## Customizing SumatraPDF

You can change the look and behavior of SumatraPDF by editing the file `SumatraPDF-settings.txt`. The file is stored in `%APPDATA%\SumatraPDF` directory for the installed version or in the same directory as `SumatraPDF.exe` executable for the portable version.

Use the menu item `Settings -> Advanced Settings...` to open the settings file with your default text editor.

The file is in a simple text format. Below is an explanation of what the different settings mean and what their default values are.

Highlighted settings can't be changed from the UI. Modifying other settings directly in this file is not recommended.

If you add or remove lines with square brackets, make sure to always add/remove square brackets in pairs! Else you risk losing all the data following them.

    background color of the non-document windows, traditionally yellow
    MainWindowBackground = #fff200

    if true, Esc key closes SumatraPDF
    EscToExit = false

    if true, we'll always open files using existing SumatraPDF process
    ReuseInstance = false

    customization options for PDF, XPS, DjVu and PostScript UI
    FixedPageUI [
        color value with which black (text) will be substituted
        TextColor = #000000

        color value with which white (background) will be substituted
        BackgroundColor = #ffffff

        color value for the text selection rectangle (also used to highlight found text) (introduced in
        version 2.4)
        SelectionColor = #f5fc0c

        top, right, bottom and left margin (in that order) between window and document
        WindowMargin = 2 4 2 4

        horizontal and vertical distance between two pages in facing and book view modes
        PageSpacing = 4 4

        colors to use for the gradient from top to bottom (stops will be inserted at regular intervals
        throughout the document); currently only up to three colors are supported; the idea behind this
        experimental feature is that the background might allow to subconsciously determine reading
        progress; suggested values: #2828aa #28aa28 #aa2828
        GradientColors =
    ]

    customization options for eBooks (EPUB, Mobi, FictionBook) UI. If UseFixedPageUI is true,
    FixedPageUI settings apply instead
    EbookUI [
        name of the font. takes effect after re-opening the document
        FontName = Georgia

        size of the font. takes effect after re-opening the document
        FontSize = 12.5

        color for text
        TextColor = #5f4b32

        color of the background (page)
        BackgroundColor = #fbf0d9

        if true, the UI used for PDF documents will be used for ebooks as well (enables printing and
        searching, disables automatic reflow)
        UseFixedPageUI = false
    ]

    customization options for Comic Book and images UI
    ComicBookUI [
        top, right, bottom and left margin (in that order) between window and document
        WindowMargin = 0 0 0 0

        horizontal and vertical distance between two pages in facing and book view modes
        PageSpacing = 4 4

        if true, default to displaying Comic Book files in manga mode (from right to left if showing 2
        pages at a time)
        CbxMangaMode = false
    ]

    customization options for CHM UI. If UseFixedPageUI is true, FixedPageUI settings apply instead
    ChmUI [
        if true, the UI used for PDF documents will be used for CHM documents as well
        UseFixedPageUI = false
    ]

    list of additional external viewers for various file types (can have multiple entries for the same
    format)
    ExternalViewers [
      [
        command line with which to call the external viewer, may contain %p for page numer and %1 for
        the file name
        CommandLine =

        name of the external viewer to be shown in the menu (implied by CommandLine if missing)
        Name =

        filter for which file types the menu item is to be shown (e.g. "*.pdf;*.xps"; "*" if missing)
        Filter =
      ]
    ]

    if false, the menu bar will be hidden for all newly opened windows (use F9 to show it until the
    window closes or Alt to show it just briefly) (introduced in version 2.5)
    ShowMenubar = true

    sequence of zoom levels when zooming in/out; all values must lie between 8.33 and 6400
    ZoomLevels = 8.33 12.5 18 25 33.33 50 66.67 75 100 125 150 200 300 400 600 800 1000 1200 1600 2000 2400 3200 4800 6400

    zoom step size in percents relative to the current zoom level. if zero or negative, the values from
    ZoomLevels are used instead
    ZoomIncrement = 0

    these override the default settings in the Print dialog
    PrinterDefaults [
        default value for scaling (shrink, fit, none)
        PrintScale = shrink

        default value for the compatibility option
        PrintAsImage = false
    ]

    customization options for how we show forward search results (used from LaTeX editors)
    ForwardSearch [
        when set to a positive value, the forward search highlight style will be changed to a rectangle
        at the left of the page (with the indicated amount of margin from the page margin)
        HighlightOffset = 0

        width of the highlight rectangle (if HighlightOffset is > 0)
        HighlightWidth = 15

        color used for the forward search highlight
        HighlightColor = #6581ff

        if true, highlight remains visible until the next mouse click (instead of fading away
        immediately)
        HighlightPermanent = false
    ]

    a whitespace separated list of passwords to try for opening a password protected document (passwords
    containing spaces must be quoted same as command line arguments) (introduced in version 2.4)
    DefaultPasswords =

