Tools

Single-purpose utilities for builders. No sign-up, no tracking — everything runs locally in your browser, and nothing you paste is ever uploaded.

• Dice Roller

  Roll d4–d100 or any RPG notation like 2d6+3, with fair crypto-backed rolls, an individual dice breakdown and a roll history.

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• Mouse Sensitivity Converter

  Convert your mouse sensitivity between games like Valorant, CS2 and Apex so your aim feels identical — and see your cm/360.

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• Hash Generator (SHA-256)

  Generate SHA-1, SHA-256, SHA-384 and SHA-512 hashes of text or a file, live, with the Web Crypto API — handy for checksums and integrity checks.

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• Number Base Converter

  Convert numbers between binary, octal, decimal, hexadecimal and any base from 2 to 36 — arbitrary precision, updating live as you type.

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• CSS Gradient Generator

  Design linear and radial CSS gradients visually — pick colours and stops, set the angle, preview live, and copy the code.

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• Tier List Maker

  Rank anything from S to D with drag-and-drop. Add text or image items, rename and recolour tiers, and download your tier list as a PNG.

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• Gamertag & Username Generator

  Generate cool gamertags and usernames for any game or platform — pick a vibe and style, add numbers or leetspeak, and copy your favourite.

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• Aim Trainer

  Click targets as fast as you can over a 15, 30 or 60-second round and track your hits, accuracy and targets per second.

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• Reaction Time Test

  Click the instant the box turns green and see your reaction time in milliseconds, plus your average of the last five tries and your best.

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• CPS Test (Click Speed Test)

  Test your click speed over 1–60 seconds with a live counter, an instant clicks-per-second score, and your best of the session.

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• Debt Payoff Calculator

  Plan your way out of debt with the snowball or avalanche method — see when you'll be debt-free, the total interest, the payoff order, and how much each strategy saves.

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• Retirement & 401(k) Calculator

  Project your retirement nest egg from your savings, monthly contributions, employer match and expected return — with a growth chart and estimated retirement income.

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• Inflation Calculator

  See how inflation erodes the value of money over time — the future buying power of an amount, what it will cost to match, and how much value is lost.

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• Tip Calculator

  Calculate the tip and split the bill between any number of people — pick a percentage and see the tip, total and amount per person instantly.

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• Savings Goal Calculator

  Work out how much to save each month to hit a target by your deadline, with interest factored in — plus total contributions, interest earned and a year-by-year plan.

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• Compound Interest Calculator

  See how savings and investments grow with compound interest and regular contributions — future balance, total interest, a growth chart and a year-by-year breakdown.

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• LLM Token Counter & Cost Estimator

  Estimate how many tokens a prompt uses and what an API call will cost, with live counts and editable input/output prices — handy for prompt engineering and budgeting.

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• Cosine Similarity Calculator

  Compute cosine similarity, dot product, Euclidean/Manhattan distance and the angle between two vectors or embeddings — paste numbers in any format.

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• LLM GPU Memory (VRAM) Calculator

  Estimate the GPU memory a model needs for inference or training from its parameter count, precision and optimizer — with an optional KV-cache estimate.

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• JSONL Converter & Validator

  Convert between JSONL and a JSON array and validate every record with the exact line number of any error — ideal for LLM fine-tuning datasets.

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• Word Unscrambler

  Enter your letters to find every valid word you can make — with blank tiles and starts-with, ends-with, and contains filters.

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• Word & Character Counter

  Count words, characters, sentences, paragraphs and reading time live as you type — great for essays, posts, and meta descriptions.

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• JSON Validator

  Paste JSON to validate and pretty-print it, with clear error messages pointing at the problem.

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• Password Generator

  Create strong, random passwords with adjustable length, character types, and a live strength meter — generated securely in your browser.

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• Diff Checker

  Compare two versions of text and see exactly what was added and removed, line by line — side-by-side or inline.

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• Image Compressor & Resizer

  Shrink and resize JPG, PNG and WebP images right in your browser — files never leave your device.

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• QR Code Generator

  Turn a link or text into a QR code and download it as a sharp PNG or scalable SVG — generated locally in your browser.

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• Age Calculator

  Find an exact age in years, months and days from any date of birth, with totals and a countdown to the next birthday.

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• Percentage Calculator

  The three everyday percentage questions in one place — percent of a number, one number as a percent of another, and percentage change.

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• Wheel Spinner & Random Picker

  Add options, spin a colourful wheel, and let it pick a fair winner — and share your exact list with a link.

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• Case Converter

  Convert text between UPPERCASE, lowercase, Title Case, camelCase, snake_case, kebab-case and more, with one-click copy.

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• Unit Converter

  Convert length, weight, temperature and volume between metric and imperial — metres to feet, kg to lb, °C to °F, cups to ml.

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• Countdown Timer & Stopwatch

  A simple countdown timer that beeps at zero and a stopwatch with laps — set a time and even share it with a link.

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• Color Picker & Converter

  Pick a colour and convert between HEX, RGB and HSL, with a built-in WCAG contrast checker for accessible text.

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• SSL Certificate Decoder

  Decode an X.509 / SSL certificate from PEM — subject, issuer, validity, SANs, key details and fingerprints, parsed locally.

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• Certificate to CSR Command Generator

  Turn a PEM certificate into a ready-to-run OpenSSL command that regenerates a matching CSR (with a new key), reusing the subject and SANs.

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• Loan & Mortgage Calculator

  Calculate monthly repayments, total interest and a full amortisation schedule, with a balance-over-time chart.

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• BMI Calculator

  Calculate your Body Mass Index in metric or imperial, with your category and a healthy weight range for your height.

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• Base64 Encoder / Decoder

  Encode and decode Base64 text (Unicode-safe), with a URL-safe option and Base64 encoding for any file.

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• JWT Decoder & Encoder

  Decode and inspect a JSON Web Token with plain-English claim feedback, verify HS/RS/ES/PS signatures (secret, PEM, JWK or JWKS), and sign new tokens — all locally.

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• Regex Tester

  Test regular expressions with live match highlighting and capture groups, using your browser's own regex engine.

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• Markdown Previewer

  Write Markdown with a live side-by-side preview and export clean HTML — all in your browser.

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• Unix Timestamp Converter

  Convert Unix timestamps to dates and back, with live epoch time and both local and UTC output.

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• UUID Generator (v4)

  Generate random UUID v4 identifiers in bulk, with uppercase and no-dashes options and one-click copy.

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