Use 130+ free online tools on Biotr.link: DNS and SSL checkers, converters, hash generators, image converters and more. No payment, instant results.
Biotr.link Free Online Tools: 130+ Web Tools You Can Use Without Paying a Cent
Checkers, converters, generators, developer utilities and image tools, all in one place and all free.
How many times have you searched for a quick tool, landed on a site, typed your input, and then hit a "Sign up to continue" wall or a "Upgrade to Pro" banner? It is frustrating, especially when all you wanted was to convert a file or check a domain.
That is exactly why the Biotr.link Tools library exists. It is a growing collection of web tools to test, convert, calculate, and generate different kinds of things. Best of all, every single tool is absolutely free to use. No hidden fees, no locked "premium" tools, no trial limits. The tools are privacy focused, give instant results, and have a simple interface anyone can figure out in seconds.
In this post we will walk through every tool category, so you can see what is available and bookmark the ones you need.
Table of Contents
- Most popular tools
- Checker tools
- Text tools
- Converter tools
- Generator tools
- Developer tools
- Image manipulation tools
- Time converter tools
- Misc tools
- FAQ
Most Popular Tools
If you are not sure where to start, begin with what other people use the most. The Meta tags checker helps you get and verify the meta tags of any website, which is a must for SEO. Developers love the Bcrypt generator for creating secure password hashes, and the Password strength checker tells you whether your passwords are good enough. Content creators rely on the YouTube thumbnail downloader to grab thumbnails in every available size, the Decimal converter turns text into decimal and back, and the Whois Lookup reveals all the details about a domain name.
Checker Tools: Test and Verify Anything Online
Checker tools help you verify the health, security and setup of websites, domains and passwords. They are especially handy for webmasters, SEO professionals and anyone managing a site.
Domain and network lookups
Use the DNS Lookup to find A, AAAA, CNAME, MX, NS, TXT and SOA records of any host. The IP Lookup gives approximate details about an IP address, while the Reverse IP Lookup does the opposite and finds the domains and hosts connected to it. Need registration details? The Whois Lookup has you covered. To see who hosts a site, try the Website hosting checker, and to test whether a server or port is reachable, use Ping.
Website performance and security
Run an SSL Lookup to inspect a certificate, or view the response with the HTTP headers lookup. You can confirm modern performance features with the HTTP/2 Checker and the Brotli Checker. The Safe URL checker tells you whether Google marks a link as safe or unsafe, the Google cache checker shows if a page is cached, and the URL redirect checker follows 301 and 302 redirects for up to 10 hops.
Everyday checkers
Beyond websites, you can test your passwords with the Password strength checker, review SEO tags with the Meta tags checker, identify a file with the File mime type checker, and fetch the avatar tied to an email with the Gravatar checker.
Text Tools: Create, Clean and Transform Text
Working with text can be tedious. These free text tools take care of the repetitive parts.
Clean up and organize
Use the Duplicate lines remover to strip repeated lines, the List alphabetizer to sort lines from A to Z or Z to A, the List randomizer to shuffle a list, and the Reverse list to flip the order of lines. The Text separator splits or joins text by new lines, commas, dots and more, and the Emojis remover wipes emojis from any text.
Extract and measure
The Email extractor and URL extractor pull addresses and links out of messy text. Count your words and characters with the Character counter, and check how heavy a text is with the Text size calculator, which reports Bytes, Kilobytes or Megabytes.
Convert and have fun with text
Switch capitalization instantly with the Case converter. Reverse content with Reverse words or Reverse letters. Get creative with the Upside down text generator, Old English text generator and Cursive text generator. Settle word games with the Palindrome checker, convert international domains with the IDN Punnycode converter, and turn writing into audio with Text to speech.
Converter Tools: Switch Between Data Formats
Developers, students and curious minds often need to translate data from one format to another. Biotr.link makes it painless.
