All tools

Built to beat the best equivalent online: faster, clearer, and private. Tools marked green never send your input anywhere.

Developer tools

Category page →

AI Token Counter

Count tokens and estimate cost for GPT-5, Claude 4 and Gemini 3 before you call the API.

Runs in your browser

JSON to TypeScript

Turn any JSON payload into clean, typed TypeScript interfaces in one paste.

Runs in your browser

Linux errno Reference

Search Linux errno values by number, name or message.

Runs in your browser

AI API Compatibility Tester

Paste an OpenAI-format request and see what ports to Anthropic, Gemini, Mistral, Cohere, Groq and Ollama, with the rewritten body for each.

Runs in your browser

AI Cost Calculator

Work out what an AI feature costs per month and per year across the 2026 models, ranked cheapest first.

Runs in your browser

AI Hallucination Risk Estimator

Paste any LLM response and see where it probably made things up, with a 0 to 100 risk score and a checklist of what to verify.

Runs in your browser

AI Prompt Generator

Describe a job once and get back a real brief: role, context, facts, constraints, output shape, variants and review checks.

Runs in your browser

AI Text Cleaner

Strip filler, compare paragraphs and protect key terms, all in your browser.

Runs in your browser

Changelog Generator

Paste raw commits and get sorted release sections, changelog markdown, a SemVer check and a quick QA pass before you publish.

Runs in your browser

Code Comment Generator

Draft the code comments worth keeping: the ones that say why a thing exists, not what the syntax does.

Runs in your browser

CORS Debugger

Pull the real response headers from any URL, see whether a preflight is in play, find the exact thing that's broken, and copy a server config fix.

Cron Expression Generator

Paste a cron expression, expand every field, read it in plain English and preview the real next run times.

Runs in your browser

find Command Generator

Build a Linux find command from dropdowns: path, name, type, size, age and an action, explained live.

Runs in your browser

HTTP Status Code Explainer

Type any HTTP status code to see its family, what it does to browsers and crawlers, and the SEO angle, with a reference table and a live URL check.

Runs in your browser

JSON to CSV and CSV to JSON Converter

Convert JSON to CSV and CSV back to JSON in your browser, with RFC 4180 quoting and type inference.

Runs in your browser

JWT Decoder and Claims Inspector

Decode a JWT, read its claims and weigh the signature risk, all in your browser.

Runs in your browser

Number Base Converter

Convert decimal, hex, binary and octal live in four linked boxes, with a custom base and two's complement.

Runs in your browser

Prompt Improver

Paste a rough AI prompt and get a diagnosis of what is missing, a clearer brief, the changes made and the questions only you can answer.

Runs in your browser

Regex Generator and Tester

Build a practical regex, set the boundaries and flags, then test it against your positive and negative cases. Runs locally in your browser.

Runs in your browser

sed Command Generator

Build a sed command without memorizing the syntax, with line addressing and an in-place flag that warns first.

Runs in your browser

Text Diff Checker

Compare two texts line by line, with ignore case, whitespace and blank line options, plus a unified diff you can copy.

Runs in your browser

Timestamp Converter

Convert any Unix timestamp to UTC, local time and ISO 8601, with batch and timezone views.

Runs in your browser

URL Encoder and Decoder

Decode percent-encoded URLs, parse the query string, flag tracking parameters and pull out nested redirects.

Runs in your browser

UUID Generator

Generate UUID v4 and v7, validate and export, all local.

Runs in your browser

QR Code Generator

Make scannable QR codes for URLs, Wi-Fi, email and text, fully in your browser.

Runs in your browser

Regex Tester

Test a JavaScript regex on real text, with named groups, replace preview and saved patterns.

Runs in your browser

JSON Formatter, Query and Diff

Format, query and diff JSON locally in your browser.

Runs in your browser

Color Converter

HEX, RGB, HSL, HSV and CMYK with a live WCAG contrast check and CSS tokens.

Runs in your browser

Text Case Converter

Convert text between camelCase, snake_case, Title Case and 8 more, with smart camelCase splitting.

Runs in your browser

Base64 Encoder and Decoder

Encode, decode and inspect Base64, Base64URL and data URIs in your browser.

