Browser tools that don't upload your files.

Reduce image file size with quality control.

Convert between PNG, JPG, WebP, AVIF.

Resize images to any resolution.

Drag to crop the area you want.

Combine multiple images into one PDF.

Resize + convert + compress at once.

Convert SVG files to high-resolution PNG.

Convert iPhone HEIC photos to JPG/PNG.

Create animated GIF from multiple images.

Convert images to favicon in various sizes.

View prompts and settings from AI-generated images.

Extract text from photos, screenshots, receipts, and business cards in Korean, English, Japanese, or Chinese.

Click any pixel to grab its color, or auto-extract a 5/8/10/16-color palette from the whole image.

Apply grayscale, sepia, invert, blur, brightness, saturation, and contrast — and download at original resolution.

Encode an image as a Base64 data URI. Get the URI plus ready-to-paste HTML <img> and CSS background-image snippets.

Rotate by 90/180/270° or any custom angle, and flip horizontally or vertically. Full resolution preserved.

Overlay two images and slide horizontally or vertically to compare. Great for before/after retouches, filters, and design changes.

Generate 72/96/128/144/152/180/192/384/512px PWA icons plus a ready-to-paste manifest.json snippet from one square source image. Bulk ZIP download.

Combine multiple photos into a single grid image for Instagram, stories, or chat. 9 grid layouts plus gap, background color, rounded-corner controls. Square / 4:5 / 9:16 / 16:9 outputs.

Add a clean border, polaroid frame, square padding, or drop shadow to a photo before posting. Four styles with width / color / caption controls. Full-resolution PNG.

Stitch multiple photos into one image — vertically or horizontally. Drag thumbnails in the preview to reorder, with gap and background color options. Mobile touch drag supported.

Slice one photo into 1×3, 3×3, 2×2 grids — perfect for Instagram feed-grid art that reads as a single image on your profile. 1080×1080 squares, ZIP bulk download.

Combine multiple PDFs into one.

Extract or split pages from a PDF.

Convert PDF pages to PNG or JPG.

Rotate and delete pages at a glance.

Add Korean/English/Japanese text watermarks to every page. Diagonal, opacity, and rotation supported.

Insert page numbers across every page of a PDF — common formats and custom templates supported.

Pull all text out of a PDF and save as .txt. Optional page separators; works with Korean / Japanese / Chinese fonts.

Remove location & device info from photos.

Add text watermarks to images.

Hide parts of an image with mosaic, solid color, or marker.

Auto-detect and mask emails, phone numbers, IDs, credit cards, and IPs in text. Korean RRN and business numbers supported.

Strip hidden author, title, creator and timestamp metadata from PDF files in one click.

Extract birthday, gender, nationality, age, zodiac sign, and Korean zodiac animal from a Korean Resident Registration Number — plus checksum validation. Input never leaves the browser; no localStorage or cookies used.

Format, minify, and validate JSON.

Convert text to/from Base64.

Convert Markdown to HTML in real-time.

Fix broken Korean character separation.

Count characters, words, lines, bytes in real time.

Fix text typed in wrong keyboard layout.

Convert to uppercase, lowercase, title case, etc.

Convert between CSV and JSON formats.

Compare two texts and highlight differences.

Generate MD5, SHA-1, SHA-256, SHA-512 hashes from text or files.

Instantly decode JWT header, payload, and metadata.

Generate v4, v7, v1, and NIL UUIDs in bulk.

Percent-encode or decode URLs and query strings.

Convert between binary, octal, decimal, and hex — all four shown live with bit grouping.

Convert numbers to Korean Hangul, formal Hanja (壹貳參), English, and Japanese — for receipts and contracts.

Two-way YAML and JSON conversion for Kubernetes, Docker, Ansible, and CI configs.

Translate cron into plain English and preview the next 5 runs.

Convert Korean Hangul to the official Revised Romanization (RR). Name mode, hyphen, and pronunciation-aware options.

Generate TypeScript interfaces from JSON. Nested objects, array & union inference, optional-field option.

