Development6 min read
PHP2Shell: Update PHP Now, Then Verify the Runtime Your Website Uses
PHP2Shell fixes, AI-assisted discovery, affected PHP branches and a practical update checklist—including the latest October 23 and 26 follow-up notices.
THE KNOW-HOW
Useful tools.
Even better with context.
Clear explanations, practical examples, and a few shortcuts worth knowing. A growing library for people who like getting things done.
45 guides on development, files, and everyday workflowsOpen the toolbox
Development4 min read
How to Verify Webhook Signatures in Node.js Without Breaking the Raw Body
Build and test a GitHub-style HMAC verifier, preserve the original payload bytes, and handle duplicate deliveries without confusing signatures with freshness.
Development4 min read
Why JSON Changes Large IDs in JavaScript—and How to Keep Them Exact
Reproduce large-integer rounding, design a string-based ID contract, and avoid losing digits when parsing, formatting or serializing JSON.
Development4 min read
How to Verify a SHA-256 Download Checksum on Windows, Mac and Linux
Check a downloaded file with built-in commands, reproduce a known digest, and understand what a matching checksum does and does not prove.
Development9 min read
How to Format JSON Online Quickly and Securely
Learn how to format JSON online quickly and securely using tools that protect your sensitive API data while instantly turning messy strings into readable code.
Discord3 min read
Discord Permission Flags Reference: Decimal Values, Bits and BigInt
Look up Discord permission flags by API name, bit, decimal value and hex, with correct worked combinations and BigInt examples.
AI3 min read
Best AI Tools for Developers in 2026: Claude, ChatGPT, Gemini, and More
Which AI actually helps developers ship faster? Honest breakdown of Claude Code, GitHub Copilot, Cursor, and Gemini for real coding workflows in 2026.
AI4 min read
ChatGPT vs Claude vs Gemini: Honest Comparison for 2026
Tested all three on writing, coding, reasoning, and long documents. Here's what actually differs between ChatGPT, Claude, and Gemini in 2026 — and which one to use for what.
AI4 min read
AI Token Limits Explained: GPT-4o vs Claude vs Gemini Context Windows (2026)
What are tokens, why do they matter, and how do GPT-4o (128K), Claude Sonnet (200K), and Gemini 2.5 Pro (1M) compare? Practical guide to picking the right model for your context window needs.
Discord6 min read
Discord Timestamp Format Codes: All 7 Styles Explained (With Free Generator)
Everything you need to know about Discord's 7 timestamp format codes — what each one renders, when to use them, and how to generate tags without doing Unix math.
Discord3 min read
How Discord Permission Integers Work: Bitfields, Invites and Overrides
Understand Discord permission math, build a bot invite, and diagnose channel overwrites without confusing a role bitfield with effective permissions.
Discord5 min read
How to Create a Discord Embed Without a Bot (Using Webhooks + Free Builder)
You do not need a bot to send styled Discord embeds. Learn how to create webhooks and use our free embed builder to send professional-looking messages to any channel.
Discord6 min read
Discord Webhook Testing: How to Send & Debug Messages Without Writing Code
Have a Discord webhook URL and want to test it? Learn how to send messages, diagnose common errors, and debug webhook integrations without writing a single line of code.
Development4 min read
How to Convert CSV to JSON Online for Free
Need to convert a CSV file to JSON? Here's how to do it instantly in your browser — no coding, no Excel, no signup required.
Images & files4 min read
How to Resize an Image Without Photoshop
Photoshop costs $55/month to resize an image. Here are 3 ways to do it free in seconds — in your browser, no software, no account required.
Images & files3 min read
How to Compress a PDF for Free Without Adobe
Choose a practical method for an existing PDF on Mac or Windows, or create a smaller PDF from source images. Understand what splitting and merging can do.
Development5 min read
Conventional Commits: Complete Team Setup Guide (commitlint + Husky + semantic-release)
Set up commitlint and Husky with a correctly quoted commit-msg hook, then configure release analysis and check the workflow in CI.
Development4 min read
How to Undo a Git Commit: The Right Command for Every Scenario
The right git undo command depends on whether you've pushed yet and whether you want to keep your changes. A clear decision tree plus copy-paste commands for every scenario.
Images & files4 min read
How to Create a QR Code Without an Account (Free, Unlimited)
Most QR code generators track your scans, expire your codes, or charge monthly fees. Here's how to generate QR codes that are yours forever — no account needed.
Images & files4 min read
Free Background Remover: Why You Shouldn't Have to Pay for This
Remove.bg charges per image. Canva locks it behind Pro. The AI to remove backgrounds has been open source for years — here's how to do it free, with no account, directly in your browser.
Development4 min read
How to Create a Professional Invoice Free Without Word or Excel
You don't need Microsoft Office, FreshBooks, or QuickBooks to send a professional invoice. Here's how to create one free in under 2 minutes.
Images & files3 min read
How to Remove an Image Background Without Photoshop or Canva
Photoshop costs $55/month. Canva charges for background removal. Here's how to do it free in seconds — AI runs in your browser, nothing uploaded.
Development6 min read
GitFlow vs Trunk-Based Development: Which Should You Use?
Compare integration, release support and branch lifetimes to choose a workflow. Includes diagrams, practical scenarios and the limits of each approach.
Images & files3 min read
How to Merge PDFs Free Without Adobe Acrobat
Adobe Acrobat charges $20/month to merge PDFs. Here's how to do it instantly for free — no software, no account, no catch.
