Blog

Notes on images and privacy.

Articles on what images reveal, Swiss data protection and the technology behind SchweizerIMG.

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What your photos reveal: EXIF, GPS and the data you don't see

Location, time, serial numbers and sometimes the uncropped original — what a photo file carries, and how to strip it before sharing.

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Image compression explained: compress images without losing quality

Lossy or lossless, quality 75 or 100, resize first or not: what really makes an image file small — and how to check nothing was lost.

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How to optimise images for your website: size, format, quality and loading

Right dimensions, modern formats with a fallback, sensible compression and lazy loading — a practical workflow for lighter pages.

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What is a HEIC file? Phone photos, compatibility and converting to JPG

Why phones save photos as HEIC, where the format causes trouble, and how to turn it into JPG, PNG or WebP.

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Photos of people in Switzerland: consent and the right to one's image

Team photos, events, children and crowds: how consent works in Switzerland, and how to make people unrecognisable when it is missing.

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What screenshots reveal: the details to check before you share

Message previews, tabs, e-mail addresses and file paths — what a screenshot gives away, and how to crop, blur and clean it.

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Adding author and copyright to photo metadata — without the location

Creator and copyright fields explained, written to a whole series at once — and why the location should go while your name stays.

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Watermarking photos: what a watermark protects — and what it doesn't

Attribution, deterrence, client proofs: what a visible mark achieves, where its limits are, and how to add your name to the file too.

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Pixels, DPI and print size explained: how big can you print a photo?

Pixels ÷ DPI × 2.54 = centimetres. The formula, a table for common print sizes and why 72 or 300 dpi changes no pixel.

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QR codes for businesses: create them well, scan them safely

Error correction, Wi-Fi and contact codes, redirect services and stickers on parking meters — what a business should know about QR codes.

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Favicon sizes explained: how to create a favicon and app icons that work

The files a modern website needs, a mark that reads at 16 pixels, the maskable safe zone and how to check the result in the browser.

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Animated GIFs today: where they work and how to make a GIF smaller

Newsletters, documentation, chat: where animated GIFs still earn their place, why they get heavy, and how to slim them down.

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Extracting a colour palette from an image for your brand or presentation

From a logo, a product shot or a mood picture to brand colours you can copy, export and check for readable contrast.

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Are free online image editors safe? What “free” can cost you

Ads, upselling, data use and licence clauses: what pays for a free image tool, and what to check before a photo leaves your device.

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How browser-based image editing works: inside the SchweizerIMG engine

Codecs compiled to WebAssembly, background workers, device memory and two tiny network requests: a look under the bonnet.

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