tool uses heuristic analysis based on byte patterns, byte order marks (BOM), and character frequency statistics to guess the most likely encoding. It provides a confidence score to indicate the reliability of the detection.
The underlying library (jschardet) supports a wide range of encodings including UTF-8, UTF-16 (LE/BE), UTF-32, ISO-8859-*, Windows-125*, EUC-*, GB2312, Big5, Shift_JIS, and many more. However, detection accuracy may vary for short or ambiguous files.
Yes, in many cases encoding can be inferred from byte sequences, especially if the file contains a BOM. However, without a BOM, detection is probabilistic and may not be 100% accurate. Tools like this use statistical models to make an educated guess.
Proper Noun Highlighter - Online Identify Names, Places in Text
Paste text and quickly highlight potential proper nouns (capitalized sequences). Aid for editing or anonymization. Simple regex-based, local.
Offline Capability Checker - Online Test PWA Readiness
Check if your site has a service worker registered and if it can load offline. Quick PWA readiness assessment.
TTS Reader with Word Highlight - Online Speak & Read Along
Paste any text and have it read aloud while each spoken word is highlighted. Improve reading focus. Web Speech API.
Markdown TOC Generator - Online Table of Contents
Paste your Markdown and automatically generate a linked table of contents based on headings. Insert at the top. Local magic.
HTML Minifier - Online Compress Web Pages
Reduce your HTML file size by stripping whitespace, comments, and optional closing tags. Secure browser‑based.
<datalist> Autocomplete Tester - Online ComboBox Demo
See how <datalist> works across browsers. Test with many options. Copy the minimal markup. Simple native autocomplete.
Noise Generator - Online White Brown & Pink Noise Machine
Play white, pink, or brown noise to aid focus, sleep, or tinnitus relief. Infinite loop and volume control. Works in background; no downloads.
HTML Audio Visual Emphasis - Online Highlight Spoken Words
Combine TTS with text highlighting. See each word colored as it is spoken. For e‑learning content creation. Local.
White Noise Machine - Online Sleep & Focus Sound Generator
Generate continuous white, pink, or brown noise for sleep or concentration. Adjustable volume with offline support via Web Audio API. No downloads needed.
White, Pink & Brown Noise Generator – Focus & Sleep Sounds
Play continuous white, pink, or brown noise directly in your browser. Includes a timer for sleep and volume control for office concentration.
empty‑cells CSS Property Demo - Online Table Visibility
Toggle between show and hide for empty table cells. Understand how it affects borders and backgrounds.
React Props Table Generator - Online Component Documentation
Enter a list of component props with types and defaults, and get a Markdown table ready for your Readme or Storybook.
Audio BPM Detector – Find Tempo of an Uploaded Track
Upload an MP3 or WAV file and get an estimated beats per minute using onset detection. DJs and musicians can quickly catalog track tempos.
What 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.
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.
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.
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.
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.
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.
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.