Specify the input profile. The input profile gives the conversion system information on how to interpret various information in the input document. For example resolution dependent lengths i. List builtin recipe names. You can create an e-book from a builtin recipe like this: ebook-convert " Recipe Name. Specify the output profile. The output profile tells the conversion system how to optimize the created document for the specified device such as by resizing images for the device screen size.
In some cases, an output profile can be used to optimize the output for a particular device, but this is rarely necessary. Also, note that in cases where there are multiple representations of a character characters shared by Chinese and Japanese for instance the representation based on the current calibre interface language will be used. The base font size in pts. All font sizes in the produced book will be rescaled based on this size. By choosing a larger size you can make the fonts in the output bigger and vice versa.
By default, when the value is zero, the base font size is chosen based on the output profile you chose. Change text justification. A value of " left " converts all justified text in the source to left aligned i.
A value of " justify " converts all unjustified text to justified. A value of " original " the default does not change justification in the source file.
Note that only some output formats support justification. Embed every font that is referenced in the input document but not already embedded. This will search your system for the fonts, and if found, they will be embedded. Please ensure that you have the proper license for embedding the fonts used in this document. Embed the specified font family into the book. This specifies the " base " font used for the book.
If the input document specifies its own fonts, they may override this base font. You can use the filter style information option to remove fonts from the input document. By default, calibre will use the shorthand form for various CSS properties such as margin, padding, border, etc. This option will cause it to use the full expanded form instead. This CSS will be appended to the style rules from the source file, so it can be used to override those rules.
This is useful if the presence of some style information prevents it from being overridden on your device. For example: font-family,color,margin-left,margin-right. Mapping from CSS font names to font sizes in pts. An example setting is 12,12,14,16,18,20,22, These are the mappings for the sizes xx-small to xx-large, with the final size being for huge fonts. The font rescaling algorithm uses these sizes to intelligently rescale fonts. The default is to use a mapping based on the output profile you chose.
Insert a blank line between paragraphs. Set the height of the inserted blank lines in em. The height of the lines between paragraphs will be twice the value set here.
Preserve ligatures present in the input document. A ligature is a special rendering of a pair of characters like ff, fi, fl et cetera. Most readers do not have support for ligatures in their default fonts, so they are unlikely to render correctly. By default, calibre will turn a ligature into the corresponding pair of normal characters. This option will preserve them instead. The line height in pts.
Controls spacing between consecutive lines of text. Only applies to elements that do not define their own line height. In most cases, the minimum line height option is more useful. By default no line height manipulation is performed.
Some badly designed documents use tables to control the layout of text on the page. When converted these documents often have text that runs off the page and other artifacts. This option will extract the content from the tables and present it in a linear fashion. Set the bottom margin in pts. Default is 5. Setting this to less than zero will cause no margin to be set the margin setting in the original document will be preserved.
Set the left margin in pts. Set the right margin in pts. Set the top margin in pts. The minimum line height, as a percentage of the element ' s calculated font size. Set to zero to disable. Use this setting in preference to the direct line height specification, unless you know what you are doing. For example, you can achieve " double spaced " text by setting this to Remove spacing between paragraphs. Also sets an indent on paragraphs of 1. When calibre removes blank lines between paragraphs, it automatically sets a paragraph indent, to ensure that paragraphs can be easily distinguished.
This option controls the width of that indent in em. If you set this value negative, then the indent specified in the input document is used, that is, calibre does not change the indentation. Convert plain quotes, dashes and ellipsis to their typographically correct equivalents. Subset all embedded fonts.
Every embedded font is reduced to contain only the glyphs used in this document. This decreases the size of the font files. Useful if you are embedding a particularly large font with lots of unused glyphs. Path to a file containing rules to transform the CSS styles in this book. The easiest way to create such a file is to use the wizard for creating rules in the calibre GUI.
Once you create the rules, you can use the " Export " button to save them to a file. Path to a file containing rules to transform the HTML in this book. Modify the document text and structure using common patterns. Disabled by default. Use —enable-heuristics to enable. Analyze hyphenated words throughout the document. The document itself is used as a dictionary to determine whether hyphens should be retained or removed.
Left aligned scene break markers are center aligned. Replace soft scene breaks that use multiple blank lines with horizontal rules. Detect unformatted chapter headings and sub headings. Change them to h2 and h3 tags. This setting will not create a TOC, but can be used in conjunction with structure detection to create one.
The tags are renumbered to prevent splitting in the middle of chapter headings. Scale used to determine the length at which a line should be unwrapped.
Valid values are a decimal between 0 and 1. The default is 0. If only a few lines in the document require unwrapping this value should be reduced. Replace scene breaks with the specified text.
By default, the text from the input document is used. Path to a file containing search and replace regular expressions. The file must contain alternating lines of regular expression followed by replacement pattern which can be an empty line.
The regular expression must be in the Python regex syntax and the file must be UTF-8 encoded. An XPath expression to detect chapter titles. The expression used must evaluate to a list of elements. Specify how to mark detected chapters. A value of " pagebreak " will insert page breaks before chapters. A value of " rule " will insert a line before chapters. A value of " none " will disable chapter marking and a value of " both " will use both page breaks and lines to mark chapters.
Some documents specify page margins by specifying a left and right margin on each individual paragraph. Sometimes, this can cause the removal of margins that should not have been removed. In this case you can disable the removal. Insert the book metadata at the start of the book. An XPath expression. Page breaks are inserted before the specified elements. Remove the first image from the input e-book.
