Ebook Converter Online — Free Ebook Converter Tool
CodexFuse Team · 2026-10-28T22:19:50.723Z · 10 min read min read
Convert EPUB, FB2, TXT and HTML ebooks to EPUB, TXT, HTML or PDF free in your browser — no uploads, text-only, with honest limits.
An ebook converter is a tool that changes an ebook file from one format to another — EPUB to PDF, FB2 to EPUB, TXT to HTML — so the book opens on the reader or app you actually own. CodexFuse's free ebook converter does that conversion entirely in your browser: you drop a file in, pick an output format, check the preview, and download the result, with nothing uploaded to a server.
The frustration it solves is familiar. You download a perfectly legal, DRM-free book, double-click it, and your reader shrugs. The words are fine; the container is wrong. This article explains which format your device wants, walks through a conversion end to end, and states plainly what this converter cannot do.
What is an ebook converter?
An ebook converter rebuilds the same book text inside a different file format, so a device or app that cannot read the original format can open the new one. It does not rewrite, summarise, or edit the book; it repackages the title, headings, and paragraphs into a container the target reader understands. CodexFuse's ebook converter handles EPUB, FB2, TXT, and HTML as inputs, and produces EPUB, TXT, HTML, or PDF as outputs, all in your browser.
Why won't my ebook open on my new reader?
Usually, the answer is format support, not a broken file. Every reader and app supports a short list of formats and silently rejects the rest. A Kobo reads EPUB happily and ignores MOBI. A Kindle app prefers its own formats. A plain PDF reader opens anything saved as PDF, but loses reflowable text. Before you re-download a book or buy a new app, check the format first — it is the cheapest fix available.
Common mismatches, and the fix for each:
- FB2 file, EPUB-only reader: convert FB2 to EPUB and the book opens with chapters intact.
- EPUB file, print-or-share need: convert EPUB to PDF when you need fixed pages for printing or emailing.
- TXT file, styled reading: convert TXT to EPUB so headings and chapters behave like a real ebook instead of a wall of text.
- HTML file, offline reading: convert HTML to EPUB or PDF so a saved web article reads like a book, away from the browser.
| Format | Best for | Watch out for |
|---|---|---|
| EPUB | Most readers, phones, and tablets; reflowable text | Not supported by older Kindle hardware |
| Printing, sharing, fixed layout | Text does not reflow on small screens | |
| FB2 | Lightweight Russian-language ebook collections | Unsupported by most mainstream readers |
| TXT | Maximum compatibility, tiny file size | No chapters, styling, or metadata |
| HTML | Reading in a browser, quick edits | Not a proper ebook format on its own |
How do I convert an ebook with the CodexFuse ebook converter?
Open the ebook converter, drop your file onto the page, pick the output format, check the title and the preview of the first paragraphs, and download the converted file. The whole job takes under a minute for a typical novel, and because the conversion runs in your browser, the file never leaves your device.
- Drop the file in: drag an EPUB, FB2, TXT, or HTML file onto the page (HTM works too).
- Pick the output format: choose EPUB, TXT, HTML, or PDF depending on where the book will be read.
- Check the preview: confirm the title is right and skim the first paragraphs for garbled characters or missing chapters.
- Download and open: save the converted file, open it on the target reader, and confirm the chapters land where you expect.
Convert a copy, not your only original. Keep the source file untouched in your library folder, so you can re-convert to a different format later without hunting the book down again.
A worked example: turning an FB2 novel into an EPUB
Consider a fictional reader, Ayesha, a university student in Lahore. Her book club shares a public-domain novel as an FB2 file — 214 pages, 18 chapters, about 1.8 MB — but her tablet's reading app only opens EPUB and PDF. She does not want to install a desktop converter for one book.
She opens the ebook converter, drops the FB2 file onto the page, and selects EPUB as the output. The tool shows the book's title and a preview of the opening paragraphs, which she scans: the title is correct, chapter one starts cleanly, and there are no replacement characters. She downloads the EPUB — roughly 1.6 MB — and opens it on her tablet. All 18 chapters appear, and she can change font size and resume where she stopped, which a PDF would not have allowed as comfortably.
One thing she notices, and accepts: the original FB2 carried 12 small chapter illustrations, and none of them survive. This converter carries text only, so she keeps the FB2 original for the illustrated version and reads the EPUB for convenience. That trade-off, made knowingly before she deleted anything, is exactly how the tool is meant to be used.
What does this ebook converter not do?
Honesty here saves more time than any feature list. This ebook converter does not preserve formatting, cover art, images, fonts, or styles — it carries over text only, meaning the title, headings, and paragraphs. The EPUB it builds is a simple EPUB 2.0 package with one content chapter, and the PDF it builds is a plain Helvetica rendering of the book's words, not a pixel copy of the original pages.
