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Everything PDF and document: converting to and from Word, merging scans, splitting chapters, compressing for email, and understanding why PDFs behave the way they do.

The practical craft of shrinking files: lossless vs lossy compression, beating email attachment limits, and choosing the setting that saves space without visible damage.

Handling files safely online: what metadata your documents and photos leak, what to check before using an online converter, and why auto-deleting uploads matters.

PNG, JPG, WebP, AVIF, HEIC, GIF — what each image format is for, how to convert between them, and how to resize and shrink pictures without wrecking them.

CSV, JSON, spreadsheets, and the small data conversions office life runs on — turning one into the other, fixing broken imports, and knowing which format a tool actually wants.