Sort, dedupe, shuffle, and case-convert text by line. Tame email lists, logs, CSVs, and keyword dumps.

Indent minified HTML or compress it back to one line. Adjustable indent width; pre / script / style / textarea content preserved.

Auto-format raw digits into 010-1234-5678. Detects mobile vs. area-code lines, optionally adds +82 international, batch-processes multiple numbers.

Turn Korean / English titles into URL-safe slugs. Hangul is auto-romanized (Revised Romanization) before slugification.

Shift the English alphabet by N positions. ROT13 preset, slider for any shift, symmetric (same shift to encode and decode).

Compare two JSON documents and visualize added, removed, and changed keys as a tree.

Search every HTTP status code (200, 404, 500, …) with plain-language descriptions and use cases.

Two-way HTML entity encoding (&amp;, &lt;, &gt;, &#38;) with named, numeric, and ASCII-only options.

Search file extensions and MIME types both ways, with category filters for image, audio, video, application, text, and font.

Build Markdown tables in a visual editor with row/column controls and per-column alignment. GitHub & Notion compatible.

Test and validate regular expressions in real time.

Generate Korean dummy text for design and development.

Convert between Arabic and Roman numerals (1–3999) in either direction. 1999 ↔ MCMXCIX. For movies, watches, and classics.

Bidirectional text ↔ Morse code with audio playback (ITU standard, 20 WPM).

Indent minified CSS or compress it back. Handles @media, nested rules, and comments. Configurable indent and "strip comments" option.

Generate classic English Lorem ipsum dummy text by paragraph, sentence, or word count. Optional starting phrase.

Convert HTML to GitHub Flavored Markdown. Tables, inline code, links, and images all supported. Pick your heading and emphasis style.

Auto-extract a table of contents from Markdown headings with GitHub-style anchors. Configure depth, skip the first H1, choose a bullet marker. Korean headings supported.

Sort JSON keys alphabetically. Deep (nested) toggle, ascending/descending, indent options. Array element order is preserved.

Beautify SQL queries with auto indentation and line breaks. Supports 8 dialects (MySQL, PostgreSQL, SQLite, BigQuery, etc.) plus keyword case and indent options.

Draw a signature and save as transparent PNG.

Generate QR codes for text, URL, Wi-Fi, contacts.

Read QR codes from camera or image files.

Extract images and videos from PPT at once.

Pick specific slides and save as a new PPTX.

Generate secure random passwords instantly.

Convert between HEX, RGB, HSL color codes.

Convert between Unix timestamp and date.

Generate UTM parameter links for marketing.

Convert length, weight, temperature, area, time, and data units — including pyeong (Korean).

Calculate international age, Korean age (counting), year-age, and D-day to next birthday.

Count days to or from any date. Auto-suggests 100 / 1000-day anniversaries.

Build linear, radial, and conic gradients visually and copy the CSS.

Compute BMI, ideal weight, and BMR from height & weight. Korean (KSSO) and WHO thresholds shown together.

Build CSS box-shadow visually with multi-layer and inset support, then copy the code.

Compare times across Seoul, NYC, LA, London, Tokyo and more — DST handled automatically.

Pick lunch, names, or numbers at random — with a roulette animation and multi-pick support.

Check contrast ratio and WCAG AA/AAA pass status for any foreground/background pair.

Compare monthly payments and total interest across equal-payment, equal-principal, and balloon repayment schedules.

Split a bill evenly or settle when people paid different amounts — see who owes whom with the fewest transfers.

Enter annual gross salary; auto-deducts 4 social insurances + income tax + local tax. Monthly/yearly net pay and itemized breakdown.

Plan wake-up or bedtime based on 90-minute sleep cycles so you wake between cycles, not in deep sleep.

Change one dimension and the other auto-scales to keep the ratio. Presets for 16:9, 4:3, 9:16, 1:1, with a visual preview.

Edit CSS animation easing functions on an SVG curve. Drag control points, preview the motion live, copy the CSS.

