Lossless Compression
Lossless compression shrinks files by encoding redundancy more efficiently without throwing away pixel values. PNG and lossless WEBP use lossless methods. When you decompress, every pixel matches the pre-compression source. File sizes are larger than lossy equivalents for photographs, but lossless is essential for graphics with sharp edges, text, and transparency where artifacts would be obvious.
Lossless does not mean the file is small—only that no detail was sacrificed. A noisy photograph saved as PNG may still be megabytes because random noise lacks patterns the encoder can compress. Lossless shines on screenshots, logos, and diagrams where repeated flat colors and straight lines compress well.
FileShrinkr's lossless PDF export embeds original image bytes via img2pdf without re-encoding to JPEG. Use that path for scans, signed documents, and assets headed to print workflows. For everyday web photos, lossy JPG or WEBP at tuned quality delivers better size-to-quality balance than lossless PNG.