    if true, a document will be reloaded automatically whenever it's changed (currently doesn't work for
    documents shown in the ebook UI) (introduced in version 2.5)
    ReloadModifiedDocuments = true

    actual resolution of the main screen in DPI (if this value isn't positive, the system's UI setting
    is used) (introduced in version 2.5)
    CustomScreenDPI = 0

    default values for user added annotations in FixedPageUI documents (preliminary and still subject to
    change)
    AnnotationDefaults [
        color used for the highlight tool (in prerelease builds, the current selection can be converted
        into a highlight annotation by pressing the 'h' key)
        HighlightColor = #ffff60

        if true, annotations are appended to PDF documents, else they're always saved to an external
        .smx file
        SaveIntoDocument = true
    ]

    if true, we store display settings for each document separately (i.e. everything after
    UseDefaultState in FileStates)
    RememberStatePerDocument = true

    ISO code of the current UI language
    UiLanguage =

    if true, we show the toolbar at the top of the window
    ShowToolbar = true

    if true, we show the Favorites sidebar
    ShowFavorites = false

    a list of extensions that SumatraPDF has associated itself with and will reassociate if a different
    application takes over (e.g. ".pdf .xps .epub")
    AssociatedExtensions =

    whether file associations should be fixed silently or only after user feedback
    AssociateSilently = false

    if true, we check once a day if an update is available
    CheckForUpdates = true

    we won't ask again to update to this version
    VersionToSkip =

    if true, we remember which files we opened and their display settings
    RememberOpenedFiles = true

    if true, we use Windows system colors for background/text color. Over-rides other settings
    UseSysColors = false

    pattern used to launch the LaTeX editor when doing inverse search
    InverseSearchCmdLine =

    if true, we expose the SyncTeX inverse search command line in Settings -> Options
    EnableTeXEnhancements = false

    default layout of pages. valid values: automatic, single page, facing, book view, continuous,
    continuous facing, continuous book view
    DefaultDisplayMode = automatic

    default zoom (in %) or one of those values: fit page, fit width, fit content
    DefaultZoom = fit page

    default state of the window. 1 is normal, 2 is maximized, 3 is fullscreen, 4 is minimized
    WindowState = 1

    default position (x, y) and size (width, height) of the window
    WindowPos = 0 0 0 0

    if true, we show table of contents (Bookmarks) sidebar if it's present in the document
    ShowToc = true

    width of favorites/bookmarks sidebar (if shown)
    SidebarDx = 0

    if both favorites and bookmarks parts of sidebar are visible, this is the height of bookmarks (table
    of contents) part
    TocDy = 0

    if true, we show a list of frequently read documents when no document is loaded
    ShowStartPage = true

    information about opened files (in most recently used order)
    FileStates [
      [
        path of the document
        FilePath =

        Values which are persisted for bookmarks/favorites
        Favorites [
          [
            name of this favorite as shown in the menu
            Name =

            number of the bookmarked page
            PageNo = 0

            label for this page (only present if logical and physical page numbers are not the same)
            PageLabel =
          ]
        ]

        a document can be "pinned" to the Frequently Read list so that it isn't displaced by recently
        opened documents
        IsPinned = false

        if true, the file is considered missing and won't be shown in any list
        IsMissing = false

        number of times this document has been opened recently
        OpenCount = 0

        data required to open a password protected document without having to ask for the password again
        DecryptionKey =

        if true, we use global defaults when opening this file (instead of the values below)
        UseDefaultState = false

        layout of pages. valid values: automatic, single page, facing, book view, continuous, continuous
        facing, continuous book view
        DisplayMode = automatic

        how far this document has been scrolled (in x and y direction)
        ScrollPos = 0 0

        number of the last read page
        PageNo = 1

        zoom (in %) or one of those values: fit page, fit width, fit content
        Zoom = fit page

        how far pages have been rotated as a multiple of 90 degrees
        Rotation = 0

        state of the window. 1 is normal, 2 is maximized, 3 is fullscreen, 4 is minimized
        WindowState = 0

        default position (can be on any monitor)
        WindowPos = 0 0 0 0

        if true, we show table of contents (Bookmarks) sidebar if it's present in the document
        ShowToc = true

        width of the left sidebar panel containing the table of contents
        SidebarDx = 0

        if true, the document is displayed right-to-left in facing and book view modes (only used for
        comic book documents)
        DisplayR2L = false

        data required to restore the last read page in the ebook UI
        ReparseIdx = 0

        data required to determine which parts of the table of contents have been expanded
        TocState =
      ]
    ]

    data required to determine when SumatraPDF last checked for updates
    TimeOfLastUpdateCheck = 0 0

    value required to determine recency for the OpenCount value in FileStates
    OpenCountWeek = 0

### Syntax for color values

The syntax for colors is: `#rrggbb`.

The components are hex values (ranging from 00 to FF) and stand for:

- `rr` : red component
- `gg` : green component
- `bb` : blue component

For example #ff0000 means red color. You can use Color Picker or Sphere or ColorScheme Designer to pick a color.