Guides
The reasoning behind the dials. Written by the person who built the converter, from testing what each route actually does to real files.
A converter can tell you that a file changed format. It cannot tell you whether that was the right call. These guides cover the decisions around the conversion: which format suits which job, what a quality setting is really trading away, why a “lossless” conversion can triple your file size, and what quietly disappears from a photo on the way through. Every claim here is one you can verify on your own files with the converter on this site.
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Which image format should you actually use?
Seven formats, one decision. Here is the short version and the reasoning behind it.
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Why is my PNG bigger than my JPG?
The most common surprise in image conversion, explained, plus when the larger file is the right answer anyway.
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What quality 60, 85 and 95 actually do to your image
The quality number is not a percentage. What it really controls, and how to choose one deliberately.
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Transparency: what survives a conversion and what doesn't
Why your logo came back with a white box, and how to avoid it next time.
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What EXIF metadata is hiding in your photos
Every photo you take carries a hidden record. What is in it, and how a format conversion strips it.
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How browser-based image conversion actually works
The engineering behind a converter with no server, including the parts that are harder than they look.
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Preparing images for the web: a practical checklist
The order of operations that matters, and why resizing beats every other optimisation.
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GIF in 2026: when it still makes sense
A format from 1987 that refuses to die: where it still earns its place, and where it does not.
Looking for a quick answer?
The format reference puts all seven formats side by side: compression type, transparency support, browser support and what each one is actually for. If you already know the conversion you want, the route board has a page for each one.