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Guides to image formats, compression and the web
Practical, jargon-light explanations from the person who built the tools — what the formats actually do, which one to use, and how to make your images smaller without wrecking them.
Latest articles
Writing a real PNG compressor in vanilla JavaScript (no WASM, no libraries)
Median-cut quantization, Floyd–Steinberg dithering, hand-built PNG chunks, and the four browser traps that cost me an evening each.
07 October 2026 · 6 min read
Are online image converters safe? What actually happens to your files
Most converters upload your file to a server you know nothing about. Here's how to tell which ones do, and when it actually matters.
09 September 2026 · 6 min read
JPG vs PNG vs WebP vs AVIF: which image format should you use?
Five formats, one decision. Here's what each one is actually good at, with a rule of thumb you can apply in ten seconds.
09 September 2026 · 6 min read
How to combine multiple images into one PDF
Every method, on every device — plus the page-size and quality settings that decide whether your PDF is 200 KB or 20 MB.
09 September 2026 · 5 min read
How to make a favicon: every size and format you actually need
Which sizes you actually need, the exact HTML to paste, and the three reasons a favicon usually fails to appear.
09 September 2026 · 5 min read
How to reduce image file size without losing quality
Do these three things in the right order and a 4 MB photo becomes 80 KB with no visible difference. The order matters more than the tools.
09 September 2026 · 6 min read
What is a WebP file, and how do you open one?
Why the internet keeps giving you files you can't open, how to open them anyway, and when WebP is actually the right choice.
09 September 2026 · 5 min read