Free browser-based utilities that streamline coding tasks with instant text processing, data conversion, and validation capabilities.
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 »SVG Loading Spinner Generator Build crisp, animated SVG loading spinners directly in the browser and copy ready-to-use markup for your project. Pick from seven popular spinner styles, fine-tune size, stroke, colors, and animation speed, then watch the live preview update instantly. Export as a self-contained inline SVG, a plain HTML + CSS snippet, or a ...
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 »Confidence Interval Calculator The Confidence Interval Calculator turns a single sample into a defensible range estimate for an unknown population parameter. Feed it your sample size, sample mean and sample standard deviation (or, for survey-style data, your sample size and number of “yes” responses) and it returns the lower bound, upper bound, margin of error ...
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 »Markdown to Slack mrkdwn Converter Paste standard Markdown and instantly get Slack-ready mrkdwn — the messaging app’s quirky variant where bold is a single asterisk, italics use underscores, and links are wrapped in angle brackets. The converter applies deterministic rewrite rules so headings collapse to bold, bullets switch to round dots, and code blocks stay ...
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 »Uptime / SLA Calculator Translate any service level agreement target into the precise downtime budget you are allowed across a year, quarter, month, week, day, or hour. The calculator works in three directions: convert an SLA percentage into allowed downtime, work backwards from a downtime ceiling to the SLA percentage you must commit to, and ...
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 »Font Modular Scale Generator The Font Modular Scale Generator builds a complete typographic scale from a single base size and a chosen mathematical ratio. Each step in the scale is the previous step multiplied by the ratio, so headings, body text, and small print stay in proportion across every screen. How to Use Set the ...
Try the Tool »RC Circuit Time Constant Calculator The RC Circuit Time Constant Calculator computes τ = R × C for resistor-capacitor circuits and τ = L / R for resistor-inductor circuits, with automatic SI unit conversion. It generates a charge / discharge table at one through five time constants and tells you how long the circuit needs ...
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 »Format R Code to the Tidyverse Style Instantly The R Code Formatter applies tidyverse and styler conventions to any R script in your browser. Paste your code and the tool fixes spacing around <- assignment arrows, comparison operators, pipe operators like %>% and |>, indents nested blocks, and flags any line that exceeds your chosen ...
Try the Tool »vCard Contact File Generator Build a properly formatted .vcf contact file (vCard 3.0 or 4.0) that phones, address books, and email clients accept on first import. Fill in the fields, watch the raw vCard update live, then download the file or copy the text. Everything runs in your browser — no contact data leaves the ...
Try the Tool »Solidity Code Formatter Paste your Solidity smart contract source and get back clean, style-guide-compliant code in the browser — no installs, no Hardhat config, no remote compilation. The formatter reorders function modifiers, sorts pragmas and imports, normalises NatSpec comments, and applies consistent indentation so the output is ready for review or audit hand-off. How to ...
Try the Tool »Battery Life / Runtime Calculator Estimate how long a battery will power a device from its capacity, voltage and load. The calculator handles mAh, Ah and Wh inputs, series/parallel cell arrangements, depth-of-discharge limits, system efficiency and the Peukert exponent for lead-acid chemistries. Output includes pack totals and time remaining at 100%, 80%, 50% and 20% ...
Try the Tool »cURL to Code Converter Paste a curl command and instantly get the equivalent HTTP-client code in Python, JavaScript, PHP, Go, or Ruby. The converter runs entirely in your browser, parses curl with a real shell-aware tokenizer, and maps the flags you actually use — headers, JSON and form bodies, multipart uploads, basic auth, cookies, redirects, ...
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 13, 2026
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