Every tool you need, in one place

Grades2

• GPA Calculator

  Calculate the GPA of a single semester, with optional fourth-subject support.

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• CGPA Calculator

  Calculate your cumulative GPA as a credit-weighted average across courses.

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Study2

• Quiz Maker

  Build a multiple-choice quiz and take it to test yourself.

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• Citation Generator

  Generate citations in APA, MLA, Chicago and Harvard styles.

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Writing7

• Rich Text Editor

  A WYSIWYG editor with formatting, lists, headings and links.

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• Word Counter

  Count words and characters in your text in real time as you type.

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• Character Counter

  Count characters (and words) in your text instantly.

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• Text Replacement

  Find and replace text with regex, global and case-insensitive options.

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• Text Case Converter

  Convert text between upper, lower, title, sentence, camel, snake and kebab case.

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• Spell Checker

  Flag misspelled words and get suggested corrections.

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• Argument Compiler

  Break a heated conversation into the real disagreement, assumptions and a short way to resolve it.

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Encoding3

• Text to Base64

  Encode and decode text to and from Base64.

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• Morse Code Converter

  Translate text to and from Morse code.

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• URL Encoder / Decoder

  Percent-encode and decode URL components.

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Developer3

• JSON Formatter

  Pretty-print, minify and validate JSON.

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• Hash Generator

  Generate SHA-1, SHA-256, SHA-384 and SHA-512 hashes.

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• Regex Tester

  Test JavaScript regular expressions with live matches, groups, replace mode and an explanation.

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Arithmetic7

• Percentage Calculator

  Work out percentages, what-percent and percentage change.

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• Fraction Calculator

  Add, subtract, multiply and simplify fractions.

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• Square Root Calculator

  Square, cube and nth roots, simplified radicals and exact decimals.

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• Long Division Calculator

  Long division with remainders, decimals, repeating decimals and polynomials.

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• Significant Figures Calculator

  Count, round and calculate with significant figures, and write scientific notation.

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• LCM and GCF Calculator

  Least common multiple and greatest common factor of up to 10 numbers.

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• Prime Factorization Calculator

  Prime factors, a factor tree, an is-it-prime check and all divisors.

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Algebra5

• Equation Solver

  Solve linear and quadratic equations step by step.

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• Algebra Calculator

  Simplify, expand, factor and solve expressions and equations with steps and a graph.

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• Quadratic Formula Calculator

  Solve ax^2 + bx + c = 0 with roots, discriminant, vertex, steps and a graph.

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• Factoring Calculator

  Factor polynomials step by step, or list the factor pairs of a number.

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• Logarithm Calculator

  Log of any base, ln, log10, log2, antilog and b^x = y, with change-of-base steps.

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Linear algebra2

• Tensor

  Build a tensor from data and a shape, then inspect its shape, rank, strides and values.

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• Matrix Calculator

  Add, multiply, transpose and find the determinant of matrices.

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Conversion2

• Unit Converter

  Convert length, mass, volume, time and temperature.

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• Number Base Converter

  Convert between any bases from 2 to 36, with fractions and two's complement.

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Calculus3

• Derivative Calculator

  Differentiate with steps: higher order, partial and implicit derivatives, tangent line and graph.

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• Integral Calculator

  Indefinite and definite integrals with steps, infinite bounds and a shaded area graph.

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• Limit Calculator

  Find limits at a point or at infinity, one-sided or two-sided, with the method named in the steps.

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Geometry5

• Triangle Calculator

  Solve any triangle from SSS, SAS, ASA, AAS, SSA or a right triangle, with area, steps and a diagram.

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• Pythagorean Theorem Calculator

  Find the hypotenuse or a missing leg, check Pythagorean triples and see the squares on a diagram.

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• Slope Calculator

  Slope, angle, line equation, distance and midpoint from two points, with steps and a graph.

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• Area Calculator

  Area of eleven shapes with steps, converted to acres, hectares, katha and bigha.

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• Volume Calculator

  Volume and surface area of twelve solids, in litres, gallons and cubic units.

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Calculators2

• Scientific Calculator

  A full scientific keypad with DEG, RAD and GRAD, memory, history and a live formula preview.

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• Graphing Calculator

  Plot functions, lines and points with sliders, intersections, regression and a share link.

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Descriptive2

• Statistics Calculator

  Compute mean, median, mode, range, variance and standard deviation.

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• Standard Deviation Calculator

  Sample or population standard deviation with variance, mean and the steps shown.

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Random1

• Random Number Generator

  Random numbers, coin flip, dice roller, list shuffler, name picker and lottery numbers.

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Probability4

• Z-Score Calculator

  Z-scores, percentiles and normal probabilities with a shaded bell curve and a z-table.

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• Probability Calculator

  Two events, conditional probability, Bayes' theorem and repeated trials with a Venn diagram.

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• Permutation and Combination Calculator

  nPr, nCr and repetition cases with exact big-number results and factorial steps.

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• Probability Distribution Calculator

  Normal, binomial, Poisson, t, chi-square, F and more: PDF, CDF, intervals and quantiles.

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Inference5

• P-Value Calculator

  P-value from a z, t, chi-square or F statistic, with the critical value and a plot.

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• T-Test Calculator

  One-sample, paired and two-sample t-tests (Student and Welch) with Cohen’s d and steps.

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• Confidence Interval Calculator

  Confidence interval for a mean, a proportion or a difference of means, with steps.

