Practical guide
Editorial policy
Our first question is whether a page helps an author make a better-informed decision.
Last reviewed: 14 August 2026
Information first
Guidance is written to stand on its own. We do not publish paid rankings. There are no affiliate links at launch, and an ordinary editorial link does not imply a commercial relationship.
Sources and changing services
We prefer official standards and first-party platform documentation. External services, specifications and eligibility can change. Reviewed dates show when a page was last checked, not that every linked term will remain unchanged.
Calculator limits
Calculator results are illustrative planning estimates. Inputs and formulas are visible, ranges are used where appropriate, and results are not quotes or promises.
Corrections
If a factual error is identified, it should be checked against a primary source and corrected promptly. Material corrections should be noted on the relevant page with the review date updated.
Historical-domain transparency
The domain is under new ownership. The current resource is not the former ebook-formatting company and does not reuse its claims, customer history, branding or endorsements.