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In addition to viewing and printing digital images and Portable Document Format (PDF) files, it can also edit these media types.

It employs the Aqua graphical user interface, the Quartz graphics layer, and the ImageIO and Core Image frameworks.

However, encrypted PDFs cannot be edited further, so the original author should always keep an unencrypted version.

When annotating images, Preview uses vector shapes and text until the image is rasterized to JPEG, PNG or another bitmap format.

PDF and image documents can also be supplied with keywords, and are then automatically indexed using macOSs system-wide Spotlight search engine.

Preview can convert between image formats; it can export to BMP, JP2, JPEG, PDF, PICT, PNG, SGI, TGA, and TIFF.

Preview App Full Format List

It is possible to access the full format list by holding down the Option key when clicking the Format popup menu.

GIF, ICNS, JPEG, JPEG-2000, Microsoft BMP, Microsoft Icon, OpenEXR, PDF, Photoshop, PNG, SGI, TGA, TIFF).

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Preview App For Mac