What file formats does FenSight support?

FenSight supports PNG, JPG/JPEG, BMP, GIF, TIFF, TGA, WEBP, JPEG-XL, AVIF, HEIF/HEIC, DICOM, and most RAW formats (DNG, CR2, CR3, NEF, ARW, RAF, and more). It also supports video files and image sequences.

Does FenSight require an internet connection?

FenSight is built for offline use after activation. License keys validate locally, and the app may periodically check license status for refund or revocation handling. Optional AI features can run locally where supported or use providers you configure.

Is FenSight a subscription or one-time purchase?

FenSight is a one-time purchase with no recurring subscriptions. You buy it once and own it forever. Free updates are included, and you can use it offline indefinitely.

Can I use FenSight with Photoshop or other creative tools?

Yes. FenSight supports external drag-out, meaning you can drag selections directly from the canvas into Photoshop, Illustrator, Figma, or any application that accepts file drops. You can also export to clipboard, file, or FTP/FTPS.

What are the system requirements for FenSight?

FenSight requires Windows 10 64-bit (build 19044+) or Windows 11. The .NET 9.x runtime is bundled. Minimum: 8 GB RAM and DirectX 11 GPU. Recommended: 16 GB RAM with a dedicated GPU for large boards and AI features.

Canvas and boards/08

Labels, shapes, and connectors

Free

Annotate boards without leaving FenSight.

Labels, shapes, and connectors are Free board annotations. They are saved inside .fns board files, stay separate from source media, and can be selected, moved, styled, locked, layered, copied, pasted, grouped, and restored with the board.

Screenshot coming soon

FenSight board showing labels, shape tools, connector anchors, and the annotation quick action bar

Screenshot placeholder. Expected production asset: /docs/screenshots/labels-shapes-and-connectors.png.

Annotation access paths

Toolbar

Bottom tool rail -> Label (L)

Toggles add-label mode. The next canvas click creates a user label and starts inline editing.

Toolbar

Bottom tool rail -> Text Box (T) / Comment (C)

Creates text-backed board labels with Text or Comment defaults. One-click placement creates a 220 x 90 item.

Toolbar

Bottom tool rail -> Square / Rectangle (R), Circle / Ellipse (O), Diamond (D), Trapezoid

Creates text-capable shape items. Drag or click twice to size the shape.

Toolbar

Bottom tool rail -> Marquee

Creates a frame shape. This is different from the empty-canvas marquee selection gesture.

Toolbar

Bottom tool rail -> Divider

Creates a connector. Connector anchors appear on a single selected shape or label.

Toolbar

Selection quick action bar -> Fill / Stroke / Text / Cycle connector style

Appears near the current selection when the selected object supports the action.

View -> Labels & Text

Shows or hides label and text rendering on the board surface.

Toolbar

Settings -> Appearance -> Labels -> Cluster label size / Text color / Background color / Pick

Sets default label colors and cluster-label sizing. Per-label H1-H4 sizing is changed from the board quick text popover.

Context menu

Label item -> Edit text...

Starts inline label editing for the selected label.

Context menu

Shape item -> Properties... / Delete / Bring Forward / Send Backward / Bring to Front / Send to Back / Lock selected / Unlock selected

Selects the shape, exposes style controls, deletes the item, or changes z-order and lock state.

Creation tools

Tool label	User-facing behavior	Technical behavior
Label (L)Free	Places a free-floating board label.	Add-label mode creates a LabelItem at the clicked canvas point, applies the current label foreground/background settings, centers the measured label above the click, and starts inline editing.
Text Box (T)Free	Places a rectangular text note.	One-click placement creates a 220 x 90 LabelItem with Text as its initial text and a dark translucent background, selects it, and starts inline editing.
Comment (C)Free	Places a comment note.	One-click placement creates a 220 x 90 LabelItem with Comment as its initial text and a warm translucent background, selects it, and starts inline editing.
Square / Rectangle (R)Free	Creates a rounded rectangle shape that can contain text.	The shape uses the current stroke, fill, stroke style, stroke width, corner radius, and dot spacing controls. Shape text editing starts after creation.
Circle / Ellipse (O)Free	Creates an ellipse shape that can contain text.	By default, shape creation keeps width and height uniform. Holding Ctrl while sizing allows non-uniform sizing.
Diamond (D)Free	Creates a diamond shape that can contain text.	Diamond shape geometry is rendered from the saved shape bounds and uses the same text and style pipeline as other text-capable shapes.
TrapezoidFree	Creates a trapezoid shape that can contain text.	Trapezoid has no bare-key shortcut because F is reserved for fit-to-view.
MarqueeFree	Creates a frame around a board area.	The Frame tool creates a transparent ShapeItem. If the current stroke style is Solid or empty, FenSight saves the frame stroke style as Dash.
DividerFree	Creates a connector between two points or anchors.	The connector tool creates a ShapeItem with Shape set to Connector, transparent fill, current stroke settings, and Elbow as the initial connector style.

Text and label editing

Control	User-facing behavior	Technical behavior
Inline label editFree	Edits label text directly on the board.	Enter commits, Shift + Enter inserts a newline, Escape cancels, and losing keyboard focus commits the current text. The edit box auto-resizes while you type.
Edit text...Free	Starts editing a label from the context menu.	The label context menu calls the same inline editor used immediately after label creation.
H1 / H2 / H3 / H4Free	Changes selected user-label size from the quick text popover.	User labels store a HeadingLevel. Cluster labels are excluded from this per-label size control and use the cluster label size setting instead.
Shape SizeFree	Changes text size inside selected text-capable shapes.	The quick text popover exposes a 6 to 120 slider and a numeric input. Shape text defaults to 24.
FontFree	Changes the selected label or shape text font.	The quick text popover lists system font family names and stores the selected FontFamilyName on the label or shape.
Align left / Align center / Align rightFree	Changes selected text alignment.	Alignment is saved as TextAlign for labels and shape text, then applied when the board surface redraws.
Text colorFree	Changes selected label text or shape text color.	The quick text popover applies swatch colors to selected labels and text-capable shapes. User labels mark HasCustomColors when customized.
Labels & TextFree	Shows or hides board text annotations.	The View menu and label toggle update BoardViewState.LabelsVisible, then force the board surface to redraw.

