All 129 free online tools

Compress & convert JPG, PNG, WebP, AVIF and resize. 100% in-browser.

Remove photo backgrounds with AI, in your browser. No upload.

Extract text from images. Korean & English. No upload.

Generate favicon.ico, PWA icons, and manifest from one image.

Crop to passport/ID specs at 300dpi with a print sheet. No upload.

Combine photos into one — vertical, horizontal or grid, with gap & background. No upload.

Crop, rotate, flip and resize photos in your browser — nothing uploaded.

Drag to mosaic or blur faces, IDs and plate numbers. All in your browser, nothing uploaded.

Add a text or copyright watermark — position, size, opacity or full tile, all in your browser.

Shrink a photo under a target KB — hit 100KB/200KB upload limits. No upload.

Turn source code into a beautiful image with syntax highlighting.

Strip GPS location and EXIF from photos. Batch, no upload.

Use your phone camera to enlarge small print — freeze & flashlight, no install. Nothing saved.

Combine PDFs or split by page ranges. No upload.

Draw or upload a signature and place it on a PDF. No upload.

Turn Word (DOCX), images, Markdown and TXT into PDF. 100% in-browser, no upload.

Shrink PDF file size — great for scanned/image PDFs, in-browser, no upload.

Convert each PDF page to a JPG/PNG image. Resolution options, ZIP download, no upload.

Delete, rotate and reorder PDF pages from thumbnails — in your browser, no upload.

Combine JPG/PNG/HEIC images into one PDF. Order & page size, no upload.

Convert iPhone HEIC photos to JPG/PNG/WebP, right on your device.

Length, weight, temperature, data size, and live currency.

Convert between CSV and JSON with proper quote handling.

Encode and decode text, URLs and files as Base64 — Unicode-safe.

Convert between binary, octal, decimal, hex and any base (2–36). Big-integer accurate, no upload.

Spell out an amount in Korean (e.g. 삼천오백만) with a contract form. No upload.

Convert Excel (XLSX) to and from CSV and JSON, entirely in your browser with no upload.

Percent-encode/decode URLs and query strings. Unicode-safe, with param breakdown.

Convert Hangul HWPX to Word DOCX — text & tables, in-browser, no upload.

Convert YAML to JSON and JSON to YAML with indent options and error messages. No upload.

Convert HTML to Markdown — rich pasted content and GFM tables included. No upload.

Trim videos or convert to GIF, in your browser. No upload.

Convert between MP3, M4A, WAV, FLAC, OGG and Opus with bitrate control — in your browser, no upload.

Cut a section of audio into a ringtone or clip, with fade in/out. MP3/M4A/WAV, no upload.

Pull the audio out of a video (MP4, MOV…) to MP3/M4A/WAV — entirely in your browser.

Korean take-home pay, loan payments, and savings maturity.

Standard weight, healthy range, BMI, obesity ratio and BMR from height, sex and weight. In-browser, free.

Daily calories and protein/fat/carb grams for your goal (lose/maintain/gain). Mifflin-St Jeor, in-browser.

Compute your GPA from course credits and grades on a 4.5 or 4.3 scale. In-browser, no upload.

GCD, LCM and prime factorization of several numbers — big-number accurate, no upload.

Add, subtract, multiply and divide fractions with reduced, mixed and decimal output. No upload.

Mean, median, mode, variance and standard deviation (population and sample) at once. In-browser.

Four percent calculations in one screen: ratio, X% of Y, increase/decrease, and percent change. No upload.

Estimate Korean car tax + education tax from displacement and age. Flat EV rate, in-browser.

Estimate a Korean residential electricity bill with progressive tiers, VAT and fund. Summer tiers included.

New average price, unrealized P/L and shares needed to reach a target average. Not live-quote linked.

Estimate your 2026 mortgage limit from income, price and rate under stress-DSR and LTV rules. In-browser.

Convert jeonse to monthly rent and back at the 2026 legal rate (4.75%). In-browser.

Compute the maximum agent fee by transaction amount from the rate table, with VAT. In-browser.

Housing acquisition tax with education and rural taxes at 2026 rates, including multi-home surcharges. In-browser.

Gross and net rental yield plus the gap (equity) at once, with loan interest. In-browser.

Predict ovulation, fertile window and next period from your last period and cycle length. In-browser.

Estimate due date, current gestational age and trimester from LMP or conception. In-browser.

Convert a dog or cat age to human years — size-based vet model and epigenetic formula. In-browser.

Split any amount into net, VAT and gross at 10%. Net/gross toggle and reverse VAT. In-browser, free.

Korea simplified-taxation VAT payable from business type and annual supply value at 2026 rates.

Korea's 3.3% freelancer and 8.8% other-income withholding — tax, net pay and reverse gross.

Estimate Korean statutory severance from start/end dates and monthly average wage.

Get margin, markup and profit from cost and price, or the price for a target margin.

Convert hourly, monthly and annual wages using Korea 209/174-hour bases.

Korea's 2026 minimum wage (10,320 KRW/h) with daily, weekly, monthly and annual conversions.

Korea weekly holiday pay from hourly wage and weekly hours, with the 15-hour eligibility check.

Korea unused annual-leave pay from monthly ordinary wage and unused days.

Break-even revenue, quantity and contribution margin from fixed cost, price and variable cost.

