OneStepKit Free Online
Calculator & Tools
Calculate, convert, plan & decide in one step.
Modern tools for students, professionals, creators, and everyday life. Free. Instant.
Most popular tools.
Remove Background
Free AI background remover tool - remove BG from image in HD & 4K quality with instant cutout, transparent PNG export, and zero quality loss by CreatorBG Studio.
3D Ebook Reader
Read EPUB, PDF, Kindle MOBI/AZW3, Manga CBZ, FB2, DOCX, and TXT books with realistic 3D page flip animation, customizable typography, dark mode, ambient lighting, and local offline privacy.
Merge and Split PDF
Combine multiple PDF files or divide a PDF into individual pages or page ranges, with drag-and-drop ordering and filters.
PDF Converter Suite
Convert PDF to Word, Word to PDF, JPG to PDF, PDF to JPG, and apply rotations, passwords, watermarks, or page numbers.
PDF Editor
Edit PDF text and images locally. Change statements, names, or graphics directly on the page, keeping the exact same font and position.
PDF Compressor
Compress PDF files locally to reduce file size. Customize image quality, resolution, and optimization settings.
Dynamic QR Code Studio
Generate dynamic QR codes for products, Wi-Fi, contacts, or documents. Upload cover pages or certificates, and drag-and-drop the QR code to position it freely on the page.
Scientific Calculator
Solve scientific equations, plot live mathematical functions, and use built-in formulas with physical constants for fast homework help.
Online Protractor & Angle Finder
Measure angles 0°-360° online using an interactive protractor, upload images to measure angles on pictures, use live camera overlays, gyro sensors, and snap presets.
GPA Calculator
Calculate your semester or cumulative GPA from courses, grades, and credits with weighted and unweighted scale support included.
Attendance Calculator
Calculate how many classes you can miss or must attend to hold your target attendance percentage throughout the semester.
Typing Speed Test
Test and train your typing speed (WPM) and accuracy with a progressive levels system, live graphs, mechanical key sounds, and mistake analytics.
Salary Calculator
Convert annual salary to hourly wage and monthly pay, and explore full breakdowns across weekly, biweekly, and yearly periods.
Cloud Bot Hosting
Host your Telegram bots, Discord bots, and automated workers 24/7 on our domain. Simple token setup, instant script/file upload, sandboxed runner, and automated keep-alive.
Mortgage Calculator
Calculate monthly mortgage payments with principal, interest, taxes, insurance, and HOA, plus full amortization schedules.
Percentage Calculator
Calculate percentages, increases, decreases, discounts, and margins instantly with live results and clear formula breakdowns.
No Tax on Tips & Overtime Calculator
Calculate your federal tax deduction for qualified tips (up to $25,000) and overtime premium pay (up to $12,500) under the OBBBA 2025-2028 IRS rules.
Age Calculator
Calculate your exact age in years, months, days, and minutes from any birth date, with a live countdown to your next birthday.
Stopwatch & Timer
Track time with a high-precision stopwatch or set custom countdown timers. Supports Picture-in-Picture system-wide overlay, lap splits, and audio alarms.
Internet Speed Test
Measure your internet connection download speed, upload speed, ping latency, and jitter in real-time with an active oscilloscope waveform.
Length Converter
Convert length between centimeters, inches, feet, meters, kilometers, and miles instantly with live multi-unit results.
Weight Converter
Convert weight between kilograms, pounds, ounces, grams, and stones instantly with live multi-unit result tables.
Retro Games Hub
A collection of client-side browser games with retro-inspired styling and custom game mechanics.
Curiosity Shop & Themes
Browse custom site themes, test-drive layouts live, and unlock exclusive developer features in the curiosity theme shop.
Decision Wheel
Spin a customizable wheel of options to make random, fair decisions for teams, classrooms, giveaways, and everyday choices.
Love Calculator
Find your love compatibility percentage with a fun name-based calculation, zodiac insights, and shareable result cards for fun.
Tools organized by category.
Select a specialized directory to view all calculators, unit converters, and decision-making helpers.
PDF Workspace
A unified workspace for all your PDF actions and digital reading. Read EPUB, PDF, and Kindle books with 3D flipbook animation, compress, edit text, rotate pages, and perform OCR offline.
Student Tools
Calculators built for students. Project cumulative grades with our GPA calculator, verify course progress with our attendance calculator, and use the grade calculator for exam planning.
Work & Career
Professional productivity tools, 24/7 cloud bot hosting, and career calculators. Host Telegram/Discord bots online, estimate wage breakdowns, overtime pay, and track work timesheets.
Finance Tools
Free financial calculators for borrowing and budgeting, with mortgage, auto loan, and paycheck tax estimators included free.
Medical & Health
Track your health and wellness goals. Calculate your body mass index (BMI), basal metabolic rate (BMR), total daily energy expenditure (TDEE), pregnancy milestones, and plan calorie diets.
Life Tools
Everyday tools for tracking milestones: calculate age, find date durations, check health indexes, and plan life events fast.
Unit Converters
Convert between physical metrics instantly with length, weight, volume, temperature, and currency converters in one step.
Curiosity Lab
Fun decision making utility tools. Spin the decision wheel, generate quick outcomes with the coin flip generator, or ask questions to the yes/no oracle.
Games Hub
Play premium, retro-inspired client-side games with rich vector glow aesthetics, custom power-ups, and interactive reactor mechanics.
Small tools for specific tasks.
OneStepKit brings together calculators, converters, document tools, study helpers, work utilities, games, and a browser-based ebook reader. Open the tool that matches your task, enter or upload what it needs, and get the result without creating an account.
Calculators and converters
Use the calculator and converter tools for things like age, dates, percentages, grades, salaries, loans, measurements, temperature, volume, weight, and currency.
Files and reading
The PDF tools cover common document tasks such as merging, converting, compressing, editing, extracting images, and removing metadata. The ebook reader handles supported book formats directly in the browser.
Tools that need a network
Not every tool is local. Services such as bot hosting, dynamic QR management, contact forms, and internet speed testing need network requests to work. Their pages should explain what is sent and why.
Made to be used, not browsed
Each tool should stay focused on the task it solves. Longer explanations, formulas, or FAQs belong on a page only when they help someone use the tool or understand its result.
A few common questions
Useful answers about how OneStepKit works.
What kinds of tools are available on OneStepKit?
You can find calculators, converters, PDF and document tools, student and work utilities, games, decision tools, and the ebook reader from the category links above.
Can I use the ebook reader in my browser?
Yes. Open the Ebook Reader and load one of its supported file formats. The reader handles the reading interface in the browser and stores supported reading state locally.
Are all OneStepKit tools completely local?
No. Some browser tools process data locally, while network-based services such as bot hosting, dynamic QR management, contact forms, and speed testing need network requests.