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Converters8 file families · 44 direct conversions
What changes in a conversionarrow_forward
image57 formats
Image Converterarrow_forwardPhotos, screenshots, icons and graphics. Change format, cut size for the web, or rescue iPhone HEIC photos.
swap_horizPopularall 7
HEIC → JPGAVIF → JPGBMP → JPG
movie30 formats
Video Converterarrow_forwardScreen recordings, phone clips and exports. Re-wrap or re-encode for any player, or pull audio and GIFs out.
swap_horizPopularall 10
Video → GIFAVI → MP4GIF → MP4
graphic_eq42 formats
Audio Converterarrow_forwardVoice memos, podcasts and music. Go lossless for editing or compact for sharing, without touching quality twice.
swap_horizPopularall 7
AAC → MP3FLAC → M4AFLAC → MP3
description28 formats
Document Converterarrow_forwardContracts, spreadsheets and reports. Make PDFs editable, lock Word files into PDFs, or pull clean data out of tables.
swap_horizPopularall 8
Image → PDFPDF → JPGPresentation Converter
menu_book11 formats
Ebook Converterarrow_forwardBooks and long reads. Move titles between Kindle, Kobo and Apple Books, or read them right here in the browser.
swap_horizPopularall 0
folder_zip16 formats
Archive Converterarrow_forwardBundles of files. Open RAR and 7Z without installing anything, or repack into ZIP so anyone can open it.
swap_horizPopularall 4
RAR → ZIP7Z → ZIPTAR.GZ → ZIP
font_download8 formats
Font Converterarrow_forwardTypefaces for design and the web. Turn desktop fonts into fast WOFF2 for sites, or back into TTF for apps.
swap_horizPopularall 4
TTF → WOFF2OTF → TTFWOFF2 → TTF
slideshow10 formats
Presentation Converterarrow_forwardDecks from PowerPoint, Keynote and Google Slides. Swap between them or flatten into a PDF anyone can open.
swap_horizPopularall 4
PPTX → PDFKEY → PPTXPPT → PPTX
Compressors8 file types · same format, smaller fileAlso:GIF Compressor·SVG Optimizer
How compression worksarrow_forward
imagearrow_forward
Image CompressorHit a KB target with measured SSIM
targetKB target or quality
JPGPNGWebPGIF
moviearrow_forward
Video CompressorFit a size limit with corrective passes
targetMB limit or preset
MP4MOVMKVAVI
graphic_eqarrow_forward
Audio CompressorBitrate against the measured cut-off
target32-320 kbps
MP3WAVFLACAAC
descriptionarrow_forward
Document CompressorResample scans, recompress streams
targetImage dpi
PDFDOCXODT
co_presentarrow_forward
Presentation CompressorShrink the photos and media inside slides
targetImage size in slides
PPTXPPTODP
menu_bookarrow_forward
Ebook CompressorSmaller EPUBs without losing chapters
targetImage quality
EPUBMOBIAZW3
folder_ziparrow_forward
Archive CompressorPack files at the best ratio
targetMethod and level
ZIP7ZTARGZ
text_fieldsarrow_forward
Font CompressorWeb-ready fonts for fast loading
targetOutput and subset
TTFOTFWOFFWOFF2
Tool hubs9 hubs · every tool, grouped, with an inspector on each
imageImage toolsEdit, crop, resize, redact and inspect photoscodec bake-offarrow_forwardmovieVideo toolsTrim, edit, compress and turn clips into GIFscontainer inspectorarrow_forwardgraphic_eqAudio toolsClip, join, record, mix and measure loudnessLUFS meterarrow_forwardpicture_as_pdfPDF toolsMerge, split, sign, protect and watermark PDFsstructure inspectorarrow_forwarddescriptionDocument toolsWord, Excel and CSV files, read down to the XMLhidden-data checkarrow_forwardmenu_bookEbook toolsEPUB, MOBI and comics checked and convertedreflow labarrow_forwardfolder_zipArchive toolsOpen, check and rebuild ZIP, TAR and 7Z safelysafety inspectorarrow_forwarddata_objectDeveloper toolsJSON, Base64, regex, hashes, JWT, colour and DNS20+ toolsarrow_forwardcalculateCalculatorsInterest, loans, VAT, dates, percentages and paceexact mathsarrow_forward
REFERENCEdictionaryFormats explainedWhat each format is forarrow_forwardschoolCore conceptsCodecs, containers, compressionarrow_forwardmemoryHow processing worksWhat happens to your filearrow_forward
GUIDESchecklistHow-to guidesStep-by-step walkthroughsarrow_forwarddevicesPlatform guidesTips for iPhone, Windows, Macarrow_forwardcompareComparisonsTwo formats measured side by sidearrow_forward
newspaperBlogNews, release notes and deep divesarrow_forward
lightbulbpopular comparisonJPG vs PNG: which one should this picture be?Measured on real photos, logos and screenshots, with a rule you can apply in a second.Read the comparisonarrow_forward
home/ebook/epub-to-mobi

