Foldrix Blog
Practical guides on AI tools, image conversion, PDF handling and developer utilities. No filler, no fluff.
AI Guides — 6 articles
ChatGPT vs Claude vs Gemini (2025): Which Free AI Is Best?
We tested the three biggest AI chatbots side by side. Here is which one wins for writing, coding, research and everyday use.
10 minBest Free AI Tools in 2025 (Tested & Ranked)
The 30 best free AI tools we actually use — chatbots, image generators, code assistants, video editors and transcription.
7 min15 Best Free ChatGPT Alternatives in 2025
Looking for a free ChatGPT alternative? These 15 AI chatbots offer generous free tiers — some without needing an account.
9 minHow to Use AI for Writing Without Sounding Like AI (2025)
A practical guide to using ChatGPT, Claude and Gemini for writing without the robotic tone everyone recognizes.
11 minHow to Write Better AI Prompts: The Complete 2025 Guide
Stop getting mediocre AI output. Learn the prompt engineering techniques top AI users rely on, with 20 templates.
7 minFree AI Video Generators in 2026: What You Actually Get for $0
We compared the free tiers of the biggest AI video tools — what they let you make, what the catch is, and which one fits your project.
Image Guides — 4 articles
How to Compress Images Without Losing Quality (2025)
A practical guide to reducing image file sizes for faster websites and easier sharing — without sacrificing visible quality.
7 minPNG vs JPG vs WebP: Which Image Format Should You Use?
The complete 2025 guide to image formats — when to use PNG, JPG, WebP, AVIF or SVG.
6 minHow to Remove Background from an Image Free (2025)
No Photoshop? No problem. The fastest ways to remove image backgrounds for free — including AI-powered tools with no signup.
5 minImage Sizes for Social Media in 2025 (Cheat Sheet)
Every image dimension you need for Instagram, TikTok, Facebook, X, LinkedIn, YouTube and Pinterest — updated for 2025.
PDF Guides — 3 articles
How to Merge PDF Files for Free (No Watermark, No Signup)
A step-by-step guide to combining multiple PDFs into one document — free, without watermarks, and without uploading to a random server.
5 minHow to Split a PDF into Separate Files (Free Guide)
Extract specific pages, split every page into its own file, or pull a range — without paying for Adobe Acrobat.
5 minPDF vs DOCX: When to Use Each Format
PDFs and Word documents solve different problems. This guide explains which to use for contracts, resumes, reports and sharing.
Productivity Guides — 3 articles
How to Create a QR Code for Free (2025 Guide)
Generate free, high-resolution QR codes for websites, Wi-Fi, vCards and payments — no watermark, no expiration.
6 minHow to Create a Strong Password You Can Actually Remember
Practical password advice that actually works — no pseudo-science, no "change it every 90 days" nonsense.
6 minHow Many Words Should Your Content Be? (SEO Data 2025)
Real data on ideal word counts for blog posts, landing pages, product pages, meta descriptions and social media.
Developer Guides — 6 articles
How to Generate a UUID (Complete 2025 Guide)
What UUIDs are, why v4 is the safest version, and how to generate them in JavaScript, Python, PHP, Java, Go and Rust.
7 minBase64 Encoding Explained (With Real Examples)
What Base64 is, why it exists, where it is used, and when you should never use it.
6 minMD5 vs SHA-256: Which Hash Should You Use?
MD5 is broken for security but still useful for checksums. SHA-256 is the modern default.
6 minJSON vs XML in 2025: Which Data Format to Use
An honest comparison of JSON and XML — speed, readability, tooling, validation, and where each still makes sense.
5 minUnix Timestamps Explained (Complete Guide)
What Unix time is, why it is counted from 1970, how to convert it, and why it will eventually have a Year 2038 problem.
6 minWhat Is a JWT? How to Decode One (Free, No Signup)
What a JSON Web Token actually contains, how to decode one, and why decoding is not the same as verifying it.
Utility Guides — 3 articles
How to Convert PNG to JPG Free (Fast & Private)
A quick guide to converting PNG images to JPG — when to do it, why file size drops by 60-90%, and how to do it without uploading.
4 minHow to Convert JPG to PNG Free (Lossless, No Upload)
Convert JPG photos to lossless PNG format in your browser — no signup, no upload, no watermark.
5 minQR Code Best Practices for Print & Marketing (2025)
How to design QR codes that actually get scanned — size, contrast, placement, error correction.