Blog — CachePlex

Social Sharing New 9 min read 11 Oct 2026

Link Preview Showing the Wrong Image? How to Clear the Cache on Every Platform

You changed the og:image and the old one still appears. That is caching, not a tagging problem. Here is how to force a refresh on Facebook, LinkedIn, X, Slack and Discord.

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Technical SEO New

Search Console Says “Couldn’t Fetch” Your Sitemap: What Each Error Means

Couldn’t fetch, could not be read, general HTTP error, 0 discovered URLs — each means something different. What causes each one, and how to fix it.

Technical SEO New

How to Run an SEO Audit on Your Own Site in Under an Hour

Most audits fail because they start in the wrong place. Work in dependency order — crawlable, indexed, on-page, technical, content — and an hour is enough.

Photo Conversion New

Why Won’t HEIC Photos Open on Windows? Three Fixes That Actually Work

Windows cannot read iPhone HEIC photos out of the box. Convert them, install the codec, or stop the iPhone making them — with the trade-offs of each.

Email Deliverability New

Why Are My Emails Going to Spam? The Six Real Causes (and How to Fix Each)

Emails landing in junk is almost never your subject line. It is usually SPF, DKIM or DMARC — including the 10-lookup limit that breaks SPF silently. Here is how to find which one, and fix it.

Web Security New

“Your Connection Is Not Private”: What It Means and How to Fix It

Expired certificate, name mismatch, broken chain or just a wrong clock? Read the error code, work out whose problem it is, and fix the one that actually applies.

App Development New

App Store Connect Won’t Accept Your Screenshots? Every Reason It Happens

Screenshot dimensions rejected, wrong display size tab, missing iPad set, transparency and colour space. Every cause of a failed App Store screenshot upload, and the fix for each.

App Marketing New

What to Put on Your App Store Screenshots (and What to Leave Off)

Captions that convert, how many screenshots to use, device frames, the Play feature graphic, and the things that get a listing rejected. A practical guide for indie developers.

PDF Tools New

How to Convert JPG to PDF (and Combine Multiple Photos Into One PDF)

Convert JPG to PDF and combine several photos into one file. Page order, sideways photos, A4 vs Letter, and how to shrink a PDF that is too big to upload.

Image Resizing New

How to Resize an Image to 50KB, 100KB or Any File Size

Shrink a photo under an upload limit like 20 KB, 50 KB or 100 KB without making it blurry. The difference between KB, pixels and DPI, with tested results.

Photo Editing New

How to Remove the Background From a Photo for Free (and Get Clean Edges)

Remove a photo background for free, then fix the edges: halos, shadows and missing parts. When to use a transparent PNG or a white background.

Photo Conversion New

How to Convert Multiple iPhone HEIC Photos to JPG at Once

Batch convert iPhone HEIC photos to JPG in minutes. Why HEIC causes compatibility problems, which quality to choose, what happens to file size and metadata, and how to fix files that will not convert.

Social Sharing New

Why Is My WhatsApp Link Preview Image Not Showing? How to Check and Fix It

WhatsApp link preview missing its image, showing the wrong one, or stuck on an old version? Follow this step-by-step check of your Open Graph tags, share image and caches to fix it.

Website Performance

How to Reduce Image File Size Without Losing Quality

Reduce website image file sizes without visible quality loss. Learn when to resize, compress, or convert to WebP, plus the mistakes that make images blurry.

Marketing Analytics

How to Create UTM Tracking Links for GA4

Build clean UTM tracking links for Google Analytics 4. See source, medium, campaign, and content examples plus a naming system that prevents messy reports.

On-Page SEO

How to Write SEO Meta Tags for Hundreds of Pages Fast

Writing unique meta titles and descriptions for a large website is a nightmare. Discover how to bulk generate perfectly optimized SEO meta tags in minutes.

Off-Page SEO

How to Find Competitor Backlinks and Steal Their SEO Strategy

Your competitors are ranking above you because of their backlink profile. Learn how to check competitor backlinks and uncover easy link-building opportunities.