Useful if the input document has a cover image that is not identified as a cover. In this case, if you set a cover in calibre, the output document will end up with two cover images if you do not specify this option. An XPath expression to detect the location in the document at which to start reading. Some e-book reading programs most prominently the Kindle use this location as the position at which to open the book. See the XPath tutorial in the calibre User Manual for further help using this feature.
Control the automatic generation of a Table of Contents. By default, if the source file has a Table of Contents, it will be used in preference to the automatically generated one. When creating a TOC from links in the input document, allow duplicate entries, i. XPath expression that specifies all tags that should be added to the Table of Contents at level one.
If this is specified, it takes precedence over other forms of auto-detection. XPath expression that specifies all tags that should be added to the Table of Contents at level two. Each entry is added under the previous level one entry. XPath expression that specifies all tags that should be added to the Table of Contents at level three. Each entry is added under the previous level two entry.
Maximum number of links to insert into the TOC. Set to 0 to disable. Default is: Links are only added to the TOC if less than the threshold number of chapters were detected. Don ' t add auto-detected chapters to the Table of Contents. Remove entries from the Table of Contents whose titles match the specified regular expression.
Matching entries and all their children are removed. If fewer than this number of chapters is detected, then links are added to the Table of Contents. Default: 6. Normally, if the source file already has a Table of Contents, it is used in preference to the auto-generated one. With this option, the auto-generated one is always used. Set the publication date assumed to be in the local timezone, unless the timezone is explicitly specified. Read metadata from the specified OPF file. Metadata read from this file will override any metadata in the source file.
Save the output from different stages of the conversion pipeline to the specified folder. Useful if you are unsure at which stage of the conversion process a bug is occurring.
Level of verbosity. Specify multiple times for greater verbosity. Specifying it twice will result in full verbosity, once medium verbosity and zero times least verbosity. Specify the character encoding of the input document. If set this option will override any encoding declared by the document itself. Particularly useful for documents that do not declare an encoding or that have erroneous encoding declarations.
Reduce the number of colors used in the image. This works only if you choose the PNG output format. It is useful to reduce file sizes. Set to zero to turn off. Maximum value is It is off by default.
Specify the image size as width x height pixels, for example: x Normally, an image size is automatically calculated from the output profile, this option overrides it. Disable trimming of comic pages. For some comics, trimming might remove content as well as borders. Note this only applies if the TOC has more than one section. Don ' t split landscape images into two portrait images.
Don ' t sort the files found in the comic alphabetically by name. Instead use the order they were added to the comic. The format that images in the created e-book are converted to. You can experiment to see which format gives you optimal size and look on your device. Used for right-to-left publications like manga.
Causes landscape pages to be split into portrait pages from right to left. Keep aspect ratio and scale image using screen height as image width for viewing in landscape mode. Normally, if a large image is present at the start of the document that looks like a cover, it will be removed from the document and used as the cover for created e-book.
Pressing the spacebar , page up , page down or arrow keys. Pressing the Esc or Menu keys. In paged mode the book content is presented as pages, similar to a paper book. In flow mode the text is presented continuously, like in a web browser. When you are in the middle of a book and close the E-book viewer, it will remember where you stopped reading and return there the next time you open the book.
You can add bookmarks, then send the file to a friend. When they open the file, they will be able to see your bookmarks. You can turn off this behavior in the Miscellaneous section of the viewer preferences. If the book you are reading defines a Table of Contents, you can access it by pressing the Table of Contents button.
This will bring up a list of sections in the book. You can click on any of them to jump to that portion of the book. E-books, unlike paper books, have no concept of pages. You can use this location information to unambiguously refer to parts of the books when discussing it with friends or referring to it in other works.
There is a URL you can copy to the clipboard and paste into other programs or documents. Clicking on this URL will open the book in the calibre E-book viewer at the current location.
If you click on links inside the e-book to take you to different parts of the book, such as an endnote, you can use the Back and Forward buttons in the top left corner of the viewer controls. These buttons behave just like those in a web browser. You can turn it on by clicking the Reference mode button in the viewer controls.
Once you do this, every paragraph will have a unique number displayed at the start, made up of the section and paragraph numbers. You can use this number to unambiguously refer to parts of the books when discussing it with friends or referring to it in other works.
You can enter these numbers in the Go to function to navigate to a particular reference location. When you select text in the viewer, a little popup bar appears next to the selection. You can click the highlight button in that bar to create a highlight. You can add notes and change the color of the highlight.
On a touch screen, long tap a word to select it and show the popup bar. Once in highlight mode you can change what text is selected, using touch screen friendly selection handles. Drag the handles to the top or bottom margins to scroll while selecting. You can use the Highlights button in the viewer controls to show a separate panel with a list of all highlights in the book, sorted by chapter. You can browse all highlights in your entire calibre library by right clicking the View button and choosing Browse annotations.
The viewer can read book text aloud. To use it you can simply click the Read aloud button in the viewer controls to start reading book text aloud. The word being currently read is highlighted. Speech is synthesized from the text using your operating system services for text-to-speech. You can change the voice being used by clicking the gear icon in the bar that is displayed while Read aloud is active.
You can also read aloud highlighted passages by adding the Read aloud button to the selection bar in the viewer preferences under Selection behavior.
Support for text-to-speech in browsers is very incomplete and bug-ridden so how well Read aloud will work in the in-browser viewer is dependent on how well the underlying browser supports text-to-speech.
In particular, highlighting of current word does not work, and changing speed or voice will cause reading to start again from the beginning. On Linux, Read aloud requires Speech Dispatcher to be installed and working. On Windows, not all installed voices may be visible to the SAPI sub-system that is used for text-to-speech. There are instructions to make all voices visible.
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