262 free hosting & developer tools

Look up A, AAAA, CNAME, MX, TXT, NS and more for any domain, instantly.

See whether your DNS change has reached resolvers around the world.

Find the hostname behind an IP address using a PTR lookup.

Benchmark DNS resolver response times.

Measure DNS resolution latency for a name.

Check whether a resolver supports DNS-over-HTTPS.

Check DNS cache TTLs across resolvers.

Find domains hosted on an IP address.

Look up domain or IP registration details via modern RDAP.

Generate domain name ideas from keywords.

Extract domains and URLs from text.

Discover subdomains of a domain.

Check whether WHOIS privacy is enabled.

Find lookalike domains that could impersonate you.

Get suggestions based on your keywords.

Validate your email DNS records and fix deliverability problems.

Check whether an IP is listed on major email blacklists.

Validate an email address and check its domain.

Extract every email address from pasted text.

Create mailto: links with subject and body.

See whether a domain accepts mail for any address.

Decode email headers to trace a message's path.

Flag spam-trigger words before you send.

Test an SMTP server's connectivity and banners.

Test IMAP server connectivity and capabilities.

Check an IP against major email blacklists.

Check a sender's List-Unsubscribe header.

Build a compatible HTML email template.

Check a subject line for length, spam triggers and readability.

Work out network, broadcast, usable range and host count for any CIDR.

Find the location, ISP and ASN behind any IP — or your own.

Check whether a port is open on any host from our server.

Look up the vendor behind a MAC address.

Expand a compressed IPv6 address in full.

List the hosts in an IP range and its CIDR.

Check whether a domain is DNSSEC-signed.

Pull every common record type for a domain at once.

Inspect a domain's mail exchanger records.

Inspect a domain's authoritative nameservers.

Check which certificate authorities a domain authorises.

Inspect a zone's SOA record.

Look up service (SRV) records.

Look up TXT records for a name.

Generate a DMARC record to match your policy.

Build an SPF record from your sending sources.

Generate a DKIM record template for your selector.

Test reachability and round-trip latency to any host.

Trace the network path from our server to any host.

See your public IP address and whether it is IPv4 or IPv6 — instantly.

Generate SHA-1, SHA-256, SHA-384 and SHA-512 hashes in your browser.

Create strong, random passwords with a strength estimate.

Inspect any site's TLS certificate: issuer, dates, days left and SANs.

Generate strong CSRF tokens for forms.

Generate random secret keys for apps and APIs.

Compute file checksums in your browser.

Calculate CRC32 checksums of text and files.

Generate SHA-256 hashes of any text or file.

Check when a site's TLS certificate expires.

Audit the security headers a site sends.

Check HSTS configuration and preload eligibility.

Test a URL for open-redirect vulnerabilities.

Build a Content-Security-Policy header.

Generate Subresource Integrity hashes for scripts.

Decode and inspect a PEM certificate.

Estimate the entropy (bits) of a password or key.

Generate fresh WordPress authentication keys and salts for wp-config.php.

Create htpasswd-style credential lines for basic auth.

Generate memorable, strong multi-word passphrases.

Check whether .htaccess rules are being applied.

Identify the web server and its version.

Check whether a site serves gzip or Brotli.

See whether a site supports HTTP/2.

Measure time to first byte for any URL.

Check whether a website is up right now.

Check response status and timing for any URL.

Check a page's viewport meta tag for mobile.

Detect whether a site is behind a CDN.

Check whether a domain is registered.

Check how www and non-www resolve.

Inspect a site's cache-control headers.

Minify HTML by removing comments and collapsing whitespace.

Break a URL into scheme, host, path and query parameters.

Generate complete meta tags for a page.

Scan a page's meta tags and flag problems.

Preview how your page looks in Google results.

Build a valid robots.txt for your site.

Test whether a URL is blocked by robots.txt.

Generate an XML sitemap from a list of URLs.

Build JSON-LD structured data for rich results.

Check title tags for length and duplication.

Measure keyword density and avoid over-optimisation.

Estimate a domain's age and registration history.

Generate Open Graph tags for social sharing.

Generate Twitter/X card meta tags.

Build tracked campaign URLs with utm_source, medium and campaign.

Reveal the server software a site runs.

Detect the PHP version a site advertises.

Detect the Node.js signature of a site.

Detect the WordPress version a site runs.

Identify the CMS behind any website.

A checklist for hardening your TLS configuration.

Work out how much disk your project needs.

Estimate monthly bandwidth from traffic and page size.

Estimate bandwidth from visitors, pages and assets.

Estimate multi-year domain renewal costs.

A step-by-step website migration checklist.

A safe checklist for moving DNS between providers.

Build a correct wp-config.php with database settings and fresh salts.

Generate random UUID v4s in bulk, ready to copy or download.

Encode and decode Base64 text safely in your browser.

Decode a JSON Web Token's header and payload without verifying it.

Convert Unix timestamps to dates and back, in UTC and local time.

Build and understand cron schedules with a plain-English summary.

Percent-encode or decode URLs and query strings correctly.

Test JavaScript regular expressions with matches, indices and groups.

Generate favicon and app-icon markup plus a preview from any image or emoji.

Look up the correct Content-Type for any file extension.

Look up what any HTTP status code means and what to do about it.

Inspect response headers, security headers and the full redirect chain.

See every hop in a redirect chain and why it matters for SEO.

Test JSONPath expressions against sample JSON.

Compare two JSON documents and see the differences.

Format SQL for readability across dialects.

Minify SQL into a single compact statement.

Explain a cron expression and show the next run times.

Turn a cURL command into JavaScript fetch() code.

