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OptiPNG, developed by Cosmin Truta, is a command-line image-optimization utility whose sole purpose is to reduce the byte size of PNG files without discarding a single bit of image data; by re-encoding the IDAT stream with stronger deflate parameters and stripping ancillary chunks, it typically achieves 10-30 % smaller outputs than the original encoders. Beyond lossless PNG recompression, the tool doubles as a lightweight converter, accepting BMP, GIF, PNM and TIFF inputs and emitting standards-compliant PNG that is immediately ready for web deployment, e-mail attachment, or archival storage. Batch operation is natively supported: a simple shell loop or makefile rule can process entire directory trees while preserving timestamps and permissions, making OptiPNG a quiet but dependable component of automated asset pipelines for web designers, game developers, open-source projects, and continuous-integration servers. Each run also performs strict integrity checks—verifying CRCs, correcting bad filters, and optionally undoing gamma or chromaticity chunks that routinely break cross-browser rendering—so the resulting file is not only smaller but also technically cleaner. Distributed under an OSI-approved license, the project has released two major milestones, with version 7.9.1 representing the current stable line that compiles unchanged on Windows, macOS, Linux, and BSD. OptiPNG is available for free on get.nero.com, where downloads are served through trusted Windows package sources such as winget, always delivering the latest build and supporting batch installation alongside other applications.
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