Count business days between two dates with Korean public holidays excluded. Optional Saturday-as-working setting and a list of holidays in range.

25-min focus, 5-min break cycles with audio alerts and a circular progress ring. Customizable durations.

Add or extract VAT in two directions. Korea 10% default; configurable rate including 0% (zero-rated / exempt).

Stopwatch (0.01s precision, lap times) and countdown timer with audio alert — on one screen.

Build mailto: URLs and HTML <a> tags from to / cc / bcc / subject / body fields. Drop into your "Contact" link.

Add or subtract days, weeks, months, and years from a date — or get the exact duration between two dates (years/months/days + total days).

Convert between px, rem, em, pt, and % at the same time, with adjustable root and parent font sizes.

Compute sale price and savings from price + percent, or stack multiple discounts (10% + extra 5%).

Generate Open Graph and Twitter Card meta tags with KakaoTalk, Facebook, and X preview cards.

Create card news images with text and colors.

Visually edit polygon, circle, ellipse, and inset clip-paths. Draggable vertices, live preview, 8 ready-made shapes.

Visually tune each corner radius. Simple and advanced (elliptical / fancy) modes, live preview, copy CSS.

Generate harmonious palettes from a base color: complementary, analogous, triadic, tetradic, and monochromatic. CSS-variable output.

Type IPv4 CIDR (e.g. 192.168.1.0/24) and get network, broadcast, mask, host range, and total IPs.

Build multi-layer CSS text shadows visually and copy the code. Live preview with font, size, and color controls.

Tweak blur, brightness, contrast, grayscale, hue-rotate, saturate, sepia, invert, and opacity with live sliders. Upload your own image or use the sample preview.

Enter name, phone, email, organization, etc. and download a .vcf contact file instantly. Adds to iOS / Android contacts in one tap. Pick vCard 3.0 or 4.0.

Enter title, time, location, reminder, and recurrence to download a .ics calendar file. Drops straight into Google / Apple / Outlook calendars.

Tweak translate, rotate, scale, and skew with live sliders. 2D and 3D transforms, transform-origin, and perspective supported. Copy the code in one click.

Run multiple kitchen timers at once with quick presets for ramen, eggs, microwave, and tea. Alarm sound + browser notification, works on mobile, survives page reload.

Convert between lunar (Korean / Chinese) and solar (Gregorian) dates. See your relatives' lunar birthdays, anniversaries, and ancestral rite dates in upcoming Gregorian years. Zodiac and sexagenary stem-branch shown. 1900–2099 supported.

Instantly see how strong a password is before signup or change. Length / character variety / common-pattern checks plus estimated crack time. Your input never leaves the browser.

HIIT / Tabata / circuit timer that auto-cycles work / rest / rounds / sets. Countdown beeps, screen-on lock, quick presets (Tabata, HIIT, EMOM).

Scale a recipe from 2 servings to 4 (or any ratio). Enter ingredients with quantity and unit; the tool recalculates with friendly fractions (1/2, 1/3) and lets you copy a chat-ready text. Includes a quick units cheat-sheet.

Compare deals like "100g for $5 vs 250g for $12" instantly. Auto-computes price per gram / ml / unit, highlights the cheapest, shows the savings.

Compute current pregnancy week, due date, trimester, prenatal-care milestones, and Korean 90-day maternity-leave dates from your last period (LMP) or conception date.

Auto-computed list of Korean public holidays with D-day. Eight fixed solar holidays plus three lunar ones (Lunar New Year, Buddha's Birthday, Chuseok), substitute holidays, and 3+ day long weekends detected.

Validate a Korean Business Registration Number (10 digits) with the NTS checksum algorithm. Auto-classifies into individual / corporation / non-profit / tax-exempt by the 4th–5th digits. Input never leaves the browser.

Enter distance, fuel volume, and cost per fill-up to compute fuel economy (km/L), cost per km, and running averages. Records saved locally; CSV export.

