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Engineering guides on image compression, PDF tools, web performance, and zero-upload file privacy.
Technical: 13 articles
Chroma Subsampling Explained: Why Some JPEGs Blur Thin Red Text and Fine Lines
Notice blurred colored text in a sharp JPEG? That's chroma subsampling, a hidden compression trick most quality sliders never mention or expose to you.
Why Your PNG Gets a White Background When You Convert It to PDF (and How to Fix It)
Convert a transparent PNG to PDF and get a solid white box instead? PDF has no native alpha channel like PNG. Here's why it happens and how to fix it.
sRGB vs Adobe RGB: Why Your Photos Look Dull the Moment You Upload Them
Edit in Adobe RGB and your photos can look dull the moment they're uploaded, since the web assumes sRGB. Here is the one export setting that fixes it.
Browser-Based PDF Tools: What They Are and Why They Work Differently
What are browser-based PDF tools, and how are they different from the upload-based converters most people are used to? Here is how the architecture works, and where to find them.
DPI vs PPI Explained: Why a "300 DPI" Image Looks Fine Online but Blurry When Printed
DPI and PPI measure different things, and mixing them up is why sharp on-screen images print blurry. Here is the actual difference, explained clearly.
What Makes an Image Converter Actually Secure (It Is Not Just About Uploads)
A secure image converter is about more than whether it uploads your file. Malicious SVGs, decompression bombs, and crafted metadata are real risks, here is how they work and how to avoid them.
Lossy vs. Lossless Compression: The Difference That Actually Matters
Lossy trades quality for size; lossless trades size for perfect fidelity. Pick the wrong one and you're wasting bandwidth or permanently degrading your assets.
What the JPEG Quality Slider Actually Does (It's Not What You Think)
Quality 80 is not "80% of the original". It's a quantisation table scalar. Here's how the DCT-based encoding actually works and what settings to use.
How Browsers Actually Handle Your Images
File size is half the story. After bytes arrive, browsers decode and composite images in ways that affect memory and rendering. Here's what actually happens.
Those Weird Blotches Around Text: A Field Guide to Compression Artifacts
Blotchy gradients, halos around text, pixelated blocks, compression artifacts have specific names and causes. Learn what triggers each one and how to avoid them.
Choosing the Right Image Format: A Practical Guide From the Compression Side
JPEG, PNG, WebP, or AVIF? This practical guide explains every format's compression model so you pick the right one every time. Free converter included.
How Client-Side Processing Saves Your Data (And Our Server Costs)
When a browser tool processes your files locally, your data never leaves your device. A transparent look at the privacy, business, and engineering case for client-side processing.
Building a Private Image Compressor with WebAssembly
How ImagePDF.Tools uses UPNG.js, MozJPEG and libwebp compiled to WebAssembly, and Web Workers to compress images entirely in the browser, zero server uploads, full privacy.