Reference
The Toolbox
38 tools, grouped by where they fit in the work rather than by what protocol they speak. Each page covers what the tool does, when it genuinely helps, and whether it is worth running without you.
Debug HTTP
When the browser console is telling you something unhelpful, these let you see the raw exchange — headers, status, the preflight, the handshake — without a framework in the way.
- HTTP Request Send a request with exactly the method, headers and body you choose, and see the raw response — the fastest way to…
- HTTP Headers Inspect the response headers a URL returns, and diagnose the caching, compression and content-type problems that m…
- CORS Tester Test cross-origin headers including the preflight exchange, and understand why a request that works in curl is blo…
- Text Diff Compare two blocks of text and see exactly what changed, including the whitespace and invisible characters that ma…
- WebSocket Probe Test whether a WebSocket endpoint accepts connections and completes the upgrade handshake, separating a proxy prob…
- Dead Link Checker Crawl a page or site for broken internal and external links, and find the ones that decayed after you shipped rath…
Optimize
Loading a page in a real browser and looking at every request it makes is more informative than any score out of a hundred. These produce the waterfall, the journey and the field data.
- Page Load Timing Load a page in a real browser and see every request it makes with timing, so a performance number becomes a specif…
- Browser Flow Script a multi-step journey in a real browser — click, fill, assert — and catch the broken flows that a page-level…
- DNS Propagation Check See which resolvers worldwide have picked up a DNS change, and tell the difference between normal caching and a ch…
- IP Geolocation Look up the location and network behind an IP address, with a realistic view of how accurate that is and what it c…
Secure
The security work that belongs to whoever builds the site rather than whoever runs the network: content policy, transport headers, and the plugin nobody has updated since launch.
- Security Header Check Grade the security headers your site returns, and understand which ones are worth the deployment risk and which wi…
- CSP Evaluator Analyse a Content Security Policy for the weaknesses that make it decorative — unsafe-inline, overly broad sources…
- HSTS Preload Checker Check a domain's HSTS header and preload eligibility, and understand the commitment before submitting something th…
- Site Standards Check Check whether a site publishes the conventional files and metadata — robots, sitemap, security contact, manifest —…
- WordPress Scanner Scan a WordPress site for its version, themes and plugins, and check the installed components against a live vulne…
- Drupal Scanner Detect a Drupal site's core version and modules from outside, and check them against known vulnerabilities before …
Ship
How your page renders in a share card, what palette it is actually using, and what a visitor can tell about your stack — the things that only surface after it is public.
- Meta Tag Preview Preview the title, description and image a page produces when shared on social platforms and in search results, be…
- Site Colour Palette Extract the colours a live page really uses, and compare them against the palette you intended before design drift…
- Tech Stack Detector Identify the frameworks, servers and services a site exposes through its headers and markup — including the versio…
Convert
Base64, hex, entities, timestamps, JWTs. The tools you open in a second tab twenty times a day, usually because something arrived in a format you did not choose.
- Base64 Encoder / Decoder Encode or decode Base64 in the browser, whether you are reading an auth header, inspecting a data URI or checking …
- URL Encoder / Decoder Encode or decode URL components correctly, and see why a parameter containing a plus sign or an ampersand is arriv…
- HTML Entity Converter Convert between characters and their HTML entity forms to see how content will render, and to understand where esc…
- Hex Converter Convert between text and hexadecimal to inspect byte-level content, spot encoding mismatches, and identify files f…
- Binary Converter Convert between text and binary to inspect individual bits, work with flag fields and bitmasks, or explain what a …
- Case Converter Convert identifiers between camel, snake, kebab, pascal and title case, for the boundaries where two systems disag…
- Number Base Converter Convert numbers between decimal, hexadecimal, binary and octal, for colours, permissions, error codes and anything…
- Unix Timestamp Converter Convert between Unix timestamps and human-readable dates, and check whether a value is in seconds or milliseconds …
- IP Decimal Converter Convert IPv4 addresses to their 32-bit integer form and back, for database storage, range comparisons and reading …
- JWT Decoder Decode a JSON Web Token's header and payload to inspect its claims, expiry and algorithm — remembering that decodi…
- Image to Base64 Convert an image into a Base64 data URI for inlining in CSS or HTML, with a clear view of the size penalty that ma…
Build
Authoring helpers for the small pieces that are easy to get subtly wrong and expensive to debug later — a regex, a cron expression, a hash, a colour conversion.
- JSON Formatter Format and validate JSON to inspect an API response properly, and get a specific position for the syntax error rat…
- URL Parser Split a URL into scheme, host, port, path, query and fragment to debug routing, redirect chains and parameters tha…
- Regex Tester Test a regular expression against real input with live match highlighting and capture groups, before shipping a pa…
- Cron Expression Parser Translate a cron expression into a readable schedule with its next run times, before deploying something that fire…
- Hash Generator Generate cryptographic hashes to verify file integrity, compare content and produce checksums — with a clear note …
- HMAC Generator Generate HMAC signatures to validate webhook payloads and signed requests, and check your implementation against a…
- Colour Converter Convert colours between hex, RGB, HSL and named forms, and work with a representation that makes creating a consis…
- Aspect Ratio Calculator Calculate proportional width and height for any aspect ratio, and get the dimensions that let a browser reserve sp…