2 Answers2025-08-18 09:25:33
I’ve been uploading ebooks to Amazon for years, and the whole EPUB-to-MOBI conversion thing is a bit of a messy topic. Back in the day, Amazon’s Kindle Direct Publishing (KDP) only accepted MOBI files, so converting EPUB was a must. But things changed in 2022—Amazon phased out MOBI uploads for new titles and now prefers EPUB or KPF (Kindle Package Format) files. Here’s the kicker: if you convert an EPUB to MOBI yourself and upload it, Amazon’s system might still process it, but it’s not guaranteed. Their auto-conversion from EPUB usually works better than a pre-converted MOBI, especially since MOBI lacks some newer formatting features.
The real headache comes with older MOBI files. If you’re trying to publish a backlist title or update an existing book, Amazon might accept your MOBI, but it’s risky. I’ve seen cases where MOBI uploads get flagged for formatting issues that wouldn’t happen with EPUB. My advice? Skip the conversion step entirely and stick with EPUB. Amazon’s own conversion tools are surprisingly decent these days, and you’ll avoid weird font or layout glitches. Plus, EPUB supports stuff like fixed-layout children’s books or complex textbooks, which MOBI butchers.
4 Answers2025-07-15 11:15:16
I can confirm Amazon does accept EPUB to MOBI conversions, but there's a catch. Amazon's Kindle Direct Publishing (KDP) platform prefers EPUB for uploads now, as MOBI is being phased out for newer Kindle features. However, if you have an older MOBI file, you can still upload it, but EPUB is the recommended format for better compatibility.
I've personally converted EPUB to MOBI using tools like Calibre, and it works seamlessly for personal use. But if you're publishing, stick to EPUB. Amazon’s conversion system handles EPUB files more efficiently, preserving formatting, fonts, and even complex layouts. For sideloading, MOBI works fine on older Kindles, but newer models like the Paperwhite or Oasis handle EPUB directly or through Amazon’s 'Send to Kindle' service, which auto-converts it to a Kindle-friendly format.
4 Answers2025-08-16 13:16:03
I can share my experience with file formats. Amazon’s Kindle Direct Publishing (KDP) platform primarily prefers files in .mobi format for Kindle devices, but they also accept .epub files now. However, if you convert an .epub to .mobi yourself, you need to ensure the formatting stays intact. Amazon’s own conversion system is quite robust, so uploading an .epub directly might be smoother.
I’ve tried both methods, and while manually converted .mobi files sometimes work, they can have formatting quirks like odd line breaks or misplaced images. Amazon’s system tends to handle .epub better these days, so I’d recommend uploading in that format and letting KDP convert it. Just make sure to preview your book thoroughly using their online viewer before publishing.
3 Answers2025-07-14 01:57:54
I always stick to EPUB. Amazon's Kindle Direct Publishing (KDP) actually prefers EPUB these days. They used to require MOBI, but since mid-2022, EPUB became the recommended format because it's more versatile and handles complex layouts better. MOBI is outdated now, though Amazon still accepts it for older Kindle devices. I've tested both formats extensively, and EPUB consistently gives cleaner results with fewer formatting issues. Just make sure your EPUB follows Amazon's guidelines—proper metadata, validated file, and no DRM. If you upload EPUB, Amazon automatically converts it to KFX (their newest format) for better reading experiences on modern Kindles.
2 Answers2025-07-08 02:53:52
the whole conversion thing can be a bit of a maze. Amazon does support converting files to MOBI, but it's not as straightforward as it used to be. Back in the day, you could email a document to your Kindle address, and it would automatically convert to MOBI. Now, Amazon has shifted focus to their newer format, AZW3, but MOBI still works for most older Kindle devices. The trick is to use the 'Send to Kindle' feature or the Kindle Personal Documents Service. Just make sure your file isn't DRM-protected, or it won't convert.