Korea's four social insurances from monthly salary at 2026 rates — employee and employer shares.

Korea overtime, night and holiday premiums from monthly ordinary wage and hours worked.

Card fee and net settlement from payment amount and your merchant fee rate.

Straight-line and declining-balance depreciation schedules from cost, salvage and life.

Create quotations, statements and invoices with auto VAT and save as PDF. Nothing leaves your browser.

Log BP & pulse in large text with averages and trend; print/share. Reference stages (not a diagnosis), on-device.

A calculator with big buttons and text — VAT 10%, copy result. Nothing sent.

Target age, cycle and cost for Korea's national health and cancer screenings, with an NHIS link.

Adult/senior vaccines split into free (state-funded) and recommended (paid), with a clinic finder.

Enter who paid what and get the fewest transfers to settle up. Share to KakaoTalk. On-device.

D-day countdown, age, date difference, and Unix timestamps.

A study timer that repeats 25 min focus + 5 min break, with adjustable durations and a beep. In-browser.

Discharge date, promotion dates, service progress and a D-day countdown from your enlistment date. In-browser.

Convert solar↔lunar dates, with leap months and zodiac. Verified 1900–2100 table. In-browser.

Compare times across zones for meetings. DST-aware.

Explain a crontab expression in plain language and preview upcoming run times. No upload.

By birth date, see senior benefits you qualify for now and soon — pension, free vaccines and more.

From a birth date, dates and D-day for Korean life milestones (dol, hwangap 60, 70, 80…).

From a lunar or solar date, get upcoming memorial days (solar) and the eve.

Time each subject and track cumulative study hours with a weekly chart and CSV. On-device.

Compute due dates and business days excluding weekends and Korean holidays (with substitutes).

QR codes for URLs, Wi-Fi, contacts. No expiry, no watermark.

Spin a wheel or roll numbers with fair, crypto randomness.

Generate Korean Lotto 6/45 numbers with a crypto RNG — exclude/fix numbers, multiple sets.

Generate UUID v4/v7/NIL and ULID in bulk with a crypto RNG. Uppercase/hyphen options, no upload.

Build a large-print medication chart and weekly checklist to print or share. Stored in your browser.

Make a wallet emergency medical card to print — name, blood type, meds, contacts. Stored on-device.

Play A-vs-B balance questions and random icebreakers, then share to friends. No install.

Find your animal type from questions only — no photo upload. Shareable result card.

Utilo's own 16 mood types — 16 questions and a shareable result card. Just for fun.

Put in any candidates and pick a favorite by tournament; share the winner and a link.

Enter two names for a fun match %; share the heart card. Just for fun, nothing stored.

Today's luck score, lucky color and item — a fun daily card to share. Not a prophecy.

Make front/back flashcards and study with spaced repetition. Bulk paste, stats, on-device.

Build a class timetable with overlap warnings and save it as an image (PNG). On-device.

Make an A4 report cover as PDF or image from a simple form. Nothing uploaded.

Live character, word, and byte counting with case tools.

Beautify, minify and validate JSON with line & column error locations.

Preview Markdown live and export HTML — tables, code, checklists. No upload.

Fix Korean text that looks broken across Mac & Windows. NFC/NFD.

Test regex live with match highlighting, groups and replace.

Show line-by-line differences between two texts as additions/removals. No upload.

Instantly fix text typed in the wrong Korean/English keyboard layout (dkssud↔안녕). No upload.

Click to copy arrows, symbols, currency and emoji by category, with a recent list. No upload.

Makes the Korean court case search easy: decodes your case number and links you to the official site.

Find your National Pension start age by birth year and link to the official NPS estimate. Big text.

Find the right issuer, fee and kiosk info for Korean civil documents, and link to the issuing site.

See text in very large type and have it read aloud; size & speed control. Nothing saved.

Korean gift/condolence envelope wording, customary amounts and how to sign, plus a spelled-out amount.

Difference between 과태료 and 범칙금, where to check/pay (eFine, Wetax), and the early-payment discount.

Look up a medicine on Korea's official drug site; find by pill shape, with a checklist.

Beautify or minify HTML, CSS, JavaScript and XML with indent options. In-browser, no upload.

Format SQL queries — MySQL, PostgreSQL, Oracle and more, with keyword case and indent options.

Paste Excel/CSV/tab data to get a clean aligned Markdown table with alignment options. No upload.

Turn words into Korean initial-consonant quizzes — random decks + your own, share with the answer hidden.

Generate APA/MLA/Chicago references from source details; sort by author and copy. No upload.

Convert a Korean name to English (romanization) for passports/tickets, with alternatives. No upload.

Check foreground/background contrast against WCAG AA/AAA.

Convert between HEX, RGB, HSL and CMYK, plus an on-screen eyedropper. In-browser.

Encrypt & decrypt any file with a password. No upload.

Strong random passwords and passphrases with a strength meter. No upload.

SHA-256/512 hashes for text or files, plus checksum verify. No upload.

Decode JWT header/payload, check expiry and verify HS/RS/ES signatures in your browser.

Paste a text to see common scam warning signs. A self-check, not a verdict. Nothing sent.

Scan QR/barcodes and see the link in large text — never auto-opens, preventing quishing. Nothing saved.