Tie‑Dye Pattern Visualizer – Online See Fold & Dye Result
Click on a fold technique (spiral, crumple) and see a predicted color pattern. Print folding guide.
UD5 Toolkit
Pattern Recognition Test — Sharpen Your Mind
Test your pattern recognition skills with 10 engaging puzzles. Spot sequences, identify shapes, and apply logical reasoning — all under time pressure!
Click on a fold technique (spiral, crumple) and see a predicted color pattern. Print folding guide.
Identify countries from their flags. Multiple difficulty levels and regions. Track your high score. Educational geography game. Works offline.
Encrypt and decrypt messages using the classic Caesar cipher with configurable shift key. Fun for puzzles and basic cryptography lessons. Entirely browser-based.
Apply a classic Caesar shift cipher with any key. Encrypt or decrypt text instantly. Brute force option included.
Easily apply ROT13 cipher to obfuscate or reveal text. A classic letter substitution cipher that works bidirectionally. Purely client-side processing.
Enter a UPC or EAN barcode number and validate the check digit. See if it's a real product code. Local calculation.
Upload a logo to embed in the center of a QR code. High error correction so it still scans. Download PNG/SVG.
Generate a QR code with a custom icon or logo in the center. Choose error correction level. Download as high‑res PNG.
Create high-quality QR codes for URLs, text, Wi-Fi, and contact info. Customize colors and size. Download as PNG/SVG. No data leaves your device.
Create QR codes with custom colors, gradients, and an embedded logo. Download as high-quality PNG/SVG. Fully local generation.
Generate a self‑signed X.509 certificate and private key for local development. All created in your browser. No server involved.
Add Vietnamese diacritics to plain text by selecting tones. Remove them from text. For language learners.
Generate a pop signal to determine if speakers are wired in phase. Quick stereo test.
Eliminate duplicate lines from text instantly. Keep only unique lines or see which lines were removed. Handy for cleaning email lists and raw data.
Press any key to see the complete KeyboardEvent properties: key, code, keyCode, modifiers. Indispensable for game & shortcut developers.
Convert illuminance units: lux, foot-candle, phot. Useful for lighting design and photography. Quick and free.
Load an audio file and visually trim it by dragging handles on the waveform. Export the trimmed clip. All local.
Interactive soprano recorder chart showing which holes to cover for each note. Switch between baroque and German fingering.
Paste rich text and clean it to plain text. Normalize line endings and whitespace. Prepare for code or databases.
Set a meditation session with singing bowl sounds at start, interval chimes, and end bell. No ads, pure serenity.
Automatically adjust brightness, contrast, and saturation of a photo. Click to enhance and download. Canvas‑based.
Select meat type and enter weight to get recommended cooking time and temp. Built-in timer with alarm.
Remove all EXIF, IPTC, and XMP metadata from your photos. Strip GPS location. Protect your privacy before upload.
Look up quick facts about any country: capital, population, currency, flag, and continent. Static data, fast search. Great for travel and education.
Convert popular pet bird ages (budgie, cockatiel, macaw) to human years. Lifespan reference included. Fun educational tool.
Convert any text to proper sentence case. Capitalize the first letter after every period, question mark, or exclamation.
Create a random, aspirational quarterly objective with unrealistic key results. For meeting icebreakers.
Generate a grand, aristocratic title like 'Duke of Waffleshire'. Perfect for silly fun or RPG characters. Local.
Create a customizable checkerboard or grid background using pure CSS gradients. Adjust cell size and colors. Copy the code.
Re‑order words to sound like Master Yoda. Not perfect, but amusing, this tool is. Local and quick.