Development4 min read
Web Performance Optimization: The Complete 2026 Guide for Developers
Core Web Vitals, lazy loading, image compression, minification — everything you need to make your site blazing fast and rank higher on Google.
Development4 min read
HTTPS, SSL Certificates and Web Security Basics Every Developer Should Know
From SSL/TLS and HTTPS to CSP headers, password hashing and JWT tokens — a practical web security primer for developers building production apps.
Development4 min read
The Developer's Guide to Encoding: Base64, URL Encoding, and Unicode Explained
Why does 'hello world' become 'hello%20world' in a URL? What is Base64 actually for? A practical guide to encoding for web developers.
Development4 min read
REST API Design Best Practices: A Practical Guide for 2026
Resource naming, HTTP status codes, versioning, authentication, pagination — the REST API design decisions that separate good APIs from great ones.
Development3 min read
Git Branching Workflow Examples: Features, Releases and Hotfixes
Practical Git commands for feature branches, release stabilization and hotfixes, with the steps that keep fixes from being lost.
Development4 min read
Understanding Cron Jobs: Scheduling Tasks on Linux Servers
Learn how cron syntax works, common scheduling patterns, and how to avoid the mistakes that make cron jobs fail silently on production servers.
Development4 min read
How to Write Better README Files: The Developer's Documentation Guide
A great README is the difference between a project people use and a project people ignore. Here's what to include, how to structure it, and what to avoid.
Development4 min read
Lorem Ipsum Generator: Placeholder Text for Designers and Developers
Understand the origin of Lorem Ipsum, when to use placeholder text, alternatives for different contexts, and how to generate it instantly online.
Development4 min read
Unix Timestamp Converter: Epoch Time to Human Date Explained
Understand Unix timestamps, epoch time, and timezone handling. Convert timestamps to human-readable dates and debug time-related bugs with ease.
Development4 min read
Diff Checker Online: Compare Two Texts and Find Differences Fast
Learn how text diff algorithms work, when to use a diff checker, and how to compare two pieces of text or code online in seconds with a free tool.
Development4 min read
Meta Tags Generator: Get SEO and Open Graph Tags Right
Learn which meta tags actually matter for SEO, how Open Graph and Twitter Card tags work, and how to generate them correctly for any page.
Development4 min read
JWT Decoder Online: Inspect and Debug JWT Tokens Instantly
Learn how to decode JWT tokens, understand their structure, verify claims, and debug authentication issues. Free online JWT inspector with no data stored.
Development4 min read
URL Encoder/Decoder Online: Percent Encoding Explained
Master URL encoding and percent encoding. Learn why URLs need encoding, which characters are reserved, and how to encode/decode URLs online instantly.
Development4 min read
Strong Password Generator: Create Secure Random Passwords Online
Understand what makes a password truly secure, how random password generators work, and why you should never create passwords manually again.
Images & files4 min read
QR Code Generator: Create QR Codes Free Online in Seconds
Learn how to create QR codes free online for websites, Wi-Fi, vCards, and more. No app required — generate and download instantly.
Images & files4 min read
The Ultimate Guide to Image Compression: How to Speed Up Your Site with Our Free Tool
Boost website speed instantly! Learn how to reduce image size with our free, privacy-focused online image compressor. No signup required.
Development7 min read
Regex Tester: Test, Validate, and Debug Regular Expressions Online (Free, Fast, Private)
Free, fast regex tester online to test and validate patterns locally in your browser—no signup, no data stored, privacy-first debugging.
Development5 min read
Secure Online Hash Generator: Create MD5, SHA-1, SHA-256 & SHA-512 Instantly
Instantly generate MD5, SHA-1, SHA-256, and SHA-512 hashes. A free, client-side online tool with no signup required. 100% secure and runs in your browser.
Development5 min read
Boost Your Website Speed: The Ultimate Guide to Using a CSS Minifier
Speed up your website instantly with a free CSS minifier. Learn how to minify CSS, reduce file sizes, and improve SEO without any signup required.
Development3 min read
Base64 Encoding Explained: When to Use It (and When to Avoid It) for Web Speed
Is Base64 making your website slower? Discover the pros and cons of Base64 encoding for images and data, and learn how to use encoders safely for modern web development.
Development3 min read
How to Debug and Format JSON: The Ultimate Developer’s Guide for 2025
Struggling with "Unexpected token" errors? Learn the best practices for formatting, validating, and debugging JSON data instantly using professional web tools.
Metin2 guides 12 articles
Metin2 Private Server: How to Add a Custom Hairstyle (Complete Guide) Metin2 Private Server: How to Add a Custom Weapon (Complete Guide) Metin2 Private Server: How to Add a Custom Costume or Armor (Complete Guide) Metin2 Private Server: How to Add a Custom NPC (Step-by-Step) Metin2 Private Server: How to Add a Custom Boss Monster Metin2 Quest Scripting Guide: How Dungeon Quests Work (With Examples) Metin2 .msm Files Explained: HairData, ShapeData and How to Add Costumes Metin2 Quest Files: Where They Go, How They Load, and Common Errors How to Set Up a Metin2 Private Server in 2026: Complete Admin Checklist Metin2 item_proto.txt Complete Column Reference: Every Field Explained Metin2 mob_proto.txt Complete Reference: Stats, Ranks, Resistances and Boss Abilities Explained Metin2 Drop Rate Explained: How PCT Values Really Work in mob_drop_item.txt