How many sites publish an llms.txt file, and who is publishing them?
Valid llms.txt files appeared on 2.13% of desktop sites and 2.1% of mobile sites in the Web Almanac 2025 crawl, and the Almanac traces 39.6% of llms.txt files to All in One SEO. Updated October 18, 2026.
By Martin DejnickiUpdated
Short answer
Valid llms.txt files were found on 2.13% of desktop sites and 2.1% of mobile sites in the HTTP Archive Web Almanac 2025 crawl, 258,357 and 324,184 files respectively. The Almanac traces 39.6% of llms.txt files to the SEO plugin All in One SEO and 3.6% to Yoast, from the comments the plugins leave in files they generate. The figures are web-wide; no Shopify-only share is claimed.
The Web Almanac traces 39.6% of llms.txt files to All in One SEO, 11 times the 3.6% for Yoast
Share of llms.txt files carrying each SEO plugin's default comment, web-wide, Web Almanac 2025; other files are not shown
- Valid llms.txt files were found on 2.13% of desktop sites and 2.1% of mobile sites in the Web Almanac 2025 crawl.
- Figures are web-wide; no Shopify-only share is claimed.
- Only these two plugins are reported, so the bars are not a full split: the dataset does not say which generator, if any, produced the other files.
Source: HTTP Archive, Web Almanac 2025, Generative AI and SEO chapters and SEO results data. Read on .
What this means for your decision
- Deciding whether to spend time on llms.txt? Valid files appear on 2.13% of desktop sites and 2.1% of mobile sites in the Web Almanac 2025 crawl. The dataset records publication only and says nothing about whether any AI system reads the files or cites the sites that publish them.
- Reading who publishes them? The Almanac traces 39.6% of llms.txt files to All in One SEO and 3.6% to Yoast, from the comments the plugins leave in files they generate. Much of the adoption reflects a plugin feature, so do not read the share as a count of deliberate decisions.
- Benchmarking a Shopify store? The figures are web-wide, and the dataset holds no Shopify-only share, so do not read 2.13% as a Shopify rate.
- Counting files? The desktop and mobile counts, 258,357 and 324,184 valid files, come from separate crawls, so do not add them together.
Which SEO plugins generate llms.txt files?
The HTTP Archive Web Almanac 2025 relates 39.6% of llms.txt files web-wide to the SEO plugin All in One SEO and 3.6% to Yoast. It identifies each plugin from the comment the plugin leaves by default in files it generates. The Web Almanac data in this dataset does not break down the remaining files by generator.
Two plugins are in the dataset. The Almanac counts a file under a plugin when the file carries that plugin's default comment.
How many sites publish a valid llms.txt file?
Valid llms.txt files appeared on 2.13% of desktop sites, 258,357 files, and 2.1% of mobile sites, 324,184 files, in the HTTP Archive Web Almanac 2025 crawl. The figures are web-wide and describe publication, not use. The two counts come from separate desktop and mobile crawls, so they are not added together.
Mobile had more valid files than desktop but a slightly lower share. Because the share is files over sites crawled, the mobile crawl covered more sites.
What do the llms.txt figures not show?
The figures show publication, not effect. The Web Almanac 2025 counts valid llms.txt files on 2.13% of desktop sites and 2.1% of mobile sites, and the dataset says nothing about whether any AI system reads them or cites more of the sites that publish one. The dataset also does not break down the remaining files by generator.
Weigh the effort of maintaining a file against what you know about the AI systems you care about. This page supplies the adoption figure only.
The data
Each chart on this page is drawn from the numbers below. Units are in the column headers.
| Plugin | Share of files related to the plugin (%) |
|---|---|
| All in One SEO | 39.6 |
| Yoast | 3.6 |
Download llms.txt adoption and generators, Web Almanac 2025 as CSV · All 5 columns on the dataset page
Methodology
Reading the chart: The Web Almanac traces 39.6% of llms.txt files to All in One SEO, 11 times the 3.6% for Yoast
- Valid llms.txt files were found on 2.13% of desktop sites and 2.1% of mobile sites in the Web Almanac 2025 crawl.
