23 free tools · no sign-up · runs in your browser

Everyday developer tools, private by default

Format JSON, decode JWTs, test regex, diff text, generate passwords and hashes, convert colors and timestamps, and inspect domains with real DNS and WHOIS data, all in one fast place.

Generators

Create secure values and ideas in one click.

Password GeneratorStrong random passwords with an entropy meter.UUID GeneratorBulk RFC-compliant v4 and v1 UUIDs.QR Code GeneratorQR codes for links, Wi-Fi, socials and text.Domain Name GeneratorBrainstorm names with live availability hints.Hash GeneratorMD5, SHA-1, SHA-256/384/512 and HMAC for text or files.

Converters

Translate between time, units, colors, number bases and files.

Timestamp ConverterUnix epoch to human dates and back.Unit ConverterLength, weight, temperature, data and more.File ConverterConvert images and preview PDFs in-browser.Color ConverterHEX, RGB, HSL, CMYK plus a WCAG contrast checker.Number Base ConverterBinary, octal, decimal, hex and any base up to 36.

Developer

Debug JSON, tokens, patterns and encodings.

JSON FormatterValidate, pretty-print, minify and sort JSON.JWT DecoderInspect token claims, expiry and HMAC signatures.Regex TesterLive matches, groups and replace with safe timeouts.Diff CheckerCompare two texts and see added and removed lines.Base64 Encoder/DecoderUTF-8 safe Base64 and data URLs for files.

Text & Media

Clean up text, work with URLs and optimize images locally.

URL Encoder/DecoderPercent-encode or decode URLs and query strings.Image CompressorShrink and resize photos without uploading them.Text ToolsChange case, sort lines, count words, format JSON.URL ParserSplit a URL into parts and edit its query string.

Network & Domains

Inspect real DNS, registry, IP and browser data.

WHOIS LookupRegistrar, expiry and status from the registry.DNS LookupLive A, AAAA, MX, TXT, CNAME, NS and SOA records.IP LookupYour public IP plus location and network owner.User Agent ParserSee your browser, OS and device, or parse any UA.

Why people use DevTools Hub

Private by design

Every tool except the DNS, WHOIS and IP lookups runs entirely in your browser. The JSON, tokens, files and text you paste never reach our servers.

Real data, not guesses

DNS lookups query Cloudflare and Google resolvers live, and WHOIS uses RDAP straight from each registry. Random values come from the Web Crypto API.

Free, no sign-up

Every tool is free with no account, limits or watermarks. Each one comes with a short guide explaining how it works and when to use it.

From the blog

Practical guides behind the tools.

All articles

How to Create a Strong Password: Why Length Beats Complexity

What actually makes a password hard to crack, how entropy is measured, and a simple system for using strong, unique passwords everywhere.

November 5, 2026 · 7 min read

DNS Records Explained: A, AAAA, CNAME, MX, TXT and NS

A plain-English tour of the DNS record types you will meet when setting up a website or email, with real examples and common mistakes.

November 5, 2026 · 8 min read

UUID v1, v4 and v7 Explained: Which Identifier Should You Use?

How the different UUID versions are built, how they affect database performance, and when an auto-increment integer is still the better choice.

November 5, 2026 · 7 min read

Frequently asked questions

Are these tools really free?

Yes. Every tool is free to use without an account, limits or watermarks. The site is supported by advertising.

Do you store the data I enter?

Browser-based tools never send your input anywhere. For DNS, WHOIS and IP lookups, the domain or IP you enter is sent to our server only to perform the lookup and is not stored. See the Privacy Policy for details.

Which tools need an internet connection?

Only DNS Lookup, WHOIS Lookup, IP Lookup and the Domain Name Generator, because they query live internet services. Once a page has loaded, the other tools keep working even if you go offline.

Can I suggest a new tool or report a bug?

Please do. Use the Contact page to send suggestions or bug reports; new tools are added based on what people ask for.