Styled QR Code Generator - Online Custom Design & Logo
Create QR codes with custom colors, gradients, and an embedded logo. Download as high-quality PNG/SVG. Fully local generation.
UD5 Toolkit
Create QR codes with custom colors, gradients, and an embedded logo. Download as high-quality PNG/SVG. Fully local generation.
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.
Enter a UPC or EAN barcode number and validate the check digit. See if it's a real product code. Local calculation.
Encrypt and decrypt messages using the classic Caesar cipher with configurable shift key. Fun for puzzles and basic cryptography lessons. Entirely browser-based.
Generate a self‑signed X.509 certificate and private key for local development. All created in your browser. No server involved.
Easily apply ROT13 cipher to obfuscate or reveal text. A classic letter substitution cipher that works bidirectionally. Purely client-side processing.
Add Vietnamese diacritics to plain text by selecting tones. Remove them from text. For language learners.
Apply a classic Caesar shift cipher with any key. Encrypt or decrypt text instantly. Brute force option included.
Paste rich text and clean it to plain text. Normalize line endings and whitespace. Prepare for code or databases.
Press any key to see the complete KeyboardEvent properties: key, code, keyCode, modifiers. Indispensable for game & shortcut developers.
Click on a fold technique (spiral, crumple) and see a predicted color pattern. Print folding guide.
Complete a series of visual pattern puzzles and get a fun estimated score. Purely for entertainment. No data collected.
Convert illuminance units: lux, foot-candle, phot. Useful for lighting design and photography. Quick and free.
Interactive soprano recorder chart showing which holes to cover for each note. Switch between baroque and German fingering.
Automatically adjust brightness, contrast, and saturation of a photo. Click to enhance and download. Canvas‑based.
Remove all EXIF, IPTC, and XMP metadata from your photos. Strip GPS location. Protect your privacy before upload.
Eliminate duplicate lines from text instantly. Keep only unique lines or see which lines were removed. Handy for cleaning email lists and raw data.
Convert any text to proper sentence case. Capitalize the first letter after every period, question mark, or exclamation.
Load an audio file and visually trim it by dragging handles on the waveform. Export the trimmed clip. All local.
Convert popular pet bird ages (budgie, cockatiel, macaw) to human years. Lifespan reference included. Fun educational tool.
Set a meditation session with singing bowl sounds at start, interval chimes, and end bell. No ads, pure serenity.
Select meat type and enter weight to get recommended cooking time and temp. Built-in timer with alarm.
Identify countries from their flags. Multiple difficulty levels and regions. Track your high score. Educational geography game. Works offline.
Look up quick facts about any country: capital, population, currency, flag, and continent. Static data, fast search. Great for travel and education.
Generate a pop signal to determine if speakers are wired in phase. Quick stereo test.
Visually configure scroll‑snap containers and items. Adjust alignment, stop behavior, and padding. Copy the clean CSS instantly.
Generate the MD5 hash of any text string. For quick integrity checks. All local computation.
Format a list of Q&A pairs and export as a CSV ready for Anki import. Simple line‑based template. Local.
Style underlines, overlines, and strike-throughs with colors, wavy styles, and thickness. Modern CSS text‑decoration.