25cm straight lines without ruler

Before beginning this tutorial, I suggest you to refer to “Be a pro at dot-to-dot mastering straight lines



  • Turn the paper 45 to 60 degrees. Adjust it to your convenience.
  • Before drawing the line, simulate the gesture just above the paper*.
  • Draw using the movement of your whole arm and chest.
  • Draw parallel lines along the edges of the sheet, both widthwise and
  • Check your lines carefully using the edge of another paper as a guide.
  • this step is called “ghost drawing


  • Flip your paper, and retrace the slanted line using the “ghost drawing”. Your line should be much better.
  • That movement may not seem natural to your arm (rotating by default). However, try to memorize and reproduce that same line covering the entire paper.

  • TIP

    Breath out when you trace the line

    After mastering A4 paper length, get ready for the A3 paper, 42cm in length !
    Try it and let me know of your results in the below comment box.

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    About The Author


    Hello ! My name is Chou-Tac. I am a product designer from France. If the sketching methods I’ve acquired aid me in my life and in my industrial design career, I believe that they can also help you reach your design goal as a student or professional. My aim to help you all along with your design projects and journey. Anytime, feel free to leave a comment in the blog or send me an email at [email protected] : )


    • Kurigoku

      Reply Reply October 4, 2015

      I really appreciate the tips! I will be doing them all until I become an expert 😀

      • Chou-Tac

        Reply Reply October 6, 2015

        Enjoy Kurigoku. That’s exactly the right mindset. Master it till it become a habit 🙂

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