Windows capture tool · cgo-free Go · one exe

Turn the page. flip captures it.

Pick a region of your screen. flip sends the page-turn key to the window you chose, waits for the redraw to settle, captures the region, and repeats - then hands you a folder of images or an assembled PDF. No screenshots, no stitching, no clicking through hundreds of pages by hand.

Free for noncommercial use · Windows · single .exe · no runtime, no cgo

Illustrative mock-up - a stylized rendering of the interface, not a screen capture. Sample content is fictional.

Off its own shot
Parks off the region
While capturing, flip shrinks to a small always-on-top readout parked off the region's monitor - so its own window never lands in a page.
No half-drawn pages
Waits for the redraw
A tile fingerprint watches the region until it stops changing, then captures - a page caught mid-render is never saved.
Yours to reproduce
Refuses protected windows
A DRM reader tells Windows not to let its window be captured; it reads as solid black. flip detects that at preflight and stops.
One region, every page

The tedious part of a long document, automated.

Anything you read one page at a time - a scanned book, a slide deck, a viewer with no export - flip walks through and captures, so you end up with the whole thing instead of the tab you had open.

Pick a region

Drag a box over the page. A live difference heatmap shows exactly what is changing, so you keep a blinking caret or a toolbar outside the capture.

Any window, any key

Choose the window to capture and the key that turns its pages - arrow, space, PageDown. flip sends it, focus-checked, and never touches another window.

Waits for the redraw

Between pages flip waits for the region to settle before it captures - the same fingerprint it uses to confirm the page actually advanced.

Split spreads

Cut a two-page spread into single pages, with reading order and a cut offset - the same splitter the CLI uses, now reachable from the GUI.

Clean, then exported

Margin trim, aspect crop and resize, then export a folder of JPG, PNG or BMP - or one assembled PDF, in the order you set.

Compact capture widget

A five-second countdown to click the target, then flip shrinks to a small always-on-top readout and works the pages. Ctrl+Shift+F9 aborts anytime.

Target · Region · Preflight · Run · Results

Set it once, watch it work the pages.

Pick the window and region, run one test capture to check integrity and protection, then hand flip the countdown. It sends the key, waits for the redraw, captures, and moves on - until the page stops changing.

flip - run illustrative
run region 1240×1730 · key PageDown · JPG q92 · split off
preflight one capture · integrity ok · not protected
 
page 1 sent PageDown settled 480ms captured
page 2 sent PageDown settled 512ms captured
page 3 sent PageDown settled 445ms captured
page 312 sent PageDown no change end of document · stop
 
export 312 pages → book.pdf (148 MB) done

Reorder or drop pages on the results screen before you export. Ctrl+Shift+F9 aborts a run at any time; whatever was captured is still yours.

One exe. No installer.

Stop screenshotting page by page.

# 1. grab the Windows build
 github.com/hoijunkim/flip/releases

# 2. right-click the zip → Properties → Unblock, then extract flip.exe
# 3. run it. SmartScreen warns on an unsigned exe: More info → Run anyway.