Runs in your browser

Word and Character Counter

Count words, characters, sentences and paragraphs live, with reading time and platform limits.

Runs in your browser

XML Formatter, Parser and Audit

Format, parse and audit XML locally, with checks for sitemaps, feeds, SOAP and SVG.

Runs in your browser

YAML to JSON Converter

Convert YAML to JSON and JSON to YAML in your browser, with clear errors instead of wrong output.

Runs in your browser

YAML Validator and Linter

Validate YAML indentation, duplicate keys and config mistakes in your browser, with a JSON preview.

Runs in your browser

Network tools

Category page →

Common Ports List

Searchable TCP/UDP port reference with protocol, category and legacy filters.

Runs in your browser

DNS Lookup Tool

Pull A, AAAA, MX, TXT, NS, SOA and CAA for any domain, with SPF and DMARC hints and a second-resolver compare.

DNS Propagation Checker

Fire one lookup at Google Public DNS, Cloudflare 1.1.1.1 and a server resolver at once, then see who is propagated and who is stale.

Firewall Rule Helper

Draft UFW, iptables, nftables, firewalld, Nginx and Cloudflare rules with a CIDR check, a risk review and a ready rollback, all in your browser.

Runs in your browser

IP Geolocation Lookup

Paste a public IP or domain and read back the country, city, ASN and ISP, with two providers compared and honest accuracy notes.

IP Subnet Calculator

Network ID, broadcast, usable range, binary boundary, same-subnet check, even splits and VLSM for any IPv4 prefix.

Runs in your browser

IPv4 and IPv6 Converter

Paste one address and read back every form: dotted, integer, hex, binary, expanded, compressed and mapped.

Runs in your browser

MAC Address Lookup

Paste a MAC in any format and read back the OUI vendor, the cast and admin bits, the VM prefix and every spelling.

Runs in your browser

netsh wlan Command Reference

Search every netsh wlan command for Windows, copy it in one click, with output and variants.

Runs in your browser

HTTP Ping Test

Run repeated HTTP checks on any URL and read status, success rate, average latency and jitter.

Online Port Checker

Probe TCP ports on a host or public IP, read the exposure notes, and copy a tidy report.

Public IP vs Local IP

Paste a local IP and the public one websites see, then read what each is: IPv4 or IPv6, which range, routable or not, and the NAT boundary.

Runs in your browser

Response Time Checker

Hit a public URL several times from the backend and read average, median and the slow outliers, with status and redirect context right next to the latency.

Reverse DNS Lookup

Punch in an IP or hostname, read the PTR record, and check whether the name points back to the same address.

SSH Tunnel Command Generator

Pick a direction, drop in your ports and hosts, and copy the ssh tunnel command plus a matching ssh config block.

Runs in your browser

Traceroute Visualizer

Paste traceroute or tracert output and read the hops, RTT, timeouts and latency jumps in a clean report.

Runs in your browser

Uptime Checker

Probe a URL several times, pick what counts as up, read the success rate and latency, then size the downtime budget.

Website Status Checker

Sample a site's final status a few times over, compare it against the first-response headers and redirect path, and read an availability report.

What Is My IP Address

See the public IP your browser hands out right now, check IPv4 and IPv6 reach, and read the ISP, ASN and rough location.

Runs in your browser

WHOIS Lookup

Type a domain and read back the registrar, expiry, status codes and nameservers, with renewal risk and live DNS.

Security tools

Category page →

Breach-Safe Email Checker

Size up an email address in your browser, score the risk, check the domain records, hash it locally and get a clear action plan.

Runs in your browser

CORS Policy Generator

Build a secure CORS policy and copy ready config for Nginx, Apache, Express, FastAPI, Django and 10 more stacks, with a live security review.

Runs in your browser

CSP Header Builder

Build, import and risk-check a Content Security Policy header in your browser, then copy snippets for Apache, Nginx, Netlify and Vercel.

Runs in your browser

Cyber Audit Suite for WordPress

Paste a WordPress URL and fire 10 security checks at once, then read one posture score, sorted findings and an action plan ordered by impact.