One thing that bugs me is the lack of clarity from Amazon about which formats are fully supported. MOBI files can still be sideloaded via USB, but they won't sync across devices like AZW3 or KFX files do. If you're using Calibre, you can manually convert to MOBI, but the formatting might get wonky. Amazon’s support pages are a bit vague, but from my experience, MOBI conversion is hanging on by a thread—functional but not future-proof.
2 Answers2025-08-10 13:31:58
the shift away from MOBI has been one of the most significant changes. Remember when MOBI was the golden standard for Kindle? Those days are long gone. Amazon officially stopped supporting new MOBI uploads in 2022, which hit a lot of indie authors like a ton of bricks. The company's pushing hard for KPF (Kindle Package Format) now, which honestly offers better typography and layout options.
What's wild is how many people still try uploading MOBI files out of habit. The Kindle Direct Publishing platform straight-up rejects them with a message nudging you toward EPUB. It's not just about file formats—this reflects Amazon's strategy to control the entire ebook ecosystem. EPUB gives them more flexibility to enforce DRM and standardize the reading experience across devices. For us readers, the transition's mostly invisible, but for authors, it's been a headache requiring complete workflow overhauls.
2 Answers2025-08-16 09:35:52
Amazon's Kindle Direct Publishing (KDP) platform is pretty specific about file formats. They don’t directly accept PDF-to-MOBI conversions anymore because MOBI is outdated for new uploads. Amazon phased out MOBI support in favor of EPUB and KPF formats. If you upload a MOBI file, it’ll still work for older Kindle devices, but you’re better off converting your PDF to EPUB first. Calibre is a lifesaver for this—it’s free, easy to use, and handles conversions cleanly.
One thing to watch out for is formatting. PDFs are rigid, so text and images might get messy during conversion. EPUB fixes this by reflowing content, making it adaptable for different screen sizes. Amazon’s own conversion tool can sometimes butcher complex layouts, so I always recommend tweaking the EPUB manually before uploading. If you’re publishing, stick to EPUB; if it’s for personal use, MOBI works but isn’t future-proof.
4 Answers2025-07-14 17:15:51
I can tell you that Amazon's Kindle Direct Publishing (KDP) has shifted its focus away from MOBI files. They now prefer EPUB format for uploading books, as it offers better compatibility and features. However, if you convert an EPUB to MOBI using tools like Calibre, the resulting MOBI file might still work for personal use, like sideloading onto a Kindle device via USB. But for publishing on KDP, MOBI files are no longer accepted as of 2022. If you're looking to publish, stick with EPUB—it's the way forward.
For those who already have MOBI files, it's worth noting that Amazon's guidelines explicitly state EPUB is the required format for new submissions. Older MOBI files might still be in circulation, but they won't be accepted for new uploads. The shift to EPUB ensures better typography, layout control, and overall reading experience. So, if you're converting files, focus on EPUB output rather than MOBI to stay aligned with Amazon's current standards.
3 Answers2025-08-10 19:11:42
it's pretty straightforward when it comes to supported formats. The main ones are MOBI and AZW, which are Amazon's own formats. EPUB used to be a no-go, but recently Kindle started supporting it, which is a game-changer for me since most of my books are in that format. PDFs work too, but they don’t reflow as nicely as the others. If you’re sideloading books via USB, you can also use TXT or DOCX files, though the formatting might need some tweaking. I usually stick to MOBI or EPUB for the best reading experience.
4 Answers2025-08-03 11:00:38
I can confidently say that Amazon Kindle doesn't directly support uploading EPUB files online. The Kindle ecosystem primarily works with its proprietary formats like AZW or MOBI. However, there's a workaround that many avid readers use. You can convert EPUB files to MOBI or AZW3 using free tools like Calibre before uploading them to your Kindle via USB or email.
Amazon also provides a 'Send to Kindle' email service where you can attach converted files, but it still requires that conversion step first. The process is smoother than people think, and once you get the hang of it, you'll have access to a vast library beyond Amazon's store. I've personally uploaded hundreds of books this way, especially niche titles not available on Kindle Store. Just remember to use your Kindle's unique email address for the 'Send to Kindle' feature.