- Figures are web-wide; no Shopify-only share is claimed.
- Only these two plugins are reported, so the bars are not a full split: the dataset does not say which generator, if any, produced the other files.
Caveats: llms.txt adoption and generators, Web Almanac 2025
- Figures are web-wide; no Shopify-only share is claimed.
- The dataset counts publication of a valid llms.txt file. It says nothing about whether any AI system reads or uses the files.
- The plugin shares are the share of llms.txt files carrying the plugin's default comment, which the plugin leaves in files it generates. The dataset does not break down the remaining files by generator.
- Desktop and mobile come from separate crawls with different site counts, so the two file counts are not added together.
Deploi's charts and compilation are licensed CC BY 4.0. The underlying facts belong to their sources, which are named on every page. How Deploi Shopify Data works.
Sources
Tier A sources are primary documents: filings, official releases and official price pages. How sources are ranked.
- Tier BGenerative AI | 2025 | The Web Almanac by HTTP Archive
HTTP Archive (Web Almanac) · HTML · Read on
- Tier BSEO | 2025 | The Web Almanac by HTTP Archive
HTTP Archive (Web Almanac) · HTML · Read on
- Tier BWeb Almanac 2025 SEO results, llms.txt validity tab (gid 1895020036)
HTTP Archive (Web Almanac) · TEXT · Read on
Cite and reuse
Deploi's charts and compilation are licensed CC BY 4.0. The underlying facts belong to their sources, which are named on every page.
APA
Deploi. (2026). How many sites publish an llms.txt file, and who is publishing them? [Web page]. https://deploi.ca/shopify/data/llms-txt-adoption Retrieved October 18, 2026.
BibTeX
@misc{deploi_llms_txt_adoption_2026,
author = {{Deploi}},
title = {How many sites publish an llms.txt file, and who is publishing them?},
year = {2026},
url = {https://deploi.ca/shopify/data/llms-txt-adoption},
note = {Accessed 2026-10-18}
}Embed this chart
Embed code
<iframe src="https://deploi.ca/embed/shopify/data/llms-txt-generators" title="The Web Almanac traces 39.6% of llms.txt files to All in One SEO, 11 times the 3.6% for Yoast" loading="lazy" style="width:100%;height:550px;border:0"></iframe> <p style="font:12px/1.4 Arial,sans-serif;margin:4px 0 0">Source: <a href="https://deploi.ca/shopify/data/llms-txt-adoption#chart-llms-txt-generators">Deploi, The Web Almanac traces 39.6% of llms.txt files to All in One SEO, 11 times the 3.6% for Yoast</a></p>
Keep the credit line under the embed. It is the license condition.
Questions
What percentage of websites have an llms.txt file?
Valid llms.txt files were found on 2.13% of desktop sites and 2.1% of mobile sites in the HTTP Archive Web Almanac 2025 crawl. The figures are web-wide and include no Shopify-only share.
How many llms.txt files are there?
The HTTP Archive Web Almanac 2025 counted 258,357 valid llms.txt files in its desktop crawl and 324,184 in its mobile crawl. The two counts come from separate crawls and are not added together.
Which plugin generates the most llms.txt files?
All in One SEO, of the two plugins in the dataset. The Web Almanac 2025 relates 39.6% of llms.txt files to it and 3.6% to Yoast, from the comment each plugin leaves in files it generates. The remaining files are not broken down by generator.
Do Shopify stores publish llms.txt files?
This page cannot say. The Web Almanac 2025 figures are web-wide, 2.13% of desktop sites and 2.1% of mobile sites, and no Shopify-only share is in the dataset or claimed.
Does llms.txt help AI systems cite my site?
The dataset does not say. It records how many sites publish a valid llms.txt file in the Web Almanac 2025, 2.13% on desktop and 2.1% on mobile, and nothing about whether any AI system reads or uses them.
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Changes
- · llms.txt adoption and generators, Web Almanac 2025
First release. Shares and counts read from the Web Almanac 2025 Generative AI and SEO chapters and its SEO results sheet on October 18, 2026.