Shape style controls

Control	User-facing behavior	Technical behavior
StrokeFree	Changes the outline thickness.	The ShapeStrokeWidthSlider runs from 0 to 50 and writes StrokeThickness to selected shapes.
Stroke color / PickFree	Changes the outline color.	The stroke color field accepts a color string and the Pick button opens the color picker. Selected shapes and connectors receive the brush.
Solid / Dash / DotFree	Changes the outline pattern.	The active stroke-style dropdown stores StrokeStyle as Solid, Dash, or Dot. Dot spacing is controlled separately.
FillFree	Changes shape or label fill color from preset or custom values.	The fill dropdown exposes None, Accent, Warm, Cool, and Neutral. The adjacent fill color field accepts a custom color. Frame shapes are forced to transparent fill.
Corner radiusFree	Rounds eligible shape corners.	The corner radius slider runs from 0 to 300 and applies to Rectangle, Frame, Diamond, and Trapezoid shapes.
Dot spacingFree	Adjusts dotted stroke spacing.	The dot spacing slider runs from 0.5 to 20 and updates StrokeDotSpacing.
Resize handlesFree	Resizes a selected shape.	Handles appear for one selected, unlocked, non-connector shape. Corner resizing preserves aspect ratio by default; holding Ctrl allows free non-uniform resizing.
Lock selected / Unlock selectedFree	Prevents or restores movement and resizing.	Locked annotation items are skipped by move, nudge, and resize operations and the lock state is saved with the board.
Bring Forward / Send Backward / Bring to Front / Send to BackFree	Changes stacking order.	Z-order changes are saved with board items. Default rendering places shapes behind file items, connectors above file items, and labels above connectors.

Connector behavior

Behavior	User-facing behavior	Technical behavior
Straight / Elbow / CurveFree	Changes the connector path style from the dropdown.	ConnectorStyleCombo exposes Straight, Elbow, and Curve. Connector creation starts with Elbow.
Cycle connector styleFree	Cycles selected connectors through available styles.	The quick action cycles Straight -> Elbow -> Curve -> Line. Line is a supported saved/rendered connector style even though the dropdown lists the first three styles.
Anchor dotsFree	Connects a line to the top, right, bottom, or left side of a shape or label.	A single selected non-connector shape or label exposes anchors. Hovering near a shape or label can also reveal anchors for connector preview.
Anchor snappingFree	Snaps connector endpoints to nearby anchors.	Connector preview and endpoint dragging snap within a 28-screen-pixel radius. Anchor hover activation uses a 50-screen-pixel radius.
Shift while placing a connectorFree	Constrains the connector angle.	Shift runs the endpoint through SnapLineAngle before the preview or final connector is updated.
Move or resize anchored itemsFree	Keeps attached connectors connected.	Moving or resizing an anchored shape or label refreshes connectors whose start or end anchor references that item.
Drag connector endpointsFree	Moves or re-anchors a connector endpoint.	Dragging an endpoint clears its current anchor until it snaps to a new eligible anchor. Internal connector points move freely.
Double-click connector bodyFree	Adds a bend/control point.	FenSight inserts a ConnectorPoints entry at the nearest projected segment point. When connector points exist, they override the generated Straight, Elbow, or Curve geometry.

Saved board data

Annotations are board data, not edits to the original media files.

Item type	What is preserved	Technical fields
LabelsFree	Restores text notes, headings, alignment, font, and custom colors.	Board saves LabelText, LabelHeadingLevel, LabelFontFamily, LabelTextAlign, LabelVerticalAlign, LabelTextColor, and LabelBackgroundColor where applicable.
ShapesFree	Restores shape kind, size, position, text, fill, stroke, style, and lock state.	Board saves ShapeKind, ShapeWidth, ShapeHeight, ShapeStroke, ShapeFill, ShapeStrokeThickness, ShapeCornerRadius, ShapeStrokeStyle, ShapeDotSpacing, ShapeText, and related fields.
ConnectorsFree	Restores connector style, endpoints, custom control points, and anchor attachments.	Board saves ShapeConnectorStyle, connector start/end coordinates, ConnectorPoints, ConnectorStartItem/Side, and ConnectorEndItem/Side.
Groups and z-orderFree	Keeps annotations grouped and layered with other board items.	Annotations save ItemId, GroupId, IsLocked, z-order, and normal board position fields.

The toolbar Marquee tool creates a frame annotation. Empty-canvas drag is the selection marquee described in Selection and navigation.

Annotations are non-destructive board objects. Deleting a label, shape, connector, or frame removes it from the board, not from source media on disk.

Connected guides

Follow these related pages when the workflow crosses into setup, search, organization, export, security, or another board-level system.

Selection and navigationWork quickly on dense boards.Board filesSave and reopen full visual workspaces.Settings and backupsKeep preferences portable and recoverable.Cluster Labels and BackgroundsReadable group headers and frame shapes.Export optionsCopy, save, upload, and deliver selections.Importing media and foldersBring files, folders, and large libraries onto the canvas.

Linked from

Selection and navigation Metadata overlays