Publish 2 shards CC-MAIN-2026-12/61410–61411
Browse files- README.md +12 -12
- charts/timing_chart.png +2 -2
- charts/totals_chart.png +2 -2
- data/CC-MAIN-2026-12/06/14/061410.parquet +3 -0
- data/CC-MAIN-2026-12/06/14/061411.parquet +3 -0
- stats.csv +5 -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 **
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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
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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
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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 **650,031,077 documents across 37607 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 **69.4 shards/hour** — 37,607 of 100,000 done (**37.61%**)
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Estimated completion: **May 26, 2026** (37 days)
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**Current server:** 6 CPU cores, 12 GB RAM (2.8 GB available), 45 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:** 694 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 37607 files of CC-MAIN-2026-12 (650,031,077 pages total), projected to the full crawl of 100,000 WARC files.
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| Stage | 37607 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 650,031,077 clean markdown documents.
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### Processing Times
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Pipeline timings across 37607 shards of CC-MAIN-2026-12:
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```
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Download (raw WARC) ████████████░░░░░░░░░░░░ 170h 43m 26s
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Convert (HTML → Markdown → Parquet) ████████████████████████ 336h 24m 52s
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Publish (HuggingFace) ███████░░░░░░░░░░░░░░░░░ 107h 5m 12s
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```
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### Dataset Charts
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charts/timing_chart.png
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Git LFS Details
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Git LFS Details
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charts/totals_chart.png
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Git LFS Details
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Git LFS Details
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data/CC-MAIN-2026-12/06/14/061410.parquet
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version https://git-lfs.github.com/spec/v1
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oid sha256:0a2adb78c8d3bbb5294744c58f8d9c2aab87ddc22416e21b8c6aca4d41a37bdf
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size 50179358
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data/CC-MAIN-2026-12/06/14/061411.parquet
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version https://git-lfs.github.com/spec/v1
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oid sha256:ee589c5dafd9dd6a8264394e4f6485b4844c73c4dc3773659ec95333ce344a6e
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size 46503809
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stats.csv
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@@ -25636,6 +25636,8 @@ CC-MAIN-2026-12,61403,17031,2416905731,153556391,46642961,2026-04-18T14:41:41Z,2
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CC-MAIN-2026-12,61404,17343,2464318370,159219072,50304763,2026-04-18T14:43:51Z,23,36,0,14,535
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CC-MAIN-2026-12,61405,17191,2443906488,152915535,48890997,2026-04-18T14:43:51Z,23,40,0,14,587
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CC-MAIN-2026-12,61406,17225,2402785025,156273576,48050290,2026-04-18T14:43:51Z,25,43,0,14,592
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CC-MAIN-2026-12,61407,17277,2492981150,163749026,50459699,2026-04-18T14:46:11Z,33,46,0,
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CC-MAIN-2026-12,61408,17335,2436895586,151875133,48233818,2026-04-18T14:46:11Z,27,49,0,
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CC-MAIN-2026-12,61409,17391,2448566554,151440978,47280560,2026-04-18T14:46:11Z,29,48,0,
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CC-MAIN-2026-12,61404,17343,2464318370,159219072,50304763,2026-04-18T14:43:51Z,23,36,0,14,535
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CC-MAIN-2026-12,61405,17191,2443906488,152915535,48890997,2026-04-18T14:43:51Z,23,40,0,14,587
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CC-MAIN-2026-12,61406,17225,2402785025,156273576,48050290,2026-04-18T14:43:51Z,25,43,0,14,592
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CC-MAIN-2026-12,61407,17277,2492981150,163749026,50459699,2026-04-18T14:46:11Z,33,46,0,12,601
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CC-MAIN-2026-12,61408,17335,2436895586,151875133,48233818,2026-04-18T14:46:11Z,27,49,0,12,600
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CC-MAIN-2026-12,61409,17391,2448566554,151440978,47280560,2026-04-18T14:46:11Z,29,48,0,12,606
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CC-MAIN-2026-12,61410,17267,2459171399,159485565,50179358,2026-04-18T14:47:31Z,23,44,0,0,598
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CC-MAIN-2026-12,61411,17136,2428259213,152744584,46503809,2026-04-18T14:47:31Z,22,32,0,0,616
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