Tools
Single-purpose utilities for builders. No sign-up, no tracking — everything runs locally in your browser, and nothing you paste is ever uploaded.
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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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Invoice Generator
Create a professional PDF invoice with line items, tax and nine currencies — free, no signup, no watermark, and your details never leave your browser.
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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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Lorem Ipsum Generator
Generate placeholder text by paragraphs, sentences or words — classic opening line and HTML <p> tags optional.
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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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PDF Merger & Splitter
Combine PDFs in any order, extract page ranges, or split one file per page — no upload, no watermark, your files stay on your device.
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Image Format Converter
Convert HEIC iPhone photos to JPG, or switch any image between JPG, PNG and WebP — in batches, with nothing uploaded.
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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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Unicode Inspector
Reveal invisible characters, zero-width spaces, bidi controls and lookalike letters in any text — then copy a cleaned version. All local.
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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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Time Zone Converter
Convert a date and time between cities — DST applied per date — and compare working hours on a 24-hour grid to find a meeting slot. Shareable as a link.
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URL Encoder / Decoder
Percent-encode text for URLs, decode %20-style strings, and break any URL into host, path and decoded query parameters.
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SQL Formatter
Format a wall-of-text query into readable SQL — clause-aware indentation, keyword casing, one column per line — or minify it. Never uploaded or executed.
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Cron Expression Parser
Paste a crontab line for plain English plus the next 10 run times in any time zone — with presets for common schedules.
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YAML Validator & Converter
Validate YAML with line/column errors and convert YAML ↔ JSON — see what a config actually says once types resolve.
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CSV ↔ JSON Converter
Convert CSV or TSV to JSON and back with real RFC-4180 parsing — quoted commas, embedded newlines, delimiter auto-detect.
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Code Minifier & Beautifier
Minify HTML, CSS or JavaScript with byte savings shown — or re-indent minified code so you can actually read it.
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XML Formatter & Converter
Format and validate XML with strict parser errors, minify it, or convert XML ↔ JSON with the standard @attribute mapping.
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HTML Entity Encoder / Decoder
Escape HTML special characters, decode any &-style entity, and look up what or ’ means in the searchable reference.
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PX ↔ REM Converter
Convert px to rem and back against any root font size, with a common-values table and copyable CSS output.
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Web Framework Finder
Pick your language and requirements and get a ranked shortlist of web frameworks — with GitHub stars, links and notable production users.
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.gitignore Generator
Compose a sectioned .gitignore for your OS, editor, languages and frameworks — including the secrets patterns most templates forget.
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JSON to TypeScript / Zod / Pydantic Converter
Paste JSON and get TypeScript interfaces, Zod schemas, Pydantic models or Go structs — nested types named, optional fields detected.
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Chmod Calculator
Convert Linux file permissions between checkboxes, octal and rwx notation — with special bits, plain-English explanations and a common-modes table.
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HTTP Status Code Reference
Every HTTP status code explained in practical terms — searchable, including the unofficial nginx and Cloudflare codes from real logs.
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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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Password Strength Checker
Test how strong a password is and how long it would take to crack — see its entropy and weaknesses, computed entirely in your browser.
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HMAC Generator
Compute an HMAC-SHA256 (or SHA-1/384/512) from a message and secret key, as hex or Base64 — for API signing, webhooks and JWTs. Runs in your browser.
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AES Text Encryption
Encrypt and decrypt text with a password using AES-256-GCM — share a secret safely. Runs entirely in your browser; nothing is uploaded.
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TOTP Generator (2FA Codes)
Generate the rotating 2FA code for a Base32 secret — the same TOTP your authenticator app shows, with a live countdown. Runs entirely in your browser.
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.htpasswd Generator
Create username:password entries for Apache or nginx basic auth — bcrypt, Apache MD5 or SHA-1, all hashed in your browser.
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Password Leak Checker
Check if a password has appeared in a data breach. It is hashed in your browser and only a 5-character prefix is sent (k-anonymity) — the password never leaves your device.
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Subnet & CIDR Calculator
Network and broadcast address, usable host range, netmask, wildcard and host count for any IPv4 CIDR block — plus subnet splitting. Runs in your browser.
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LLM API Cost Calculator
Estimate and compare monthly LLM API costs across models from token usage and request volume, with editable per-model prices. Runs in your browser.
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DNS Lookup
Look up a domain's A, AAAA, MX, TXT, NS, CNAME, CAA and SOA records live over DNS-over-HTTPS, each explained in plain English. Runs in your browser.
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SSH Key Generator
Generate an Ed25519 or RSA 4096 SSH key pair in OpenSSH format, entirely in your browser — the private key never leaves your device.
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Email Auth Checker
Check a domain's SPF, DKIM and DMARC records and get plain-English fixes — fetched live over DNS-over-HTTPS in your browser.
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CSP Builder & Analyzer
Analyze a Content-Security-Policy for weak directives with plain-English fixes, or build a strict CSP from a safe baseline. Runs in your browser.
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AI Text Chunker
Split text into overlapping chunks for RAG and embeddings — by tokens, characters, words or sentences — with a live preview and JSON/JSONL export.
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PII Redactor
Mask emails, phone numbers, cards, SSNs, IPs, keys and custom terms before pasting into an AI assistant — with reversible placeholders. All local.
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File Encryptor
Encrypt or decrypt any file with a password using AES-256-GCM, entirely in your browser — the file and password never leave your device.
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LLM Tool-Call Schema Builder
Build valid function-calling schemas for the OpenAI and Anthropic APIs from a form, or infer one from a sample arguments object. Runs in your browser.
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CSR Decoder
Decode a Certificate Signing Request — subject, SANs, key type and size, signature algorithm — before sending it to a CA. Runs in your browser.
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CVSS Calculator
Score a vulnerability with CVSS v3.1 — severity band, canonical vector string and a shareable link, computed with the official formulas.
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SRI Hash Generator
Generate a Subresource Integrity hash for a JS or CSS file and copy a ready-made script or link tag — so tampered CDN files are rejected. All local.
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AI Chat Export Viewer
Open your ChatGPT or Claude export, browse and search your chats, and export any conversation to Markdown or HTML. Runs entirely in your browser.
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Embedding Projector
Project labelled embedding vectors to 2D with PCA to see clusters, with a cosine-similarity nearest-neighbour list. Runs in your browser.
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