Word Counter
Live word, sentence, and reading-time stats as you type.
Open toolStudy Tools Ninja
Study tools that stay out of the way.
186 free tools for assignments, citations, GPA, exams, and campus life — built for university and college.
Categories
One clear set of tools for each part of student life.
Writing & Assignments
Outline essays, count words, structure papers, and finish assignments faster.
14 tools
Essay Writing · Draft Editing · Assignment Planning · Originality Review
Citations & Research
Generate citations, format bibliographies, and organize research sources.
15 tools
Citation Generators · Bibliography Tools · Research Planning · Source Evaluation
Math & Calculators
Solve equations, convert units, and crunch numbers for STEM coursework.
22 tools
Arithmetic & Algebra · Statistics · Geometry · Finance & Numeracy
GPA & Grades
Track GPA, convert grades, and plan semester targets.
14 tools
GPA Planning · Final Grades · Grade Conversion · Graduation Tracking
Time & Productivity
Pomodoro timers, study planners, and focus tools for campus life.
11 tools
Timers · Study Planning · Deadlines · Priority Systems
Notes & Organization
Structure notes, flashcards, and study schedules cleanly.
9 tools
Flashcards · Note Templates · Knowledge Organization · Review Systems
Language & Grammar
Improve clarity, check readability, and practice languages.
12 tools
Grammar & Proofreading · Readability · Vocabulary · Text Analysis
Science & Lab
Chemistry helpers, unit conversions, and lab calculation tools.
10 tools
Chemistry · Unit Conversions · Lab Calculations · Lab Writing
Converters & Formatters
Convert formats, clean text, and prepare documents for submission.
21 tools
Text Formatting · Code & Data · Encoders · Number Systems
Exam Prep
Quiz yourself, track revision, and prepare for finals.
8 tools
Practice Quizzes · Revision Planning · Memory Systems · Exam Readiness
Presentations
Outline slides, estimate speaking time, and polish presentations.
7 tools
Slide Planning · Speaking & Timing · Delivery Checklists · Visual Accessibility
Campus Life
Budget, commute, and everyday student utility tools.
11 tools
Money & Budgeting · Group Work · Health & Routines · Daily Utilities
Business & Diagrams
Build SWOT, PESTLE, Gantt, mind maps, and strategy diagrams for assignments.
15 tools
Strategy Frameworks · Project Planning · General Diagrams · Reflective Tools
Teachers & Classroom
Certificates, group makers, and classroom utilities for educators.
2 tools
Classroom Generators · Group Activities
Career & Business
CV scoring, invoices, QR codes, and freelance finance helpers.
7 tools
Career Documents · Branding & Print · Freelance Finance
PDF Tools
Merge, rotate, compress, watermark, and edit PDFs in your browser.
8 tools
Organize & Merge · Edit & Watermark · Compress & Convert · Analyze PDF
Start here
The most-used tools for assignments and exam week.
Essay Outline Generator
Turn a topic into a clear essay outline with intro, body, and conclusion.
Open toolParagraph Rewriter Helper
Clarity rewrite helper with Simplify, Tighten, and Academic modes — side-by-side original and rewrite.
Open toolThesis Statement Builder
Craft a focused thesis statement from your topic and stance.
Open toolReading Time Estimator
Estimate how long your paper takes to read aloud or silently.
Open toolAssignment Checklist
A printable checklist so you never miss submission requirements.
Open toolTitle Case Converter
Convert headings to title case, sentence case, or uppercase.
Open toolSentence Counter
Count sentences and average length for clearer writing.
Open toolBullet Point Organizer
Turn messy notes into clean bullet points for drafts.
Open toolConclusion Starter
Live conclusion starters by style — question, anecdote, evidence wrap-up, contrast, or bold restatement.
Open toolIntroduction Hook Generator
Live hook templates by style — question, anecdote, statistic, contrast, or bold claim — with per-hook copy.
Open toolOriginality Self-Check Tips
A guided checklist to review your work for originality before submission.
Open toolAll 186 tools by category
Browse every helper grouped by category — each section links to its full category page.
Writing & Assignments
Word Counter
Live word, sentence, and reading-time stats as you type.
