Free Tools
Privacy & Developer Tools
Free utilities for privacy, development and networking. Most run entirely in your browser; the few that cannot say so plainly. No sign-up, no tracking.
Runs in your browser
These make no network requests at all. Open your browser's network tab while you use one and you will see nothing leave the page.
Everything here runs entirely in your browser. Nothing you type, paste, or upload is ever sent to a server, logged, or stored.
Privacy
Security
Email security
Network
Encoding & Data
Base64 Encoder / Decoder
Encode and decode text or files to and from Base64.
URL Encoder / Decoder
Percent-encode and decode URLs and query strings.
JSON Formatter
Beautify, minify and validate JSON.
JWT Decoder
Inspect a token's header and payload (signature not verified).
Data Converter
Convert between JSON, YAML and CSV — all six directions, in your browser.
Developer
Diff Checker
Compare two blocks of text and see exactly what changed.
Regex Tester
Test a regular expression live, with capture groups and replacements.
Cron Expression Parser
Read a cron schedule in plain English and see when it next runs.
Color Converter & Contrast
Convert between hex, RGB, HSL and OKLCH, and check WCAG contrast.
Generators
Text
Case Converter
Convert text between camelCase, snake_case, Title Case and more.
Lorem Ipsum
Generate placeholder paragraphs, sentences or words.
Text Statistics
Word, character and sentence counts, reading time and readability.
Markdown Preview
Render Markdown to sanitized HTML and inspect its links, images and outline.
Server-side lookups
DNS, registry and certificate data has no browser equivalent, so these tools query it from our server. What you type leaves your device — it is never logged or stored.
This tool has to ask the internet. What you enter is sent to our server, which queries public DNS, registry or certificate data on your behalf. We never log it, store it, or pass it to anyone else — but unlike the browser-only tools, it does leave your device.
Security
Email security
Network
DNS Lookup
Query A, AAAA, MX, TXT, NS, SOA, CAA and SRV records for any domain.
DNS Propagation Checker
Compare what four major public resolvers are currently returning.
WHOIS / RDAP Lookup
Registration dates, registrar, nameservers and status for a domain.
IP Address Info
Who holds an IP block, where it is registered, and who to report abuse to.