All Tools - PrimeFreeTools

Every tool below runs 100% in your browser. Pick a category, or type to find a tool instantly.

Calculators 84

Invoice Tax Breakdown Calculator, Split any invoice into subtotal, tax, and total, per line item.
Compound Interest & Loan Amortization Calculator, See compound growth or a full loan amortization schedule.
Aspect Ratio Calculator, Find the matching dimensions for any aspect ratio.
Global Time Zone Meeting Planner, Schedule meetings across time zones with one glance.
Blog Reading Time Estimator, How long does it take to read this?
Tip & Bill Splitter Calculator, Split the bill and tip fairly between friends.
Salary ↔ Hourly Wage Converter, Compare salaried and hourly pay.
Retail Discount & Markup Pricing Calculator, Nail pricing with discounts and markups.
Compound Inflation Purchasing Power Calculator, What will money be worth in the future?
Percentage Increase / Decrease Calculator, Perfect percentage math, instantly.
Fuel Cost & Trip Mileage Calculator, Price out a road trip before you leave.
BMI & Daily Calorie Intake Calculator, Track BMI and daily calorie needs.
Daily Water Intake Calculator, How much water should you drink?
Age Calculator, Your exact age in years, days, hours, and minutes.
Date-to-Date Duration Calculator, Exact days, weeks, and months between two dates.
Add/Subtract Days From Date Tool, Jump forward or back to a future or past date.
Business / Working Days Calculator, Count Monday-to-Friday working days only.
Countdown Timer Generator, Ticking countdown to a launch or event.
Stopwatch & Lap Timer, High-precision browser stopwatch with lap splits.
Random Number Generator (Range), Crypto-random numbers between custom bounds.
Even/Odd Number Filter, Split a list of digits into evens and odds.
Fraction-to-Decimal Converter, Turn fractions into clean decimals, instantly.
GCD & LCM Calculator, Greatest Common Divisor and Least Common Multiple.
Quadratic Equation Solver, Solve ax² + bx + c = 0 with steps.
Pythagorean Theorem Calculator, Solve right-triangle side lengths with a² + b² = c².
Circle Area & Circumference Calculator, Area, circumference, radius, and diameter from one input.
Triangle Area Calculator, Area via base/height or three sides (Heron’s formula).
Matrix Addition & Multiplication Tool, Add and multiply matrices client-side.
Roman Numeral ↔ Arabic Converter, Translate XLII to 42 and back.
Simple Interest Calculator, Principal, rate, and time interest in seconds.
Unit Price Comparison Calculator, Compare price per gram, ml, oz, or item.
Recipe Scale & Portion Converter, Scale ingredients up or down by servings.
Paint Coverage & Wall Area Calculator, Estimate paint cans from wall size.
Tile & Grout Calculator, Tiles, boxes, adhesive, and grout needed.
Concrete, Gravel & Mulch Calculator, Volume or bags by area and depth.
Wallpaper Roll Estimator, Rolls needed with pattern repeat.
Flooring & Carpet Area Calculator, Square feet/metres with waste allowance.
Sleep Cycle Bedtime Calculator, Best bedtime or wake time.
Running Pace & Split Calculator, Pace, time, and distance splits.
Heart Rate Zone Calculator, Training zones from age and resting HR.
One-Rep Max & Plate Loader, Estimate 1RM and plates per side.
Macro & Protein Split Calculator, Calories into protein/carbs/fat.
Body Fat Estimate (Tape Method), Simple circumference-based estimate.
Ideal Weight Range Calculator, Healthy weight range by height.
Steps to Calories Calculator, Steps to estimated calories burned.
Electricity Cost Calculator, Watts x hours x electricity rate.
EV Charging Cost Calculator, Battery size, range, and rate.
Solar Payback Estimator, Simple payback by usage and rate.
Carbon Footprint Quick Estimator, Travel, home, and diet estimate.
Debt Payoff Snowball Calculator, Order debts by balance.
Savings Goal Timeline Calculator, Monthly saving needed for a goal.
Budget 50/30/20 Splitter, Needs, wants, savings.
Rent Affordability Calculator, Income to rent range.
Overtime & Shift Pay Calculator, Regular, overtime, and differential.
Commission & Bonus Calculator, Base pay plus commission tiers.
Freelance Rate Calculator, Desired income to hourly rate.
Meeting Cost Calculator, Attendees x time x hourly rate.
Coffee Brew Ratio Calculator, Grams coffee to water.
Pizza Dough Calculator, Dough by number, size, and style.
Sourdough Hydration Calculator, Flour, water, and starter ratios.
Cocktail Dilution & Batch Calculator, Scale drinks and ice melt.
BBQ Meat Quantity Calculator, Pounds by guests and sides.
Party Food & Drink Estimator, Quantities per guest.
Pet Age Calculator, Dog/cat years to human years.
Pet Food Portion Calculator, Calories by weight and activity.
Pregnancy Due Date Calculator, LMP or conception date.
Ovulation Window Estimator, Cycle-based estimate.
Baby Feeding Amount Calculator, Formula/breast milk by weight and age.
Child Height Predictor, Estimate from parent heights.
Scientific Notation Converter, Decimal to scientific notation.
Significant Figures Counter & Rounder, Count and round sig figs.
Mean, Median, Mode & Range Calculator, Basic stats instantly.
Standard Deviation & Variance Calculator, Population or sample.
Z-Score & Percentile Calculator, Standard score to percentile.
Combination & Permutation Calculator, nCr and nPr.
Prime Factorization Calculator, Factor any integer.
Fibonacci Sequence Generator, Generate sequence by length.
Dice Probability Calculator, Odds for dice outcomes.
Poker Hand Odds Calculator, Simple pre-flop odds.
Lottery Odds Calculator, Odds by number picks.
Julian Date Converter, Calendar date to Julian day.
Week Number Calculator, ISO week number for any date.
Moon Phase Calculator, Phase for a given date.
Sunrise/Sunset Calculator, By date and location.

