Free calculators and tools for your website
Copy one snippet and paste it into your site, blog or page: the tool shows up ready to use and updates itself. Free, no sign-up and no ads inside the frame.
- ✓ Free, no sign-up or API key
- ✓ Always up to date
- ✓ No ads and no cookies in the frame
- ✓ Works on phones and computers
See how it looks: Percentage Calculator
Calculators
- Unit Converter
Convert length, weight, temperature, area, volume, speed, time, pressure, energy and data - instantly, in your browser.
- Percentage Calculator
Percent of a number, percent change, discount price, and tip splitting - five common questions in one tool.
- Compound Interest Calculator
See how savings grow over time with regular contributions and compound interest.
- Loan Calculator
Estimate the monthly payment, total cost and total interest on a fixed-rate loan.
- Random Number Generator
Pick fair random numbers in any range, with an option for no repeats.
- Age Calculator
Work out an exact age in years, months and days, plus the countdown to the next birthday.
- BMI Calculator
Calculate Body Mass Index from height and weight, with the WHO category and a healthy-weight range.
- QR Code Generator
Turn any text or URL into a scannable QR code and download it as a PNG - instantly in your browser.
- LinkedIn Search URL Builder
Turn a target profile into a ready-to-open LinkedIn people-search link with the filters already applied.
- Currency Converter
Convert between 150+ currencies using up-to-date reference exchange rates.
- FGTS Calculator
Estimate your FGTS balance month by month, the termination fine and how much you can withdraw - with 13th salary, vacation, notice and fund correction.
- Fixed Income Calculator
Compare CDB, LCI/LCA, Tesouro Selic, fixed-rate, IPCA+ and savings side by side, net of income tax, with today's Banco Central rates.
- Net Salary Calculator
From gross to net pay with the 2026 INSS and income tax tables, including the new exemption up to R$ 5,000, dependents and common deductions.
- Termination Pay Calculator
What you receive when a job ends in Brazil: salary balance, notice, proportional 13th and vacation, INSS and income tax, FGTS fine and withdrawal.
- Vacation Pay Calculator
Vacation pay with the one-third bonus, sold days (abono pecuniário), 13th advance, INSS and income tax with the 2026 tables.
- 13th Salary Calculator
The Brazilian 13th salary by months worked, with the first instalment, INSS and income tax on the second, using the 2026 tables.
- Hours Calculator
Add up the hours you worked in the week from your clock-in times, with breaks, night shifts, overtime and pay per hour - or add and subtract any list of hours.
- Business Days Calculator
Count the working days between two dates or find the date N working days ahead, skipping weekends and Brazilian national holidays.
- Rule of Three Calculator
Solve any rule of three - direct or inverse - and see the calculation step by step, with ready-made examples.
- Simple Interest Calculator
Work out simple interest and the final amount - or find the rate, the capital or the term - with the formula step by step and a comparison with compound interest.
- Gestational Age Calculator
How many weeks pregnant am I? Gestational age, due date and the prenatal milestones - from the last period, an ultrasound or the conception date.
- Pix QR Code Generator
Create a Pix QR code and the copy-and-paste code for any key, with an optional amount and message - free, following the Banco Central standard.
- WhatsApp Link Generator
Create a WhatsApp link with your number and a ready-made message for your Instagram bio, site or ads - plus a QR code to print.
- Countdown Timer
A live countdown in days, hours, minutes and seconds to Christmas, New Year, Carnival or any date - with a link to share.
- Barbecue Calculator
Work out the meat per person by cut, plus beer, soft drinks, charcoal, ice and garlic bread - with a shopping list to copy or send by WhatsApp.
- Secret Santa Draw
Draw names for Secret Santa online, free and without sign-up: each person gets a private link that shows only who they drew.
- Calorie Calculator
Work out your basal metabolic rate and daily calories for your activity level, with targets to lose, keep or gain weight and how much water to drink.
- Menstrual Cycle Calculator
Find out when your next period is due, your fertile days and the estimated ovulation day, with the next six cycles on a calendar.
- Maternity Leave Calculator (Brazil)
Work out when maternity leave ends under Brazil's CLT (120 or 180 days), the return-to-work date with vacation, job stability and breastfeeding breaks.
- Quadratic Equation Solver
Solve ax² + bx + c = 0 with the quadratic formula: discriminant, real or complex roots, vertex, the steps and the graph of the parabola.
- GCD and LCM Calculator
Find the greatest common divisor and least common multiple of 2 to 10 numbers, with each number's prime factorization and Euclid's steps.
- Grade Average Calculator
Work out your simple or weighted grade average, whether it reaches the passing grade and the grade you need on the next test.
- Days Between Dates Calculator
Count the days between two dates in days, weeks and months with weekends shown, or add and subtract days from a date to see the resulting day.
- Pregnancy Weight Gain Calculator
See the recommended weight gain for your pre-pregnancy BMI, the range for your current week and where your gain sits, on a week-by-week chart.
- Cash or Installments Calculator
Find out whether a cash discount beats paying in instalments, counting what your money earns meanwhile, and see the interest hidden in the plan.
- Spin the Wheel
Type names or options, spin the wheel and get a fair random winner — for classes, giveaways, games and decisions. Free, no sign-up.
- Pomodoro Timer
A free Pomodoro timer: 25-minute focus blocks, short and long breaks, a soft sound at the end and today’s count of focus blocks. No sign-up.
Other tools
- Image Resizer & Compressor
Shrink one photo or a whole batch to a target width and quality without uploading them anywhere.
- Password Generator
Create long, random passwords in your browser - with a strength estimate and one-tap copy.
