Publish 3 shards CC-MAIN-2026-12/61404–61406
Browse files- README.md +12 -12
- data/CC-MAIN-2026-12/06/14/061404.parquet +3 -0
- data/CC-MAIN-2026-12/06/14/061405.parquet +3 -0
- data/CC-MAIN-2026-12/06/14/061406.parquet +3 -0
- stats.csv +6 -3
README.md
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**Open Markdown** is a large-scale web text dataset built from [Common Crawl](https://commoncrawl.org). Common Crawl is a non-profit that crawls the web and freely provides its archives and datasets to the public — see [their latest crawl announcement](https://commoncrawl.org/blog/march-2026-crawl-archive-now-available) for details on the source data. Every page goes through a pipeline that extracts the main content from raw HTML, converts it to clean Markdown, and packages the result into Parquet files with useful WARC metadata for traceability.
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The dataset currently includes crawl **CC-MAIN-2026-12** with **649,
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### Live Progress
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Processing at **69.
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Estimated completion: **May 26, 2026** (
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**Current server:** 6 CPU cores, 12 GB RAM (
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**Memory per session:** avg 575 MB, peak 799 MB (measured via VmRSS)
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**With 10 identical servers:**
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**Open Markdown** is released under the **Open Data Commons Attribution License (ODC-By) v1.0**, the same license used by Common Crawl.
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### Compression Ratios
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Numbers below are actual measurements summed across all
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| Raw WARC (.warc.gz, downloaded) | ~29.8 TB | ~79.2 TB | — |
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| HTML extracted (uncompressed) | 84.2 TB | ~224.0 TB | — |
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The big win is HTML → Markdown conversion: the tokenizer strips all tags, scripts, styles, navigation, and ads, keeping only the main content. This cuts 84.2 TB of uncompressed HTML down to 5.4 TB of markdown — a **93.6% reduction**. Parquet with Zstd then compresses the markdown a further 68.9%.
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End to end: ~29.8 TB of raw gzipped WARCs becomes **1.7 TB of Parquet** — a **94.3% total reduction** — containing 649,
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### Processing Times
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Pipeline timings across
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```
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Download (raw WARC) ████████████░░░░░░░░░░░░ 170h
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Convert (HTML → Markdown → Parquet) ████████████████████████ 336h
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Publish (HuggingFace) ███████░░░░░░░░░░░░░░░░░ 107h 3m
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```
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### Dataset Charts
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**Open Markdown** is a large-scale web text dataset built from [Common Crawl](https://commoncrawl.org). Common Crawl is a non-profit that crawls the web and freely provides its archives and datasets to the public — see [their latest crawl announcement](https://commoncrawl.org/blog/march-2026-crawl-archive-now-available) for details on the source data. Every page goes through a pipeline that extracts the main content from raw HTML, converts it to clean Markdown, and packages the result into Parquet files with useful WARC metadata for traceability.
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The dataset currently includes crawl **CC-MAIN-2026-12** with **649,927,394 documents across 37601 shards**. Processed 84.2 TB of raw HTML into 5.4 TB of clean Markdown — a **93.6% reduction**. We plan to add more snapshots over time.
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### Live Progress
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Processing at **69.3 shards/hour** — 37,601 of 100,000 done (**37.60%**)
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Estimated completion: **May 26, 2026** (38 days)
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**Current server:** 6 CPU cores, 12 GB RAM (3.4 GB available), 48 GB disk free
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**Memory per session:** avg 575 MB, peak 799 MB (measured via VmRSS)
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**With 10 identical servers:** 693 shards/hour → April 22, 2026 (4 days)
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**Open Markdown** is released under the **Open Data Commons Attribution License (ODC-By) v1.0**, the same license used by Common Crawl.
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### Compression Ratios
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Numbers below are actual measurements summed across all 37601 files of CC-MAIN-2026-12 (649,927,394 pages total), projected to the full crawl of 100,000 WARC files.
