In this guide
You have downloaded a sketch, and an editor offers several file formats. The right choice depends on what happens next: another edit, a message to a friend, a web upload or a print order. A large file is not automatically a detailed image, and changing its extension cannot restore detail that was already lost.
Separate three decisions
Check pixel dimensions, compression and compatibility separately. Pixel dimensions describe the image grid, such as 2400 × 3000 pixels. Compression affects how that grid is stored. Compatibility determines whether your editor, recipient or print service accepts the file. Choose all three for the intended use.
MDN's image format reference describes JPEG as lossy, PNG as lossless and WebP as supporting both lossy and lossless compression. PNG and WebP can also store transparency. Those are format capabilities, not a promise that every export uses the same settings.
Keep the downloaded original as your master
Save the original download before changing its crop or size. Treat it as a master that you can return to. If it is a JPEG, converting a working copy to PNG prevents further JPEG loss during subsequent lossless saves, but does not undo the original compression. If it is already a PNG, keep that file rather than making an unnecessary conversion.
When editing, use an editor's project format if you need layers, masks or reversible adjustments. A flattened PNG can preserve the visible result, but it will not preserve every editable layer. Keep the project and an exported image when both serve a purpose.
Use JPEG for a compatible sharing copy
JPEG is a reasonable option for a complete drawing on an opaque paper background when the receiving app accepts it. Export once at a high quality setting, then inspect the result. Labels such as 90 or High differ between editors, so judge the saved file rather than the number alone.
Look closely around eyelashes, fine hatching and the boundary between a white margin and a dark stroke. If you see halos or small block-like patches that were absent from the master, increase export quality or use a lossless format accepted by the destination. Repeatedly opening, editing and re-saving a JPEG can introduce further loss; return to the master for a new version.
Use PNG when lossless storage or transparency matters
PNG is useful for a working export, line drawing or design that needs a transparent background. It may be much larger than a JPEG for a textured sketch. Check transparency against a dark background: a white page in your original does not automatically become transparent just because you export a PNG.
For print, a white paper background may be intentional. Ask the printer which format it accepts before removing that background or converting the file. A supported high-quality JPEG can be preferable to an unsupported format that forces a last-minute conversion.
Use WebP when the destination supports it
WebP can be convenient for publishing a sketch online. Choose the export mode deliberately and compare its saved output with the master. If a print shop or messaging service will not accept it, export a supported copy from the original rather than taking a screenshot of a browser preview.
A worked delivery example
Suppose your master is 2400 × 3000 pixels and you want an 8 × 10 inch print. That gives 300 pixels per inch before cropping. Converting the same pixels to PNG does not increase that density. Cropping to 1800 × 2250 pixels gives 225 pixels per inch at the same print size, even if the resulting PNG occupies more storage.
Keep portrait-master.png, export portrait-web.jpg for sharing and save portrait-print-8x10.jpg at the dimensions the printer requests. Open each saved copy to check its actual dimensions, crop and appearance. Use the print planner for the size calculation and the printing guide for a small paper proof.
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