Converters 38

JSON ↔ CSV Converter, Convert JSON arrays to CSV and back, right in your browser.
Base64 Encoder & Decoder, Encode or decode Base64 text instantly.
MD5 and SHA Hash Generator, Generate MD5, SHA-1, SHA-256, and SHA-512 hashes.
HTML Entity Encoder & Decoder, Escape HTML or decode entities with one click.
Kitchen & Cooking Unit Volume Converter, Cups, ml, tbsp, tsp: convert like a chef.
Oven Temperature Converter (°C, °F, Gas Mark), No more guessing oven settings across recipes.
Morse Code Translator & Audio Player, Encode text as Morse, decode Morse, hear it play.
Binary, Hexadecimal & Decimal Converter, Convert between bin, hex, dec, and oct.
Epoch Unix Timestamp Converter, Convert Unix timestamps to dates and back.
Binary-to-Text Translator, Turn 01010100 strings back into readable text.
Text-to-Binary Translator, Encode any text as raw binary code.
Hex-to-Text Converter, Translate hex codes into plain human text.
Text-to-Hex Converter, Encode regular text as hexadecimal.
ASCII Code Lookup Table, Searchable reference for character code numbers.
URL Encoder / Decoder, Escape or unescape special characters for URLs.
Data Storage Unit Converter, Bytes, KB, MB, GB, TB in one click.
Speed Unit Converter, mph, km/h, knots, and m/s, converted.
Pressure Unit Converter, PSI, Pascal, Bar, and Atmosphere.
Energy & Power Converter, Joules, calories, kWh, and horsepower.
Frequency Unit Converter, Hz, kHz, MHz, and GHz.
Angle Unit Converter, Degrees, radians, and gradians.
Volume / Liquid Converter, Gallons, quarts, pints, cups, liters, and more.
Weight & Mass Converter, kg, pounds, grams, ounces, and stones.
Length & Distance Converter, Meters, feet, inches, yards, miles, kilometers.
Temperature Converter, Celsius, Fahrenheit, and Kelvin.
Time Unit Converter, Seconds, minutes, hours, days, weeks, years.
Force Unit Converter, Newtons, pound-force, and dyne.
Shoe Size Converter, US/EU/UK/CM.
Ring Size Converter, Circumference to ring size.
Clothing Size Converter, International size equivalents.
Base32 Encoder / Decoder, Base32 text conversion.
HEX to RGB to HSL Converter, Color format conversion.
CMYK to RGB Converter, Print to screen color.
PX to REM/EM Converter, CSS unit conversion.
Viewport Unit Converter, px to vw/vh.
Color Name Finder, Closest named color.
File to Base64, Any small file to Base64.
Unicode Escape / Unescape, uXXXX conversion.

