A full list of every tool on Toolzy, grouped by category. Each one runs in your browser — no sign-up and no uploads of your input by our tools.
Calculators & Converters 32
Everyday maths done for you: convert units, work out money, health and study numbers, and do date and time arithmetic.
- Percentage CalculatorPercent of a number, percent change, increase and decrease, reverse percent.
- Age CalculatorExact age in years, months and days, plus days until your next birthday.
- Days Between Dates CalculatorDays, weeks and weekdays between two dates, or add/subtract days from a date.
- GPA CalculatorSemester and cumulative GPA on the 4.0 scale, with honors/AP weighting.
- Tip CalculatorWork out the tip and split the bill between any number of people.
- Loan Payment CalculatorMonthly payment, total interest and yearly breakdown, with extra-payment savings.
- Length ConverterConvert cm to inches, feet to meters, miles to km and more.
- Weight ConverterConvert kg to pounds, ounces to grams, stone and more.
- Temperature ConverterConvert Celsius, Fahrenheit, Kelvin and Rankine.
- Volume ConverterConvert cups, mL, liters, gallons, fluid ounces and spoons.
- Speed ConverterConvert mph, km/h, m/s, knots and ft/s.
- Data Storage ConverterConvert bytes, KB, MB, GB, TB and the binary KiB, MiB, GiB.
- Roman Numeral ConverterConvert numbers to Roman numerals and back, from 1 to 3999.
- Compound Interest CalculatorSee how savings grow with compounding and monthly deposits.
- Discount CalculatorFind the sale price, savings, or percent off. Stack two discounts.
- Sales Tax CalculatorAdd sales tax / VAT to a price, or take it out of a total.
- Hourly to Salary CalculatorConvert hourly pay to annual salary, or salary to an hourly rate.
- Debt Payoff CalculatorCompare snowball and avalanche plans and see your debt-free date.
- BMI CalculatorBody mass index, category and healthy weight range, metric or imperial.
- TDEE & Calorie CalculatorEstimate BMR and daily maintenance calories for weight loss or gain.
- Running Pace CalculatorWork out pace per km and mile, or the finish time for a pace.
- Final Grade CalculatorSee what score you need on your final exam to reach a target grade.
- Add Days to Date CalculatorAdd or subtract days, weeks, months or years from any date.
- Working Days CalculatorCount Monday–Friday working days between two dates, minus holidays.
- Time Zone ConverterConvert a date and time between world time zones with DST handled.
- Pomodoro TimerA simple focus timer: 25-minute sessions with short and long breaks.
- Random Number GeneratorGenerate random whole numbers or decimals in any range, with or without repeats.
- Random Name PickerPick random winners from a list, shuffle it, flip a coin or roll dice.
- Unit Price Comparison CalculatorCompare pack sizes to find the cheapest price per kg, litre or item.
- EMI CalculatorMonthly EMI, total interest and a yearly schedule for any loan.
- Countdown TimerCount down minutes or to a date and time, with an alarm sound.
- Online Stopwatch with LapsPrecise stopwatch with lap and split times and keyboard shortcuts.
Text Tools 14
Count, clean, compare, convert and generate text without uploading it anywhere.
- Word CounterCount words, characters, sentences and paragraphs, plus reading time.
- Case ConverterUPPERCASE, lowercase, Title Case, Sentence case, camelCase, snake_case and more.
- Reading Time CalculatorEstimate how long an article or script takes to read, with image time and custom speed.
- Remove Duplicate LinesDelete repeated lines from a list, with trim, case and sort options.
- URL Slug GeneratorTurn a title into a clean, SEO-friendly URL slug.
- Character CounterCount characters with and without spaces, bytes, and check common limits.
- Sort Lines AlphabeticallySort a list A–Z, Z–A, by number or length, or shuffle it; remove blanks and duplicates.
- Morse Code TranslatorTranslate text to Morse code and decode Morse back to text.
- Lorem Ipsum GeneratorGenerate lorem ipsum paragraphs, sentences or words as placeholder text.
- Text Diff CheckerCompare two texts and highlight additions and deletions by line, word or character.
- Markdown to HTML ConverterConvert Markdown to clean HTML with a live preview.
- Markdown Table GeneratorPaste spreadsheet or CSV data and get a Markdown table.
- Word Frequency CounterFind the most frequent words and phrases in any text.