Content Creation

How to Make AI Text Sound Human, Natural, and Undetectable

AI writing often sounds robotic, repetitive, and lacks emotion. Here is a practical guide to humanizing AI-generated content so it engages readers and bypasses detectors.

Social Media

What Size Should Social Media Post Images Be? A Straight Answer

Forget memorising a pixel table for every platform. There are really only four shapes that matter, and this guide covers what each one is for, what gets cropped, and how to stop guessing before you post.

Social Media

How to Make Social Media Graphics When You Are Not a Designer

You do not have bad taste — you have too many decisions. Here is a practical workflow for making social posts that look deliberate, without learning design software or hiring anyone.

Social Media

How to Make Quote Graphics for Instagram Free (No Photoshop Needed)

Quote posts are the easiest graphics to make and the easiest to make badly. Here is how to pick a quote that works visually, set it so it reads at thumbnail size, and batch a month of them for free.

Technical SEO

How to Check If a Website Has Schema Markup (Free, No Code Needed)

You do not need to read source code to see a page's structured data. Here is how to check any URL for schema markup in seconds, read the results, and act on what you find.

SEO

How to Write Meta Titles and Descriptions in Bulk (Without Losing a Weekend)

Writing meta tags for one page is easy. Writing them for two hundred is a slog. Here is a faster, saner way to generate optimized titles and descriptions in bulk.

SEO

How to Fix Duplicate Meta Descriptions (and Actually Keep Them Unique)

Duplicate meta descriptions are one of the most common SEO warnings, and one of the easiest to fix. Here is how to find them, fix them, and stop them coming back.

On-Page SEO

10 On-Page SEO Mistakes That Are Silently Killing Your Rankings

You could have brilliant content and still rank on page 3. These ten fixable on-page errors are the most common reason well-written pages never reach page one.

On-Page SEO

How to Write Meta Descriptions That Actually Get Clicked

Your meta description is your organic ad copy. Here's the formula for writing descriptions that drive clicks, improve CTR, and bring more qualified traffic to your pages.

On-Page SEO

Title Tag Optimization: The Complete Guide for 2025

The title tag remains the most influential on-page SEO element you can control. This guide covers length, format, keyword placement, and every edge case — with real examples.

Technical SEO

Why HTTPS Is No Longer Optional: The Impact on SEO and User Trust

HTTPS became a Google ranking signal in 2014. In 2025, a site without it triggers browser warnings, destroys conversion rates, and sends a negative trust signal no business can afford.

Technical SEO

Structured Data Explained: How to Unlock Rich Snippets in Google Search

Rich snippets — star ratings, FAQs, breadcrumbs, recipes — dramatically improve click-through rates. This guide explains Schema.org structured data, JSON-LD, and exactly how to implement it.

Digital Tools

How to Create QR Codes for Free: A Complete Guide for Businesses

QR codes are one of the most powerful — and underused — tools in digital marketing. Here's everything you need to know, plus a free generator to create yours instantly.

Web Design

How to Create a Favicon for Your Website (Free, No Design Skills Needed)

That tiny icon in the browser tab is doing more for your brand than you think. Here's what a favicon is, why it matters, and how to create a complete favicon package free.

Technical SEO

What Is robots.txt and How to Check It for SEO Issues (Free Tool)

Your robots.txt file controls which pages search engines can crawl — one wrong line can accidentally block your entire site. Here's everything you need to know, plus a free checker tool.

Technical SEO

How to Check SSL Certificate Expiry and Security Grade

Check an SSL certificate’s expiry, hostname coverage, SANs, issuer, key, signature, and chain—then diagnose common browser warnings step by step.

App Development

How to Create App Icons for iOS and Android (Free Tool)

Learn how to generate all required app icon sizes for iOS and Android from a single image. No design skills needed — just upload and download your ZIP in seconds.

