PNG files
PNG is one of the core image formats File Juicer extracts. It supports lossless compression and transparency, making it the preferred format for interface graphics, icons and images that need a clean background.
Where File Juicer finds PNG files
macOS app bundles
macOS applications store their entire user interface as PNG files inside the app package. Drop an .app bundle onto File Juicer and it will extract all the icons, buttons, images and artwork inside. This is handy if you want to inspect an app's assets or recover graphics from an app you can no longer run.
Icon files (ICNS)
Modern macOS ICNS icon files are containers holding PNG images at multiple resolutions — 16×16 up to 1024×1024. File Juicer can extract the individual PNG images from an ICNS file.
Office and productivity documents
Word, PowerPoint, Excel, Pages, Keynote and Numbers all embed PNG images alongside JPEGs. File Juicer extracts them without re-compression, preserving transparency where it exists.
PDF files
PDF files store losslessly compressed images as PNG bitmaps internally. File Juicer extracts them as PDF fragments to preserve ICC colour profiles, but you can convert those to PNG with Preview.
Browser caches
Safari and Chrome cache PNG files as part of normal browsing. File Juicer can extract them from the Safari cache or Chrome cache folders.
ZIP archives and Windows EXE installers
Windows applications and installers frequently bundle PNG files as resources. File Juicer can find them inside EXE files and ZIP archives.
EPUB ebooks
EPUB files are ZIP archives containing HTML, CSS and images. File Juicer can extract the PNG and JPEG images embedded in an ebook.
iPhone apps (CgBI)
PNG files inside iPhone application (.ipa) files use Apple's proprietary CgBI compression, which is not standard PNG. Modern macOS and Preview handle these correctly, but older systems needed a special tool to decode them. File Juicer extracts them as found.
Text inside PNG
The PNG format supports embedded text chunks (tEXt, iTXt) for storing metadata such as author, description and copyright. File Juicer can extract this text alongside the image.