Cut Out and Replace a Background in Three Seconds

Three-second cutouts aren't an exaggeration: one second to back up the background layer, one to select the subject, one to drop in a new background. What's left is edge detail, and this tutorial covers how to finish that too — shortcuts included, along with the traps to avoid.

Back up the background layer (1 second)

Open the image (Ctrl+O) and select the background layer in the Layers panel.
Press Ctrl+J to duplicate it quickly and name the copy "Cutout". This guarantees the original is never damaged — all the work happens on the new layer.
If you're already used to working non-destructively you can skip this, but it's a habit worth keeping.

Select the subject intelligently (1 second)

Choose the Quick Selection tool (shortcut W). It's smarter than the Magic Wand and expands along edges automatically.
Click and drag over the subject and the selection spreads like a ripple. Hold Alt while painting to subtract the excess.
Use the bracket keys [ and ] to change the brush size — big brush for large areas, small brush for fine edges.
Where the subject is close in color to the background, temporarily lower the brush hardness (in the options bar), or fix it afterwards with Select and Mask.

Refine the edge detail (1 second)

Keep the selection and click Select and Mask in the options bar (Refine Edge in older versions) to open the dedicated selection workspace.
On the left, choose the "Refine Edge Brush" (the second icon) and paint along complex edges like hair and tree branches; PS separates foreground from background for you.
In the Global Adjustments on the right, add a little Smooth (removes jaggies), Feather (softens the edge) and Contrast (sharpens it). If there's color spill at the edge, tick "Decontaminate Colors".
For Output, choose "New Layer with Layer Mask" and click OK. The Layers panel now holds a masked cutout layer and the background is gone.

Swap the background in one step (1 second)

Create a layer below the cutout (Ctrl+Shift+N) and fill it with a flat color as needed (Alt+Delete for the foreground color, Ctrl+Delete for the background color), or drag an image in as the new background.
If the new background covers the subject, drag the layers into order so the cutout layer is on top.
Not happy with it? Use the Brush tool (white or black) on the mask to fine-tune: white reveals the subject, black hides the excess.
And that's it — export as PNG to keep transparency, or save as PSD for later.

💡 Advanced tips

Flat backgrounds: just click the background with the Magic Wand and clean the edge with Select and Mask — much faster.
Complex backgrounds: try the Object Selection tool (press W to cycle to it); AI picks out the subject, which works well for animals and people.
Batch work: record the cutout as an Action and run it with one click next time.
Remember to try the different View Modes in Select and Mask (Overlay, Black background and so on) to inspect the edge.
If a white fringe remains, Layer > Matting > Remove White Matte clears it quickly.

📝 Summary and a recommendation

That is the whole "three-second cutout and background swap". The trick is to let PS's intelligent detection do the tedious manual work. Once you're fluent, most images really do take about three seconds.

Of course, if Photoshop isn't installed on your machine, or you just want a lighter online workflow, try www.zaixianps.cc — a free online PS with no download. Open a browser and you get the core PS feature set, including selections, masks and stamps, with PSD compatibility. It's ideal for quick cutouts or emergencies, and paired with this method you can still do the whole job in three seconds.

⚠️ Common problems and fixes

The selection is never accurate: initialise it with the Object Selection tool, then switch to Quick Selection to fine-tune.
Hair won't cut cleanly: in Select and Mask, paint the strands with the Refine Edge Brush and raise Contrast and Shift Edge to pull the selection in slightly.
The edge looks harsh after the swap: feather the mask a little (right-click the mask > Feather), or add Gaussian Blur on the new background layer to simulate depth of field.