VCF (vCard File) to JSON Converter Turn any .vcf address book export into a clean, structured JSON array of contacts. The converter parses vCard 3.0 (RFC 2426) and vCard 4.0 (RFC 6350) files entirely in your browser, handles RFC-mandated line folding, multi-contact files, structured Name and Address values, multi-TYPE parameters, and even base64-encoded PHOTO and ...
Try the Tool »iCalendar (ICS) to JSON Converter The iCalendar (ICS) to JSON Converter parses RFC 5545 calendar content into structured JSON you can read, transform, or feed into another program. Paste an exported .ics file from Google Calendar, Apple Calendar, or Outlook and the tool unfolds long lines, unescapes TEXT values, separates property parameters from values, parses ...
Try the Tool »RSS / Atom Feed Generator Build a strictly spec-compliant RSS 2.0 or Atom 1.0 XML feed in seconds. Fill in your channel metadata, paste a block of items, and copy or download a feed that passes the W3C Feed Validator on the first try — proper XML escaping, RFC 822 / RFC 3339 dates, CDATA-wrapped ...
Try the Tool »Markdown Link & Image Extractor Pull every link and image out of a Markdown document in seconds. Paste a README, a blog post, or any other Markdown source and the extractor lists each entry with its anchor text, destination URL, optional title, and whether it points internally or externally. Reference-style links are resolved against their ...
Try the Tool »Excel (XLSX) to CSV Converter Convert any Excel workbook into a clean CSV file directly in your browser. Upload an .xlsx or .xls file, pick the worksheet you want, choose the delimiter and line ending, and download the result. Nothing is uploaded to a server — your spreadsheet never leaves your device. How to Use ...
Try the Tool »Prettier Config Generator Build a correct Prettier configuration without hunting through the docs. Pick every formatting option from a checklist, add per-language overrides for Markdown, HTML, YAML and JSON, and export the result as .prettierrc.json, .prettierrc.yaml, an ES module, a CommonJS module, or a ready-to-paste "prettier" key for package.json. A matching .prettierignore template is generated ...
Try the Tool »Dollar Cost Averaging (DCA) Calculator Dollar Cost Averaging is the practice of investing a fixed amount on a regular schedule regardless of market price. This calculator simulates a DCA plan period-by-period, projects the future portfolio value, and compares it to investing the same total amount as a single lump sum. The result is a clear, ...
Try the Tool »ESLint Config Generator Generate a ready-to-use ESLint configuration for your project in seconds. Pick your framework, language version, environments, and rule severities, then copy the output directly into your repo. Supports both the modern flat config (eslint.config.js, ESLint v9+) and the legacy .eslintrc.json format used by ESLint v8. How to Use Choose your config format: ...
Try the Tool »Churn Rate & Retention Calculator Calculate customer churn rate, MRR churn, Net Revenue Retention (NRR), Gross Revenue Retention (GRR), and annualized churn from a single set of inputs. Designed for SaaS operators, RevOps analysts, and founders who need precise, consistent retention metrics without spreadsheet errors. How to Use Pick the period your numbers cover (monthly, ...
Try the Tool »Ansible Playbook YAML Formatter Paste any Ansible playbook or task file and get back consistently formatted YAML with task keys in the canonical order (name → module → args → loop → when → register → notify). The tool detects whether you pasted a playbook or a task list, validates the structure, and surfaces ansible-lint ...
Try the Tool »GitHub Actions YAML Linter & Formatter Paste a GitHub Actions workflow file and instantly catch broken structure, deprecated syntax, and risky patterns before they fail a CI run. The linter validates your workflow against a built-in schema for triggers, jobs, steps, runners, permissions, and reusable workflow calls, then reformats the YAML with a workflow-aware key ...
Try the Tool »HAR to Postman Collection Converter Browser DevTools, Charles Proxy and mitmproxy all let you save captured traffic as a HAR (HTTP Archive) file, but Postman cannot import HAR directly. This converter rewrites a HAR export into a Postman Collection v2.1 JSON file in your browser, so you can replay every captured request as a real ...
Try the Tool »HAR File Performance Analyzer Upload or paste an HTTP Archive (HAR) file and instantly get a performance breakdown of every request the browser made: total transfer size, request count, slowest endpoints, biggest payloads, status code distribution and per-domain timing. Everything is parsed client-side in your browser — your HAR file never leaves the page. How ...
Try the Tool »Coordinate Format Converter Convert geographic coordinates between the three common formats — Decimal Degrees (DD), Degrees Decimal Minutes (DDM), and Degrees Minutes Seconds (DMS) — with full precision and no rounding surprises. Paste a latitude and longitude in any format and instantly get all three representations side by side, complete with a live OpenStreetMap preview ...
Try the Tool »GitHub Actions Workflow Generator Compose a valid .github/workflows/main.yml file from a guided form. Pick a language stack, choose triggers, toggle lint/test/build/deploy steps, and the generator emits a syntactically correct workflow you can drop straight into a repository. How to Use Set a Workflow Name (this becomes the label in the Actions tab). Pick a Stack ...
Try the Tool »FIRE Calculator (Financial Independence, Retire Early) Plug in your income, expenses, current savings and expected real return to see your FIRE number, how many years it will take to reach financial independence, your Coast FIRE point, and a side-by-side sensitivity table that shows how shifting your savings rate moves your retirement age. Everything runs in ...
Try the Tool »Web Vitals Score Calculator Plug in your LCP, INP, and CLS measurements and instantly see how your page rates against Google’s Core Web Vitals thresholds. The calculator returns a Good / Needs Improvement / Poor verdict per metric, a pass/fail summary for the page, and concrete fix suggestions for anything below target — all client-side, ...
Try the Tool »Format and Validate Prometheus PromQL Queries Instantly The PromQL Query Formatter & Validator tidies up the queries you write against Prometheus and other compatible time-series databases. Paste in a metric expression and the tool normalises spacing around binary operators, lays out aggregation, function calls and label matchers on their own lines when the query gets ...
Try the Tool »Customer Lifetime Value (CLV / LTV) Calculator Customer Lifetime Value tells you how much revenue or profit one customer is worth across the entire relationship — not just today’s order. This calculator covers both the classic e-commerce formula (Average Order Value × purchase frequency × customer lifespan) and the SaaS subscription formula (ARPU × gross ...
Try the Tool »Calorie Burn Calculator (Exercise & MET) Find out how many calories you burn during exercise using standardized MET (Metabolic Equivalent of Task) values from the Compendium of Physical Activities. Choose from 100+ activities across cardio, sports, strength, mind-body, dance, and daily life — then enter your body weight and either how long you exercised or ...
Try the Tool »Add IO tools to your favorite browser for instant access and faster searching
Scoreboard is a fun way to keep track of your games, all data is stored in your browser. More features are coming soon!
Update: Our latest tool was added on Jun 23, 2026
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