How to flip or reflect an object in AutoCAD

Short Answer

Yes — in AutoCAD, the standard way to flip or reflect an object is with the MIRROR command. Select the object, define the mirror line with two points, then choose whether to erase the original. This is the fastest professional method for 2D drafting. It does not physically “flip” dynamic block actions unless designed for it.

What You Need to Know Before

Warning: Mirroring text, dimensions, or attributed blocks can create unreadable or unexpected results if text mirroring behavior is enabled. Also, if the object is on a locked layer or inside a block/xref, the mirror result may fail or not edit the source geometry as expected.

How to flip or reflect an object in AutoCAD

• Command: MIRROR

• Shortcut: MI

• Quick Steps:

  1. On the Ribbon > Home tab > Modify panel, click Mirror, or type MI and press Enter.
  2. Select the object(s) to reflect, then press Enter.
  3. Pick the first and second points of the mirror line, then at Erase source objects? [Yes/No], choose No to keep the original or Yes to remove it.

Variables & Settings

• System Variable: mirrtext (Default: 0)

• Expert Setting: When MIRRTEXT=0, mirrored text stays readable after using MIRROR. When MIRRTEXT=1, text is reversed exactly as geometry, which is usually undesirable for production drawings unless intentionally required.

Why it Fails

• Cause 1 (Geometry): The mirror line is picked in the wrong direction or location, so the reflected object lands in an unexpected position.
• Cause 2 (layers/Locks): Objects on locked layers cannot be modified, and geometry inside an external reference cannot be directly mirrored in the host drawing.
• Cause 3 (Command/Logic): Users often choose Yes at the erase prompt and accidentally delete the source object, or expect MIRROR to redefine block internals instead of creating mirrored geometry.

Quick Fix & Best Practice

• Quick Fix: Run MIRROR again, use object snaps to define an exact mirror line, and set MIRRTEXT to 0 before mirroring text or dimensions.
• Manager’s Verdict: Use MIRROR for fast, clean symmetric drafting in plans, details, and layouts. Avoid mirroring annotation-heavy blocks blindly; check text, attributes, and standards before using mirrored copies in issued drawings.

FAQ

Can I mirror text in AutoCAD without reversing it?

Yes, set MIRRTEXT to 0 before using the MIRROR command.

How do I keep the original object when mirroring?

At the Erase source objects? prompt, choose No.

Can I mirror objects in a block or Xref directly?

Not directly in an attached Xref; edit the source file or block definition if needed.

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