A Technical Guide to File Compression: PDF, Image, Video and Documents Explained

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File compression is a common need in everyday digital work, addressing problems like oversized email attachments, large PDFs, and storage-hungry media files. Compression broadly falls into two categories: lossless, which preserves every bit of original data using algorithms like DEFLATE and LZMA, and lossy, which discards information less perceptible to human senses to achieve smaller sizes. Lossless compression suits text, code, and spreadsheets where data integrity is critical, while lossy compression is better suited for images, audio, and video where minor quality loss is acceptable. Techniques such as DCT and inter-frame prediction power lossy formats like JPEG and H.264, whereas ZIP, PNG, and FLAC rely on lossless methods. Most document formats like PDF and Word use both approaches simultaneously, applying lossless compression to text and lossy compression to embedded media.

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