30 fast, private tools that run in your browser
Calculators, text utilities, image editors, PDF tools and document generators. Your files and text never leave your device — and there is nothing to sign up for.
Browse by category
Calculators
9 tools
Nine everyday calculators for percentages, loans, mortgages, compound interest, pay, ages, dates, BMI and calories — each one shows its full working.
Includes Percentage, Loan, Mortgage
Browse Calculators
Text & Developer Tools
6 tools
Generate QR codes, strong passwords and UUIDs, and count words, characters and reading time. Everything runs locally in your browser.
Includes QR Code, Password, UUID
Browse Text & Dev
Image Tools
7 tools
Compress, resize, crop and convert JPG, PNG and WebP images in your browser. Files are processed on your device and never uploaded.
Includes Image Compressor, JPG Compressor, PNG Compressor
Browse Images
PDF Tools
6 tools
Merge, split, compress and convert PDF files entirely in your browser. Page sizes and rotation are preserved, and your documents are never uploaded.
Includes Image to PDF, PDF to JPG, JPG to PDF
Browse PDF
Business Tools
2 tools
Create professional invoices and receipts in your browser, with exact currency maths and print or PDF output. No account required.
Includes Invoice, Receipt
Browse Business
Popular tools
A hand-picked cross-section rather than a traffic ranking — one or two from each part of the site, so you can see what is here.
Percentage Calculator
Calculators
Work out a percentage of a number, what percentage one number is of another, or the percentage change between two values. Shows every step.
Open tool
Loan Calculator
Calculators
Calculate a fixed-rate loan payment, total interest and full amortisation schedule. Add an extra monthly payment to see how much sooner it clears.
Open tool
Salary Calculator
Calculators
Convert pay between hourly, daily, weekly, biweekly, semimonthly, monthly and annual rates using your own hours and paid weeks. Gross pay only.
Open tool
Age Calculator
Calculators
Find an exact age in years, months and days from any birth date, plus total weeks and days lived, the day of the week born and the next birthday.
Open tool
QR Code Generator
Text & Dev
Create QR codes for links, text, email, phone, SMS and Wi-Fi networks. Download as PNG or SVG. Encoding happens in your browser, not on a server.
Open tool
Password Generator
Text & Dev
Generate strong random passwords from 8 to 128 characters using your browser cryptographic random source. Nothing is stored, logged or transmitted.
Open tool
Word Counter
Text & Dev
Count words, sentences and paragraphs as you type, with reading time, speaking time and the most frequent keywords in your text.
Open tool
Image Compressor
Images
Compress JPG, PNG and WebP images in your browser. Adjust quality, cap dimensions and download one file or a ZIP. Nothing is uploaded to a server.
Open tool
PDF Merger
PDF
Combine up to ten PDFs into one document in any order you like. Pages are copied, not re-rendered, so text stays selectable and page sizes stay exact.
Open tool
Invoice Generator
Business
Build a professional invoice with line items, discounts, tax and payment terms, then print it or download a PDF. No account, no data sent anywhere.
Open tool
Why the tools work this way
Your files stay on your device
Images, PDFs and text are processed by your own browser. There is no upload endpoint in this product, so there is nothing to leak, retain or delete.
No signup, no queue, no watermark
Every tool works immediately. Nothing is gated behind an account, a free-trial limit or a paid tier, and no output is stamped with a logo.
Honest about what it cannot do
Where a limit is real — PDF compression, image quality, BMI as a health measure — it is stated plainly on the page rather than hidden behind a marketing claim.
Recently reviewed
Tools whose calculations and written guidance were last checked. Review dates come from actual reviews, not from an automatic timestamp.
Age Calculator
Find an exact age in years, months and days from any birth date, plus total weeks and days lived, the day of the week born and the next birthday.
Open tool
BMI Calculator
Calculate body mass index in metric or US units, see the standard adult category and the healthy weight range for your height. Information only.
Open tool
Calorie Calculator
Estimate resting metabolic rate and daily calorie needs with the Mifflin-St Jeor equation, plus illustrative targets for gradual loss or gain.
Open tool
Case Converter
Convert text to lowercase, UPPERCASE, Sentence case, Title Case, camelCase, PascalCase, snake_case, kebab-case, CONSTANT_CASE or alternating case.
Open tool
What ToolNimbly is for
Most everyday utility tasks — working out a loan payment, shrinking a photo to fit an upload limit, merging two PDFs before sending them — do not need a server, an account or a subscription. Browsers have been able to do all of this locally for years. This site is built on that: the tool code runs in your tab, your data stays with you, and the page loads fast because there is no heavy application behind it.
Every tool page explains what the tool does, shows the formula or the processing steps it uses, works through a real example, and states its limitations. Where a calculation has a standard published method, that method is named and cited. Where a result should not be relied on — health estimates, financial projections, tax treatment — that is said next to the result rather than buried in the terms.
You can read more about how the site is built and tested on the about page, and exactly what is and is not collected in the privacy policy.