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How to Convert EarthArXiv Preprints to EPUB for E-Reader Reading (2026)

EarthArXiv is a free, community-driven preprint server for the earth sciences. Launched in 2017, it hosts thousands of manuscripts covering geology, geophysics, hydrology, oceanography, climate science, and related fields — all freely downloadable as PDF before (and often after) formal peer review.

Earth science PDFs tend to be figure-heavy: geological cross-sections, maps, bathymetric charts, climate model outputs. These look fine in a PDF viewer but render poorly on an e-reader's narrow screen. Converting to EPUB gives you a readable single-column text for commuting, while the original PDF stays available on your laptop for inspecting figures.

EarthArXiv vs Other Earth Science Preprint Sources

Source	Operator	Coverage	Cost	Best for
EarthArXiv	Nonprofit community	All earth sciences	Free	Broad geoscience preprints
ESSOAr	AGU / Wiley	Earth & space sciences	Free	AGU-affiliated manuscripts
arXiv (physics/geo)	Cornell / arXiv	Physics, geo-physics, climate	Free	Quantitative earth physics
SSRN (earth sciences)	Elsevier	Multi-disciplinary incl. env.	Free (account)	Environmental economics, policy
Copernicus Discussions	Copernicus / EGU	Atmospheric, ocean, climate	Free	Open peer review preprints

Earth Science Disciplines on EarthArXiv

Geology & tectonics: stratigraphy, structural geology, mineralogy, petrology
Geophysics: seismology, geodesy, geomagnetism, gravity
Hydrology: groundwater, river systems, catchment modelling, flood risk
Oceanography: physical oceanography, marine biogeochemistry, sea-level
Atmospheric science & climatology: climate modelling, weather systems, aerosols
Geochemistry & volcanology: isotope geochemistry, eruption dynamics
Planetary science: Mars, Moon, exoplanet atmospheres
Environmental science: pollution, land-use change, ecosystem dynamics

How to Download an EarthArXiv Preprint PDF

Go to eartharxiv.org and use the search bar (or browse by subject).
Open the preprint page. Click Download or View PDF.
Alternatively, EarthArXiv preprints are indexed on the OSF (Open Science Framework) infrastructure — the PDF URL typically follows the pattern https://osf.io/preprints/eartharxiv/XXXXX.
For ESSOAr, go to essoar.org and search similarly; PDFs download with one click.
Save the PDF to your computer.

Tip: EarthArXiv preprints also appear in OpenAlex, Semantic Scholar, and Google Scholar — search from any of these and follow the EarthArXiv link to the free PDF.

How to Convert an EarthArXiv PDF to EPUB

Open toolkit.bot in your browser.
Upload the EarthArXiv PDF.
Wait for conversion — text-heavy papers convert in under 30 seconds; figure-heavy papers may take slightly longer.
Download the EPUB.
Transfer to Kindle (Send-to-Kindle email), Kobo (USB or Kobo desktop app), or open in Apple Books, Readwise Reader, or PocketBook app.

Tip for figure-heavy papers: Keep the original PDF on your device for map and cross-section inspection. Use the EPUB for reading the abstract, introduction, methods, and discussion sections during commutes.

Frequently Asked Questions

What subjects does EarthArXiv cover?

EarthArXiv covers the full range of earth sciences: geology, geophysics, geochemistry, hydrology, oceanography, atmospheric science, climatology, volcanology, paleontology, planetary science, and environmental science. Preprints from any of these disciplines can be submitted and downloaded freely.

Is EarthArXiv peer-reviewed?

No. Like all preprint servers, EarthArXiv hosts manuscripts that have not yet completed formal peer review. Papers are moderated for scope and basic quality, but findings have not been independently verified. Always check whether a preprint has subsequently been published in a peer-reviewed journal before citing.

What is the difference between EarthArXiv and ESSOAr?

EarthArXiv is an independent nonprofit server; ESSOAr (Earth and Space Science Open Archive) is run by AGU (American Geophysical Union) and Wiley. Both host earth science preprints freely. ESSOAr tends to have more AGU-affiliated submissions; EarthArXiv is broader and discipline-agnostic. You can search both for comprehensive coverage.

Can I find climate science preprints on EarthArXiv?

Yes. Climatology, climate modelling, atmospheric science, and climate impacts are among the most active topic areas on EarthArXiv. Filtering by subject or searching keywords like 'CMIP6', 'SSP scenarios', or 'climate sensitivity' returns active preprint threads.

How do I convert an EarthArXiv PDF that has maps and geological cross-sections?

Upload the PDF to toolkit.bot as normal. Raster maps and cross-sections are extracted as images and embedded in the EPUB. Vector maps may simplify. For figure-heavy geoscience preprints, keep the original PDF for detailed figure inspection and use the EPUB for reading the text and discussion sections on your e-reader.