Geek Tools Dashboard

Free online tools that work in your browser, with no sign-up: convert Unix timestamps, format JSON, check live exchange rates, pick colors, take an MBTI or IQ test, and plan your day.

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GeekTask

Plan your day with one-off or repeating tasks (daily, weekly, monthly). Unfinished items carry over.

Productivity Daily

Official Site ↗

GeekLanguage

Learn English vocabulary 150 words a day: Know or Don't Know, missed words come back, spaced review. 20,000 words with American audio and Chinese meanings.

Language Learning Daily

Dusk Flap, Steel Patrol and Sidetrack — small, fast browser games. No install, no login, just play.

Arcade Browser No install

Write and run Java 21 right in your browser — a fast, clean pad for coding-interview practice. No install, no login.

Java Interview Dev

Draw software architecture diagrams: drag components, connect them, group them in zones. Export PNG, PDF or SVG — or let AI draw the first version.

Architecture Design Dev

Live Rates Dashboard

Real-time crypto prices, gold, and forex exchange rates with customisable currency pairs.

Finance Live Forex

Unix Timestamp Converter

Convert Unix timestamps in seconds, milliseconds, microseconds or nanoseconds to dates and back. Shows the current epoch time live.

Epoch Calendar & Date Picker

Pick a date and time and get the epoch, Unix seconds, ISO 8601, week number and day of year. Includes a 12-month day-of-year calendar.

Date Calculator

Count the days between two dates, add or subtract days, months or business days, and work out an exact age in years, months and days.

Rich Text Editor

Write formatted text and get clean HTML as you type. Copy it, download it, or edit the HTML directly.

Live World Clock

Live clocks for cities around the world, with each city's time difference from you.

Time Live World

JSON Formatter & Validator

Format, minify and validate JSON. An error shows the exact line and column, with a hint to fix it.

English Dictionary

Look up word meanings, IPA pronunciations (US/UK), examples, and images.

Dictionary Language Learning

Base64 Encoder & Decoder

Encode text or files to Base64 and decode Base64 to text, images or files. UTF-8, URL-safe and data URIs.

Dev Converter Files

JWT Decoder & Verifier

Decode JSON Web Tokens, see exp and iat as dates and whether the token has expired, and verify HS256, RS256 or ES256 signatures.

Dev Security Auth

URL Encoder & Decoder

Percent-encode or decode text and URLs (%20, + and UTF-8), fix double encoding and split a URL into its query parameters.

MD5, SHA-1, SHA-256, SHA-512 and CRC32 of text or files, HMAC with a secret key, and a check against a download's checksum.

Dev Security Files

Compare two texts or files line by line: removed, added and changed words are marked, side by side or unified, with a patch to copy.

Test a regular expression on your text: matches are highlighted live, with capture groups, a replace preview and a plain-English explanation.

Cron Expression Generator

Read any cron expression in plain English, see its next run times in your time zone, or build one without learning the syntax.

Password Generator

Create strong random passwords, easy-to-type passphrases and PINs, and check how quickly a password could be guessed.

Security Random

Random Number Generator

Pick random numbers in any range, with or without repeats. Pick winners from a list, shuffle a list, roll dice or flip a coin.

A random name picker wheel. Add names or options, spin, and remove the winner for the next round. Fair, with sound and full screen.

Random Team Generator

Split a list of names into random teams or groups. Balance teams by skill, spread groups evenly, pick leaders, share the result.

QR Code Generator

Make a QR code for a link, Wi-Fi network, contact or text and download it as PNG or SVG. Free, no sign-up, never expires.

Number Base Converter

Convert between binary, octal, decimal, hex and any base from 2 to 36, with two's complement, fractions and the working shown step by step.

IP Subnet Calculator

Get the network, broadcast, host range and mask for any IPv4 or IPv6 address and CIDR prefix. Split subnets and turn IP ranges into CIDR.

Chmod Calculator

Tick read, write and execute to get the chmod number (755, 644) and the rwx string, or decode one. Setuid, sticky bit and umask included.

Count words, characters, sentences and paragraphs as you type, with reading time, keyword density and limits for X, SMS and Google.

Text Productivity

Translate text to binary, hex, decimal or Unicode code points and back again, in UTF-8, UTF-16 or Latin-1, with the bytes of every character.

Morse Code Translator

Translate text to Morse code and back. Play it as sound and a flashing light at any speed, download a WAV file and learn with a clickable chart.

Change text to UPPERCASE, lowercase, Title Case or Sentence case, or turn names into camelCase, snake_case and kebab-case.

Lorem Ipsum Generator

Make placeholder text by paragraphs, sentences, words or exact characters, plus lists and headings. Copy it as plain text, HTML, Markdown or JSON.

Convert CSV to JSON and JSON to CSV. Finds the delimiter, handles quoted cells, flattens nested JSON and makes Excel-ready files.

Convert YAML to JSON and JSON to YAML. Shows the line of any YAML error and handles anchors, merge keys, multi-document files and CloudFormation tags.

Format and beautify SQL for MySQL, PostgreSQL, SQL Server, Oracle and 16 more dialects. Upper-case keywords, pick the indent, or minify to one line.

Format, validate and minify XML. Shows the line of every error with a plain-English fix, converts XML to JSON and tests XPath queries.

HTML, CSS & JS Formatter

Beautify messy or minified HTML, CSS and JavaScript, or minify it for production and see the bytes you save.

Markdown to HTML

Markdown editor with live preview. Converts Markdown to HTML and HTML (also from Google Docs or Word) to Markdown, with tables, task lists and safe HTML.

Generate UUID v4, v7, v1 and v5 in bulk, or decode any UUID to see its version and time.

Dev Random Bulk

Share text and files across your devices with a 6-digit code — no login required.

Share Files Cross-device

Pick a color from an image, the palette, RGB sliders or anywhere on your screen. Copy it as HEX, RGB or HSL and check text contrast.

Design HEX Eyedropper

Color Contrast Checker

Check if a text color and a background color have enough contrast for WCAG AA and AAA, and get the nearest colors that pass.

Image Compressor & Resizer

Make JPG, PNG and WebP images smaller in your browser: quality or target size in KB, resize, convert to WebP, download all as ZIP. Nothing is uploaded.

MBTI Personality Test

Answer 48 questions to find your 4-letter type, with a per-axis breakdown and a full profile for each of the 16 types. Private — runs in your browser.

Personality Quiz 16 Types

20 timed reasoning puzzles for an estimated IQ, your percentile on a bell curve, and a per-category breakdown. Private — runs in your browser.

IQ Quiz Reasoning

Windows screenshot app with annotation — plus capture-while-scrolling to grab full long pages. Free download.

Screenshot Scrolling Windows

Popular tasks

Why GeekTools

Free, no sign-upEvery tool is free to use. Only GeekTask needs an account, and it also has a guest mode.
Private by designMost tools run fully in your browser, so your JSON, keys and text are not sent to a server.
Works on any deviceEvery page works on phones, tablets and desktops, in any modern browser.

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