# Free online web tools

Build your .gitignore from 312 official templates, including Bun, Tauri, Expo, NestJS and Cursor. It explains what each rule ignores and tests whether a path is excluded.

Create EAN-13, EAN-8, UPC-A, Code 128, Code 39, ITF-14 and Codabar barcodes. It works out the check digit for you and downloads as SVG or PNG. All in your browser.

Format and unminify CSS, SCSS and Less with Prettier. Choose indentation and line width, then download the result. All in your browser, nothing uploaded.

Validate your compose.yaml against the official Compose schema and catch key typos, wrong types and YAML errors, with the exact line. All in your browser.

Format and indent HTML and Vue templates with Prettier, including embedded CSS and JavaScript. Choose indentation and line width. All in your browser.

Minify your HTML by removing all unnecessary characters.

Check whether an RFC, CURP, CLABE or NSS is correct. Detects the type on its own, verifies the check digit and breaks down every part of the ID. All in your browser.

Convert Unix timestamps to a readable date (ISO, UTC, local and relative time) and dates back to a timestamp, with seconds/milliseconds detection and a live clock. No sign-up.

Paste your package.json, composer.json or tsconfig.json and see what breaks moving to Node 26, Laravel 13 or TypeScript 7, on which line, and the fix.

Encode and decode URLs and parameters instantly, with a component or full-URL variant. Includes a query string parser. No sign-up.

Free online CSS minifier: minify CSS in your browser with csso. Strips whitespace and comments, merges rules without changing the cascade, keeps /*! licenses */ and calc(). No upload.

Validate, beautify and format JSON online for free. Instantly spot syntax errors, indent or minify your JSON and copy it with one click.

Format and beautify your SQL code with ease.

Count the tokens in your text or prompt and estimate the cost across GPT-5, Claude, Gemini, Kimi K3, Grok and DeepSeek. Exact OpenAI counting, per-call and monthly costs, with prompt caching.

Filter 21 SEO and GEO MCP servers by the data you need, whether they are free and whether they need installing, then copy the config for Claude Code, Claude Desktop, Cursor or Codex.

Paste text and see exactly which tokens a language model splits it into, with their IDs. Check why Spanish costs more tokens than English.

Find A, AAAA, CNAME, MX, NS, TXT and SOA DNS records for a host.

Audit a whole domain in one query: DNS, SPF, DKIM, DMARC, DNSSEC, CAA, HTTPS and security headers, with a prioritised list of what to fix.

Audit a domain's SPF, DKIM and DMARC records and get a graded report with fixes to stop email spoofing.

Look up a domain's registration data (registrar, creation and expiry dates, name servers and status) straight over the WHOIS protocol.

Free reverse IP lookup: enter an IPv4 or IPv6 address and get its reverse DNS hostname (PTR record). Learn why it will not list every domain on an IP, and how to read the result.

Build any page's meta tags (title, description, Open Graph and Twitter) with a Google-style result preview and length counters. No sign-up.

Resize your images by pixels or percentage, keeping the aspect ratio, with format change and download. All in your browser, nothing uploaded.

Remove the background from any image with AI, right in your browser. Download a transparent PNG or swap the background for a color. Free and private.

Convert numbers between binary, octal, decimal, hexadecimal and any base from 2 to 36 instantly, with arbitrary precision. All in your browser.

Your exact age in years, months and days, the months and days between two dates, how many days 2 years and 5 months are, and which year you were born. No signup.

Generate fictitious RFC, CURP, CLABE and NSS with correct check digits to seed development environments and tests. Export to JSON, CSV or SQL. No server involved.

From 1 October 2026 Meta charges 0.1565 MXN per service message from the 1,001st of the month (1,000 free per number) and 0.7298 MXN per marketing message. Work out your monthly bill and compare it with the July rate card. No sign-up.

Generate realistic mock data (names, emails, dates, UUIDs, numbers and more) with a configurable schema and export to JSON or CSV. All in your browser.

Build your site's robots.txt with per-robot rules (Allow, Disallow, Crawl-delay) and sitemaps, with quick templates. Copy or download instantly.