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| Stage | 37601 files (measured) | 100,000 files (projected) | Reduction |
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|---|---|---|---|
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| Raw WARC (.warc.gz, downloaded) | ~29.8 TB | ~79.2 TB | — |
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| HTML extracted (uncompressed) | 84.2 TB | ~224.0 TB | — |
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The big win is HTML → Markdown conversion: the tokenizer strips all tags, scripts, styles, navigation, and ads, keeping only the main content. This cuts 84.2 TB of uncompressed HTML down to 5.4 TB of markdown — a **93.6% reduction**. Parquet with Zstd then compresses the markdown a further 68.9%.
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End to end: ~29.8 TB of raw gzipped WARCs becomes **1.7 TB of Parquet** — a **94.3% total reduction** — containing 649,927,394 clean markdown documents.
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### Processing Times
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Pipeline timings across 37601 shards of CC-MAIN-2026-12:
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```
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Download (raw WARC) ████████████░░░░░░░░░░░░ 170h 41m 12s
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Convert (HTML → Markdown → Parquet) ████████████████████████ 336h 21m 13s
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Publish (HuggingFace) ███████░░░░░░░░░░░░░░░░░ 107h 3m 54s
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```
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### Dataset Charts
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data/CC-MAIN-2026-12/06/14/061404.parquet
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version https://git-lfs.github.com/spec/v1
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oid sha256:8f7f9edb4d9e57de8578f0c7f969770731ebafdd70907214e567e98df54d8b9d
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size 50304763
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data/CC-MAIN-2026-12/06/14/061405.parquet
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version https://git-lfs.github.com/spec/v1
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size 48890997
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data/CC-MAIN-2026-12/06/14/061406.parquet
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version https://git-lfs.github.com/spec/v1
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size 48050290
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stats.csv
CHANGED
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@@ -25630,6 +25630,9 @@ CC-MAIN-2026-12,61397,17182,2441814604,156465822,48291482,2026-04-18T14:34:41Z,2
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CC-MAIN-2026-12,61398,17176,2437499091,152124339,48031834,2026-04-18T14:34:41Z,25,34,0,9,546
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CC-MAIN-2026-12,61399,17191,2445505340,152984575,47561536,2026-04-18T14:34:41Z,0,37,0,9,528
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CC-MAIN-2026-12,61400,17004,2409195306,148845877,45828048,2026-04-18T14:39:32Z,28,34,0,31,516
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CC-MAIN-2026-12,61401,17200,2445003244,157808446,48558380,2026-04-18T14:41:41Z,25,40,0,
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CC-MAIN-2026-12,61402,17015,2415049544,148191835,46567742,2026-04-18T14:41:41Z,23,41,0,
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CC-MAIN-2026-12,61403,17031,2416905731,153556391,46642961,2026-04-18T14:41:41Z,23,38,0,
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CC-MAIN-2026-12,61398,17176,2437499091,152124339,48031834,2026-04-18T14:34:41Z,25,34,0,9,546
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CC-MAIN-2026-12,61399,17191,2445505340,152984575,47561536,2026-04-18T14:34:41Z,0,37,0,9,528
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| 25632 |
CC-MAIN-2026-12,61400,17004,2409195306,148845877,45828048,2026-04-18T14:39:32Z,28,34,0,31,516
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CC-MAIN-2026-12,61401,17200,2445003244,157808446,48558380,2026-04-18T14:41:41Z,25,40,0,12,577
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CC-MAIN-2026-12,61402,17015,2415049544,148191835,46567742,2026-04-18T14:41:41Z,23,41,0,12,599
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CC-MAIN-2026-12,61403,17031,2416905731,153556391,46642961,2026-04-18T14:41:41Z,23,38,0,12,591
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CC-MAIN-2026-12,61404,17343,2464318370,159219072,50304763,2026-04-18T14:43:51Z,23,36,0,0,535
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CC-MAIN-2026-12,61405,17191,2443906488,152915535,48890997,2026-04-18T14:43:51Z,23,40,0,0,587
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CC-MAIN-2026-12,61406,17225,2402785025,156273576,48050290,2026-04-18T14:43:51Z,25,43,0,0,592
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