Lossless coding removes repetition; lossy coding also removes information judged less important to perception. There is no one-line answer here: it depends on evidence from the source, the specific properties named below, and the destination's real requirements.
Compression decisions should compare perceptual quality, structural fidelity, decode support, and transfer cost - Not size alone. Before anything else in “Lossy vs. lossless compression in plain English,” weigh this observation: ZIP and FLAC can reconstruct the original bytes or samples.
Three findings that guide this choice
The core distinction
ZIP and FLAC can reconstruct the original bytes or samples.
The practical trade-off
JPEG and AAC aim for perceptual similarity, not byte identity.
The verification test
Repeated lossy saves compound damage even when settings look high.
A practical decision for this workflow
Preserve a lossless master whenever future editing or re-encoding is likely.
Use repeated lossy saves compound damage even when settings look high. as the acceptance test on a representative source before committing an entire archive, publication, or delivery batch.
The compression & quality mistake to avoid here
Using a delivery format as the only source for every future export.
That failure conflicts directly with the recommendation for “Lossy vs. lossless compression in plain English”: Preserve a lossless master whenever future editing or re-encoding is likely.
Review checklist before delivery
- ✓The result meets the actual transfer or storage budget.
- ✓Artifacts are checked in the hardest visual or audible passage.
- ✓Dimensions, duration, and structure were not reduced accidentally.
- ✓The uncompressed or highest-quality master remains available.
Judge “Lossy vs. lossless compression in plain English” by whether the result passes these specific checks, not by whether a new file merely opens.