Open toolEssay Outline Generator
Turn a topic into a clear essay outline with intro, body, and conclusion.
Open toolParagraph Rewriter Helper
Clarity rewrite helper with Simplify, Tighten, and Academic modes — side-by-side original and rewrite.
Open toolThesis Statement Builder
Craft a focused thesis statement from your topic and stance.
Open toolReading Time Estimator
Estimate how long your paper takes to read aloud or silently.
Open toolAssignment Checklist
A printable checklist so you never miss submission requirements.
Open toolTitle Case Converter
Convert headings to title case, sentence case, or uppercase.
Open toolSentence Counter
Count sentences and average length for clearer writing.
Open toolBullet Point Organizer
Turn messy notes into clean bullet points for drafts.
Open toolConclusion Starter
Live conclusion starters by style — question, anecdote, evidence wrap-up, contrast, or bold restatement.
Open toolIntroduction Hook Generator
Live hook templates by style — question, anecdote, statistic, contrast, or bold claim — with per-hook copy.
Open toolOriginality Self-Check Tips
A guided checklist to review your work for originality before submission.
Open toolAbstract Word Limiter
Trim text toward a target abstract word count.
Open toolParagraph Counter
Count paragraphs and check text structure instantly.
Open toolCitations & Research
APA Citation Generator
Generate APA 7th edition citations with DOI/ISBN lookup and a local bibliography tray.
Open toolMLA Citation Generator
Build MLA 9 citations with autocite lookup and bibliography export.
Open toolChicago Citation Generator
Create Chicago notes-bibliography or author-date citations with autocite lookup.
Open toolHarvard Citation Generator
Format Harvard author-date citations with lookup and export options.
Open toolBibliography Alphabetizer
Sort your reference list A–Z in one click.
Open toolIn-Text Citation Helper
Format parenthetical and narrative in-text citations.
Open toolDOI Lookup Formatter
Paste a DOI and format a clean citation skeleton.
Open toolResearch Question Builder
Turn a broad topic into a focused research question.
Open toolSource Credibility Checker
Evaluate whether a source is suitable for academic use.
Open toolAnnotated Bibliography Helper
Structure annotations with summary, evaluation, and reflection.
Open toolISBN Formatter
Format ISBN-10/13 strings cleanly for citations.
Open toolLiterature Finder
Search open scholarly papers across public academic APIs.
Open toolIEEE Citation Generator
Generate IEEE-style citations with autocite lookup and export.
Open toolVancouver Citation Generator
Format Vancouver/NLM-style citations for biomedical papers.
Open toolOSCOLA Citation Generator
Format OSCOLA-style citations for cases, books, and articles.
Open toolMath & Calculators
Scientific Calculator
Scientific keypad with history tape and copyable display.
Open toolPercentage Calculator
Live percentage-of, percent-of-value, and change calculations.
Open toolFraction Calculator
Add, subtract, multiply, and divide fractions with steps.
Open toolRatio Calculator
Simplify ratios and solve proportion problems.
Open toolQuadratic Equation Solver
Solve ax²+bx+c=0 with live discriminant and roots.
Open toolMean Median Mode Calculator
Compute average, median, and mode from a data set.
Open toolStandard Deviation Calculator
Calculate sample or population standard deviation.
Open toolPythagorean Theorem Calculator
Find the missing side of a right triangle.
Open toolArea Calculator
Calculate area for rectangles, circles, triangles, and more.
Open toolVolume Calculator
Find volume for cubes, cylinders, spheres, and cones.
Open toolSlope Calculator
Find slope between two points on a line.
Open toolLCM & GCF Calculator
Find least common multiple and greatest common factor.
Open toolFactorial Calculator
Compute n! for permutations and combinations prep.
Open toolPermutation & Combination Calculator
Calculate P(n,r) and C(n,r) for probability homework.
Open toolBinary Converter
Convert between binary, decimal, and hexadecimal.
Open tool2×2 Matrix Determinant
Calculate the determinant of a 2×2 matrix.
Open toolSimple Interest Calculator
Compute simple interest for finance basics.
Open toolCompound Interest Calculator
Calculate compound growth for savings problems.