Calculate Korean severance pay under the Labor Standards Act. Enter hire date, leave date, last 3 months' wages, annual bonus, and unused-leave pay to get average daily wage, service period, and projected severance. Input never leaves your browser.

Calculate Korean statutory annual paid leave under Labor Standards Act §60. Enter hire date for under-1-year monthly leave (up to 11 days), 1+ year base 15 days, and 3+ year bonus leave (up to +10 days). Supports both hire-date and fiscal-year (Jan 1) bases.

Five percentage operations in one place: N% of X, X is what % of Y, X plus/minus N%, and X → Y percent change. For students, shopping, taxes, statistics. Live results, thousands separators.

Three time operations: duration between two times (9:00–18:00 = 9 hours), add/subtract time, and sum multiple durations (8:30+2:45). For work hours, exercise, study, runtime. Handles midnight crossover and break deduction.

Compute Basal Metabolic Rate (BMR) and Total Daily Energy Expenditure (TDEE) using the Mifflin-St Jeor equation, plus cut/maintain/bulk calorie targets and protein/water recommendations. For diet and bulking plans.

Compute Korean savings-account and deposit interest. Supports monthly-deposit savings, lump-sum deposit, simple/compound interest, and 15.4% Korean withholding tax. Monthly accumulation table included.

Two-way converter for hourly, daily, weekly, monthly, and annual wages. Default 209 hours/month (40 hr/week + Korean paid weekly rest), adjustable. For part-timers, employees, and freelancers.

Two-way converter for shoe sizes — Korea (mm) ↔ US ↔ EU ↔ Japan ↔ UK. Men, women, and kids modes. Type any field; the rest update instantly. Essential for international online shopping.

Compute Korean statutory broker fees for sale, jeonse (lump-sum lease), and monthly rent — tiered rates with caps, plus 10% VAT. Monthly-rent converted-deposit auto-computed.

Two-way clothing size converter — Korea (호수) ↔ S/M/L ↔ US ↔ EU ↔ Japan. Men, women, and kids (height cm) modes, with chest measurement reference.

Enter a child's birthdate to get the current Korean school grade, semester, and days until the next academic year. Korean school year starts March 1; uses the 2023 international-age law.

Compute GPA from per-course credits and letter grades, plus Korean 4.5 ↔ US 4.0 conversion with the WES guide. For university semesters, grad-school applications, study abroad, and resumes.

Predict a child's adult height from the parents' heights using the medical mid-parental height formula, with a 95% confidence interval of ±8.5 cm.

Calculate Korean annual vehicle tax under the Local Tax Act: engine displacement × per-cc rate + age discount + 30% local-education tax + 5% lump-sum discount. Supports passenger cars and EVs/FCEVs.

Calculate Korean real estate acquisition tax under the Local Tax Act: 1-home tiered rates (1–3%), multi-home surtax (8/12%), regulated-zone, rural-special tax, and local-education tax with 85 ㎡ size split.

Compute Korean 4 social insurances (National Pension, Health, Long-Term Care, Employment, Industrial Accident) — employee and employer shares per item. 2026 rates with tax-free allowance support.

Compute weighted-average cost basis from multiple buys, plus break-even price and live P&L when you enter a current price. Korean brokerage fees (0.015%) and sell tax (0.2%) applied.

Compute Korean housing-subscription points under the Housing Supply Rules: years without home (32pt) + dependents (35pt) + savings-account tenure (17pt) = 84 max.

Convert Korean jeonse (lump-sum lease) deposit ↔ monthly rent (deposit + monthly). Auto-applies the Housing Lease Protection Act conversion-rate cap (base rate + 2% or 10%, whichever is lower).

Convert food calories into exercise time for 60+ common Korean foods and 15 activities. How many minutes of running to burn off ramen, fried chicken, or pork belly? MET-based calculation with your body weight.

Convert your dog or cat's age to human-equivalent age. AVMA-based formula by dog breed size (small/medium/large/giant) and a separate cat formula. Life stage and average lifespan included.