Publish 5 shards CC-MAIN-2026-12/16593–16804
Browse files
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 **286,
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### Live Progress
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Processing at **
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Estimated completion: **April
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**Current server:** 6 CPU cores, 12 GB RAM (3.
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**Memory per session:** avg 578 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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| Stage |
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|---|---|---|---|
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| Raw WARC (.warc.gz, downloaded) | ~13.2 TB | ~79.2 TB | — |
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| HTML extracted (uncompressed) | 37.1 TB | ~222.6 TB | — |
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| Markdown (clean text) | 2.4 TB | ~6.8 TB | **-96.9%** vs HTML |
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| Final Parquet (Zstd) |
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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 37.1 TB of uncompressed HTML down to 2.4 TB of markdown — a **96.9% reduction**. Parquet with Zstd then compresses the markdown a further 68.9%.
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End to end: ~13.2 TB of raw gzipped WARCs becomes **
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### Processing Times
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Pipeline timings across
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```
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Download (raw WARC) ██████████░░░░░░░░░░░░░░ 164h
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Convert (HTML → Markdown → Parquet) ████████████████████████ 394h
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Publish (HuggingFace) ███░░░░░░░░░░░░░░░░░░░░░ 61h 58m
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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 **286,334,688 documents across 16675 shards**. Processed 37.1 TB of raw HTML into 2.4 TB of clean Markdown — a **96.9% reduction**. We plan to add more snapshots over time.
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### Live Progress
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Processing at **140.0 shards/hour** — 16,675 of 100,000 done (**16.68%**)
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Estimated completion: **April 20, 2026** (25 days)
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**Current server:** 6 CPU cores, 12 GB RAM (3.6 GB available), 99 GB disk free
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**Memory per session:** avg 578 MB, peak 799 MB (measured via VmRSS)
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**With 10 identical servers:** 1400 shards/hour → March 29, 2026 (2 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 16675 files of CC-MAIN-2026-12 (286,334,688 pages total), projected to the full crawl of 100,000 WARC files.
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| Stage | 16675 files (measured) | 100,000 files (projected) | Reduction |
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|---|---|---|---|
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| Raw WARC (.warc.gz, downloaded) | ~13.2 TB | ~79.2 TB | — |
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| HTML extracted (uncompressed) | 37.1 TB | ~222.6 TB | — |
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| Markdown (clean text) | 2.4 TB | ~6.8 TB | **-96.9%** vs HTML |
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| Final Parquet (Zstd) | 768.0 GB | ~4.5 TB | **-68.9%** vs markdown |
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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 37.1 TB of uncompressed HTML down to 2.4 TB of markdown — a **96.9% reduction**. Parquet with Zstd then compresses the markdown a further 68.9%.
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End to end: ~13.2 TB of raw gzipped WARCs becomes **768.0 GB of Parquet** — a **94.3% total reduction** — containing 286,334,688 clean markdown documents.
