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Find web tools by purpose, including text, images, GIF, PDF, HWP, Office documents, archive files, calculators, and unit converters.
PNG Image Compressor
Shrink PNG images while keeping quality.
JPEG/JPG Image Compressor
Shrink JPEG and JPG images.
WebP Image Converter
Batch convert WebP images to JPG or PNG.
HEIC/HEIF Image Converter
Batch convert iPhone HEIC/HEIF photos to JPG or PNG.
AVIF Image Converter
Batch convert AVIF images to JPG or PNG.
Image Resizer and Format Converter
Resize images by pixels, ratio or social media presets and change formats.
PNG Sprite Cutter
Cut sprite sheets into individual transparent PNGs.
PSD Viewer
Open Photoshop (PSD) files without installing anything.
GIF / Animated WebP Maker
Turn multiple images into an animated GIF or WebP.
GIF Compressor
Shrink GIF animations.
GIF ↔ WEBP Converter
Convert between GIF and WebP.
Image to PDF Converter
Combine images into one PDF or convert each to a PDF.
PDF Compressor
Shrink PDF files.
PDF to JPG Converter
Convert PDF pages to high-quality JPG images.
PDF Merger
Combine multiple PDFs and JPGs into one PDF.
PDF Splitter
Split a PDF by page range or into single pages.
PDF Organizer
Reorder, rotate and delete PDF pages.
PDF Unlock
Remove the password from a protected PDF.
Protect PDF with Password
Protect a PDF with a password using AES-256.
PDF Editor
Add text, images, shapes and drawings to a PDF.
HWP/HWPX Document Viewer
Open HWP/HWPX documents and copy text without installing anything.
HWPX Document Compressor
Optimize images in HWPX documents to reduce file size.
DOCX Document Compressor
Optimize images in Word (DOCX) files to reduce file size.
PPTX Document Compressor
Optimize images in PowerPoint (PPTX) files to reduce file size.
XLSX Document Compressor
Optimize images in Excel (XLSX) files to reduce file size.
Math Expression Calculator
Enter fractions, powers and trig functions textbook-style and calculate.
Percentage Calculator
View and calculate four practical percentage calculations for everyday use in one place.
Loan Interest Calculator
Calculate monthly payments and total interest by repayment method.
Salary Calculator
Calculate take-home pay with tax-free income and dependents.
Part-Time Wage Calculator
Calculate weekly holiday, night, overtime and holiday pay from your hourly wage.
VAT Calculator
Calculate VAT from the supply amount or the total.
BMI Calculator
Enter your height and weight to instantly check your BMI and ideal body weight.
Electricity Bill Calculator
Estimate this month's electricity bill from your appliances and usage.
GPA Calculator
Calculate major and overall GPA on a 4.5 or 4.3 scale.
Unix Timestamp Converter
Convert between Unix timestamps and human-readable date/time formats. Also shows the current timestamp.
Date Calculator
Count days between dates, find dates before or after, and track anniversaries.
URL Encoder / Decoder
Percent-encode strings for URLs, or decode encoded strings back to plain text.
Base64 Text Encoder / Decoder
Encode text into Base64 format, or decode Base64 strings back to plain text.
Base64 Image Converter
Convert image files to Base64 strings, or restore Base64 data back to images.
Base64 File Converter
Convert any file to a Base64 string, or restore Base64 data back to the original file.
Hash Generator
Generate MD5 and SHA hashes at once in 39 text encodings.
UUID Generator
Generate UUID v1, v4, v7, GUID, ULID, NIL, and other unique identifier formats, then copy them instantly.
QR Code Generator
Quickly create QR codes for URLs, Wi-Fi, text, contacts, locations, and more.
Text Editor
Edit multiple documents in tabs with undo, redo, save, find and replace, and go-to-line features.
Text Diff
Analyze and compare differences between two texts by line, word, character, or sentence.
Text Utilities
Remove spaces and duplicate lines, change case and count characters.
SMI to SRT Subtitle Converter & Sync Adjuster
Convert SMI subtitles to SRT and adjust sync.
File Security Analysis
Detect malicious, tampered and disguised files.
Photo Privacy Checker & Remover
Check and remove personal data such as location from photos.
Image AI / Watermark Detector
Check images for AI-generation traces and watermarks (C2PA).
My IP Address Info
Check your public IP, location, ISP and connection details.
Live Radio Streaming
Listen to live KBS, MBC, SBS and other radio stations.
Piano Lab
Play an 88-key grand piano with real sampled sound.
Code Highlighter
Add syntax highlighting to code and convert it to blog-ready HTML.
Code Formatter
Neatly format HTML, XML, CSS, JS and JSON code.
HTML Formatter
Open the HTML tab directly to format and indent HTML source code.
XML Formatter
Open the XML tab directly to format and indent XML document structures.
CSS Formatter
Open the CSS tab directly to organize stylesheets into a consistent, readable format.
JavaScript Formatter
Open the JavaScript tab directly to format code and improve readability.
JSON Formatter
Open the JSON tab directly to format and indent JSON data.
JSON Viewer
Format and indent JSON data for readability, and explore its structure.
JSON Editor
Edit, format, validate, and sort your JSON data.
JSON Diff
Compare two JSON datasets to identify added, removed, and changed items, including type differences.
Length
Instantly convert 13 length units including meters, yards and cheok.
Area
Instantly convert 11 area units including square meters, pyeong and acres.
Weight
Instantly convert 12 weight units including kg, lb, don and geun.
Volume
Instantly convert 15 volume units including liters, gallons, hop and doe.
Data Converter
Convert data sizes such as KB, MB and GB using SI or IEC standards.
Time Converter
Add up days, hours, minutes and seconds and convert between time units.
Speed Converter
Convert 12 speed units including km/h, mph, knots and Mach.
Temperature Converter
Instantly convert Celsius, Fahrenheit, Kelvin and Rankine.
Pressure Converter
Convert 14 pressure units including atm, Pa, bar and psi.
Fuel Economy Converter
Convert fuel economy between km/L, L/100km and mpg.
Web Bible
Read and search the Bible on PC and mobile.
Online Hymn
Search and view hymn sheet music and lyrics.
Minesweeper
A classic minesweeper game providing 3 levels of difficulty: Easy, Medium, and Hard.
Sudoku Puzzle
Classic 9x9 Sudoku puzzles from easy to hard.
Maze Escape
An engaging web game where you escape mazes of varying difficulty levels while competing for clear times and rankings.
Middle School English Word Quiz
A quiz game for 1,554 essential middle school English words with pronunciation.
Middle School English Listening Dictation
Practice English dictation with past middle school listening tests.
Piano Game
A piano rhythm game where you hit the keys as notes fall.
English Etymology
Learn English words through their roots with cards and quizzes.