Formatters 2

URL Slug Generator & Text Cleaner, Turn any text into a clean, SEO-friendly URL slug.
Multi-Case Text Converter, camelCase, snake_case, kebab-case, Title Case and more.

Developer Tools 76

Meta Tag Previewer (Google & Twitter), Preview how your page appears in Google and social cards.
Cron Expression Parser & Explainer, Decode any cron schedule into plain English.
HTML/CSS Color Picker & Contrast Checker, Pick colors and verify WCAG contrast ratios.
CSS Box-Shadow Generator, Design CSS box shadows with live preview.
CSS Border-Radius Visualizer, Craft wobbly and organic border radii visually.
Regex Tester & Visual Matcher, Test and visualize regular expressions live.
PEM Certificate & RSA Key Decoder, Inspect certs and keys without leaving the browser.
IP Address Lookup & Network Detail, Analyze an IP address or CIDR range.
DNS Lookup & Propagation Checker, Resolve DNS records for any host.
SSL Certificate Expiration Checker, How many days until a cert expires?
HTTP Headers Inspection Tool, See the response headers any URL returns.
Password Entropy Meter & Brute-Force Estimator, Just how strong is that password?
Speed Test / Ping Simulation Widget, Measure latency with a lightweight ping-style check.
HTML to Markdown Converter, Convert HTML tags into clean Markdown syntax.
Markdown to HTML Converter, Compile Markdown into production-ready HTML.
CSS Minifier, Shrink stylesheets by stripping whitespace.
CSS Beautifier / Formatter, Indent and clean up messy CSS.
JavaScript Minifier, Compress scripts to speed up page loads.
JavaScript Beautifier, Restructure unformatted JS into readable style.
JSON Validator & Linter, Check syntax and flag broken brackets or commas.
XML-to-JSON Converter, Transform legacy XML structures into JSON.
YAML-to-JSON Converter, Convert configuration syntax instantly.
SQL Query Formatter, Clean up messy database queries.
SQL Insert to CSV Exporter, Turn SQL INSERT statements into CSV tables.
HTAccess Redirect Generator, Write clean 301/302 rewrite rules.
Robots.txt Generator, Build search-engine crawl rules blocks.
Sitemap XML Structure Builder, Generate sitemap.xml templates for your site.
Meta Description Length Checker, Measure snippet pixel width and character count.
Placeholder Image Generator, Make /600×400 placeholder boxes for wireframes.
CSS Triangle Generator, Border-code speech bubbles and arrows.
CSS Flexbox Playground & Generator, Experiment with flexbox alignments visually.
JSON Tree Visualizer, Render nested JSON as an expandable tree.
Browser User-Agent Inspector, See the live browser string and OS of the visitor.
Screen Resolution & Viewport Tester, Live window dimensions and aspect ratio.
JSON to YAML Converter, JSON to clean YAML.
XML Beautifier / Formatter, Pretty-print XML.
YAML Validator / Formatter, Check and clean YAML.
TOML to JSON Converter, Config format conversion.
INI to JSON Converter, Legacy config conversion.
.env Parser & Validator, Inspect environment files.
SQL WHERE Clause Builder, Build conditions visually.
Code Screenshot Generator, Styled code images.
JSON Path Extractor, Pull values by JSONPath.
JSON Schema Generator, Infer schema from JSON.
JSON to TypeScript Interface, Types from JSON.
JSON to Go Struct, Go structs from JSON.
JSON to Python Dataclass, Python classes from JSON.
JSON to SQL Insert, JSON arrays to INSERT statements.
HTML Table to CSV, Scrape table to CSV.
HTML Table to Markdown, Table to Markdown.
HTML to JSX Converter, Convert HTML attributes to JSX.
CRC32 Checksum Calculator, File/text checksum.
Data URI Generator, Text or file to data URI.
SVG to Data URI, Inline SVG as CSS background.
Manifest.json Generator, PWA manifest builder.
CSS Gradient Generator, Linear/radial gradients visually.
CSS Clip-Path Generator, Shape clipping preview.
CSS Grid Generator, Build grid layouts.
CSS Filter Generator, Blur, brightness, contrast, etc.
CSS Cubic-Bezier Generator, Animation easing curves.
CSS Text-Shadow Generator, Layered text shadows.
CSS Animation Keyframes Generator, Starter keyframes.
Font Pairing Previewer, Compare heading/body fonts.
Line Height & Typography Scale Calculator, Type scale.
Gradient Text Generator, CSS gradient text.
PDF Page Counter, Count PDF pages.
PDF to Text, Extract text from PDF.
UTM Campaign Link Builder, Track campaign URLs.
Query String Parser & Editor, Edit URL parameters.
URL Parser & Component Extractor, Protocol, host, path, query.
Open Graph Tag Generator, Social meta tags.
Schema.org JSON-LD Generator, Structured data.
Hreflang Tag Generator, Multilingual SEO tags.
RSS Feed Builder, Simple feed XML.
MIME Type Lookup, Extension to MIME type.
HTTP Status Code Lookup, Status code meanings.

