Free tools for developers and coders
Formatters, encoders and network checks you would otherwise script by hand.
These are the small jobs that interrupt real work: a minified API response you need to read, a Base64 string in a config file, a redirect that won't behave, an SSL certificate that might be about to expire. Each tool here does one of those jobs and gives you an exact result, not a guess.
Why not just ask a chatbot? A language model can explain what a DNS record is, but it can't look one up, and it can quietly change a character when it reformats two thousand lines of JSON. These tools run the real lookup or the real parser, so the output is the same every time you run it.
Everything here is free and translated into 25 languages. You can use the tools without an account, and a free account raises the daily limit.
Made for developers and coders
Validate and pretty-print JSON online. Find syntax errors and turn minified JSON into readable, indented code. Free JSON formatter, no signup.
Format messy SQL into clean, indented, readable queries. Great for debugging, code reviews and documentation. Works with MySQL, PostgreSQL and more. Free.
Minify HTML by removing whitespace, line breaks and comments to shrink page size and speed up loading. See before and after character counts. Free.
Minify CSS by removing spaces, line breaks and comments to make stylesheets smaller and pages faster. See the before and after size. Free CSS minifier.
Minify JavaScript by removing whitespace, comments and line breaks to cut file size and speed up your site. See before and after counts. Free JS minifier.
Encode any text or string to Base64 instantly. Useful for data URIs, HTTP Basic auth headers, email and APIs. Free online Base64 encoder.
Decode Base64 strings back to readable text instantly. Inspect auth headers, tokens, API payloads and email content. Free online Base64 decoder.
URL-encode (percent-encode) any text so it's safe in links, query strings and API requests. Spaces, &, ?, # and accents handled. Free URL encoder.
Decode percent-encoded URLs and query strings back into readable text. Turn %20, %26 and %C3%A9 into normal characters instantly. Free URL decoder.
Split any URL into its parts: scheme, host, path and query parameters. Inspect tracking links, UTM tags and API endpoints. Free online URL parser.
Parse any user agent string to see the browser, operating system and device type. Debug analytics, logs and compatibility issues. Free user agent parser.
Encode special characters like <, >, & and quotes into HTML entities, or decode entities back to text. Safely show code on web pages. Free converter.
Convert Markdown (headings, lists, links, bold, code blocks) into clean HTML for websites, emails and CMSs. Paste .md text and copy the HTML. Free.
Convert BBCode tags like [b], [i], [url], [img] and [quote] into clean HTML. Move forum posts to a website or blog. Free BBCode to HTML converter.
Convert a JPG, PNG, GIF, SVG or WebP image into a Base64 string or data URI for HTML, CSS, JSON and email templates. Free image to Base64 converter.
Paste a Base64 string or data URI and see it as an image you can view and save. Debug embedded images in HTML, CSS, JSON and emails. Free decoder.
Convert text to hexadecimal (hex) code and hex back to readable text. Handy for debugging, encoding and learning. Free online text to hex converter.
Convert text to ASCII character codes and ASCII codes back to text. Look up the number behind every letter and symbol. Free online ASCII converter.
Convert text to octal (base-8) codes and octal back to readable text. Useful for programming, Unix permissions study and puzzles. Free converter.
Calculate the size of any text in bytes, kilobytes and megabytes. Check database field, API, SMS and upload limits, including UTF-8 characters. Free.
Convert internationalized domain names (IDN) such as münchen.de to Punycode (xn--mnchen-3ya.de) and back. Spot lookalike phishing domains. Free.
Look up the DNS records of any domain: A, AAAA, CNAME, MX, NS, TXT and SOA. Check email, SPF, verification and nameserver settings for free.
Look up any IPv4 or IPv6 address to see its approximate country, city, time zone and coordinates. Free IP address lookup, no signup.
Enter an IP address to find the host name or domain associated with it through a reverse DNS (PTR) lookup. Free reverse IP lookup tool.
Check any website's SSL/TLS certificate: common name, issuing organization, signature type, issue date and expiry date. Free SSL checker.
Run a Whois lookup on any domain to see its registrar, registration and expiry dates, domain age and nameservers. Free domain Whois checker.
See the HTTP response headers a URL returns: status, server, caching, cookies, content type and security headers. Free HTTP header checker.
Check whether a website supports the HTTP/2 protocol for faster loading. Enter a URL and get an instant enabled or disabled result. Free HTTP/2 test.
Upload any file to see its MIME type, size, name and last modified date. Find out what a file really is, whatever its extension. Free MIME checker.
Also handy for developers and coders
Convert text to binary code (Hi = 1001000 1101001) and binary back to text. Learn how computers store characters. Free online binary translator.
Convert text into decimal character codes (H = 72) and decimal codes back to text. Useful for programming, encoding and puzzles. Free converter.
Remove all HTML tags from code or copied content and keep only the readable text. Clean up emails, CMS exports and web copy. Free HTML stripper.
Create strong, random passwords in one click. Pick the length and include uppercase, lowercase, numbers and symbols. Free, no signup.
Follow a URL through up to 10 redirects and see each status code (301, 302, 307, 308) and the final destination. Free redirect checker for SEO.
Find out which company hosts any website. See the host IP, ISP, organization, location and time zone of a domain's server. Free web host checker.
Turn any title into a clean, lowercase, hyphenated URL slug for blog posts, products and pages. Strips symbols and punctuation. Free slug generator.
Convert text to UPPERCASE, lowercase, Sentence case, Capital Case, camelCase, PascalCase, snake_case, CONSTANT_CASE, dot.case or param-case. Free.
Generate a random number between any minimum and maximum. Great for giveaways, games, raffles, sampling and decisions. Free random number picker.
Generate Lorem Ipsum placeholder text by paragraphs, sentences or words for mockups, websites and print layouts. Copy and paste, free.
Common questions
Why are coders and developers in one section?
Because they need the same things. Whether you write a weekend script or ship production apps, you reach for the same formatters, encoders and network checks, so we keep them on one page instead of splitting them across two near-identical ones.
Are the network lookups live?
Yes. The DNS, IP, SSL, WHOIS and HTTP header tools query real servers each time you run them, so you see the records and certificates as they are right now.