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Converted on secure servers

FictionBook FB2 to EPUB Converter

FictionBook FB2 is converted by Calibre ebook-convert into EPUB, preserving book structure for fb2-to-epub.

Free anonymous limits

Free without signing in: 10 server conversions per day, 10 MB each. Browser-only conversions stay on this device and do not count against server limits.

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Supported formats

.fb2 → .epub

Conversion engine

calibre

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Pair-specific

Features & use cases

Features

  • FictionBook FB2 is converted by Calibre ebook-convert into EPUB, preserving book structure for fb2-to-epub.
  • Title, author, language, publisher, cover, and table-of-contents metadata are copied when the source exposes them.
  • Chapter XHTML, images, links, and CSS are normalized; reader-specific typography can change in the destination.
  • EPUB and FB2 keep reflowable book semantics better than fixed page geometry.

Use cases

  • Prepare FB2 files for tools that expect EPUB.
  • Create reviewable samples for support tickets, tests, and data handoffs.
  • Batch recurring file chores while keeping warnings attached to each output.
  • Normalize partner or archive files without installing desktop conversion software.

See real results

Original

Orders.xlsx

Orders
Order IDCustomerTotalPaidShip date
1001Northwind Ops1294.50TRUE2026-09-03
1002Atlas Finance488.75FALSE2026-09-04
1003Studio Blue73.10TRUE2026-09-05
Sheet tab: Orders

Converted

Pretty preview

Order ID,Customer,Total,Paid,Ship date
1001,Northwind Ops,1294.5,true,2026-09-03
1002,Atlas Finance,488.75,false,2026-09-04
1003,Studio Blue,73.1,true,2026-09-05
3 rows
values only
0.4 s
in-browser
Try this conversion

What actually changes

FictionBook FB2 is converted by Calibre ebook-convert into EPUB, preserving book structure for fb2-to-epub.
Title, author, language, publisher, cover, and table-of-contents metadata are copied when the source exposes them.
Chapter XHTML, images, links, and CSS are normalized; reader-specific typography can change in the destination.
EPUB and FB2 keep reflowable book semantics better than fixed page geometry.
DRM-protected ebooks are not supported; the converter must be able to read the uploaded book bytes.
Outputs for DOCX, TXT, HTML, or Markdown are extracted from ebook chapters rather than designed page replicas.

Example

input
FictionBook FB2 ebook with cover, metadata, navigation, and chapters
output
EPUB ebook with converted book structure and reader-specific styling

Do it in code

cli
ebook-convert input.fb2 output.epub

FAQ

Does this remove DRM?

No. DRM-protected ebooks are not supported and must be unlocked by rights holders before conversion.

Will my cover and table of contents survive?

Calibre preserves cover art, metadata, and navigation when the source includes them in a readable form.

Is MOBI the same as AZW3?

No. MOBI is older and more limited; AZW3/KF8 supports richer Kindle styling.

Can I set PDF paper size?

This pair does not produce PDF, so paper_size is not honoured.

Will page numbers stay the same?

Reflowable ebook conversions do not preserve fixed page numbers because readers repaginate text.

Related conversions

TXT to EPUBMD to EPUBHTML to EPUBDOCX to EPUBODT to EPUBRTF to EPUBRST to EPUBLATEX to EPUBMOBI to EPUB

Everything you need

Browser-first privacy

CSV, JSON, XML, YAML, XLSX, and table conversions run locally when the source and target formats support it.

Warnings, not surprises

Formula drops, flattened arrays, sheet selection, and layout changes are surfaced as conversion warnings.

Batch and zip

Queue multiple files, download individual results, or package them into a zip for handoff.

API, CLI, MCP

Convert from browsers, scripts, automations, and AI assistants with the same warnings and outputs.

Team workspaces

Shared history, API keys, limits, and retention settings keep production conversions controlled.

Retention you control

Browser files never upload; server inputs auto-delete within 24 hours and outputs follow workspace retention.

Comparison

Why teams switch

Decision point
FileTypeConverters
Upload-only converters
Where data files are processed
CSV, JSON, YAML, XML, and spreadsheet files can convert in your browser.
Most tools upload every file to their servers first.
What you learn about fidelity
Warnings call out flattened arrays, dropped formulas, selected sheets, and layout changes.
Downloaded files often arrive with no explanation of what changed.
Batch + zip
Batch files and download individual results or one zip.
Batching is often paid-only or missing.
API, CLI, and MCP
Use the web app, automation, or an AI assistant with the same conversion behavior.
Many converters are web-form only.
Retention control
Browser files never upload; server inputs are deleted within 24 hours.
Retention is usually unclear or not configurable.
Price
Start with free browser conversion and clear paid limits.
Limits are often hidden behind upload steps or subscriptions.

Where data files are processed

FileTypeConverters: CSV, JSON, YAML, XML, and spreadsheet files can convert in your browser.

Upload-only converters: Most tools upload every file to their servers first.

What you learn about fidelity

FileTypeConverters: Warnings call out flattened arrays, dropped formulas, selected sheets, and layout changes.

Upload-only converters: Downloaded files often arrive with no explanation of what changed.

Batch + zip

FileTypeConverters: Batch files and download individual results or one zip.

Upload-only converters: Batching is often paid-only or missing.

API, CLI, and MCP

FileTypeConverters: Use the web app, automation, or an AI assistant with the same conversion behavior.

Upload-only converters: Many converters are web-form only.

Retention control

FileTypeConverters: Browser files never upload; server inputs are deleted within 24 hours.

Upload-only converters: Retention is usually unclear or not configurable.

Price

FileTypeConverters: Start with free browser conversion and clear paid limits.

Upload-only converters: Limits are often hidden behind upload steps or subscriptions.

Choose your plan

Free

$0/mo

50 conversions/month

  • 50 conversions/mo
  • 25 MB max file
  • No signup required
Get started

Starter

POPULAR

$8.99/mo

For regular conversion work

2-day trial for paid plans

  • 500 conversions/mo
  • 100 MB max file
  • API + MCP
Start free trial

Pro

$29.99/mo

For heavy teams

  • 5,000 conversions/mo
  • 1 GB max file
  • API + MCP
Start free trial