The same source saved at quality 10/50/90 for comparing compression artefacts and quality settings.
Each card starts with one representative test file. Choose a use case, search, or filter to find a specific profile; a card’s variant menu contains its related samples.
13 test families · 36 available files · Page 1 of 1
Color And Metadata
The fruit still life as a baseline (sequential) JPEG, paired with a progressive JPEG of identical content for testing decode order and progressive-rendering support.
P8 Convert
Existing-format ZIP/TXT media control combining a plain README and a WebVTT sidecar for nested media extraction checks Stable P8 artifact p8-convert-legacy-archive-media-control.
Crawlers
A 500-URL sitemap served the way large sites serve them - gzip-compressed as sitemap-large.xml.gz. The gzip header carries mtime 0 and no embedded filename, so the bytes are stable across regenerations. For testing that
JPEG Artefacts
Lossless PNG ground truth for JPEG blocking / ringing artefact repair tests.
Edge Cases
The same 512px source saved at JPEG quality 10: part of a q10/50/90 ladder for comparing compression artefacts at a glance.
Compression
A text file compressed with the LZ4 frame format (.lz4), the container-free codec on its own, for testing LZ4 decompression and codec detection.
Nested Mixed
A tar carrying three ZIPs: two byte-identical and a third holding the same content stored rather than deflated. A deduplicating packer should notice the first two are the same object; a content-addressed one should notic
Empty
The empty tar under bzip2. Its payload is 1024 identical bytes, which is the run-length case bzip2's block sorter treats specially, so this doubles as the smallest sane bzip2 stream to test a decoder against.
Upscale Set
256×256 bicubic downscale further JPEG-compressed at quality 35: a harder super-resolution input with artefacts.
Upscale Set
256×256 bicubic downscale further JPEG-compressed at quality 35: a harder super-resolution input with artefacts.
Zip Structure
A ZIP whose every member uses compression method 8 (deflate). Its twin holds byte-identical content under the other method, so an extractor, a size estimator, or a repacking pipeline can be compared on the same payload w
Zip Payload
A deliberately bounded compression-ratio fixture: 4474 bytes on disk expanding to exactly 4 MiB of zeros, roughly 937:1. It is not a decompression bomb - there is no nesting and no recursion, and the expanded size is a f
Compression
A text file compressed with Zstandard (.zst), the container-free codec on its own, for testing zstd decompression and codec detection.
