Hundreds of small, useful calculators and tools. Every page is optimized for search engines and runs directly in your browser.
Create secure, random passwords with customizable length and character set. Ideal for new ...
Create MD5, SHA-1, SHA-256 and SHA-512 hashes from any text directly in the browser.
Check the strength of your password. Estimates entropy, brute-force time and improvement t...
Analyze HTTP security headers such as CSP, HSTS, X-Frame-Options and more.
Encrypt and decrypt text client-side using AES.
Build a Content-Security-Policy (CSP) from individual directives.
Detect potential XSS or SQL injection patterns in input text.
Generate UUIDs in v4 and v1 format. Copy single values or entire lists with one click.
Quickly encode text to Base64 or decode Base64 back to readable text.
Encode URLs and parameters safely or decode percent-encoded characters back to readable te...
Format and validate JSON data. Detect errors and copy the result with one click.
Convert Unix timestamps to readable date formats and vice versa. Includes current timestam...
Test regular expressions in real time against sample text. Shows matches, groups and repla...
Encode special characters to HTML entities or decode entities back to readable text.
Convert numbers between binary, octal, decimal, hexadecimal and any other bases.
Convert CSV data to JSON and vice versa. Auto-detects headers and delimiters.
Convert Markdown syntax easily to HTML. Ideal for quick previews.
Break URLs into protocol, domain, path, query parameters and fragments. Nicely formatted.
Display the ASCII table with decimal, hexadecimal, octal, binary and character.
Minify CSS by removing whitespace, comments and redundant characters.
Minify JavaScript code. Removes comments and most whitespace.
Compare two texts line by line and highlight differences.
Generate a web app manifest for Progressive Web Apps with one click.
Create HTML, CSS and JavaScript snippets with live preview directly in the browser.
Format HTML, CSS, JavaScript, JSON, XML and SQL clearly and consistently.
Decode JSON Web Tokens (header, payload, signature) and check expiration date.
Create HMAC-SHA256 / SHA1 / MD5 signatures for API requests and webhooks.
Translate CRON expressions into readable German or English descriptions.
Send GET, POST, PUT and DELETE requests to APIs and view status, headers and body.
Test JSONPath expressions against JSON data directly in the browser.
Format and minify SQL queries for better readability.
Create .gitignore files for Python, Node, Java, Laravel and many other stacks.
Generate a basic Nginx server block config for static sites, PHP or proxy.
Quickly build Docker Compose stacks for web apps, databases and caches.
Convert color codes between HEX, RGB and HSL. Shows live preview and copy-ready CSS code.
Create QR codes for URLs, text, phone numbers, WiFi data and more. Download as image insta...
Create barcodes (Code128, EAN-13, UPC, CODE39) from text or numbers and download them as S...
Calculate aspect ratios for images and videos. Find matching dimensions given width or hei...
Create placeholder images in any size, color and with custom text. Ideal for mockups.
Create linear and radial CSS gradients with live preview and copyable CSS code.
Create appealing CSS shadows with a visual editor and copy the final code.
Design rounded corners and fancy blob shapes with custom border-radius.
Experiment with flexbox properties and copy the matching CSS code.
Build CSS grid layouts interactively and get instantly usable code.
Generate lighter and darker shades from a base color for your design system.
Quickly calculate your Body Mass Index from height and weight with classification.
Calculate percentages, percentage values, base values and percentage changes easily online...
Generate random numbers within any range. Perfect for games, raffles and tests.
Solve complex mathematical expressions with sine, cosine, logarithm and more.
Quickly check if a number is prime and find the next prime number.
Calculate factorials, permutations and combinations easily in the browser.
Solve quadratic equations of the form ax² + bx + c = 0 with discriminant.
Convert lengths between meter, centimeter, millimeter, inch, foot and more.
Convert time units between seconds, minutes, hours, days, weeks and years.
Convert temperatures between Celsius, Fahrenheit and Kelvin.
Convert data sizes between bit, byte, KB, MB, GB, TB and PB.
Convert length, weight, volume, area, speed and energy units.
Create placeholder text for layouts, mockups and design templates. Choose number of words,...
Count characters, words, lines and paragraphs in your text. Shows reading time and frequen...
Convert text between upper/lower case, title case, SNAKE_CASE, camelCase and more.
Create URL-friendly slugs from any text. Removes special characters and accents.
Search and replace text. Supports plain replacement and regular expressions.
Estimate the average reading time for articles and texts.
Convert text to uppercase, lowercase, title, snake_case, camelCase, kebab-case and more.
Convert CSV data with one click into a formatted Markdown table.
Calculate readability scores for German and English texts.
Remove duplicate lines from text or lists, optionally sorted.
Create random sample users with name, address, email and phone.
Check whether a word or sentence is a palindrome.
Merge multiple PDF files directly in the browser into a single document. No server upload.
Convert multiple images into a single PDF document. Reorder images and choose page size.
Resize or compress images in the browser. Choose width, height and quality, then download ...
