24 tools · nothing uploaded · works offlineEvery tool you need.
Every tool you need.
None of your data leaves the page.
24 free calculators, converters and document generators that run 100% in your browser. No sign-up, no watermarks — turn off your Wi-Fi and they still work.
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- generate invoice.pdfon device
- compress holiday-photo.jpgon device
- reverse-VAT a receipton device
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Private by design
Your files and numbers are processed in your browser and never uploaded — you can watch the network tab stay empty.
Free, no sign-up
Every tool is free, with no account, no watermark and no limits. No ads or upsells on your work.
Instant & offline
Everything runs locally, so results are instant — and keep working after you turn your Wi-Fi off.
Most popular
The tools people reach for first.
- Invoice GeneratorFree invoice generator: create and download a professional PDF invoice with no signup and no watermark. It runs entirely in your browser — nothing is uploaded.
- Freelance Rate CalculatorWork out the hourly rate you must charge as a freelancer — factoring unpaid time off, self-employment tax and real billable hours, not just salary ÷ 2080.
- Loan Calculator (EMI)Free loan calculator with monthly payment (EMI), total interest and a full amortization schedule. Accurate bank formula, in your browser.
- Currency ConverterConvert between world currencies using daily exchange rates. Free, fast and private — only public rates are fetched, never your data.
- Compound Interest CalculatorCalculate compound interest and investment growth with monthly contributions. Free, accurate, and it runs entirely in your browser.
- Markup, Margin & VAT CalculatorFree markup, margin and reverse-VAT calculator: turn cost into selling price, convert markup to margin, and add or remove VAT — instantly, in your browser.
Calculators
View all →- Compound Interest CalculatorCalculate compound interest and investment growth with monthly contributions. Free, accurate, and it runs entirely in your browser.
- Salary to Hourly CalculatorConvert an annual salary to an hourly wage and back, with weekly and monthly breakdowns. Free and private — it all runs in your browser.
- Percentage CalculatorFree percentage calculator: find X% of a number, what percent X is of Y, percentage change and discounts — instant results in your browser.
- Age CalculatorFree age calculator: get your exact age in years, months and days, or the number of days between any two dates. Runs entirely in your browser.
- Loan Calculator (EMI)Free loan calculator with monthly payment (EMI), total interest and a full amortization schedule. Accurate bank formula, in your browser.
- Mortgage CalculatorFree mortgage calculator: monthly payment from home price, down payment, rate and term, plus total interest. Runs entirely in your browser.
- Freelance Rate CalculatorWork out the hourly rate you must charge as a freelancer — factoring unpaid time off, self-employment tax and real billable hours, not just salary ÷ 2080.
- Markup, Margin & VAT CalculatorFree markup, margin and reverse-VAT calculator: turn cost into selling price, convert markup to margin, and add or remove VAT — instantly, in your browser.
Converters
View all →- Unit ConverterFree online unit converter for length, weight, temperature, area and speed. Instant, accurate results that run entirely in your browser.
- Currency ConverterConvert between world currencies using daily exchange rates. Free, fast and private — only public rates are fetched, never your data.
- Merge PDF FilesCombine multiple PDF files into one, free and without uploading — merging happens entirely in your browser, so your documents stay private.
- JPG to PNG ConverterConvert JPG to PNG and PNG to JPG online, free. Conversion happens in your browser — your image is never uploaded to a server.
- HEIC to JPG ConverterConvert HEIC iPhone photos to JPG online, free. Runs entirely in your browser — your photos are never uploaded to any server.
- Image CompressorCompress and resize JPG, PNG and WebP images in bulk, free. Runs in your browser — set a max size and dimension; nothing is uploaded.
Text tools
View all →Developer tools
View all →- JSON Formatter & ValidatorFormat, beautify, validate and minify JSON online. Clear error messages with line and column — fast, free, and fully in your browser.
- JWT DecoderDecode a JSON Web Token to read its header and payload. Runs entirely in your browser — your token is never uploaded or logged.
- CSV to JSON ConverterConvert CSV to JSON and JSON to CSV online. Handles quoted fields and headers correctly, entirely in your browser — no upload.
- Unix Timestamp ConverterConvert Unix timestamps to human dates and dates back to epoch seconds. Handles seconds and milliseconds, in UTC and your local time.
- HTML Entity Encoder & DecoderEncode text to HTML entities or decode entities back to text. Escapes <, >, &, quotes and non-ASCII — runs entirely in your browser.
- Regex TesterTest regular expressions against your text with live match highlighting, capture groups and flags. Free and fully in your browser.
Generators
View all →- Password GeneratorGenerate strong, random passwords with a cryptographically secure generator. Choose length and character sets — nothing leaves your browser.
- UUID GeneratorGenerate random version-4 UUIDs in bulk with a cryptographically secure generator. Copy individually or all at once — nothing leaves your browser.
- Invoice GeneratorFree invoice generator: create and download a professional PDF invoice with no signup and no watermark. It runs entirely in your browser — nothing is uploaded.