Open toolDepreciation Calculator
Calculate straight-line asset depreciation.
Open toolLogarithm Calculator
Evaluate logs, change of base, and solve for x.
Open toolTriangle Calculator
Find sides, angles, and area from what you know.
Open toolBinomial Probability Calculator
Calculate binomial distribution probabilities.
Open toolGPA & Grades
GPA Calculator
Live semester GPA workspace with course grid, scale presets, and local draft save.
Open toolCGPA Calculator
Update CGPA from prior credits and this term’s GPA — live.
Open toolGrade to Percentage Converter
Convert letter grades and GPA scales to percentages.
Open toolFinal Grade Calculator
See what you need on the final exam, updated as you type.
Open toolWeighted Grade Calculator
Combine quizzes, midterms, and finals with custom weights.
Open toolPass/Fail Planner
Estimate whether you are on track to pass a course.
Open toolGrade Curve Estimator
Estimate curved scores using class average assumptions.
Open toolCredits Remaining Calculator
See how many credits you still need to graduate.
Open toolGrade Calculator
Work out your overall grade from test scores.
Open toolAttendance Percentage Calculator
Check attendance % and how many classes you still need.
Open toolInternational Grade Converter
Convert grades between common country and GPA systems.
Open toolSemester GPA Calculator
Calculate semester GPA with a live editable course table.
Open toolGPA Predictor
Predict future GPA from target course grades.
Open toolCredit Hour Calculator
Calculate total credit hours and weekly workload.
Open toolTime & Productivity
Pomodoro Timer
Focus in 25-minute sessions with short and long breaks.
Open toolStudy Session Planner
Plan focused blocks for subjects across your week.
Open toolExam Countdown Timer
Count down to exams, deadlines, and submission dates.
Open toolStudy Stopwatch
Track how long you spend on each subject.
Open toolDaily Schedule Builder
Build a simple day plan for classes and study blocks.
Open toolDeadline Reminder List
List upcoming deadlines and sort by urgency.
Open toolFocus Session Timer
Custom focus lengths for deep work without distractions.
Open toolBreak Reminder
Remind yourself to stretch and rest between study blocks.
Open toolWeekly Study Hours Logger
Log study hours by subject for the week.
Open toolEisenhower Priority Matrix
Sort tasks into urgent/important quadrants.
Open toolStudy Break Calculator
Work out an ideal study-to-break ratio for long sessions.
Open toolNotes & Organization
Flashcard Maker
Create quick Q&A flashcards for active recall.
Open toolCornell Notes Template
Structure notes with cues, notes, and summary sections.
Open toolMind Map Outline Builder
Turn a central idea into branching study outlines.
Open toolStudent To-Do List
A clean task list for lectures, labs, and submissions.
Open toolLecture Summary Template
Capture key points, questions, and action items after class.
Open toolGlossary Builder
Build a personal glossary of course terms.
Open toolRevision Sheet Maker
Compress a topic into a one-page revision sheet.
Open toolSpaced Repetition Scheduler
Schedule review intervals for long-term memory.
Open toolOnline Notepad
A quick browser notepad that autosaves as you type.
Open toolLanguage & Grammar
Grammar Proofreading Checklist
Heuristic draft scan for double spaces, repeats, passive voice, long sentences — plus a grammar checklist.
Open toolReadability Checker
Live Flesch score, approximate grade level, avg words/sentence, and sentence-length histogram.
Open toolPassive Voice Finder
Highlight sentences that may use passive voice.
Open toolSynonym Suggester
Live synonym chips from a large academic thesaurus plus Datamuse, insert into a working draft.
Open toolTransition Word Helper
Pick a relationship, click curated transitions, and build a sentence with before/after clauses.
Open toolVocabulary Builder Quiz
Practice academic vocabulary with quick quizzes.
Open toolCharacter Counter
Count characters with and without spaces for forms and abstracts.
Open toolText Density Analyzer
Analyze word frequency and repeated phrases in your draft.
Open toolAI Writing Checker
Live “AI-ish” stock-phrase finder with pattern score — not an AI detector.
Open toolAcademic Fluff Checker
Live fluff density with suggested swaps for wordy academic filler.
