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OneMark Capture User Guide

OneMark Capture helps you capture or record a screen region, window, or full screen, mark what matters, arrange captures in grids, review MP4 and GIF recordings, summarize or copy recognized text, edit handoff prompt text, then save an editable project or share a flattened image or recording.

Start a markup

  • Start on a clean blank canvas or choose a capture action from the titlebar dropdown.
  • Use File > New OneMark Capture Window or Command-N when you want another blank canvas without replacing the current window.
  • Use Capture Region, Capture Window, or Capture Full Screen from the Capture menu or menu bar.
  • Use the recording commands when you need a short video or GIF instead of a still capture.
  • Paste image data with Command-V when the clipboard contains an image.
  • Open a normal image file or reopen a saved .onemark project from the File menu.
  • Use the Capture Grid controls when you want several related screenshots in one project before marking or exporting.
  • Use Tools > Image / Canvas to rotate or flip an image and its marks together.

Capture

  • Capture Region: drag over the screen area you want to capture.
  • Capture Window: search visible windows and optionally scale output width or height before capture.
  • Capture Full Screen: capture immediately with one display, or pick a display when multiple displays are connected.
  • Region, window, and full-screen capture controls start with the timer off; when enabled, the timer starts at 3 seconds, can be edited, shows a countdown, and remembers the last off/on and seconds choice.
  • OneMark Capture temporarily hides its normal window during region capture to avoid capturing the blank canvas.
  • Capture Window refreshes automatically if the visible-window picker opens empty, and brings the selected window forward when possible.
  • Capture Full Screen opens a display picker with the preferred or main display selected by default.
  • Accepted captures can copy flattened output to the clipboard by default when that preference is enabled.

Recording

  • Record Region, Record Window, and Record Full Screen use the same target choices as screenshot capture.
  • Choose H.264 MP4 video or animated GIF before starting the recording.
  • MP4 recording can include optional system audio and optional microphone audio. Optional microphone audio is available on macOS 15 or later.
  • GIF recording is silent and opens in a frame review flow before export.
  • Pause and Resume work for region, window, and full-screen MP4 or GIF recordings with every supported audio choice. Use the floating recording control or Record menu; Stop remains available while paused.
  • Elapsed time holds while paused. For MP4, Pause closes the current segment, Resume starts the next, and Stop joins the segments into one continuous recording.
  • GIF capture freezes while paused, and paused intervals do not count toward the 30-second active-recording limit.
  • Region recording uses a dimmed outside area and a visible boundary so the recorded rectangle is clear before and during capture.
  • OneMark Capture finalizes recordings more safely when quitting or closing the app during a recording flow.
  • Global Capture Region shortcuts are more reliable for starting the capture flow from outside the app.

Recording review

  • MP4 recordings reopen in the main window with native video and audio review controls.
  • Use File > Review Recording to reopen an existing GIF or MP4 recording.
  • The GIF Review & Editor lets you adjust frame timing, move or reorder frames, duplicate frames, delete frames, insert still frames, and export a looping GIF.
  • Review recording output before sharing it, especially when MP4 audio or GIF timing matters.

Capture Grid

  • Capture Grid layouts run from 1 x 1 through 3 x 3 for comparing related captures in one editable project.
  • New captures, pasted images, Capture History items, and Capture Library items can fill the next open pane automatically.
  • When you need precision, choose the exact pane before inserting content.
  • Swap panes to reorder the story without recapturing or rebuilding the project.
  • Saved .onemark projects preserve grid layout and pane contents.

Capture History

  • Capture History keeps the 12 most recent region, window, full-screen, and pasted images for the running app session.
  • Use Capture > Show/Hide Capture History, the titlebar capture dropdown, menu bar item, or pane Close button to show or hide it.
  • The image currently open on the canvas is highlighted with a checkmark; selecting it again keeps the current image open.
  • Capture History is separate from Recent Projects and is not saved into .onemark project files.

Capture Library

  • Capture Library is a persistent private local library for captures you may want to reuse after the current app session.
  • Library entries can show thumbnails, source, date, image size, optional OCR summary, and optional linked project metadata.
  • Capture Library contents are stored locally in Application Support and are not uploaded by OneMark Capture.
  • Use library items as sources for Capture Grid panes, markup, review, export, or saved projects.

Annotation tools

  • Use arrows, lines, rectangles, ellipses, text, numbered markers, pen, highlighter, blur, redaction, crop, and ellipse crop.
  • Grouped toolbar buttons keep related tools in one slot while preserving direct keyboard shortcuts.
  • Selected marks can move, resize, duplicate, delete, and nudge by 1 pixel or 10 pixels with Shift-arrow.
  • The shared color picker offers red, orange, yellow, green, blue, purple, pink, black, and white.
  • Highlighter strokes use the stroke setting as a base and render wider and translucent.
  • When a mark crosses a canvas edge, OneMark Capture grows the canvas so the full mark remains visible.