Domain Health Check

Audit a domain in one button: DNS, WHOIS, SSL expiry, HTTP status, robots.txt and sitemap, with a fix for each gap.

Hash Generator

Generate MD5, SHA-1, SHA-256, SHA-384, SHA-512 and HMAC, then compare a checksum, all in your browser.

Runs in your browser

htpasswd Generator

Build .htpasswd lines for Apache and nginx in your browser, with apr1 and SHA-512 crypt, random salts and copy-ready snippets.

Runs in your browser

NetSecAI Cyber Audit Findings Interpreter

Paste the JSON from any cyber audit and NetSecAI turns each finding into a severity, a plain-English why and the exact config line to fix it.

Password Strength Checker

Score a password in your browser with entropy, crack-time, a weak-pattern scan, passphrase ideas and a hardening checklist.

Runs in your browser

Phishing URL Checklist

Paste a suspicious link, read the real hostname and root-domain clues, decode nested redirects, score the phishing signals and plan safe actions.

Runs in your browser

SecuChecker WordPress Security Scanner

Free WordPress security scan that pokes at the gaps behind most real break-ins, then hands back a posture score and a fix list ranked by severity.

SecurityWatch Multi-Site Monitor

Watch a list of sites five ways at once: uptime, homepage tamper, TLS expiry, missing security headers and WordPress drift, with an optional webhook.

SSL Certificate Checker

Read the live TLS certificate a host serves: expiry, issuer, subject, SAN coverage and your expected hostnames.

SSL Certificate Renewal Manager

Build SSL/TLS renewal and auto-renew commands for certbot, acme.sh, lego, Caddy, win-acme and more, with HTTP-01, DNS-01 and an expiry calculator.

Runs in your browser

SSL Expiry Monitor

Paste a list of hosts and check their SSL certs in one watchlist that sorts by days left, with a renewal plan and CSV report.

TLS Version and Cipher Selector

Pick TLS versions and cipher suites by security profile, audience and compliance, then copy a ready config for nginx, Apache, Caddy, HAProxy or IIS.

Runs in your browser

Password Generator

Strong random passwords and passphrases, generated locally.

Runs in your browser

Email & DNS tools

Category page →

DKIM Lookup Tool

Check any DKIM selector and read its public key. Pull the TXT record under selector._domainkey, confirm the key is present and report the key type.

DKIM Record Generator

Turn any public key into the exact DKIM DNS TXT record, with PEM cleanup, truncation warnings and automatic 255-character chunking.

Runs in your browser

DMARC Record Checker

Pull any domain's DMARC record and read the policy, alignment and reporting back in plain terms, with a score that flags a spoofable setup.

DMARC Record Generator

Build a correct DMARC TXT record with policy presets, a staged rollout plan and validation warnings that catch mistakes before DNS does.

Runs in your browser

Email Auth Posture Checker

Point it at a domain and grade its SPF, DKIM, DMARC and BIMI into one posture score, with a prioritised fix list and the worst issues on top.

Runs in your browser

Email DNS Health Checker

Drop in a domain and read its MX, SPF and DMARC records, then score whether the domain is wired to send and receive mail or quietly broken.

SPF Record Checker

Check a domain SPF TXT record, break down every mechanism, include and IP range, and read the -all, ~all, ?all or +all policy token.

SPF Record Generator

Build a correct SPF TXT record with provider presets and a live DNS lookup counter that warns you before you hit the 10 lookup wall.

Runs in your browser

SEO tools

Category page →

AI Crawler Blocker

Generate a robots.txt that blocks GPTBot, ClaudeBot and 20 other AI bots, plus Nginx and Apache rules.

Runs in your browser

Blog Outline Generator

Turn a topic, audience and reader outcome into a blog outline and SEO content brief a writer can actually use.

Runs in your browser

Broken Link Checker

Pull every link off one public page, test a sample for dead ends and redirect hops, keep the anchor text in view, then copy a CSV fix list.

Canonical Tag Checker

Paste a public URL and see the whole canonical picture: the declared tag, its target status, any hidden noindex or second canonical, redirects, and the http/https/www/slash variants.

