Tools
Handy tools you can use without logging in. What you type is processed in your browser and is mostly never sent to the server.
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Hangul Fixer
Fix Korean text and file names made on a Mac that appear as separated jamo or garbled on Windows. Supports NFD↔NFC conversion, jamo joining/splitting, batch file-name conversion and encoding-mismatch recovery.
Character Counter
Counts characters and UTF-8 / EUC-KR bytes as you type. Handy for cover letters and text-message limits.
Text Cleaner
Remove line breaks, tidy spaces, drop duplicate lines, sort lines, convert full/half-width and straighten quotes in one click. Made for cleaning up copied text.
Markdown Preview
Write Markdown and see the result right next to it. Headings, lists, tables, code, quotes and checkboxes are supported, and you can copy the finished HTML. Optionally preview it with the same renderer the boards use (converted on the server).
Subtitle Editor (SRT · VTT)
Shift a subtitle file’s timing, stretch it to match a video’s frame rate, or fix everything by matching just two scenes. Also converts SRT ↔ VTT, wraps lines, strips tags and flags overlaps and subtitles that flash by too fast. Files are never uploaded.
Typing Practice
Measure your typing speed with proverbs, short sentences and longer passages — keystrokes per minute for Korean, WPM for English — plus accuracy and the characters you got wrong. You can also practise on your own text, and nothing you type is sent to a server.
Text to Speech
Reads your text aloud. Choose the speed, pitch and volume; it plays sentence by sentence and highlights the one being read. Only voices installed on your device are used by default, so your text does not leave it.
Word cards
Paste a front/back word list and review it with Leitner boxes — cards you know come back later, cards you miss come back soon. Your decks and progress stay in this browser.
Font preview
Upload a font file from your computer (TTF, OTF, WOFF, WOFF2) to see how text looks and how much Hangul it supports. The file never goes to a server.
Symbols & Fancy Text
Click-to-copy special characters and emoji, plus a converter that turns English text into styles like 𝐁𝐨𝐥𝐝 or 𝓢𝓬𝓻𝓲𝓹𝓽.
Date & time
Age & Date Calculator
Korean legal age, D-day, 100-day and yearly anniversaries, the span between two dates, N days or months later, and business days excluding holidays.
Lunar Calendar
Convert between solar and lunar dates, browse a lunar calendar with leap months, sexagenary names, solar terms and holidays, and find the solar dates of lunar anniversaries.
Timer, Stopwatch & Pomodoro
A countdown timer, a stopwatch with laps, and a 25/5 Pomodoro. It rings and notifies when time is up, and the remaining time shows in the tab title.
Time Zones & World Clock
See the current time in many cities at a glance, and convert a meeting time to other time zones. Daylight saving time is handled automatically.
Weekly Timetable
Build a weekly timetable from day and time blocks, save it as an image (PNG), or turn it into a weekly repeating calendar file (.ics) for Google or Apple Calendar with holidays skipped.
Calculate & convert
Calculator
A calculator from basic arithmetic to trigonometry and logs, plus VAT, discount, percent, bill-splitting, loan-interest and amount-in-words calculators, and unit/date expressions such as “5km + 300m to mi” or “today + 100 days”. Everything is computed on this page and history stays in this browser.
Unit converter
Convert length, weight, temperature, area and volume, including traditional Korean units such as pyeong, geun, don and ja.
Color Converter
Convert HEX, RGB, CMYK and HSL color codes to each other, and check text/background contrast (WCAG) and palette combinations.
Quote & statement maker
Enter your items to get a document preview with supply value, VAT and total (with the amount in Korean words), then print it or save it as a PDF. Nothing you enter is sent to a server.
Salary & Payroll Calculator
Take-home pay after Korean social insurance and income tax, weekly-holiday allowance, severance pay and unemployment benefit. Uses that year's rates; nothing you enter leaves this browser.
Real Estate Calculators
Korean brokerage fee caps, home acquisition tax, jeonse-monthly rent conversion and LTV/DSR loan limits. Reference calculations using that year's rules; nothing you enter leaves this browser.
Location Data Converter
Convert between GPX, KML and GeoJSON, transform WGS84 and Korean TM / UTM-K coordinates, switch coordinate notations, and compute distance and bearing. Files and coordinates never leave this browser.
Ruler & level
Use your phone or monitor as a ruler (calibrated with a bank card), check level with the tilt sensor, and measure angles with an on-screen protractor. Measurements never go to a server.
Excel & CSV Analyzer
Open CSV or xlsx files to search, filter and sort, see per-column statistics, and a simple pivot (group totals) with bar charts. Files are processed only in this browser and never uploaded.