- Typing Speed Test (WPM)Measure your typing speed in WPM and your accuracy.
Developer Tools 14
Format, encode, decode, hash and test, with nothing sent to a server. Safe to use on real tokens and payloads.
- Password GeneratorCreate strong random passwords with the browser’s secure random generator.
- JSON Formatter & ValidatorFormat, minify and validate JSON with clear error positions.
- JSON to CSV ConverterTurn a JSON array of objects into CSV for Excel or Google Sheets.
- Base64 Encode & DecodeEncode text to Base64 or decode Base64 back to text (UTF-8 safe).
- URL Encode & DecodePercent-encode or decode URLs and query-string values.
- JWT DecoderDecode a JSON Web Token locally and check its expiry.
- SHA-256 Hash GeneratorHash text or a file with SHA-256, SHA-1, SHA-384 or SHA-512.
- Binary, Decimal & Hex ConverterConvert numbers between binary, octal, decimal and hex; text to binary.
- Regex TesterTest JavaScript regular expressions with live match highlighting.
- Cron Expression GeneratorBuild a cron expression, read it in plain English and preview next runs.
- Unix Timestamp ConverterConvert Unix/epoch timestamps to dates and dates to timestamps.
- UUID GeneratorGenerate random version 4 UUIDs (GUIDs), one or hundreds at a time.
- HTML, CSS & JS Live PreviewWrite HTML, CSS and JavaScript and see the result live, sandboxed.
- Bulk URL Opener & Link ExtractorExtract every link from text or HTML and open them in batches.
Image & Design Tools 12
Compress, resize and convert pictures, make QR codes and work with colors. Your files never leave your device.
- Image CompressorShrink JPG, PNG and WebP images in your browser. No upload.
- Image ResizerResize images to exact pixels or social-media sizes, with crop-to-fill.
- Image Format ConverterConvert images between PNG, JPG and WebP in your browser.
- QR Code GeneratorMake a QR code for a link or text. Download as PNG or SVG.
- Color Converter (HEX, RGB, HSL)Convert colors between HEX, RGB, HSL and CMYK with a picker.
- Color Contrast CheckerCheck WCAG contrast ratio between text and background colors.
- Aspect Ratio CalculatorFind the aspect ratio of a size, or scale a size to keep the ratio.
- Color Palette ExtractorPull the main colors out of an image as a HEX palette.
- Signature MakerDraw or type your signature and download a transparent PNG.
- Meme Generator & Text on ImageAdd bold top and bottom captions to any picture.
- Favicon GeneratorCreate favicon.ico, PNG icons and a manifest from an image or text.
- Barcode GeneratorMake Code 128, EAN-13 and EAN-8 barcodes as PNG or SVG.
PDF & Document Tools 10
Merge, split, view, convert and compress PDFs, and create invoices and resumes as PDF, without uploading your documents.
- Image to PDF ConverterTurn JPG, PNG and WebP images into one PDF, in any order.
- Merge PDFCombine several PDF files into one, in the order you choose.
- Split PDF & Extract PagesExtract page ranges or split a PDF into single pages or chunks.
- Compress PDFMake a PDF smaller, losslessly or by turning pages into images.
- PDF to JPG / PNG ConverterSave PDF pages as JPG or PNG images at the resolution you need.
- PDF Viewer & ReaderOpen and read PDF files in the browser, with zoom and page navigation.
- Text to PDF ConverterTurn plain text into a neat, paginated PDF document.
- Invoice GeneratorCreate a professional PDF invoice with tax, discount and totals.
- Resume / CV BuilderBuild a clean, ATS-friendly resume or CV and download it as PDF.
- Citation Generator (APA & MLA)Format APA 7 and MLA 9 citations for books, articles and websites.
Browser AI & Simulations 5
Small, honest AI experiments that run on your device: train, teach, play and explore how machines learn.
- Neural Network PlaygroundTrain a small neural network in your browser and watch it learn.
- Gesture Predictor (Teach the AI)Draw swipes and shapes; the AI learns from your examples and predicts live.
- Fly Brain Simulator (Toy Model)A tiny spiking-neuron "fly" learns to steer toward food by reward.
- Connect Four & Tic-Tac-Toe vs AIPlay Connect Four or Tic-Tac-Toe against a minimax AI.
- Hugging Face Trends DashboardLive trending, most downloaded and newest AI models and Spaces on Hugging Face.