Web performance editor
Jonas builds and audits websites, which means spending most of his time on images that are too big and formats browsers disagree about. He writes about modern formats, page speed and the practical side of SVG, fonts and QR codes.
Writes about: web performance · image optimisation · Core Web Vitals
Instagram keeps profile pictures at 320 × 320 px and shows them as a 110 px circle on mobile. How to crop one that survives the circle, and how to save one at full size.
Jonas Weber · Oct 19, 2026 · 11 min read
Make a QR code by encoding a link, Wi-Fi login or contact as a static code, printing it at least 2 × 2 cm with a 4-module white border, and testing it on two phones first.
Jonas Weber · Oct 16, 2026 · 11 min read
Instagram sizes for 2025: posts 1080 × 1350 (4:5) or 1080 × 1080, landscape 1080 × 566, Stories and Reels 1080 × 1920 with a 250 px safe zone, profile photo 320 × 320.
Jonas Weber · Oct 7, 2026 · 11 min read
A PNG only becomes a real SVG through tracing. Learn which images trace well, how to prepare the PNG, which color and threshold settings to pick, and how to check the paths.
Jonas Weber · Oct 4, 2026 · 12 min read
Install TTF or OTF on Windows, macOS and Linux; serve WOFF2 on websites with WOFF as a fallback. What each font format holds, how big files run and what converting changes.
Jonas Weber · Sep 10, 2026 · 11 min read
Why saved images arrive as WebP, which apps and upload forms still reject it, when JPG or PNG is the right target, what converting costs, and how to get the original file.
Jonas Weber · Sep 8, 2026 · 11 min read
STL stores bare triangles, OBJ adds UVs and materials through an .mtl file, and 3MF packs units, color and print settings into one ZIP. Here is when each one is the right choice.
Jonas Weber · Sep 2, 2026 · 12 min read
WebP is for the web, HEIC for iPhone storage, AVIF for the smallest web photos. Compare compression, transparency, HDR, browser support in 2025 and when to convert.
Jonas Weber · Sep 1, 2026 · 11 min read