Transform image or canvas

  • Use the bottom-bar zoom controls or View menu for Fit, Actual Size (100%), Zoom In, and Zoom Out.
  • Pan zoomed content with visible scroll bars, mouse wheel, trackpad gestures, or right-click drag.
  • Tools > Image / Canvas rotates the loaded image and canvas 90 degrees clockwise with Command-R or counterclockwise with Shift-Command-R.
  • Flip Horizontal and Flip Vertical mirror the image, expanded canvas area, existing marks, and crop region together.
  • Transforms clear saved OCR review state because text recognition depends on the current pixel orientation.

OCR / Smart Redaction

  • Choose Tools > OCR / Smart Redaction or use the bottom-bar text button when an image is loaded.
  • OneMark Capture scans the image locally with Apple Vision and opens Review, Text, and Handoff tabs.
  • The Review tab groups sensitive-text suggestions and shows whether each match came from rules, Smart Review, or both.
  • Visual Privacy adds on-device face candidates to the same review-first workflow before redactions are applied.
  • The top summary shows Apple Intelligence review status, known source context, and counts for rule-only, combined, Smart Review-only, and Visual Privacy candidates.
  • Use Rerun OCR to refresh analysis when the source image changes.
  • Use Summarize Text when Apple Intelligence is available; recognized text remains selectable when it is not.
  • The Handoff tab edits the prompt that becomes prompt.md; on macOS 15 or later, that prompt supports Apple Writing Tools.

Projects

  • Press Command-S to save unsaved editable work.
  • Use Save Project As... to write a new .onemark file.
  • .onemark files are self-contained editable projects that can preserve annotations, Capture Grid layout, pane contents, OCR text, review state, Smart Review details, Visual Privacy review state, Text Summary output, prompt text, and Share Studio composition state.
  • Recent Projects keeps a private local list of saved project files for quick reopening.
  • OneMark Capture asks whether to save dirty editable work before closing, quitting, or opening another file.

Output

  • Copy a default flattened PNG with Command-C when no mark is selected.
  • When enabled, accepted captures copy flattened output to the clipboard automatically after capture.
  • Use Share Flattened Image to open the native macOS share sheet.
  • Export PNG or JPEG with scale and background options.
  • Save H.264 MP4 recordings or export reviewed animated GIF recordings from the recording review flow.
  • Drag from the bottom bar to create a temporary flattened output file.
  • Create AI Handoff bundles from the OCR review flow when you want a local redacted image, recognized text, context files, and prompt.md.
  • Very large scaled exports can be rejected before output is allocated; lower the export scale or crop first.

Share Studio

  • Choose Share > Open Share Studio... to compose the current flattened image as a Product Launch share image.
  • Use App Store compositions for iPhone, iPad, and Mac with accepted-size presets.
  • Adaptive Brand & Copy helps fit title, subtitle, and caption text across light and dark themes.
  • App Store composition export writes opaque PNG output with no alpha channel.
  • Set aspect ratio, exact output width and height in pixels, inches, centimeters, or millimeters, stage variant, frame, caption, saved logo, and output format.
  • Save named app-level presets for repeatable output settings.
  • Saved logo storage is bounded, and project files can preserve the concrete Share Studio composition and selected logo choices.
  • Share Studio includes the Neural Horizon AI stage theme.

Shortcuts and Siri

  • OneMark Capture exposes foreground actions for Capture Region, Run OCR / Smart Redaction, Copy Recognized Text, AI Handoff, Export Redacted Image, and project bookmark workflows.
  • These actions open OneMark Capture in the foreground and use the same editor workflow as toolbar and menu commands.
  • App-local shortcuts include Shift-Command-2, Shift-Command-W, and Shift-Command-F.

Privacy and limits

  • OCR accuracy depends on the source image; Visual Privacy face candidates are on-device review suggestions, not automatic sharing decisions.
  • Text Summary and Smart Review use Apple Intelligence/Foundation Models only when available on the Mac, with local rule-based fallback for sensitive text.
  • Screen recordings, microphone or system audio, and temporary GIF frames stay on your Mac unless you choose to save, export, share, or upload them elsewhere.
  • Microphone audio is recorded only when you enable it for an MP4 recording.
  • OneMark Capture does not upload screenshots, recordings, recognized text, redacted exports, AI Handoff bundles, projects, grid pane contents, Capture Library contents, or audio files to third-party AI services.
  • AI Handoff bundles are local and inspectable; review recognized-text.txt and prompt.md before uploading them elsewhere.
  • Capture History is session-local; Capture Library is persistent, private, and local to your Mac.