127+ tools. Pick one. Get it done.

JSON Formatter

Format, validate & minify JSON in your browser

QR Code Generator

Create QR codes for URLs, text, WiFi or anything

Password Generator

Strong, random passwords — generated in your browser

Percentage Calculator

Calculate percentages, increases, decreases & more

Word Counter

Count words, characters, sentences & reading time instantly

PDF Merger

Combine multiple PDFs into one file

PDF Compressor

Reduce PDF file size while keeping quality

PDF Splitter

Extract pages or split PDF into parts

JPG to PDF

Convert one or many images into a single PDF

PDF to JPG

Extract every page as a JPG image

QR Code Generator

Create QR codes for URLs, text, WiFi or anything

Image Compressor

Reduce image file size without losing quality

Image Resizer

Resize images by pixels or percentage

Image Format Converter

Convert between JPG, PNG, WebP, AVIF

Image Cropper

Crop images to any aspect ratio

JSON Formatter

Format, validate & minify JSON in your browser

Regex Tester

Test regular expressions in real-time

Base64 Encoder / Decoder

Encode or decode Base64 instantly

JWT Decoder

Decode JSON Web Tokens — 100% client-side

Hash Generator

Generate MD5, SHA-1, SHA-256, SHA-512 hashes

URL Encoder / Decoder

Encode or decode URL-safe strings instantly

UUID Generator

Generate v4 UUIDs — cryptographically random

Unix Timestamp Converter

Convert between Unix timestamps and human dates

Color Picker & Converter

Pick colors and convert HEX ↔ RGB ↔ HSL

Markdown Editor

Write Markdown with live HTML preview

SQL Formatter

Format and beautify SQL queries

CSS Gradient Generator

Design linear and radial CSS gradients visually

AI Text Detector

Detect AI-generated text with rule-based heuristics

AI Token Counter

Count tokens for GPT-4, Claude, Gemini — with cost estimates

Tiktoken Visualizer

See your text tokenized — colorful, instant, for GPT/Claude/Gemini

Multi-Model AI Comparator

Compare GPT-4, Claude, Gemini — tokens + costs side-by-side

PII Scrubber

Remove personal info before sending text to AI

API Key Leak Detector

Scan text or files for leaked API keys — 20+ providers

ChatGPT Export Viewer

View and search ChatGPT/Claude conversation exports

Regex Explainer

Explain any regular expression in plain English

Password Breach Checker

Check if your password has been in a data breach

AI Hallucination Checker

Flag likely hallucinations in AI-generated text

Percentage Calculator

Calculate percentages, increases, decreases & more

Age Calculator

Calculate exact age in years, months, days, hours

BMI Calculator

Body Mass Index — metric and imperial

Loan Calculator

Monthly payments, total interest & amortization

Currency Converter

Live exchange rates for 170+ currencies

Tip Calculator

Calculate tips and split bills between people

Temperature Converter

Celsius ↔ Fahrenheit ↔ Kelvin — instant

Length Converter

Meters, feet, inches, kilometers, miles and more

Weight Converter

Kilograms ↔ pounds ↔ ounces ↔ grams

Countdown Timer

Count down to any date or time — live

Calorie Calculator (TDEE)

Daily calorie needs using Mifflin-St Jeor formula

AI Team Cost Calculator

Estimate monthly AI API costs for teams of any size

Compound Interest Calculator

See how money grows over time — with monthly contributions

Paycheck Calculator

Net salary after taxes — Germany, USA, UK

Crypto Tax Calculator

Calculate crypto capital gains — FIFO or LIFO

Mortgage Stress Test

Can you still afford your mortgage if rates rise?

Solar Panel ROI Calculator

Payback period + lifetime savings of solar panels

EV vs Gas Cost Calculator

Compare 5-year total cost: electric vs gasoline car

Carbon Footprint Calculator

Estimate your annual CO2 emissions

Intermittent Fasting Timer

Track 16:8, 18:6, OMAD, 5:2 — all protocols

Macro Calculator

Protein, carbs, fat for your fitness goal

A/B Test Significance Calculator

Is your A/B test result statistically significant?

Decision Matrix

Weighted pros/cons for hard decisions

Timezone Meeting Finder

Find a time that works for global teams

Schengen 90/180 Calculator

Track Schengen Area stays for digital nomads

Scientific Calculator

Full scientific calculator — trig, log, exp, memory

Area Calculator (All Shapes)

Area of rectangle, circle, triangle, polygon + more

Cooking Conversion Calculator

Cups to ml to tbsp to oz — all cooking units

Pool Volume Calculator

Gallons or liters for any pool shape

Pythagorean Theorem Calculator

a squared plus b squared equals c squared

Circle Calculator

Radius, diameter, circumference, area from any input

Fraction Calculator

Add, subtract, multiply, divide fractions

Roman Numerals Converter

Convert numbers to Roman and back

Dog Age Calculator

Convert dog age to human years (breed-aware)

Running Pace Calculator

Pace, time, distance — all three connected

Concrete Volume Calculator

Cubic yards or meters plus bags of cement

Paint Calculator

Gallons or liters needed for any room

BTU Calculator (AC Heater Sizing)