- Hash Generator
Get the SHA-1, SHA-256 and SHA-512 digest of any text, computed locally.
- Word & Character Counter
Live word, character, sentence and reading-time counts as you type.
- Base64 Encoder / Decoder
Convert text to Base64 and back, with full Unicode support, in your browser.
- Color Converter
Paste a colour in any common format and get HEX, RGB and HSL, with a live swatch.
- Text Case Converter
Convert text to UPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case and more.
- JSON Formatter & Validator
Pretty-print, minify and check JSON for errors - locally, nothing uploaded.
- URL Encoder / Decoder
Percent-encode text for safe use in URLs, or decode an encoded URL back to readable text.
- Lorem Ipsum Generator
Generate paragraphs, sentences or words of classic Lorem Ipsum filler text.
- UUID Generator
Generate random version-4 UUIDs (GUIDs), one or in bulk, instantly in your browser.
- Unix Timestamp Converter
Convert Unix time (epoch seconds or milliseconds) to a readable date, or a date to a timestamp, instantly in your browser.
- CPF Generator
Generate valid random CPF numbers with correct check digits, for testing forms and validation logic.
- CNPJ Generator
Generate valid random CNPJ numbers with correct check digits, for testing forms and validation logic.
- Test Credit Card Number Generator
Generate Luhn-valid fake card numbers, expiry dates and CVVs for testing payment forms.
- Fake Person Generator (Brazil)
Generate a complete fake Brazilian profile: name, CPF, RG, address, phone and email, for testing.
- GitHub Repository Finder
Find the top open-source projects for any topic and language, ranked by stars, forks or recent activity.
- Android Launcher Icon Generator
Turn text, an emoji or an image into a full set of Android launcher icons, ready to drop into your project.
- Icon Library and Downloader
Search hundreds of thousands of open-source icons, recolour them and download SVG or PNG.
- Background Remover
Remove any photo background automatically with AI and download a transparent PNG - no upload, no sign-up.
- Photo Enhancer
Fix exposure and colour, sharpen, or one-click auto-enhance a photo - all in your browser.
- Photo Collage Maker
Drop a few photos into a grid, set the spacing and shape, and download the collage as a PNG.
- WhatsApp Sticker Maker
Turn any photo into a WhatsApp sticker: the AI cuts out the subject, you add an outline and a caption, and download a 512 × 512 WebP - free and private.
- Meme Generator
Make a meme from your own photo in seconds - classic top and bottom text or a caption above the image - and download it as JPG or PNG.
- Fancy Text Generator
Type once and get your text in 16 styles - bold, italic, cursive, gothic, bubbles, upside down… - ready to copy into Instagram, WhatsApp or TikTok.
- Emoji Copy and Paste
All the emojis in one place: search by name in your language, browse by category and click to copy - or build a whole sequence and copy it at once.
- Merge PDF
Join several PDFs into one in the order you choose - free, no sign-up and without uploading your files.
- Images to PDF
Turn photos, scans and screenshots into a single PDF - one page per image, A4, Letter or original size - without uploading anything.
- Split PDF
Take only the pages you need from a PDF, or split it into one PDF per page - free, private and in your browser.
- Compress PDF
Shrink a PDF to send it by email or upload it to a form — free, private and in your browser.
- PDF to Image (JPG/PNG)
Turn every page of a PDF into a JPG or PNG image, up to 300 dpi - free, without sign-up and without uploading the file.
- Image to Text (OCR)
Copy the text of a photo, scanned document or screenshot in English, Portuguese or Spanish - free, and the image never leaves your device.
- Video Converter
Convert videos between MP4, WebM, MOV and MKV in your browser - free, no sign-up and without uploading the file.
- Audio Converter
Convert audio - or the sound of a video - to MP3, M4A, WAV, OGG, FLAC or AAC in your browser, free and without uploading it.
- Extract Audio from Video
Save the sound of any video as MP3, M4A or WAV - free, no sign-up and without uploading the video.
- Remove Audio from Video
Take the sound out of a video and keep the picture - free, no sign-up and without uploading it.
- Emoji Downloader
Pick one emoji, a whole category or everything you search and download them as PNG (72-512 px) or SVG in one ZIP.
- Emoji Maker
Build a custom emoji from eyes, mouths, colours and accessories and download it as PNG or SVG - free, no sign-up.
- AI Image Generator
Describe a picture, pick a style and format, and open a ready-to-run prompt in Bing Image Creator or ChatGPT - free.
- Printable Activities for Kids
Make free printable worksheets for children in seconds: maths with an answer key, handwriting practice, an illustrated alphabet, counting and language flashcards — as an A4 PDF.
- Text Compare
Paste two versions of a text and see exactly what was added and removed, word by word or line by line, with how similar they are - nothing is uploaded.
- Password Strength Checker
See how strong a password really is, how long it would take to guess in three attack scenarios and what to change - checked in your browser, never sent.
- Typing Speed Test
Type a short text for 30 seconds, 1 or 2 minutes and see your speed in words per minute, your accuracy and your level. Free, no sign-up.
Frequently asked questions
- How much does it cost?
- Nothing. The tools are free and stay free on your site. We only ask you to keep the credit link under the frame.
- Do I need to sign up or ask for permission?
- No. Copy the code and paste it into your site editor (in WordPress, use a "Custom HTML" block).
- Can I change the size?
- Yes: edit height (in pixels) and max-width in the code. The tool adapts to the available width.
- What happens when a tool is updated?
- It is updated on our site and the frame on yours shows the new version automatically.
- Does the tool collect data about my visitors?
- No. Calculations run in the visitor’s browser and nothing they type is sent. The frame sets no cookies; we only count anonymous, aggregate uses.