CDN Detector

Paste a URL and find out who serves it: Cloudflare, Fastly, Akamai, CloudFront, Vercel, Netlify and 20 more, with the exact header or DNS line that gave it away.

Compression Checker

Paste a URL and see what Gzip or Brotli is really doing on it: HEAD next to GET headers, Vary, cache and the redirect trail, all on one screen.

Core Web Vitals Checker (INP, LCP, CLS)

Pull the real-world INP, LCP and CLS for any URL from CrUX, with mobile and desktop side by side.

Runs in your browser

FAQ Generator

Build a focused FAQ from what a page actually says, with a question map, content gaps and a JSON-LD block you ship last.

Runs in your browser

Hreflang Checker

Point it at a live page to pull the HTML hreflang alternates, validate the locale codes, read x-default and the self-reference, and sample return links.

.htaccess Redirect Generator

Generate Apache .htaccess and Nginx redirect rules for HTTPS, canonical host, trailing slashes and old URL moves.

Runs in your browser

HTTP Headers Checker

Pull the live HTTP response headers for any URL and read them as a report: security coverage, cache, redirects and cookie flags.

HTTP/3 and QUIC Checker

Probe any HTTPS URL for real HTTP/3 and QUIC support: read alt-svc, name the server software, and learn how to enable it.

Indexability Checker

Paste a URL and see if Google can index it: HTTP status, meta robots, X-Robots-Tag, robots.txt and the canonical, with the blocker named.

Internal Link Checker

Pull every link off a public URL, split internal from external, flag nofollow and vague anchors, sample live status and redirect hops, then copy a CSV repair list.

llms.txt Generator for AI Agents

Build the curated Markdown index that ChatGPT, Claude, Perplexity and Gemini read in one fetch, with best-practice checks.

Runs in your browser

Meta Description Generator

Draft, score and preview meta descriptions before they ever reach WordPress.

Runs in your browser

Meta Tags Checker

Read the live title, description, robots, canonical, H1s and social tags on any public URL, then draft a snippet against a SERP-style preview.

OG Image Preview Studio

Design and download Open Graph share-card images (1200x630 PNG) in your browser, with six templates and live Facebook, LinkedIn, Twitter and Slack previews.

Runs in your browser

Open Graph Preview

Paste a public URL to preview its Open Graph and Twitter or X share cards, see which field feeds the card, measure the image, and get an action plan.

Page Size Checker

Fetch a URL, weigh its HTML, and inventory every script, stylesheet, image and embed it references, with your own origins split from third parties.

Redirect Checker

Trace a redirect chain hop by hop, compare HTTP, HTTPS, www and non-www, batch your migration URLs, then read the final canonical and robots signals.

Robots Meta Checker

Read the robots meta tags and X-Robots-Tag header on any URL, line up the crawler-specific directives, and keep index control separate from snippet control.

Robots.txt Generator

Generate a robots.txt draft, test your real paths, compare the live file, and review crawl warnings before you publish.

Robots.txt Tester

Fetch a live robots.txt, run several paths for any crawler token, and see which group got picked and which rule won.

Schema Markup Validator

Extract JSON-LD from a URL or pasted markup, walk the graph nodes and nested types, and read property coverage for common schema families.

Runs in your browser

Schema.org JSON-LD Wizard

Build valid Schema.org JSON-LD for Product, Article, FAQPage, HowTo, Recipe, JobPosting and more, then copy the script tag and run the Rich Results Test.

Runs in your browser

XML Sitemap Analyzer

Point it at a sitemap index or a plain URL sitemap, sample the child files, flag hygiene problems and run a live status check on submitted URLs.

Technical SEO Audit Tool

Paste a live URL and get a fix-first audit: status, indexability, canonical, meta robots, robots.txt, sitemap and social tags, all read server-side.

Twitter Card Preview

Audit the Twitter or X card fields, see where each one comes from against Open Graph and SEO fallbacks, preview both layouts and check the image.

WCAG Color Contrast Checker

Check any foreground and background pair for AA and AAA contrast, with a live preview and a passing-shade fixer, all in your browser.

Runs in your browser

Sysadmin tools

Category page →