Open toolAcademic Tone Checker
Live formality check for slang, contractions, and second person.
Open toolSentence Length Analyser
Spot overly long or repetitive sentences in your draft.
Open toolScience & Lab
Molar Mass Calculator
Calculate molar mass from a chemical formula.
Open toolScience Unit Converter
Convert length, mass, volume, temperature, and pressure.
Open toolpH Calculator
Estimate pH from hydrogen ion concentration.
Open toolDilution Calculator
Use C1V1 = C2V2 for lab dilutions.
Open toolDensity Calculator
Find density from mass and volume.
Open toolTemperature Converter
Convert Celsius, Fahrenheit, and Kelvin.
Open toolSignificant Figures Calculator
Round values to the correct significant figures.
Open toolStoichiometry Helper
Mass↔moles calculator and limiting-reactant helper with clear worked steps.
Open toolPeriodic Table Lookup
Search H–Xe plus common heavy metals by symbol or name — detail card with Z and atomic mass.
Open toolLab Report Template
Structure aim, method, results, and discussion cleanly.
Open toolConverters & Formatters
Markdown to Plain Text
Strip markdown and keep clean plain text.
Open toolText to HTML Converter
Wrap paragraphs into simple HTML for CMS pasting.
Open toolCSV to Table Preview
Paste CSV and preview a readable table.
Open toolJSON Formatter
Pretty-print and validate JSON for CS coursework.
Open toolBase64 Encoder / Decoder
Encode or decode Base64 strings for tech classes.
Open toolURL Encoder / Decoder
Encode query strings and decode URLs safely.
Open toolWhitespace Cleaner
Remove extra spaces, tabs, and blank lines from text.
Open toolLine Break Remover
Join broken PDF copy-paste text into clean paragraphs.
Open toolNumber to Words Converter
Convert numbers into written words for formal writing.
Open toolRoman Numeral Converter
Convert numbers to Roman numerals and back.
Open toolStudy Locker Password Generator
Local random passwords with strength meter, charset toggles, and regenerate.
Open toolText Hash Generator
Generate SHA-256 hashes for CS assignments.
Open toolAI Text Cleaner
Strip hidden formatting, smart quotes, and AI copy-paste artifacts.
Open toolDuplicate Line Remover
Remove repeated lines from any list or pasted text.
Open toolReverse Text Generator
Reverse letters or words inside a full Unicode style studio.
Open toolFancy Text Generator
Unicode style studio — script, bold, italic, reverse, and more with live gallery.
Open toolBold Text Generator
Bold and other Unicode styles in a live style gallery.
Open toolSmall Text Generator
Small-caps and related Unicode styles with a live gallery.
Open toolLorem Ipsum Generator
Paragraph, sentence, or word placeholder copy with HTML output and regenerate.
Open toolText Repeater
Repeat a phrase with live separators, character count, and safe caps.
Open toolCase Converter
Switch text between UPPER, lower, Title, and Sentence case.
Open toolExam Prep
Quick Quiz Maker
Build a short quiz from your own questions and answers.
Open toolMultiple Choice Randomizer
Shuffle options so you practice without memorizing order.
Open toolRevision Timetable Generator
Distribute topics across days before an exam.
Open toolMemory Palace Planner
Map concepts to loci for memorization practice.
Open toolPractice Test Score Calculator
Convert raw marks into percentages and grades.
Open toolWeak Topic Tracker
Log topics you miss and prioritize review.
Open toolExam Day Checklist
Pack ID, pens, water, and essentials before you leave.
Open toolFormula Sheet Builder
Compile allowed formulas into a revision-friendly list.
Open toolPresentations
Slide Outline Generator
Turn a topic into a slide-by-slide presentation outline.
Open toolSpeech Timer
Time your talk and stay within assigned minutes.
Open toolWords Per Minute Estimator
Estimate speaking duration from script length.
Open toolPresentation Checklist
Check slides, timing, and delivery before you present.
Open toolElevator Pitch Builder
Craft a 30–60 second pitch for projects and interviews.
Open toolResearch Poster Planner
Plan sections for academic posters and symposium boards.
Open toolColor Contrast Checker
Check text contrast for accessible slides and posters.
