Blog
Guides on image compression, PDF tools, web performance, and privacy — written by engineers who build these tools.
Your Images Are Probably the Slowest Thing on Your Website
When a page feels slow, developers look at JavaScript first. The real bottleneck is almost always the media library. Here's how to diagnose and fix it.
Responsive Images: Stop Serving Desktop Photos to Phone Screens
A single <img> tag serving one resolution to every device is one of the most wasteful patterns on the web. srcset and sizes fix this in one step.
Shopify Image Optimization: What the Platform Does (and Doesn't Do) For You
Shopify serves WebP automatically and has a CDN — but it won't resize a 14MB banner or fix an unoptimised product grid. Here's what you still need to do manually.
Should You Trust Online Image Compression Tools With Your Photos?
Free online tools are convenient — but many upload your files to servers you know nothing about. How to verify whether a tool is actually safe.
Progressive JPEGs: The Forgotten Optimization That Still Matters
Progressive JPEG encoding makes images appear to load faster by showing a low-quality preview first. It's been around for decades but remains underused in 2026.
Lazy Loading Images: The One-Line Fix That Backfires on LCP
loading="lazy" on every image is one of the most common LCP killers. Here's why it happens and how to apply lazy loading correctly.
Lossy vs. Lossless Compression: The Difference That Actually Matters
Lossy and lossless solve different problems. Knowing which one to use — and when switching between them destroys quality — is the most important compression decision you'll make.
Image Optimization for E-Commerce: The Multi-Platform Reality
Product images on WooCommerce, Shopify, and Amazon all have different requirements. A practical guide to optimising once and deploying everywhere without quality loss.
What the JPEG Quality Slider Actually Does (It's Not What You Think)
Most people treat quality 80 as "80% of the original detail". That's not how JPEG works. Here's the actual DCT quantisation process behind the number.
Image Compression for People Who Just Want Smaller Photos
No technical jargon. A straightforward guide to making your photos smaller so they send faster, upload without errors, and stop clogging your storage.
Image Compression for Photographers: A Guide for People Who Actually Care About Quality
Export settings, generation loss, colour profile preservation, sharpening for web — the complete guide to compressing photos without compromising your work.
Those Weird Blotches Around Text: A Field Guide to Compression Artifacts
Ringing, blocking, banding, mosquito noise — compression artifacts have names and specific causes. Understanding them helps you compress without triggering them.
How Browsers Actually Handle Your Images
File size is only half the story. After the bytes arrive, browsers decode, rasterise, and composite images in ways that affect memory, battery, and rendering performance.
Choosing the Right Image Format: A Practical Guide From the Compression Side
JPEG, PNG, WebP, AVIF — each format has a different compression model. A practical guide to picking the right one so your fallback is never the weak link.
How to Compress an Image to an Exact File Size — And Why It's Harder Than You Think
Passport photos under 200 KB, CMS upload limits, email quotas — hitting an exact file size target requires binary search, not guesswork. Here's how.
How Client-Side Processing Saves Your Data (And Our Server Costs)
A transparent look at why ImagePDF.Tools processes files in the browser — the privacy case, the business case, and the engineering trade-offs.
Building a Private Image Compressor with WebAssembly
How ImagePDF.Tools uses pngquant WASM, the Canvas API, and Web Workers to compress images entirely in the browser — no server, no upload.
Converting PNG to WebP: Why Every Website Owner Should Do It
PNG files are 3–5× larger than their WebP equivalents. How to migrate your image library, what to watch out for, and when to keep PNG.
How to Batch Resize Images for Social Media Quickly
Every social platform has different image dimension requirements. The 2026 guide to resizing for Instagram, X, LinkedIn, and more — without losing quality.
5 Ways to Shrink a PDF for Email Attachments
Email attachment limits are typically 10–25 MB. Five techniques — from quick browser tools to CLI commands — for getting PDFs under the limit.
How to Convert JPG to PDF Without Losing Quality
Converting images to PDF often introduces double compression and quality loss. Here's how to do it right — preserving every pixel.
The Ultimate Guide to PDF Compression Levels
Screen, eBook, Printer, Prepress — what do these PDF compression presets actually mean? A technical breakdown of when to use each.
How to Pass Core Web Vitals with Optimized Images
Images are the single biggest contributor to LCP failures. A technical guide to diagnosing and fixing image-related Core Web Vitals issues.
WebP vs. AVIF: Which Image Format Is Best for SEO in 2026?
AVIF offers better compression than WebP, but encoder speed, CDN support, and browser compatibility all matter. The full 2026 comparison.
What Is Image Metadata? (And Why You Should Remove It Before Sharing)
Every photo you take contains hidden data: your GPS location, camera model, exact timestamp, and more. Here's what EXIF metadata is and how to strip it.
How to Safely Compress Sensitive PDF Documents
Bank statements, contracts, and medical records should never be uploaded to a third-party server. Here's how to compress them safely without leaving your device.
Why Online File Converters Are a Security Risk
Most free online file converters upload your files to remote servers. Here's what actually happens to your data — and how to stay safe.