Guides
Image formats involve real trade-offs, and most of them are decided by facts rather than preferences. These articles explain the facts: what each format stores, what is lost when you convert, and how to pick a format that will still open in a few years.
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Does my image stay on my device?
A direct answer, because the honest one depends on the conversion. This explains which operations are local, which need the server, and how the tool tells you which was which.
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GIF and animation: what a still converter cannot do
Animated GIFs need a format that stores a sequence of frames. Converting one to PNG, JPG or WebP means keeping a single frame, and this tool says so instead of quietly dropping the rest.
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Resizing images without wrecking them
Resizing changes an image more than most people expect. Here is what the three fit modes do, why enlarging is a losing game, and how to choose target dimensions.
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What is a HEIC file, and why is it awkward?
iPhones save photos as HEIC by default. The format is better than JPG on almost every axis, and that is exactly why it causes trouble: support outside Apple devices is uneven.
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How image compression actually works
A short explanation of the two families of image compression, why lossless and lossy behave so differently, and what that means for repeated conversions.
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PNG or JPG: choosing the right format
The choice comes down to two questions: does the image need transparency, and does it contain text, lines or flat colour? Everything else follows from those.
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How to convert WebP to JPG
WebP is the default image format on many sites, which is awkward when an older program refuses to open it. Here is what actually happens when you convert one, and why the result can never be better than the WebP you started with.