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• Sample Size Calculator

  Survey sample size, margin of error, mean sample size and an A/B test estimate.

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• Chi-Square Calculator

  Goodness of fit and test of independence with expected counts and Cramér’s V.

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Relationships3

• Correlation Coefficient Calculator

  Pearson r, Spearman rho and Kendall tau with p-value, confidence interval and a scatter plot.

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• Linear Regression Calculator

  Least squares line with r², p-value, residuals and predictions, plus polynomial and exponential fits.

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• ANOVA Calculator

  One-way ANOVA table with Tukey HSD post-hoc test and box plots by group.

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Neural networks1

• TensorFlow Playground

  Train a small neural network in your browser and watch the loss curve.

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Evaluation2

• Confusion Matrix Calculator

  Accuracy, precision, recall, F1, MCC and kappa from a confusion matrix or label columns.

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• ROC Curve and AUC Calculator

  ROC and precision-recall curves, AUC and a threshold slider from scores and labels.

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Clustering1

• K-Means Clustering Visualizer

  Step through k-means, find k with the elbow plot and check the silhouette score.

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Optimization2

• Gradient Descent Visualizer

  Compare SGD, Momentum, RMSprop and Adam on curves and contour maps.

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• Activation Function Plotter

  Plot sigmoid, tanh, ReLU, GELU, swish and more with derivatives, plus a softmax calculator.

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Classification2

• Decision Tree Builder

  Grow a decision tree from a CSV with Gini or entropy, and read feature importance.

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• Classifier Playground

  kNN, logistic regression and naive Bayes decision boundaries with k-fold cross-validation.

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Dimensionality1

• PCA Visualizer

  Covariance, eigenvalues, explained variance, loadings and a 2D projection from a CSV.

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Vision4

• Object Detector

  Detect objects in an uploaded image with an in-browser COCO-SSD model.

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• Face Detector

  Find faces in a photo or webcam, count them, and blur or pixelate them before you save.

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• Pose Estimator

  Draw a 33-point body skeleton on a photo or webcam and read every landmark.

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• Image Classifier

  See the top labels and scores for what is in a picture, from 1,000 everyday classes.

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Image editing2

• Background Remover

  Cut out the background of a photo on your device and save a full-size transparent PNG.

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• Image Upscaler

  Make a small image 2 or 4 times larger with Swin2SR, tile by tile, in your browser.

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Speech2

• Text to Speech

  Read text aloud with device voices, or make a natural voice and save a WAV file.

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• Speech to Text

  Transcribe audio, video or your voice with Whisper. Export TXT, SRT and VTT.

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Text recognition1

• Image to Text (OCR)

  Extract text from photos, screenshots and PDFs in English, Bangla, Hindi and more.

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Text AI3

• Sentiment Analyzer

  Score English text, a list or a CSV column as positive, negative or neutral, with an optional DistilBERT model.

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• Text Summarizer

  Summarise any text into key sentences or bullet points, instantly, with an optional AI rewrite for English.

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• Token Counter

  Count tokens with the real GPT-4o and GPT-4 tokenizers, see each token, and estimate cost from your own price.

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Exploration1

• Data Analyzer

  Upload a CSV dataset and explore summary statistics, mini histograms and a correlation heatmap.

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Visualization1

• Chart Maker

  Make bar, line, area, pie, scatter, histogram and box plot charts from CSV or XLSX data and export PNG or SVG.

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SQL2

• SQL Formatter

  Format, beautify and minify SQL for MySQL, PostgreSQL, SQLite, SQL Server, BigQuery and more.

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• Run SQL on CSV

  Load CSV or XLSX files as tables and query them with SQL in your browser, then export the results.

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Cleaning2

• Pivot Table Maker

  Summarise a CSV or Excel table by rows and columns with sum, count, average, minimum and maximum.

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• Data Cleaner

  Trim, de-duplicate, fill missing values, fix types, change case, find and replace, and flag outliers.

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• File Converter

  Convert images, audio, video, documents and more. Free, and your files never leave your browser.

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• Image Converter

  Convert PNG, JPG, WebP, AVIF, HEIC, GIF, SVG and more between formats.

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• Audio Converter

  Convert MP3, WAV, FLAC, AAC, OGG, M4A and more, or pull audio out of a video.

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• Video Converter

  Convert MP4, WebM, MOV, MKV, AVI and more, make a GIF, or extract the audio.

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• Document Converter

  Convert PDF, Word, ODT, RTF, Markdown, HTML and text files.

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• E-book Converter

  Convert EPUB, MOBI, AZW3, FB2 and CBZ e-books to the format your reader needs.

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• Presentation Converter

  Convert PowerPoint and ODP slides to PDF, images or text.

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• Vector Converter

  Convert SVG, EPS, AI, PDF and DXF vector graphics, or trace a raster image.

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• Font Converter

  Convert TTF, OTF, WOFF, WOFF2 and EOT fonts for the web or desktop.

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• Subtitle Converter

  Convert SRT, VTT, ASS, SBV, LRC and other subtitle and caption files.

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• 3D Model Converter

  Convert OBJ, STL, GLB, glTF, PLY and other 3D model files.

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• Spreadsheet Converter

  Convert XLSX, XLS, ODS, CSV, TSV and other spreadsheet files.

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• Data Converter

  Convert JSON, YAML, XML, TOML, CSV, INI and other data and config files.

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• Archive Converter

  Convert ZIP, 7Z, RAR, TAR, GZ and other archives between formats.

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