Parse a User-Agent string into browser, OS and device.

Compute HMAC signatures with SHA-256 and friends.

Show a line-by-line diff between two texts.

Build Markdown tables from pasted rows.

Read a crontab line and describe it in plain English.

Parse and validate .env files, spotting duplicates.

Generate a .gitignore for your stack.

Convert a docker run command into docker-compose YAML.

Translate nginx rules into Traefik configuration.

Generate sortable ULIDs in bulk.

Generate time-based one-time passwords (TOTP).

Score a password and estimate crack time.

Build a cron schedule with plain-English choices and copy the expression.

Generate Apache redirect and canonical rules you can paste in.

Generate an nginx server block with HTTPS, Let's Encrypt and proxy support.

Generate an HAProxy frontend and backend config.

Generate an Apache virtual host config.

Generate a tuned php.ini for your workload.

Generate a Dockerfile for your app stack.

Generate a docker-compose.yml for common stacks.

Generate Kubernetes Deployment and Service YAML.

Generate a systemd unit for your service.

Build a crontab line with a plain-English summary.

Get ready-to-run openssl and curl commands for common tasks.

Encode and decode hex, with UTF-8 support.

Pretty-print, minify and validate JSON instantly.

Validate JSON and get precise error locations.

Convert JSON to YAML in the browser.

Convert YAML to JSON in the browser.

Flatten JSON arrays into CSV for spreadsheets.

Convert CSV rows into a JSON array.

Indent and tidy HTML source.

Minify CSS to cut bytes for production.

Minify JavaScript to cut bytes for production.

Convert between text, binary, decimal and hex.

Convert numbers to Roman numerals and back.

Convert numbers between any base from 2 to 36.

Convert between hundreds of units in one place.

Convert between Celsius, Fahrenheit and Kelvin.

Convert between metric and imperial lengths.

Convert between kilograms, pounds, stones and more.

Convert between litres, gallons and more.

Convert between km/h, mph, knots and m/s.

Count words, characters, sentences and paragraphs as you type.

Count characters with and without spaces, plus letters and digits.

Convert text to UPPER, lower, Title, Sentence and camelCase instantly.

Turn any title into a clean, SEO-friendly URL slug.

Compare two blocks of text and see exactly what changed.

Strip duplicate lines from a list while keeping the first occurrence.

Sort lines alphabetically, numerically or in reverse.

Reverse text, words or each line in one click.

Get a full readability and composition breakdown of any text.

Score text with Flesch reading ease and grade level.

Convert Markdown into clean plain text.

Turn plain text into Markdown with headings and lists.

Remove HTML tags and leave clean readable text.

Escape or unescape special characters for safe embedding.

Generate placeholder text by paragraph, sentence or word count.

Build a clean, table-based HTML signature that works everywhere.

Preview how your link renders on social and messaging apps.

Compress and resize images in your browser — nothing is uploaded.

Score a headline for length, power words and clarity.

Generate blog title ideas from a topic.

Write a meta description within the length limit.

Rewrite a paragraph in a different tone.

Count sentences and average sentence length.

Estimate how long an article takes to read.

Estimate how long text takes to speak aloud.

Spot inconsistent capitalisation in your text.

Find accidentally repeated words.

A quick-reference grammar tips sheet.

Resize images in your browser without uploading.

Convert an image to a Base64 data URI.

Convert PNG images to JPG.

Convert JPG images to PNG.

Convert images to and from WebP.

Add a text watermark to an image locally.

Calculate and match aspect ratios.

Generate every favicon size you need.

Create solid-colour placeholder images.

Turn images into a PDF in your browser.

Generate QR codes for links, text or Wi-Fi.

Convert between HEX, RGB, HSL and HSV.

Turn a HEX colour into RGB values.

Turn RGB values into a HEX colour.

Generate harmonious colour palettes.

Pick a colour and copy it in every format.

Check text/background contrast against WCAG.

Build CSS gradients and copy the code.

Design CSS box shadows with a live preview.

Generate CSS flexbox layouts visually.

Generate CSS grid layouts visually.

Build CSS keyframe animations.

Work out percentages, increases and decreases.

Calculate mean, median and mode of a number list.

Calculate variance and standard deviation.

Simplify ratios and scale them up or down.

Add, subtract, multiply and divide fractions.

Find the GCD and LCM of a set of numbers.

Test whether a number is prime.

Factorise any number into its primes.

A full scientific calculator in your browser.

Solve quadratic equations with steps.

A full summary of a data set.

Work out loan payments, interest and total cost.

Estimate mortgage payments including interest.

Project growth with compound interest.

Calculate return on investment and payback.

Add or remove VAT/sales tax from any amount.

Work out sale prices and percentage savings.

Calculate a tip and split the bill fairly.

Convert between currencies with live rates.

Convert between markup and price.

Calculate profit margin from cost and price.

Add or subtract days, weeks and months from a date.

Work out exact age in years, months and days.

Count working days between two dates.

Convert a time between timezones.

Add and subtract durations.

Find the exact gap between two dates.

Check whether a year is a leap year.

Convert between ISO 8601, Unix and local formats.

Generate an epoch timestamp for any date.

See the next run times for a cron schedule.

Convert Unix timestamps to human dates and back.

Generate random numbers in any range.

Generate random strings and tokens.

Generate a list of strong random passwords.

Pick a random name from a list.

Generate random colours with copyable codes.

Shuffle any list into a random order.

Generate random test email addresses.

Generate many passwords at once for testing.

Calculate body mass index from height and weight.

Estimate basal metabolic rate.

Estimate daily calorie needs from activity.