TAYSTUDIO · EST. 2026

Useful
things.

Free everyday tools.
No signup, no install — your input stays in your browser.

LIVE · 8 tools
🧮

Calculators

Universal calculators — compound interest, BMI, calorie/TDEE, body fat, ideal weight, savings, loan, D-day.
LIVE · 17 tools
📸

Image

Files never leave your browser — compress · resize · HEIC→JPG · crop · ID photo · QR · OCR · background remove (AI) · WebP/AVIF · merge · watermark · mosaic · EXIF/GPS remove.
LIVE · 10 tools
📑

PDF

Your PDFs never leave your browser — merge · split · edit (delete, reorder, rotate) · image↔PDF · watermark/page numbers · encrypt · unlock.
LIVE · 5 tools
🎬

Video

Your videos never leave your browser — ffmpeg.wasm based compress · trim · rotate · GIF · extract MP3.
LIVE · 3 tools
📝

Text

Character counter — track length and bytes for posts, essays, SMS, and SNS limits.

— About

Your inputs, images, and PDFs never leave your browser.

A collection of 43 everyday tools you can use without signup or install. Every operation runs inside your browser, so resumes, IDs, and sensitive PDFs stay private. Compound interest projections, BMI / TDEE, loan and savings, image compression, OCR, QR codes, PDF merging/encryption, EXIF/GPS removal, and video editing — common tasks finished in one place.

FAQ

Why TAYSTUDIO
Nothing leaves the browserImages, PDFs, videos, and calculator inputs are processed only in your browser. Resumes, IDs, sensitive PDFs, and salary inputs never touch our servers.
No signup · freeNo accounts, no email, no install. Open the URL and start. Usage history is not stored.
2026 latest baselinesAll calculators reflect the 2026 official Korean tax and insurance rates (national pension, health insurance, income tax brackets, minimum wage).
Sources citedEvery calculator links to its source: NTS (National Tax Service), NHIS, NPS, Ministry of Labor, and law.go.kr.
Ads and affiliates separatedAds and affiliate recommendations are clearly labeled. They do not influence the calculator outputs or recommendations.
WASM-grade processingOCR (Tesseract), AI background removal (ONNX), video transcoding (ffmpeg) — heavy workloads still run locally, at near-native speed.
Who uses it
Office workers — Jan & MayYear-end refund estimation, comprehensive income tax, salary comparison before negotiation, severance pay calculation.
Freelancers · self-employed8-bracket progressive income tax, VAT filings, real-estate capital gains simulation, business income estimates.
Job seekersUnemployment benefit calculation, ID photos sized to passport / resume standards (300 DPI), resume PDF merging and compression.
Parents · pregnancyDue date, formula concentration, weaning timing, baby clothing size, growth percentile. Korean dual-parent leave 6+6 mode.
Content creatorsInstagram 2,200-char / Twitter 280-char limits, EXIF GPS removal, video → GIF, watermarks, background removal.
Students · general useBMI, BMR/TDEE, body-fat percentage, Korean age, D-day, QR generation, OCR text extraction, HEIC → JPG.
Is it really free? Any hidden costs?

Fully free. No signup, no payment, no email required. The site is supported only by displayed ads and affiliate recommendations (Coupang Partners and similar). No tool has usage limits.

Where do my uploaded files and inputs go?

Nowhere external. Images, PDFs, videos, and calculator inputs are processed only in your browser memory and discarded after download. The server stores no inputs and keeps no logs.

We collect anonymous pageviews only (Google Analytics). File contents and calculator inputs are never sent to GA either.

Why does the calculator differ from my actual paystub?

Calculators are estimates based on official rates. Real paystubs vary with company-specific non-taxable items (meal allowance 200K KRW), company-side deductions (union dues, welfare fund), year-end adjustments, and April health-insurance reconciliation — typically within ±100K to 300K KRW. Each tool's "Sources" footer links to the law / rate gazette references.

Where can I convert iPhone HEIC files?

Use image → HEIC → JPG. Multi-page HEIC is auto-split, and 20+ batch processing shows a safety confirm. The output JPG also has EXIF GPS stripped.

Does it work on iPad and iPhone?

iOS Safari 15+ / iPadOS 15+ are fully supported. Camera-permission tools (QR scan, OCR) request permission, and if denied, you can upload images from the gallery instead. iCloud / Google Photos cloud picks may prompt re-selection if permissions expire.

What is the file size limit?

Defaults: 100MB for images and PDFs, 1GB for videos. Actual limits depend on device memory. Video tools pre-estimate memory and block via confirm if risky.

How is the site updated when laws or rates change?

Each tool's "Sources" footer lists the last verification date. We sweep all calculators every November (gazette season) and January (new fiscal year), and we update immediately on major changes (national pension hike, minimum wage). Change history is in About.

Found a bug or mis-calculation?

Email [email protected] with the source link, and we'll verify against the official page and update. Policy: tax / rate numbers are always sourced from the issuing agency directly — no blog or news quotes.

Sources — 15 government & public agencies

All calculator and tool numbers are verified directly from the official pages below, swept every November and January. Blog and news quotes are never used.

User data and files are never sent to external servers. The links above are external references for verifying numbers and laws (with nofollow noopener to separate SEO signal).

— Preview
Calculators Compound interest BMI Calorie / TDEE Loan Savings All →
Image HEIC → JPG Crop ID photo Compress Remove BG All →
PDF Merge PDF Split Edit PDF → image All →
Video Compress Trim Rotate To GIF Extract MP3 All →
Text Character counter All →
— Engineering & ops notes from the maker

A tech blog by the backend engineer who builds and runs these tools — the SEO, infrastructure, and performance lessons learned while building this very site.

Blog Google sandbox AWS cost Web performance Custom domain All posts →