For encoding, there is the Base64 encoder and Base64 decoder, plus the Base64 to Image and Image to Base64 tools for pictures. Handle web addresses with the URL encoder and URL decoder. Convert text to other number systems with the Binary converter, Hex converter, Ascii converter, Decimal converter and Octal converter, or send a secret message with the Morse converter. Designers can switch formats with the Color converter, and anyone writing checks or invoices will appreciate the Number to words converter.
Generator Tools: Create Links, Passwords and Hashes
Links, text and IDs
Marketers can build trackable campaigns with the UTM link generator, create chat links with the WhatsApp link generator, collect payments with the PayPal link generator, and make email links with the Mailto link generator. Share videos at the right moment with the YouTube Timestamp link generator. Need clean URLs? The Slug generator handles it. Fill a design mockup with the Lorem Ipsum generator, draw up your own sign-off with the Signature generator, create strong credentials with the Password generator, pick numbers with the Random number generator, and produce unique identifiers with the UUID v4 generator.
Hash generators
Need a checksum or password hash? Choose from the full family: Bcrypt generator, MD2 generator, MD4 generator, MD5 generator, Whirlpool generator, SHA-1 generator, SHA-224 generator, SHA-256 generator, SHA-384 generator, SHA-512 generator, SHA-512/224 generator, SHA-512/256 generator, SHA-3/224 generator, SHA-3/256 generator, SHA-3/384 generator, and SHA-3/512 generator.
Developer Tools: Speed Up Your Workflow
Make your code lighter with the HTML minifier, CSS minifier and JS minifier. Keep data tidy with the JSON validator & beautifier and SQL formatter/beautifier. Work with markup using the HTML entity converter, BBCode to HTML, Markdown to HTML and HTML tags remover. When debugging, the User agent parser and URL parser break strings into readable parts.
Image Manipulation Tools: Compress and Convert
Start with the Image optimizer to shrink files while keeping quality high, which is great for faster page loads. Then convert between the most popular formats, all for free:
- From PNG: PNG to JPG, PNG to WEBP, PNG to BMP, PNG to GIF, PNG to ICO
- From JPG: JPG to PNG, JPG to WEBP, JPG to GIF, JPG to ICO, JPG to BMP
- From WEBP: WEBP to JPG, WEBP to GIF, WEBP to PNG, WEBP to BMP, WEBP to ICO
- From BMP: BMP to JPG, BMP to GIF, BMP to PNG, BMP to WEBP, BMP to ICO
- From ICO: ICO to JPG, ICO to GIF, ICO to PNG, ICO to WEBP, ICO to BMP
- From GIF: GIF to JPG, GIF to ICO, GIF to PNG, GIF to WEBP, GIF to BMP
Time Converter Tools
Working with timestamps in logs or APIs? Use the Unix Timestamp to Date tool to see UTC and local time, or go the other way with the Date to Unix Timestamp converter.
Misc Tools: Handy Extras
Grab video thumbnails with the YouTube thumbnail downloader, scan codes from images with the QR code reader and Barcode reader, inspect photo metadata with the Exif reader, and pick the perfect shade from the wheel with the Color picker.
Why Use Biotr.link Tools?
- 100% free: nothing is locked behind a paywall.
- Privacy focused: built with your privacy in mind.
- Instant results: type, click, done.
- Simple interface: no learning curve.
- All in one place: no need to hunt for a different website for every task.
Frequently Asked Questions
Are Biotr.link tools really free?
Yes. Every tool in the library is free to use, from the Meta tags checker to the SHA-3/512 generator.
Do I need to create an account?
Browse the full list at biotr.link/tools and open any tool to get started.
Who are these tools for?
Developers, SEO experts, designers, marketers, students and everyday users who want quick results.
Final Thoughts
Whether you are checking DNS records, compressing images, generating hashes or building a campaign link, the Biotr.link Tools library has something for you, and it will not cost a thing. Visit biotr.link/tools today, bookmark your favorites, and make your daily tasks faster.