Reduce image file size without changing dimensions. Adjustable quality and target file siz...
Convert images between PNG, JPEG and WebP. Upload and download directly in the browser.
Add text watermarks to images. Position, size, color and transparency adjustable.
Create classic memes with top and bottom captions on your own image.
Create a multi-size favicon package including ICO and PNG from an image.
Convert uploaded images into ASCII art. Width and character set adjustable.
Extract the audio track from video files directly in the browser as MP3. No server upload.
Reduce video file size directly in the browser. Adjustable resolution and bitrate.
Convert audio files between MP3, WAV, OGG and FLAC directly in the browser.
Convert images to Base64 data URLs – ideal for embeddings and data URIs.
Display Base64 strings as an image and download them. Supports data URLs and pure strings.
Record your screen, a window or a browser tab directly in the browser.
Calculate the calendar week for any date or find the date for a specific week number.
Calculate exact age in years, months, days, hours and minutes up to any reference date.
Compare times across different time zones and find suitable appointments.
Calculate VAT easily online: net to gross, gross to net, or just the VAT amount.
Calculate loan installments, interest costs and amortization schedules. Adjustable rate, t...
Calculate the reduced price and your savings from a percentage discount.
Split the bill and calculate tips easily based on total amount and percentage.
Calculate compound interest with initial capital, monthly savings rate, interest rate and ...
Validate IBANs using the modulo-97 check. Automatically removes spaces.
Let chance decide: coin flip, yes/no, dice or your own options.
Roll virtual dice with any number of sides and dice.
Show your public IPv4 and IPv6 address plus user agent.
Query DNS records for A, AAAA, MX, NS, TXT, CNAME and more.
Show all MX records of a domain with priority and target server.
Read the SPF record of a domain and display it clearly.
Query the DMARC record (_dmarc) of a domain.
Check the DKIM record for a specific selector of a domain.
Show all TXT records of a domain.
Find CNAME records for subdomains of a domain.
Find the hostname for an IP address via PTR record.
Check an IP address against known DNS blacklists (spam, abuse).
Query Whois information for a domain or IP.
Find the ASN (Autonomous System Number) and operator for an IP.
Fetch HTTP headers, status and redirects of a URL.
Check SSL/TLS certificate, expiry date and HTTPS reachability.
Send ICMP pings to a host and show latency and reachability.
Trace the network path to a host across multiple hops.
Check a domain's robots.txt for AI / LLM crawler policies.
Collect important DNS and email checks for a domain in one overview.
Calculate network address, broadcast, host range and usable IPs from IP and prefix.
Show all IPv6 AAAA records of a domain.
Query the authoritative nameservers (NS records) of a domain.
Show the SOA record of a domain with primary NS, serial, refresh, retry and expire.
Find SRV records for services like SIP, XMPP or Minecraft on a domain.
Check which certificate authorities are allowed to issue SSL certificates for a domain.
Perform a quick health check of the most important DNS records of a domain.
Check MX, SPF, DMARC, DKIM, reverse DNS and MTA-STS for optimal email deliverability.
Load the MTA-STS policy of a domain and check the enforce mode.
Query the TLS-RPT record (_smtp._tls) of a domain for TLS reporting.
Look up the BIMI record of a domain to check the displayed brand logo in mail clients.
Retrieve the LLMs.txt file of a domain – the information source for AI crawlers.
Test whether a specific TCP port on a host is reachable and open.
Query the regional internet registry (RIR) for an IP address.
Work focused in intervals: 25 minutes work, 5 minutes break, customizable.
A simple browser to-do list with local storage and progress indicator.
A simple stopwatch with start, stop, lap times and reset.
Calculate the cost of a meeting based on participants and hourly rates.
Test your typing speed in words per minute (WPM).
Enter options and let the tool decide randomly or weighted.
Create SEO-relevant meta tags for your page: title, description, Open Graph and more.
Create an XML sitemap from a list of URLs for better indexing.
Generate a robots.txt with allowed and disallowed paths plus crawler delay.
Analyze texts for word frequency and determine keyword density.
Check Open Graph and Twitter Card meta tags of any URL.
Follow HTTP redirects of a URL and display the redirect chain.
Create structured JSON-LD data for FAQ, HowTo or local businesses.
Generate creative domain ideas from keywords and TLDs.
Convert JSON to YAML and YAML to JSON in the browser.
Convert JSON to XML and XML to JSON directly in the browser.
Convert CSV data to JSON and JSON to CSV.
Convert HTML to Markdown and Markdown to HTML.
Create ready-to-use share links for Twitter, Facebook, LinkedIn, WhatsApp and email.
Generate hashtags from keywords for Instagram, TikTok, X and LinkedIn.
Create a simple mini landing page with multiple links for social media bios.
Simulate previews for X/Twitter, Facebook and LinkedIn posts including character count.
Create a complete German privacy policy with imprint information and legal bases.
Generate a legally compliant German imprint with all mandatory information.
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