Convert EPUB to MOBI - Free Online Tool

Before you make a MOBI: which Kindle is it for?

Amazon stopped accepting MOBI through Send to Kindle in 2022; newer Kindles take EPUB directly and convert it themselves. MOBI is still the right answer for older e-readers and for sideloading over USB. Pick your device and the delivery route to see what you actually need.

menu_bookKindle Keyboard / 42010-2012
auto_storiesPaperwhite 1-32012-2017
tabletPaperwhite 5 / Scribe2018 and newer
devicesOther e-readerKobo, PocketBook, old apps
how it gets there
alternate_emailEPUB onlySend to KindleEmail or the app: Amazon converts in the cloud.
usbAZW3USB cableDrag the file into the Kindle’s documents folder.
phone_androidAZW3Reading appKindle app, or a third-party reader on a phone.
route
novel.epubarrow_forwardFileFormerarrow_forwardnovel.azw3arrow_forwardUSB → documents/arrow_forwardPaperwhite 1-3arrow_forward
recommendationAZW3, with MOBI insidePaperwhites from 2012 read AZW3. We add a classic MOBI section inside the same file as a fallback.
check_circleModern formatting on the devicecheck_circleFalls back cleanly on older firmwarecheck_circleCover shown in the libraryinfoCopy to the documents folder, not books
auto_storiesConvert to AZW3
~/convert-and-count

Convert it, then count what came through.

Chapters, words, styling, cover and metadata are counted in your book, and again in the converted file after reading it back. DRM-protected books are detected and refused. Everything happens in this tab.