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### Processing Times
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Pipeline timings across 16675 shards of CC-MAIN-2026-12:
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```
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Download (raw WARC) ██████████░░░░░░░░░░░░░░ 164h 15m 27s
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Convert (HTML → Markdown → Parquet) ████████████████████████ 394h 12m 11s
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Publish (HuggingFace) ███░░░░░░░░░░░░░░░░░░░░░ 61h 58m 52s
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```
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### Dataset Charts
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data/CC-MAIN-2026-12/01/65/016593.parquet
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stats.csv
CHANGED
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@@ -16501,7 +16501,8 @@ CC-MAIN-2026-12,16588,17435,2491476711,162571744,49507369,2026-03-27T02:01:40Z,9
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CC-MAIN-2026-12,16589,17419,2470410275,164613675,50880695,2026-03-27T02:04:20Z,75,124,2,9,601
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CC-MAIN-2026-12,16591,17598,2519775510,162322038,50514763,2026-03-27T02:09:10Z,70,150,1,7,577
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CC-MAIN-2026-12,16592,17447,2479336958,158405636,48411246,2026-03-27T02:11:50Z,97,112,0,
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CC-MAIN-2026-12,16600,17336,2427103310,161430010,51839865,2026-03-27T00:34:30Z,61,83,0,19,588
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CC-MAIN-2026-12,16601,17403,2441951008,156508492,48667595,2026-03-27T00:36:40Z,73,92,0,9,594
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| 16543 |
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CC-MAIN-2026-12,16641,17673,2505674795,162866054,50381731,2026-03-27T02:09:10Z,67,138,1,7,563
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CC-MAIN-2026-12,16642,17425,2499583012,158438309,49610979,2026-03-27T02:11:50Z,68,93,0,
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| 16547 |
CC-MAIN-2026-12,16650,17665,2513001801,155471048,48227474,2026-03-27T00:47:20Z,194,162,3,19,563
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CC-MAIN-2026-12,16652,17313,2453847599,160740840,50904316,2026-03-27T00:55:10Z,125,176,2,10,606
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|
@@ -16578,6 +16580,7 @@ CC-MAIN-2026-12,16681,17333,2463140223,164087214,50319179,2026-03-27T02:01:40Z,6
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CC-MAIN-2026-12,16682,17673,2546814000,162727810,50922915,2026-03-27T02:06:40Z,0,149,2,8,593
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CC-MAIN-2026-12,16734,17433,2482054356,162021590,50894391,2026-03-27T02:06:40Z,99,140,1,8,587
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CC-MAIN-2026-12,16735,17484,2490771536,161357749,49240265,2026-03-27T02:09:10Z,83,139,2,7,549
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CC-MAIN-2026-12,16736,17769,2552942608,163789032,51298654,2026-03-27T02:09:10Z,70,115,0,7,573
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@@ -16650,8 +16654,9 @@ CC-MAIN-2026-12,16782,17498,2524839294,163899719,49658900,2026-03-27T02:01:40Z,7
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|
| 16650 |
CC-MAIN-2026-12,16783,17381,2465420963,159377999,49331811,2026-03-27T02:04:20Z,84,144,1,9,598
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CC-MAIN-2026-12,16785,17639,2476894188,163905555,50405679,2026-03-27T02:09:10Z,64,136,1,7,555
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CC-MAIN-2026-12,16786,17685,2531741720,155071366,49170235,2026-03-27T02:11:50Z,71,91,0,
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CC-MAIN-2026-12,16800,17647,2508925923,164950819,50682518,2026-03-27T02:04:20Z,143,150,1,9,592
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CC-MAIN-2026-12,16801,17566,2478259428,162118722,50673423,2026-03-27T02:06:40Z,150,142,2,8,586
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CC-MAIN-2026-12,16802,17507,2525695824,158872992,48167412,2026-03-27T02:09:10Z,120,134,1,7,589