It also does not accept MOBI, AZW3, or KFX files, and it cannot unlock DRM-protected books. If your file is a Kindle purchase wrapped in DRM, no browser converter will open it — that is a licensing lock, not a format problem, and the legitimate route is reading it in the app tied to the purchase. If layout matters more than portability — a cookbook, a textbook with diagrams, an illustrated edition — use a desktop converter such as Calibre instead, and treat this tool as the quick, no-install option for text-first books.
Check the preview before you download. If the first paragraphs show garbled characters, the source file's encoding is the problem, and converting it again will not fix it — re-download or re-save the source in UTF-8 first.
Which output format should I pick?
Pick by device first, and by purpose second. If the book will be read on a phone, tablet, or dedicated reader, EPUB is almost always the right call: the text reflows, fonts resize, and bookmarks behave. If the book must be printed, emailed to someone who will not install a reader, or archived exactly as it looks, PDF wins despite its rigid pages.
TXT is the fallback when nothing else matters except opening the file — it works everywhere and costs almost nothing in size, but you lose chapters and styling. HTML suits a book you plan to edit or publish on the web. When in doubt, convert to EPUB, keep the original, and convert again later; the cost of a second conversion is about thirty seconds.
Convert it in your browser with CodexFuse's free ebook converter, then keep your whole digital library on one fully managed platform — hosting, backups, and security handled for you, on pay-as-you-go credits with no subscription.
Get Started with CodexFuseHow does this fit a tidier digital library?
A conversion is a small job; a library is a long-term one. The readers who run into format problems most often are the ones with books scattered across downloads folders, old phones, and email attachments. A simple system fixes that: one master folder for originals, one folder for converted copies, and file names that include author and title so a search finds the book in seconds.
That is also where a managed platform earns its keep. Instead of babysitting storage, backups, and security yourself, CodexFuse hosts your site and files on a fully managed setup: you buy credits, you use what you need, and the maintenance — updates, monitoring, backups — is handled for you rather than billed as a monthly subscription you forget to cancel. Start by moving the folder that holds your converted library onto your CodexFuse hosting, turn on backups for that space, and set a rule for yourself: every new book gets converted, renamed, and filed the same day it arrives. The same discipline that keeps a library usable keeps a business's documents usable — and readers who also run a site can apply the same workflow to the documents they publish, using tools like the text-to-speech tool to hear a draft read aloud, or the document Q&A tool to query a long document before converting it.
If you work with text files often, the text-to-table converter turns delimited text into clean tables, and the rich text editor is a quick way to format text before it becomes an ebook.
Frequently Asked Questions
Can I convert EPUB to PDF for free?
Yes. Drop the EPUB into the ebook converter, choose PDF, check the preview, and download. The PDF is a plain-text rendering — title, headings, and paragraphs in Helvetica — so it prints and shares well, but it will not reproduce the original's images or styling.
Can I convert a Kindle book (MOBI or AZW3)?
No. MOBI, AZW3, and KFX files are not accepted, and DRM-protected books cannot be converted because the tool reads the file's text directly and cannot unlock DRM. Only DRM-free EPUB, FB2, TXT, and HTML files work.
Does the converter keep my book's images and formatting?
No. It carries text only. Cover art, images, fonts, and styles are dropped, and the EPUB output is a simple single-chapter package. For illustrated books where layout matters, a desktop converter like Calibre is the better choice.
Is my ebook uploaded anywhere?
No. The conversion runs entirely in your browser with no server involved, so the book never leaves your device. Nothing is stored, and there is no conversion history to clear.
Which formats can I convert between?
Inputs are EPUB, FB2, TXT, HTML, and HTM. Outputs are EPUB, TXT, HTML, and PDF. Every combination of those lists works — EPUB to PDF, FB2 to EPUB, TXT to EPUB, HTML to TXT, and the rest.
What should I do if the converted book looks wrong?
First, check the preview's first paragraphs before downloading — garbled text usually means a source encoding problem, not a conversion bug. If the text is fine but the layout is missing, that is expected: this is a text-only converter. Keep the original and re-convert, or switch to a desktop tool for layout-sensitive books.
Stop fighting file formats and start reading
Your reader is not broken, and your book is not lost — they just speak different formats. Convert the file, check the preview, keep the original, and move on to the reading. If you run a website, a shop, or a small team alongside your reading habit, bring the same no-drama approach to the rest of your IT: move your hosting, email, security, and backups to CodexFuse, where everything is fully managed on pay-as-you-go credits and you stop babysitting servers. Open the free ebook converter, fix the one book in front of you, then get started with CodexFuse and let the platform handle the infrastructure while you get back to the book.