CloudConvert
Online file converter supporting EPUB, MOBI, AZW3, PDF, and DOCX, with an API for batch automation and nothing to install.
Best for: Authors needing a quick one-off ebook conversion, or API-driven batch conversion, without installing software
Cheaper than 0 of 11 tools · periods vary
Tools at this price point typically fit a Under $300 Stack (Under $300 total).
Details
- Tool Type
- Conversion Tool
- Formats Supported
- Epub, Mobi, Azw3, Pdf, Docx, Html, Txt
- Platform
- Web
Limitations
- Privacy tradeoff: Your manuscript is uploaded to CloudConvert's servers for processing — a real consideration for unpublished work. The company states files are deleted after a few hours, but desktop tools like Calibre, Pandoc, or Sigil keep everything local
- Costs can add up: The credit model can get expensive and confusing for high-volume users
- Not a formatter: It converts files; it doesn't design or theme your book's interior
CloudConvert is a browser-based file converter with unusually good ebook-format coverage — it handles EPUB, MOBI, AZW3, PDF, and DOCX among hundreds of formats, and uses Calibre under the hood for some ebook conversion paths. For authors who just need a single conversion and don't want to install desktop software, it's fast and frictionless, and its API makes it a fit for automated, batch workflows.
Why Authors Use It
- Best for: Authors who need a quick one-off conversion in the browser, or developers automating conversions through the API
- No install: Runs entirely in the browser on any operating system — nothing to download or maintain
- Strong ebook support: Converts to and from EPUB, MOBI, AZW3, PDF, DOCX, HTML, and TXT, with options to tune the output
- Automation-friendly: A documented REST API and integrations (Zapier, etc.) let you build conversions into a larger pipeline
Pricing
- Free tier: A daily allowance of conversions with no signup required, enough for occasional one-off jobs
- Paid plans: Credit- and subscription-based pricing that starts around $8/month and scales with conversion volume; heavy or automated use costs more
Limitations
- Privacy tradeoff: Your manuscript is uploaded to CloudConvert's servers for processing — a real consideration for unpublished work. The company states files are deleted after a few hours, but desktop tools like Calibre, Pandoc, or Sigil keep everything local
- Costs can add up: The credit model can get expensive and confusing for high-volume users
- Not a formatter: It converts files; it doesn't design or theme your book's interior
Alternatives
- Calibre (free) — the local, private alternative that powers some of CloudConvert's ebook conversions anyway
- Pandoc (free) — a scriptable local converter for authors who prefer to keep files off third-party servers
More Formatting & Layout Tools
Showing 3 of 19 alternatives
See all 19 toolsCalibre
Free open-source ebook library manager, format converter, and EPUB editor supporting 20+ file types. Runs on Windows, Mac, and Linux.
Also offers Conversion Tool
- Best For:
- Tech-savvy authors managing ebook libraries or converting between 20+ file formats
Pandoc
Free, open-source command-line converter that turns Markdown, DOCX, LaTeX, and 40+ formats into clean EPUB, PDF, and HTML.
Also offers Conversion Tool
- Best For:
- Technical and nonfiction authors who draft in Markdown and want scriptable, batch conversion pipelines
Storyloft
Browser-based all-in-one author suite with an AI writing assistant, illustration tools, and a formatter that exports EPUB and print-ready PDF.
Also offers Freemium
- Best For:
- Authors who want a single browser-based pipeline that takes a manuscript from AI-assisted drafting through to formatted EPUB and print-ready PDF
Complete Your Toolkit
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