Free Developer Tools

Free, browser-based tools for developers — nothing to install, nothing sent to a server unless noted.

Each tool on this page runs entirely in JavaScript, in your own browser tab. There's no upload step, no account, and no waiting on a server round-trip — input stays on your machine unless a tool's own description says otherwise. That makes them safe to use with real passwords, real API keys, or real customer data when you're debugging something, since nothing leaves the page. It also means the tools keep working offline once the page has loaded, and there's no rate limit or usage cap to run into.

This started as a handful of one-off scripts I kept rewriting for myself — a password generator here, a JSON formatter there — and turned into a small toolbox once it was clear other developers hit the same small, recurring problems. Nothing here is trying to be a full product; each tool does one job, does it in the browser, and gets out of the way. The Laravel reference section below grew out of the same instinct: notes I kept re-deriving from official docs and past projects, written down once so they're quicker to check than to re-Google.

Security tools

Password generation, password strength checking, hashing, and JWT decoding all involve sensitive input, so these run client-side by design — a generated password, a string you're hashing, or a token's secret never crosses the network. The password checker's breach lookup is the one exception worth knowing about: to check whether a password has appeared in a known leak it needs to query an external database, and it does this using a k-anonymity approach so your full password (or even a full hash of it) is never transmitted.

Data & text tools

JSON viewing, CSV conversion, Base64 encoding, case and slug conversion, UUID generation, URL encoding, timestamp conversion, cron parsing, regex testing, and colour conversion are the kind of small transforms that come up constantly during day-to-day development — pasting a response body to check its shape, converting an export for a spreadsheet, or double-checking a schedule before it ships. These are fast, stateless operations, so keeping them client-side avoids the overhead of a server request for what's essentially a single function call.

Password Generator

Create strong, random passwords with full control over length, character sets, and rules like no repeats.

Password Checker

Check a password's strength, estimated crack time, and whether it's appeared in a known data breach.

Hash Generator

Hash text, JSON, or files with MD5, SHA-1, SHA-256, SHA-384, or SHA-512, checked and saved automatically.

Hash Lookup

Paste a hash to see if it's already known, and which algorithm produced it.

JWT Decoder

Decode a JWT's header and payload, and optionally verify an HMAC signature locally.

API Key Generator

Generate random API keys or secrets in hex, base64url, UUID-like, or a custom prefixed format.

SSL Certificate Checker

Check a domain's TLS certificate, its expiry, and its subject alternative names.

CSP Header Builder

Build a Content-Security-Policy header interactively, directive by directive.

.htpasswd Generator

Generate a bcrypt or SHA1 .htpasswd line for Nginx or Apache Basic Auth.

TOTP Generator

Generate live 6-digit TOTP codes from a Base32 secret, for testing 2FA integrations.

JSON Viewer

Paste raw JSON and browse it as a collapsible, syntax-highlighted tree so structure and values are easy to spot.

CSV / JSON Converter

Convert between CSV and JSON in either direction, with proper handling of quoted fields.

Base64 Encoder / Decoder

Convert text to and from Base64 instantly, entirely in your browser.

Case Converter

Convert text between camelCase, PascalCase, snake_case, kebab-case, Title Case, and more.

UUID Generator

Generate random v4 UUIDs one at a time or in bulk, with optional hyphens and casing.

Slug Generator

Turn a title or heading into a clean, URL-safe slug, with control over separator, case, and length.

URL Encoder / Decoder

Percent-encode or decode text and URLs, with a choice between component and full-URL encoding.

Timestamp Converter

Convert between Unix timestamps and human-readable dates, in your local timezone or UTC.

Cron Parser

Translate a cron expression into plain English and see its next scheduled run times.

Regex Tester

Test a regular expression against sample text with live match highlighting and capture groups.

Colour Converter

Convert colours between Hex, RGB, and HSL, with a live picker, preview, and alpha channel.

Colour Palette Generator

Pick a colour and get several palettes of colours that go well with it — complementary, analogous, triadic, and more.

Markdown Previewer

Write Markdown on one side and see the rendered HTML update live on the other.

Diff Checker

Compare two blocks of text line by line, with additions and removals highlighted.

Lorem Ipsum Generator

Generate placeholder text by paragraph, sentence, or word count.

HTML Entity Encoder / Decoder

Encode text to HTML entities or decode entities back to plain text.

YAML / JSON Converter

Convert between YAML and JSON in either direction.

String Escape / Unescape

Escape or unescape a string for JSON, SQL, or shell.

Number Base Converter

Convert a number between binary, octal, decimal, and hexadecimal live.

Laravel Reference

Quick reference notes for the Laravel framework.

Each page below covers one area of Laravel — routing, Eloquent, middleware, validation, and so on — with runnable code examples rather than prose-heavy explanations. They're written as the kind of page you'd want open in a second tab while working: enough context to remember why a feature exists, plus the exact syntax, so you don't have to dig through the full framework documentation for something you've used before but forgotten the details of.