Dev & security
Developer Tools
Twenty-eight everyday developer helpers in one place (now with subnet/CIDR, chmod, an HTTP/MIME/port reference, robots/sitemap and dummy data): URL, Base64, HTML and Unicode encoding, JSON formatting, CSV and type generation, Unix time, JWT decoder, hashes, UUIDs, regex, text diff, number bases, cron, certificate/CSR and mail header readers, business registration number checks, and a table converter.
Code Formatter (Beautifier)
Tidy HTML, CSS, JS, JSON, PHP, Java, Kotlin, Shell, Python, SQL, XML and YAML with tabs or spaces (2, 4 or 8), then copy it or export it as colored HTML. Your code is never sent to the server.
Code Minifier
Remove comments and unnecessary whitespace from HTML, CSS, JS and JSON to cut file size. Paste code or open a file (drag and drop works), then copy the result or download a .min file. Your code is never sent to a server.
JSON, XML & YAML Parser
Paste or open a JSON, XML or YAML file to validate it (with the exact line and column of any error), browse it as a collapsible tree, search values and keys, look values up by path, pretty-print or minify it, and convert between formats. Everything runs in your browser — your input and files are never sent to a server.
CSS Generator
Build gradients, shadows (box/text-shadow), rounded corners (border-radius) and flex/grid layouts while watching them, then copy the CSS. Nothing is sent to a server.
Password Generator
Create a hard-to-guess password from a length and character types, or as an easy-to-remember word combination (passphrase). The result never leaves this page.
What is my IP
Check your public IP address and approximate location.
File & Text Encryption
Encrypt and decrypt text or files with a password using AES-256. Everything happens in this browser; your text, files and password are never sent to a server.
Web Page & RSS Checker
Enter an address and our server visits it to check titles, descriptions, Open Graph preview data, response headers, redirects and the SSL certificate expiry — or inspect an RSS/Atom feed for common problems.
Diagram Maker
Draw flowcharts, sequence, ER and Gantt diagrams from text and save them as SVG or PNG (Mermaid syntax). Your text is never sent to a server.
Images, QR & fun
Image Tools
Shrink, crop and adjust photos, paint with a brush, stack images as layers, and remove location data (EXIF). Also makes favicon sets, picks key colors and converts to Base64. Files never leave your browser.
QR Code Generator
Turn a link, text, Wi‑Fi login or contact (vCard) into a QR code and download it as PNG or SVG. No login needed, and what you type is not stored.
Metronome & Tuner
A metronome (BPM, time signature, tap tempo) and a tuner that reads the pitch of a sound through the microphone (guitar, ukulele and more). Sound is processed only on this device — never recorded or sent.
Ladder & Random Picker
Enter names to pick winners, split teams, play the ladder game, spin a roulette, flip cards or arrange seats. Dice, coin and lotto numbers too. Names never leave your browser and randomness comes from Web Crypto.
Sketchpad
A hand-drawing tool with a pen, highlighter, line, rectangle and ellipse; an eraser that removes whole strokes; and undo. Save as PNG or SVG — your drawing is never uploaded.
Voice & Screen Recorder
Record your microphone, screen or webcam right in the browser and save the file. Video and audio are processed only inside this browser and never sent to a server.
Magnifier
Use your phone camera to read tiny print: zoom in, raise the contrast and freeze the picture to read slowly. The video never leaves your device.
LED banner
Turn your phone into an LED sign — show big scrolling, static or blinking text. For airport pickups, concerts and shop notices. Your text never goes to a server.
Audio Trimmer
Open an audio file, see its waveform, cut a section, apply fades, gain, normalization and mono, then save it as a WAV. The audio never leaves your browser.
Device Check
Test your camera, microphone, left/right speakers, keyboard input, and screen dead pixels and refresh rate right in the browser. Video and audio are never saved or sent to a server.
QR & Barcode Scanner
Read QR codes and barcodes from your camera or a photo, with the content classified and warning signs flagged. You can also make barcodes. Video and photos are never sent to a server.
PDF Tools
Merge PDFs, delete, rotate and reorder pages, save PDF pages as images, or bundle images into a PDF. Files are processed only in this browser and never uploaded.
Photo Text Reader (OCR)
Turn the text in photos and screenshots (Korean and English) into text you can copy. Photos are never uploaded; everything runs in this browser.
Use offline too
When turned on, tool pages and the files they need are saved on this device so the calculation and conversion tools work without internet. You can also install just the tools on your home screen.
Saving needs a few MB after you turn it on (large tools add more when used). Login information is never saved, and you can turn it off any time. Tools that need the server, such as the QR maker, web page checker, My IP and secret notes, do not work offline.