1. Reefsight
2. Free tools

Free tools

Create, calculate and manage data with free tools from Reefsight

• Pick colors from an image

  Tap a color in an image or on your screen, then copy HEX, RGB, HSL and the main palette as CSS. Full-screen mode included. Images are not uploaded. Picking from the screen needs a supported browser.

• PDF to Markdown

  Convert the text in a PDF to Markdown instantly. Your file is not kept on our server. Works with PDFs that have selectable text, such as those from Word or Google Docs.

• ReefLink

  Shorten links on reefsight.tech with a QR code and click counts.

• Thai text tools

  Thai word breaking and counting, Thai numerals, Buddhist and Gregorian dates, baht amounts in words, ID number checks, Thai names in English (RTGS) and Thai lorem ipsum.

• Compare Thai fonts

  Type one sentence and see all 34 Thai fonts on Google Fonts at once. Filter looped or loopless, adjust size and weight, and copy the CSS.

• Thai address lookup

  Provinces, districts, subdistricts and postal codes in three linked dropdowns, with search and a full download.

• Thai government and bank holidays

  A holiday calendar split by government and bank, a working-day counter and an .ics feed to subscribe to.

• Thai VAT and withholding tax calculator

  Enter the amount before VAT, with VAT or the net you want, and get 7% VAT, withholding tax and the transfer amount, with the amount in Thai words.

• Quotations, invoices and receipts

  Fill in the company, customer and items to get an A4 quotation, invoice or receipt with VAT, discounts, withholding tax and the amount in words. Save as PDF. Your data stays on your device.

• Car and home loan calculator

  Monthly payments, total interest, a repayment schedule, and flat interest converted to the effective reducing rate you really pay.

• Severance and overtime pay

  Severance under Section 118, payment in lieu of notice, unused annual leave, and overtime at 1.5×, holiday pay and holiday overtime at 3× under Thai labour law.

• Age, date and working-day calculator

  Age in years, months and days and the weekday you were born, days between dates, and working days excluding government or bank holidays.

• Net salary and social security

  Enter your salary to see what reaches your account, after social security with the new 2026 ceiling, provident fund and monthly withholding tax.

• Thai personal income tax

  Enter your salary, bonus and allowances to get the year's tax by bracket and whether you get a refund or owe more. Tax years 2025 and 2026.

• Thai annual car tax

  Enter the engine size and registration date to get the annual car tax by cc band, the discount for cars over 5 years old and the surcharge for paying late.

• Thai electricity bill calculator

  Enter the units used to get a home electricity bill at the new September 2026 rates, with the service charge, Ft and VAT broken down.

• Thai property transfer costs

  Enter the sale price, appraised price and acquisition date to get the transfer fee, mortgage fee, specific business tax or stamp duty and withholding tax, and who pays each.

• Thai land unit converter

  Convert rai, ngan and square wah to square metres, square feet and acres and back. Accepts title-deed style 2-1-50, and works out prices per wah or per rai.

• Split the bill

  Split a meal equally or by item, adding 10% service charge and 7% VAT the way restaurants do, with a PromptPay QR for each person.

• Savings interest calculator

  A lump sum or monthly savings with interest compounded yearly, including 15% tax and the exemptions for 20,000 baht of savings interest and for fixed deposits.

• Percentage calculator

  X% of a number, what percent one number is of another, percent increase or decrease, and the price after discount, including stacked discounts, with the formula.

• PromptPay QR

  Create a PromptPay QR to receive money from a phone or ID number, and decode existing QR codes. Nothing is stored.

• QR code generator

  QR codes for links, Wi-Fi, LINE, contact cards and more. Add color, a logo and text, then download PNG or SVG. They never expire and have no watermark.

• Thai bank slip QR reader

  Paste a transfer slip image to read the small QR code and extract the sending bank and reference number, with a CRC check. Images are not uploaded.

• Spin the wheel

  Add your options and spin for a fair random pick. Remove results that came up, keep a history and share a link with friends.

• Tier list maker

  Rank things S, A, B, C and D with text or images. Drag and drop or tap to pick a row, then save a PNG or share a link.