Image guides
How image formats, compression, colour and metadata actually work — written to be useful whether or not you ever use a tool on this site.
Formats
8 guides- Formats · 6 min read PNG vs JPG vs WebP vs AVIF: which format should you actually use? PNG, JPG, WebP or AVIF? What each format is good at, what it costs you, real file-size numbers, and which to pick for photos, logos and transparency. Read the guide
- Formats · 6 min read How image compression actually works What lossy compression does to your pixels, why quality 80 looks identical to 100, and how to hit a target file size without visible damage. Read the guide
- Formats · 5 min read How transparent backgrounds actually work What an alpha channel is, why cut-outs get white or black fringes, straight vs premultiplied alpha, and which formats carry transparency at all. Read the guide
- Formats · 6 min read Why your photo looks different on every screen sRGB, Display P3 and Adobe RGB, what an embedded colour profile does, why exported images sometimes look washed out or oversaturated, and what to use where. Read the guide
- Formats · 7 min read HEIC: why your iPhone photos will not open anywhere else Why iPhones save photos as HEIC, what the format actually does, which devices refuse it, and how to convert to JPG without throwing away quality. Read the guide
- Formats · 6 min read Why QR codes fail to scan, and how to make ones that always do How QR codes really work, the minimum size for a given distance, why low contrast and inverted colours break scanning, and what error correction buys you. Read the guide
- Formats · 6 min read Favicons: which sizes and files you actually need in 2026 What a favicon set really requires — ICO versus PNG versus SVG, Apple touch icons, maskable PWA icons, dark mode, and the HTML that ties them together. Read the guide
- Formats · 6 min read GIF vs video: why GIFs are so big, and when one is still the right answer Why a three-second GIF can be larger than a minute of video, what GIF's 256-colour limit really costs, and how to decide between GIF, MP4 and WebP. Read the guide
Editing
3 guides- Editing · 5 min read How to resize images without losing quality What resampling actually does, why downscaling is safe and upscaling is not, which algorithm to pick, and the honest limits of AI upscalers. Read the guide
- Editing · 5 min read The right image size for every social platform Current dimensions and aspect ratios for Instagram, X, LinkedIn, Facebook, YouTube, TikTok and Pinterest — plus how to lose the least quality. Read the guide
- Editing · 6 min read How to make stickers that actually work in WhatsApp and Telegram The real technical rules for WhatsApp and Telegram stickers — 512x512, the 100 KB cap, why transparency matters, and how to make one from a photo. Read the guide
Photography
2 guides- Photography · 6 min read How to photograph products for Amazon, eBay and Etsy What marketplace image rules require, how to light a product with two lamps and a sheet of paper, and the shot list that converts — no studio needed. Read the guide
- Photography · 6 min read How to photograph anything for a clean cut-out Background removal quality is decided when you take the photo. What separates edges cleanly, why hair and glass are hard, and how to shoot for it. Read the guide
Privacy
3 guides- Privacy · 5 min read What EXIF data reveals about you, and how to remove it Every photo carries hidden metadata: GPS coordinates, serial numbers, timestamps. What is in there, which platforms strip it, and how to remove it. Read the guide
- Privacy · 5 min read How to redact a screenshot safely Blur and pixelation have both been reversed in real cases. What actually works, why mosaic filters fail, and the one method that cannot be undone. Read the guide
- Privacy · 5 min read On-device vs cloud image tools: what happens to your photo What 'free online image tool' usually means for your file, what browser-based processing changes, and an honest account of where each approach wins and loses. Read the guide
Documents
2 guides- Documents · 7 min read Why passport photos get rejected, and how to avoid it The real reasons passport and visa photos come back — head size, shadows, glasses, expression — plus how to shoot a compliant one at home. Read the guide
- Documents · 6 min read How OCR really works, and what wrecks its accuracy What optical character recognition does to your image, why screenshots read almost perfectly and photos do not, and the specific things that destroy accuracy. Read the guide
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