Text Tools 33

Text Diff Checker, Spot the difference between two blocks of text.
SVG Path & Icon Cleaner, Minify and normalize SVG markup.
Text Line Sorter & Duplicate Remover, Sort lines and strip duplicates instantly.
Word Frequency & Keyword Counter, See which words dominate your text.
Reverse Text Generator, Reverse letters, words, or whole sentences in one click.
Upside-Down Text Generator, Flip regular text upside down for social media.
Vaporwave / Aesthetic Text Generator, Spread text out as spaced full-width characters.
Zalgo / Glitch Text Generator, Add chaotic combining marks to any text.
Strikethrough & Underline Text Generator, Draw lines through or under any text.
LeetSpeak ($33p$) Translator, Turn plain letters into hacker-style leetspeak.
Word-to-Number Converter, Turn written numbers like “four hundred” into digits.
Number-to-Words Converter, Write out any number for checks or legal documents.
Remove Line Breaks Tool, Flatten headings and carriage returns into one block.
Add Line Numbers Utility, Number every line of a text block.
Text Indent / Unindent Tool, Add or strip tabs and spaces across a block.
Remove Extra Spaces Tool, Kill double spaces, trailing spaces, and stray tabs.
ASCII Art Text Banner Generator, Turn names into big blocky ASCII banners.
Custom Delimiter Splitter, Split lists on commas, pipes, or any custom separator.
Find and Replace Text Tool, Bulk-swap keywords across large blocks of text.
Extract Email Addresses Tool, Pull clean email lists out of messy text.
Extract URLs & Links Tool, Pull every web link out of HTML or plain text.
Word/Character/Line Counter, Live counts with limits.
Readability Score Calculator, Flesch-Kincaid and grade level.
Syllable Counter, Syllables per word and total.
Markdown Table Generator, Build Markdown tables visually.
Markdown Checklist Generator, Task lists from plain text.
ROT13 / Caesar Cipher, Simple text encryption.
Vigenere Cipher, Keyword-based cipher.
A1Z26 Cipher, Letters to numbers and back.
NATO Phonetic Alphabet Converter, Text to Alpha Bravo Charlie.
Braille Translator, Text to Braille Unicode.
Pig Latin Translator, Fun text transformation.
Emoji Shortcode Converter, 🙂 to emoji.