Open toolCampus Life
Student Budget Calculator
Plan monthly income, expenses, and leftover savings.
Open toolStudent Loan Estimator
Estimate simple loan repayment amounts.
Open toolCommute Time Planner
Estimate weekly commute hours between home and campus.
Open toolScholarship Essay Planner
Outline prompts, evidence, and deadlines for applications.
Open toolGroup Project Task Splitter
Divide project tasks fairly across teammates.
Open toolMeeting Agenda Template
Structure club or project meetings with outcomes.
Open toolSleep Schedule Optimizer
Plan wake and sleep times around early lectures.
Open toolStudy Snack Calorie Quick Calc
Estimate calories for 15+ study snacks with protein/carb tags and a daily total accumulator.
Open toolAge Calculator
Calculate exact age from a date of birth.
Open toolRandom Name Picker
Fair name picker with history and optional remove-after-pick.
Open toolTimezone Meeting Finder
Find overlapping hours for remote group work.
Open toolBusiness & Diagrams
SWOT Analysis Generator
Fill strengths, weaknesses, opportunities, and threats — download a PNG.
Open toolPESTLE Analysis Generator
Build a Political–Economic–Social–Tech–Legal–Environmental grid.
Open toolPorter's Five Forces Generator
Map competitive rivalry and industry forces for strategy work.
Open toolAnsoff Matrix Generator
Create a market penetration and growth strategy grid.
Open toolBusiness Model Canvas Generator
Fill a 9-block business model canvas and export an image.
Open toolBCG Matrix Generator
Plot Stars, Cash Cows, Question Marks, and Dogs.
Open toolVRIO Framework Generator
Score resources as Valuable, Rare, Inimitable, and Organised.
Open toolGantt Chart Generator
Visual project timelines and task scheduling for group work.
Open toolWBS Generator
Build a work breakdown structure tree for projects.
Open toolFlowchart Generator
Sketch process and decision flowcharts and download PNG.
Open toolMind Map Generator
Branch ideas from a central topic into a downloadable map.
Open toolFishbone Diagram Generator
Root-cause analysis with a cause-and-effect fishbone diagram.
Open toolCycle Diagram Generator
Draw repeating processes and continuous loops.
Open toolGibbs Reflective Cycle Generator
Labeled 6-stage reflective practice wheel for coursework.
Open toolDecision Tree Tool
Map decisions and outcomes in a simple tree diagram.
Open toolTeachers & Classroom
Career & Business
CV Review & Resume Score
Live resume score with section checks, action verbs, and weak-phrase tips.
Open toolOnline Invoice Generator
Themed invoice with live line-item totals and print-to-PDF.
Open toolLetterhead Generator
Themed letterhead with live preview and print-to-PDF.
Open toolBusiness Card Generator
Themed business card preview with contact fields and print.
Open toolQR Code Generator
Live QR for URL, Wi-Fi, or email with size and error-correction controls.
Open toolFreelance Tax Calculator
Estimate tax set-aside on self-employed income.
Open toolChannel Margin Calculator
See markup and margin across a distribution channel.
Open toolPDF Tools
Merge PDF
Combine multiple PDFs into one file in your browser — reorder files, then download.
Open toolOrganize PDF
Reorder, rotate, delete, or extract PDF pages with thumbnail previews in your browser.
Open toolRotate PDF
Rotate selected or all PDF pages and download a corrected file.
Open toolCompress PDF
Shrink PDF size with quality presets. Best-effort browser compression — results vary.
Open toolEdit PDF
Add text, highlights, shapes, and images as overlays on PDF pages in your browser.
Open toolWatermark PDF
Preview and apply text watermarks across PDF pages in your browser.
Open toolPDF Word Counter
Count words and characters in a PDF locally, with optional OCR for scanned pages.
Open toolPDF Image Converter
Convert PDF pages to PNG/JPG (ZIP download) or build a PDF from images.
Open toolBuilt for clarity, not clutter.
Study Tools Ninja keeps every tool minimal: one job, fast load, clear result. No accounts, no noise — just the helpers students need for writing, research, math, and campus life.
- SEO-friendly pages for every tool
- Works on phone, tablet, and laptop
- Free for university and college use