Start with the receiving application
The most useful format is one the receiving application accepts and displays correctly. A website may accept WebP while a form accepts only JPG. A slide deck may render PNG more reliably than a linked SVG. Read the destination requirements before converting; a smaller file is not helpful if it cannot be opened.
Keep an original file with its useful transparency and resolution. Conversion creates a new representation of the image. It is not a reason to delete the source, particularly when you may later need another size or format.
Use JPG for compatible photo delivery
JPG is often a practical choice for opaque photographs. Its quality setting changes the trade-off between encoded size and visible artifacts. The right setting depends on content and use: a small email preview and a photograph with tiny lettering do not deserve the same automatic choice.
JPG has no transparent pixels. When converting a transparent PNG to JPG in ImgProcess, choose a background colour and inspect the boundary of the logo or cutout. White may fit a document, but a dark design may need a different fill. The converter cannot preserve transparency simply because the file started as PNG.
Use PNG when transparency or exact edges matter
PNG can keep transparent areas and is often useful for logos, screenshots and rounded-corner assets. The output may be much larger than a lossy photo format. If transparency is required, accept that the file-size decision has a different constraint than it does for an ordinary opaque photograph.
A very detailed photograph saved as PNG is not automatically better for a website. Compare how it will be displayed and whether a smaller compatible format is sufficient. Avoid describing every PNG as the best choice without considering its purpose.
Consider WebP within a compatible workflow
WebP can be useful for modern web delivery and can preserve transparency. Select it when the publishing and download workflow accepts it, then test the exported copy in that actual workflow. Do not rely solely on the browser preview if the image will be used in another application.
ImgProcess exposes JPG, PNG and WebP for its general converter. That does not mean every specialist source format can be decoded. HEIC, camera RAW and unusual BMP variants can require another decoding step before a browser tool can open them.
Handle vector and animated sources deliberately
SVG to PNG rasterizes a vector into pixels. A self-contained SVG is easier to render consistently than one depending on external fonts or linked pictures. After rasterizing, check the required display size; enlarging the PNG later does not recover the vector’s scalability.
GIF to JPG produces a still image from the decoded frame. It does not preserve animation or offer a complete frame-selection editor. If the requirement is an animation, converting to JPG answers a different task. Choose the output around the content you need to preserve.
A conversion is not a recovery operation
Changing JPG to PNG avoids another JPG encoding step for that export, but cannot recover detail already discarded in the original JPG. Changing PNG to JPG can be useful for an opaque photograph, but flattens transparent space into a background.
Check the saved extension and appearance in the receiving application. Renaming an extension does not change the encoded file format. ImgProcess exports the available JPG, PNG and WebP choices; it does not promise arbitrary PDF, PSD or camera-RAW conversion.