AI Tools

How to Detect AI-Generated Content (Free Tool Included)

AI-written content is everywhere — but how do you actually tell? Learn how AI detectors work, what signals they look for, and how to check any text for free in seconds.

Content Writing

Readability Scores Explained: Flesch, FK Grade, and Why They Matter for SEO

A Flesch Reading Ease of 72. A Flesch-Kincaid Grade of 8. What do those numbers actually mean — and how do they affect your rankings and conversions? Here's the complete guide.

AI Tools

How to Make ChatGPT Sound More Human

ChatGPT writes fast — but it doesn't write like you. Here's a practical guide to getting output that sounds like a real person, not a language model trying too hard.

AI Tools

How to Humanize ChatGPT Content

AI-generated content fails when it sounds AI-generated. Here's a practical, step-by-step guide to humanizing ChatGPT output — so it reads naturally, ranks better, and actually converts.

AI Tools

How to Make AI-Generated Content Read Like a Human Wrote It

AI content is efficient. But efficient doesn't mean effective. Here's a complete guide to transforming machine-generated text into writing that feels genuinely, unmistakably human.

Want to get more from your content?

Run a free SEO scan, humanize your AI content, or check your site's SSL — all free tools, no sign-up needed.

Free SEO Scan AI Humanizer

Practical Guides.No Fluff.

Link Preview Showing the Wrong Image? How to Clear the Cache on Every Platform

Search Console Says “Couldn’t Fetch” Your Sitemap: What Each Error Means

How to Run an SEO Audit on Your Own Site in Under an Hour

Why Won’t HEIC Photos Open on Windows? Three Fixes That Actually Work

Why Are My Emails Going to Spam? The Six Real Causes (and How to Fix Each)

“Your Connection Is Not Private”: What It Means and How to Fix It

App Store Connect Won’t Accept Your Screenshots? Every Reason It Happens

What to Put on Your App Store Screenshots (and What to Leave Off)

How to Convert JPG to PDF (and Combine Multiple Photos Into One PDF)

How to Resize an Image to 50KB, 100KB or Any File Size

How to Remove the Background From a Photo for Free (and Get Clean Edges)

How to Convert Multiple iPhone HEIC Photos to JPG at Once

Why Is My WhatsApp Link Preview Image Not Showing? How to Check and Fix It

How to Reduce Image File Size Without Losing Quality

How to Create UTM Tracking Links for GA4

How to Write SEO Meta Tags for Hundreds of Pages Fast

How to Find Competitor Backlinks and Steal Their SEO Strategy

How to Make AI Text Sound Human, Natural, and Undetectable

What Size Should Social Media Post Images Be? A Straight Answer

How to Make Social Media Graphics When You Are Not a Designer

How to Make Quote Graphics for Instagram Free (No Photoshop Needed)

How to Check If a Website Has Schema Markup (Free, No Code Needed)

How to Write Meta Titles and Descriptions in Bulk (Without Losing a Weekend)

How to Fix Duplicate Meta Descriptions (and Actually Keep Them Unique)

10 On-Page SEO Mistakes That Are Silently Killing Your Rankings

How to Write Meta Descriptions That Actually Get Clicked

Title Tag Optimization: The Complete Guide for 2025

Why HTTPS Is No Longer Optional: The Impact on SEO and User Trust

Structured Data Explained: How to Unlock Rich Snippets in Google Search

How to Create QR Codes for Free: A Complete Guide for Businesses

How to Create a Favicon for Your Website (Free, No Design Skills Needed)

What Is robots.txt and How to Check It for SEO Issues (Free Tool)

How to Check SSL Certificate Expiry and Security Grade

How to Create App Icons for iOS and Android (Free Tool)

How to Detect AI-Generated Content (Free Tool Included)

Readability Scores Explained: Flesch, FK Grade, and Why They Matter for SEO

How to Make ChatGPT Sound More Human

How to Humanize ChatGPT Content

How to Make AI-Generated Content Read Like a Human Wrote It

Want to get more from your content?

Practical Guides.
No Fluff.