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CC-MAIN-2026-12,16803,17470,2493030494,161154116,50516050,2026-03-27T02:11:50Z,0,106,3,
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|
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CC-MAIN-2026-12,16592,17447,2479336958,158405636,48411246,2026-03-27T02:11:50Z,97,112,0,13,559
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CC-MAIN-2026-12,16593,17536,2490262348,161580546,49945964,2026-03-27T02:14:20Z,0,122,1,0,562
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| 16506 |
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|
|
|
| 16544 |
CC-MAIN-2026-12,16639,17737,2546052879,160160015,50801701,2026-03-27T02:04:20Z,102,143,1,9,564
|
| 16545 |
CC-MAIN-2026-12,16640,17275,2454150247,154969765,49101362,2026-03-27T02:06:40Z,66,134,1,8,537
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CC-MAIN-2026-12,16641,17673,2505674795,162866054,50381731,2026-03-27T02:09:10Z,67,138,1,7,563
|
| 16547 |
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CC-MAIN-2026-12,16642,17425,2499583012,158438309,49610979,2026-03-27T02:11:50Z,68,93,0,13,537
|
| 16548 |
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CC-MAIN-2026-12,16643,17422,2483877079,162179229,50122440,2026-03-27T02:14:20Z,43,125,1,0,562
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| 16549 |
CC-MAIN-2026-12,16650,17665,2513001801,155471048,48227474,2026-03-27T00:47:20Z,194,162,3,19,563
|
| 16550 |
CC-MAIN-2026-12,16651,17460,2481685037,157277659,49093449,2026-03-27T00:50:10Z,139,178,2,9,603
|
| 16551 |
CC-MAIN-2026-12,16652,17313,2453847599,160740840,50904316,2026-03-27T00:55:10Z,125,176,2,10,606
|
|
|
|
| 16580 |
CC-MAIN-2026-12,16682,17673,2546814000,162727810,50922915,2026-03-27T02:06:40Z,0,149,2,8,593
|
| 16581 |
CC-MAIN-2026-12,16683,17453,2459151482,154907633,47865336,2026-03-27T02:09:10Z,0,149,1,7,535
|
| 16582 |
CC-MAIN-2026-12,16684,17221,2459189987,158483267,49195802,2026-03-27T02:09:10Z,144,111,0,7,566
|
| 16583 |
+
CC-MAIN-2026-12,16685,17644,2492499792,160644950,49632993,2026-03-27T02:14:20Z,0,153,2,0,582
|
| 16584 |
CC-MAIN-2026-12,16700,17389,2510080797,155755594,47527089,2026-03-27T00:44:00Z,70,68,1,13,603
|
| 16585 |
CC-MAIN-2026-12,16701,17477,2438177469,159422328,49253592,2026-03-27T00:46:30Z,0,150,2,16,596
|
| 16586 |
CC-MAIN-2026-12,16702,17581,2498593184,163280778,49612104,2026-03-27T00:50:10Z,90,184,2,9,594
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|
|
|
| 16617 |
CC-MAIN-2026-12,16734,17433,2482054356,162021590,50894391,2026-03-27T02:06:40Z,99,140,1,8,587
|
| 16618 |
CC-MAIN-2026-12,16735,17484,2490771536,161357749,49240265,2026-03-27T02:09:10Z,83,139,2,7,549
|
| 16619 |
CC-MAIN-2026-12,16736,17769,2552942608,163789032,51298654,2026-03-27T02:09:10Z,70,115,0,7,573
|
| 16620 |
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CC-MAIN-2026-12,16737,17361,2473687378,160682812,49871821,2026-03-27T02:14:20Z,0,138,1,0,592
|
| 16621 |
CC-MAIN-2026-12,16750,17512,2501637545,163630493,51669413,2026-03-27T00:46:30Z,104,77,1,16,594
|
| 16622 |
CC-MAIN-2026-12,16751,17641,2545938612,166384473,50668037,2026-03-27T00:50:10Z,0,169,1,9,633
|
| 16623 |
CC-MAIN-2026-12,16752,17410,2486986168,164095948,49621919,2026-03-27T00:52:40Z,114,175,1,13,613
|
|
|
|
| 16654 |
CC-MAIN-2026-12,16783,17381,2465420963,159377999,49331811,2026-03-27T02:04:20Z,84,144,1,9,598
|
| 16655 |
CC-MAIN-2026-12,16784,17411,2483586464,156171221,48259036,2026-03-27T02:06:40Z,104,138,2,8,593
|
| 16656 |
CC-MAIN-2026-12,16785,17639,2476894188,163905555,50405679,2026-03-27T02:09:10Z,64,136,1,7,555
|
| 16657 |
+
CC-MAIN-2026-12,16786,17685,2531741720,155071366,49170235,2026-03-27T02:11:50Z,71,91,0,13,556
|
| 16658 |
CC-MAIN-2026-12,16800,17647,2508925923,164950819,50682518,2026-03-27T02:04:20Z,143,150,1,9,592
|
| 16659 |
CC-MAIN-2026-12,16801,17566,2478259428,162118722,50673423,2026-03-27T02:06:40Z,150,142,2,8,586
|
| 16660 |
CC-MAIN-2026-12,16802,17507,2525695824,158872992,48167412,2026-03-27T02:09:10Z,120,134,1,7,589
|
| 16661 |
+
CC-MAIN-2026-12,16803,17470,2493030494,161154116,50516050,2026-03-27T02:11:50Z,0,106,3,13,619
|
| 16662 |
+
CC-MAIN-2026-12,16804,17428,2499858535,158519861,49184319,2026-03-27T02:14:20Z,0,143,1,0,615
|