Generators 11

Lorem Ipsum Dummy Text Generator, Generate placeholder copy for mockups and wireframes.
UUID v1 / v4 / v5 Generator Suite, Generate UUIDs in any version and quantity.
Random User Profile Generator, Fake names, addresses, and emails for mockups.
Pronounceable Password Generator, Easy-to-say passwords from phonetic syllables.
Dummy CSV File Downloader, Pre-formatted mock data for code testing.
Gitignore Generator, Templates by language/framework.
License Generator, MIT, Apache, GPL, etc.
README Template Generator, Starter README files.
ULID Generator, Sortable unique IDs.
NanoID Generator, Short random IDs.
Random Color Generator, Hex palettes.

Image Tools 17

PNG → JPG / WEBP In-Browser Converter, Convert images between PNG, JPG, and WEBP locally.
Image Color Palette Extractor (HEX), Pull a hex color palette out of any image.
Multi-Size Favicon Generator (.ico packs), Generate every favicon size you need.
Custom Brand Color QR Code Builder, Build QR codes in your brand colors.
Barcode Generator (EAN, UPC, Code 128), Generate EAN, UPC, and Code 128 barcodes.
Color Shade & Tint Generator, Lighter and darker variants of any HEX color.
Image Metadata (EXIF) Viewer, Inspect camera settings and GPS client-side.
Image Format Identifier, Reveal the true type from file headers.
Color Blindness Simulator, Preview palettes under CVD.
Image DPI / Print Size Calculator, Print dimensions from pixels.
Image PPI / Pixel Density Calculator, Pixels per inch.
Image File Size Estimator, Estimate compressed size.
Image to Base64, Embed images in HTML/CSS.
Base64 to Image, Decode Base64 images.
SVG to PNG Converter, Rasterize SVG locally.
WiFi QR Code Generator, Share Wi-Fi without typing.
vCard QR Code Generator, Contact card QR.

Fun & Games 10

Random Team & Raffle Name Picker, Fairly split names into teams or draw a raffle winner.
Coin Flip & Dice Rolling Simulator, Flip a coin or roll the dice.
Random Emoji Picker, Quick emoji choice.
Pomodoro Timer, Focus/break cycles.
Interval Timer, HIIT/custom intervals.
Metronome, Tap tempo and beats.
BPM Tap Tempo, Tap to find BPM.
Tone Generator, Sine/square/saw frequencies.
Piano Note Frequency Calculator, Note to Hz.
Music Transposer, Shift key and chords.

Security & Network 14

IPv4 Subnet Calculator, Network masks, wildcards, and host ranges.
MAC Address Vendor Lookup, Identify manufacturers from MAC prefixes.
Port Scanner Reference Guide, Interactive directory of common TCP/UDP ports.
Bcrypt Hash Generator, Hash strings for password handling tests.
JWT (JSON Web Token) Decoder, Split tokens into header, payload, and signature.
UUID Checker & Version Validator, Confirm an identifier fits standard UUID syntax.
Credit Card Number Mock Generator (Luhn), Valid test cards for sandbox checkouts.
IBAN Bank Account Validator, Check IBAN syntax and checksums per country.
ISBN Book Number Validator, Confirms ISBN-10 and ISBN-13 checksums.
HMAC Generator, HMAC with secret and hash.
VIN Decoder, Basic vehicle identification.
Phone Number Formatter / Validator, Normalize numbers.
Punycode / IDN Converter, International domain names.
Unicode Character Inspector, Codepoint, name, block.