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when i click on the healing brush tool in photoshop it does this weird zig zag lasso thing and the brush goes all over the place what did i hit that's making that happen

What’s likely happening

That “weird zig‑zag lasso” behavior when you click the Healing Brush usually means Photoshop thinks you’re making a selection or sampling in a constrained/odd way, not that the tool itself is broken. In most cases it’s caused by one of these:

  • A hidden/active selection (marching ants you can’t see well)
  • Wrong Sample setting on a blank layer
  • Accidental key combo changing tool mode (e.g., Spot Healing vs Healing Brush, or a weird blend mode)
  • Graphics tablet/driver glitch making the cursor jump

Below is how to narrow it down and fix it.

Quick fixes to try first

1. Clear any hidden selection

This is the #1 cause of “the brush goes all over the place” or acting like a lasso.

  • Press Ctrl+D (Windows) or Cmd+D (Mac) to deselect everything.
  • Or go to Select → Deselect.
  • Then try the Healing Brush again.

If that alone stops the zig‑zag, you had an invisible selection active.

2. Check which healing tool you’re actually on

Photoshop has two very similar tools:

  • Spot Healing Brush (no need to set a source; just click/drag)
  • Healing Brush (you must Alt/Option‑click to set a source first)

If you’re on the Healing Brush and haven’t set a source, it can look like it’s “guessing” and behaving erratically.

  • Look at the toolbar:
    • Icon with a bandage and a small circle = Spot Healing Brush
    • Icon with a bandage and a tiny crosshair = Healing Brush
  • If you accidentally switched, click and hold the healing tool icon and choose the one you expect.

3. Fix the “Sample” setting if you’re on a blank layer

If you like non‑destructive editing (healing on a new empty layer above the photo), the Sample dropdown in the options bar is critical. With the Healing Brush selected, check the top options bar:

  • Sample: should be set to “Current & Below” or “All Layers” if you’re painting on a blank layer above your image.
  • If it’s set to “Current Layer” while you’re on an empty layer, the tool has nothing to sample from and can behave strangely.

Steps:

  1. Create a new blank layer above your photo.
  2. Select the Healing Brush.
  3. In the options bar, set Sample → Current & Below (or All Layers).
  4. Alt/Option‑click a clean area to set the source, then paint.

4. Reset the tool and check mode/hardness

Sometimes a stray setting (blend mode, hardness, spacing) makes the brush act odd. In the options bar with the Healing Brush selected:

  • Set Mode → Normal (not Lighten, Multiply, etc.).
  • Set a reasonable Hardness (e.g., 50–70%) for smoother blending.
  • Click the tool icon on the far left of the options bar, then choose “Reset Tool” (or “Reset All Tools” if needed).

If it still jerks or zig‑zags

5. Check for graphics tablet / mouse issues

If you use a Wacom or similar tablet:

  • Update the tablet driver to the latest version.
  • Try the same action with a mouse instead of the pen. If it’s fine with a mouse, it’s likely a tablet/driver issue.

Some users report healing tools feeling “jerky” only when certain driver settings or Windows Ink options are enabled; updating or reinstalling the driver often fixes it.

6. Reset Photoshop preferences (last resort)

If this started “overnight” with no changes and none of the above helps, corrupted prefs can cause tool glitches. To reset preferences:

  • Hold Ctrl+Alt+Shift (Windows) or Cmd+Option+Shift (Mac) immediately after launching Photoshop.
  • When prompted, confirm you want to delete the settings file.
  • Photoshop will start with default preferences. Test the Healing Brush again.

Note: This resets all Photoshop preferences, not just the brush.

Most likely culprit in your case

Given your description—“weird zig zag lasso thing” and “brush goes all over the place” right after clicking—the highest‑probability causes are:

  1. An active (but hard‑to‑see) selection → fix with Ctrl/Cmd+D.
  1. Wrong Sample setting on a blank layer → set to Current & Below or All Layers.
  1. Accidentally on the regular Healing Brush without setting a source → either switch to Spot Healing Brush or Alt/Option‑click to define a source first.

Try those three in order; in most forum threads with the same symptom, one of them solves it immediately.

TL;DR:
Press Ctrl/Cmd+D to clear selections, make sure you’re on the right healing tool, and if you’re painting on a blank layer set Sample → Current & Below (or All Layers). That usually stops the zig‑zag/lasso behavior.

Information gathered from public forums or data available on the internet and portrayed here.