Categories

Fast, private browser-based tools for working with CSV files.

Validate, format, and convert JSON instantly in your browser.

Merge, split, reorder, and convert PDFs without uploading them.

Compress, convert, crop, and edit images privately in your browser.

Format, transform, and analyze text quickly.

Validate, format, and convert YAML config files in your browser.

Convert timestamps, calculate date differences, and work with timezones.

Convert units and work with numbers — length, weight, temperature, and more.

Hashes, checksums, UUIDs, passwords, and tokens — generated locally.

Generate QR codes, barcodes, passwords, and placeholder data instantly.

Format, convert, and validate Markdown — tables, TOCs, badges, and more.

IP lookup, DNS tools, URL parsers, and HTTP utilities — all in your browser.

Convert color formats, generate palettes, CSS gradients, and test accessibility.

Base64, Base32, Base58, hex, binary, Morse code, classical ciphers, and character encoding converters.

Loan calculators, interest, tax, ROI, and business math — client-side.

Meta tag checkers, JSON-LD generators, UTM builders, and more.

Scientific calculator, prime numbers, matrices, statistics, and more.

Coordinate converters, distance, bearing and midpoint calculators, geohashes, MGRS, Plus Codes, and lookups.

Test, explain, generate, and optimize regular expressions.

Trim, convert, and edit audio and video files — processed entirely in your browser.

Zip, unzip, split, and inspect archives and files — nothing leaves your browser.

Format, minify and inspect HTML, CSS, SQL, JavaScript and more — right in your browser.

Generate .gitignore and CODEOWNERS files, lint commits, read diffs and handle everyday Git chores — in your browser.

Format, validate, query and convert XML documents — in your browser, with nothing uploaded.

Generate privacy policies, contracts, disclosures and compliance notices from a form — fill in your details, get ready-to-paste text.

Area, perimeter, volume and coordinate geometry calculators with live diagrams.

Plot points and lines, and find slope, intercepts, distances and equations.

Mean, median, mode, spread, percentiles, primes, divisors and sequences — one calculator per question.

Solve equations, factor polynomials, work with inequalities, variation and logarithms — with the working shown.

Probability, distributions, confidence intervals, correlation and regression — one calculator per question.

Derivatives, integrals, limits, series, gradients, divergence and curl — with the working shown.

Grade, GPA, attendance and study-planning calculators for students and teachers.

Exact fraction arithmetic, ratios and number theory with every step of the working shown.

Generate graph paper, planners, charts, worksheets and flashcards you can print.

Generate printable practice worksheets with answer keys, for maths, fractions, decimals and algebra.

Randomisers, timers and grading helpers for the classroom — no accounts, nothing uploaded.

Timetables, countdowns and study planners that count school days, not calendar days.

Words per page, paper sizes, print scaling, bleeds, booklets and citation layouts.

Reading speed, book completion times, sentence and paragraph structure, and the five readability formulas.

Typing speed and accuracy tests, guided practice, the words- and keystrokes-per-minute arithmetic, and four live keyboard diagnostics.

Molar mass, moles, solutions, gas laws and equation balancing — every answer with its working shown.

Kinematics, forces, energy, electricity, waves and fluids — with units per field and the working shown.

Material and measurement calculators for the house and yard — paint to concrete, stairs to roof pitch.

Beam, bolt, pipe, tank, flow, pressure and heat calculations — textbook formulas with the working shown.

Ohm's law, resistor colour codes, capacitors, inductors, dividers, batteries and wire sizing — with the parts you can actually buy.