AC or heater BTU needed for any room

Gross Margin Calculator

Revenue minus COGS over Revenue — business margin

CAGR Calculator

Compound Annual Growth Rate — investments and revenue

Wire Size AWG Calculator

AWG size for any current, distance, voltage drop

Voltage Drop Calculator

Voltage loss over wire length

Ohms Law Calculator

V = I times R — solve for any of the three

Fuel Economy Calculator

MPG, L per 100km, km per L + trip cost

Tire Size Calculator

Compare two tire sizes — diameter, speedo error

Periodic Table Interactive

Click any element — atomic data, properties, uses

Molar Mass Calculator

Molecular weight from any chemical formula

Chemical Equation Balancer

Auto-balance any chemical reaction

Volume Calculator (3D Shapes)

Cube, cylinder, sphere, cone, pyramid, prism

Trigonometry Calculator

sin, cos, tan + inverse functions

Pregnancy Due Date Calculator

Due date + week-by-week trimester

Quadratic Equation Solver

Solve ax squared + bx + c = 0

Right Triangle Solver

All sides and angles from any 2 inputs

Standard Deviation Calculator

sigma, variance, mean, median for any dataset

ABV Calculator (Brewing)

Alcohol by volume from OG and FG readings

Stair Calculator

Rise, run, stringer length for any staircase

Tile Calculator

Tiles + waste needed for any floor/wall

Roofing Calculator

Shingle bundles and square footage for your roof

Lumber Board Feet Calculator

Board feet from length, width, thickness

Flooring Calculator

Boxes of flooring needed for any room

Drywall Calculator

Sheets, screws, mud, tape for any room

Deck Calculator

Joists, deck boards, footings for any deck

Fence Calculator

Posts, panels, rails, concrete for any fence

Gravel / Mulch Calculator

Cubic yards of gravel, mulch, or topsoil

Wallpaper Calculator

Rolls of wallpaper for any room

Torque Calculator

Torque = Force × Distance (N·m, ft·lb)

Bolt Torque Calculator

Torque spec for any bolt grade + size

Gear Ratio Calculator

Ratio, speed, torque across gear sets

Belt Length Calculator

V-belt or timing belt length from pulley geometry

Stress / Strain Calculator

σ = F/A, ε = ΔL/L, Young’s modulus

Tap Drill Size Chart

Pilot hole size for any tap thread

Cutting Speed Calculator

RPM from surface speed and tool diameter

Resistor Color Code Calculator

4, 5, 6 band resistor color → value

LED Resistor Calculator

Current-limiting resistor for any LED

Battery Capacity (Ah to Wh)

Convert between Ah, Wh, mAh, runtime

kW / kWh / HP Converter

Power units — watts, kilowatts, horsepower

Series / Parallel Resistance

Combined resistance of any resistor network

Motor Power Calculator

Electric motor power, current, efficiency

Force Calculator (F=ma)

Newton’s second law — force, mass, acceleration

Density Calculator

ρ = m / V — mass, volume, density any two

Projectile Motion Calculator

Trajectory, range, time-of-flight, max height

Kinetic / Potential Energy

KE = ½mv², PE = mgh — energy calculations

pH Calculator

pH from [H⁺] concentration, pOH, pKa/pKb

Molarity Calculator

Molarity = moles / liters — lab solution prep

Dilution Calculator (C1V1=C2V2)

Stock to working concentration — lab dilutions

Word Counter

Count words, characters, sentences & reading time instantly

Case Converter

UPPERCASE, lowercase, Title Case, camelCase & more

Password Generator

Strong, random passwords — generated in your browser

Lorem Ipsum Generator

Placeholder text in words, sentences or paragraphs

Text Diff Checker

Compare two texts and highlight the differences

Reverse Text

Reverse characters, words, or flip lines upside-down

URL Slug Generator

Convert titles to SEO-friendly URL slugs

AI Output Humanizer

Make AI-written text sound more human — rule-based, instant

Prompt Enhancer

Transform basic prompts into structured, high-quality prompts

Prompt Library

60+ curated AI prompt templates — ready to copy

🔒

Private

Runs entirely in your browser

⚡

Instant

No upload, no wait, no signup

♾️

Unlimited

No limits, no watermarks, ever

📱

Works offline

Install as PWA for one-tap access

Questions

What is Toololis?

Toololis is a collection of 127+ free utility tools — PDF, image, developer, calculator, and text tools. Every tool runs entirely in your browser.

Are these tools really free?

100% free with no usage limits, no watermarks, no account, no paywall. Supported by non-intrusive display advertising.

Do I need to upload my files?

No. Every tool runs in your browser. Your files, text, and data stay on your device.

How many tools does Toololis have?

127+ tools across 5 categories: PDF, Image, Developer, Calculator, and Text. New tools are added regularly.

Do the tools work on mobile?

Yes — built mobile-first. Works on phones, tablets, and desktop. Install as a PWA for one-tap access.

Is Toololis open source?

Source is on GitHub. Uses pdf-lib, pdfjs-dist, qrcode, diff, js-md5 under MIT/Apache licenses.