folder_openOpen bookauto_storiesSample EPUB
The ebook engine failed to load: Failed to fetch dynamically imported module: http://127.0.0.1:9777/js/main/general/ebook-engine.jsEPUB, MOBI (PalmDOC), FB2, or a document: DOCX, ODT, RTF, HTML, Markdown, TXT. Identified by its bytes.
arrow_forward
convert to
.epub.fb2.pdf.docx.html.md.txt
EPUB 3 with an EPUB 2 toc.ncx for older readers: one XHTML file per chapter, nav document, cover page, stylesheet.
swap_horizConvert to .epubdownload ·
What came through waiting for a book
Open a book, or the sample EPUB (three short chapters, a cover and metadata, written by this page).
Counted twice: in your book, then in the result
menu_bookChaptersSpine items and their order, compared one by one.
notesWordsEvery chapter’s text counted, so dropped paragraphs show.
format_boldStylingHeadings, bold, italics and lists, tag by tag.
imageCoverWhether the cover image is still found and marked as the cover.
badgeMetadataTitle, author, language and identifier, field by field.
tocContentsTable-of-contents entries and where each one points.
partin your bookread backstatushow
lockAbout DRM: books bought from stores like Kindle or Kobo are usually copy-protected. This page reads encryption.xml and the MOBI header and refuses encrypted books; font obfuscation (used by many DRM-free EPUBs to protect embedded fonts) is not DRM and is allowed.
~/an-older-format
MOBI is from 2005. Modern EPUB styling doesn't all fit.
EPUB is built on modern web code. Classic MOBI understands only a small, old subset of it, so embedded fonts, floating images and tables get simplified. Turn a feature on to see how the same page looks in each format.
Embedded fontsdropped in MOBIFloating imagestacked in MOBITableflattened in MOBIFootnoteskept as links
EPUBas designed
Chapter 3 · The Crossing
The ferry left at dawn. By the time the harbour lights went out behind them, the island had already become a line of grey on the water.
She counted the gulls.1 Nine, then twelve.
classic MOBIfont replaced
Chapter 3 · The Crossing
The ferry left at dawn. By the time the harbour lights went out behind them, the island had already become a line of grey on the water.
She counted the gulls.1 Nine, then twelve.
~/mobi-azw-kfx
MOBI, AZW3, KFX: three generations of Kindle file.
"MOBI" is often used for all Kindle books, but they're distinct formats. We can create the first two. KFX is made only by Amazon's own tools and store, so if you need that, send an EPUB and let Amazon convert it.
MOBI2005
Opens on the oldest Kindlescheck_circleEmbedded fontscancelModern CSScancelSend to Kindlecancel
The original Mobipocket format. Maximum compatibility, minimum styling.we create it
AZW3 (KF8)2011
Opens on the oldest KindlescancelEmbedded fontscheck_circleModern CSScheck_circleSend to Kindlecancel
Brought EPUB-like styling to Kindle. The best sideloading format today.we create it
KFX2015
Opens on the oldest KindlescancelEmbedded fontscheck_circleModern CSScheck_circleSend to Kindlecheck_circle
Amazon’s current format, with better typesetting. Made only by Amazon.send EPUB instead
~/we-check-first
Four things we check in the EPUB first.
Most failed Kindle conversions come from one of these. We look for them and fix what can be fixed automatically.
lockDRMStore-bought EPUBs with copy protection can’t be converted. We tell you straight away.Buy DRM-free, or read in the store’s own app.
imageCover imageKindles show a blank cover if it isn’t marked correctly in the EPUB.We detect the cover and set it explicitly.
tocTable of contentsSome EPUBs only have an HTML contents page, so the Kindle Go To menu is empty.We rebuild a navigable one from the headings.
photo_size_select_largeHuge imagesHigh-resolution photos make the file too big for older devices.We resize them to the screen size.
~/other-routes
Other ebook conversions.
Neighbouring tools, with a typical result for each.
picture_as_pdfEPUB to PDFA fixed-layout copy for printing or reading on a laptop.novel.epubarrow_forwardnovel.pdfmenu_bookEbook converterEvery other ebook pair: FB2, AZW3, CBZ, TXT and more.book.fb2arrow_forwardbook.epubdescriptionWord to PDFWrote the book in Word? Share a PDF proof first.manuscript.docxarrow_forward.pdf
Sources
[1]Send to Kindle supported formatsWhich file types Amazon accepts.Amazon Help ↗[2]Mobipocket formatHistory of MOBI and AZW.Wikipedia ↗[3]EPUB 3.3The current EPUB standard.W3C ↗
Frequently Asked Questions
Is converting EPUB to MOBI free?
Yes, EPUB to MOBI conversion is completely free with no signup, no watermark, and no usage limit. Convert as many files as you need.
Are my files uploaded to a server?
Your EPUB to MOBI file is sent over an encrypted connection to our servers, converted, and returned to you. Files are processed only to perform the conversion and are not stored or retained afterward, so they are removed automatically once your download is ready.
How long does EPUB to MOBI conversion take?
Most EPUB to MOBI conversions finish in under a minute. Larger files take proportionally longer, but everything happens locally so there is no sign-up wait.
Will the conversion reduce file quality?
That comes down to the formats at each end. A lossless conversion changes nothing you can measure. A lossy one shaves the file down and takes a small amount of quality with it.
Does this work on mobile devices?
Yes. The EPUB to MOBI converter works on phones, tablets, and desktops in any modern browser including Chrome, Safari, Firefox, and Edge.