Image guides
Answers to the places people most often get stuck with image formats, conversion and file size.
How to Convert Many Images at Once
Drop dozens of images in mixed formats, convert them all to the same format and size in one go, and download a ZIP. Plus what to know about batch conversion.
2 min readbatch conversionZIPworkflow
How to Choose an Image Format at a Glance
Which of JPG, PNG, WebP, AVIF, GIF, SVG and ICO should you use? Selection rules by purpose, backed by measured file-size comparisons.
3 min readimage formatscomparisonguide
How to Make a Favicon: ICO, PNG or SVG?
How to make a website favicon from one image, how to choose between ICO, PNG and SVG, which sizes to use, and how to link it in your HTML.
2 min readfaviconICOwebsite
How to Open iPhone Photos on Windows (No Install)
When iPhone HEIC photos won't open on a Windows PC, here are ways that need no extension, plus settings changes, explained by situation.
2 min readiPhoneHEICWindows
Converting PNG to SVG: What Works and What Doesn't
How PNG-to-SVG tracing works and where it fails, with measured numbers: why logos and icons work, photos don't, and how to check the result.
5 min readSVGPNGvectortracing
PNG vs JPG: Which Should You Save As?
We saved a photo and a screenshot-like image as both PNG and JPG and compared file sizes. PNG isn't always bigger, and here is how to choose by use.
2 min readPNGJPGcomparison
Shrink Images for the Web: Size, Format, Quality
The order that shrinks images the most (size, format, quality), with measured numbers, and why lowering quality alone isn't the answer.
3 min readweb optimizationfile size
How to Remove Location Data (EXIF) from Photos
Photo files can hide where, with what and when they were taken. What EXIF is, how to remove it before you share, and how to check that it's gone.
2 min readEXIFprivacyphotos
Choosing the Resolution for SVG to PNG
SVG has no resolution, so you must choose a size when converting to PNG. How to keep it sharp, what happens with SVGs that have no size, and font problems.
3 min readSVGPNGresolution
Unify Image Sizes for Games: Mixed Sizes in One Pass
How to bring images from different sources, with mismatched sizes, ratios and formats, to one spec (for example transparent 256×256 PNGs) in a single batch.
4 min readgame developmentresizespecs
How to Check That Your Photos Aren't Uploaded
Don't just trust 'converted only in the browser'. Verify it yourself with the developer tools' Network tab and an offline test.
3 min readprivacysecurityverification
WebP vs JPG: Differences and Which to Use
How WebP and JPG differ in compression, transparency and compatibility, with measured file-size comparisons and advice on which to choose for each situation.
2 min readWebPJPGcomparison
What Is HEIC and Why Won't It Open?
Why iPhones save photos as HEIC, why they won't open on Windows or the web, and how to convert them to JPG or shoot JPG from the start.
3 min readHEICiPhone