Traditionally, jigsaw puzzles have been made by using, wait for it, a jigsaw—though it's also called a scroll saw. If you've never seen one, a scroll saw has a fine, straight blade that's usually mounted vertically a little bit like the needle in a sewing machine. By running the blade up and down (hooray, power tools) and moving wood through it, you can cut fine patterns into wood. Note that the term "jigsaw" can also refer to a coping saw, which is a handheld power tool with a straight blade sticking out—great for cutting holes in walls, but perhaps not puzzles.
So that's great. But how do people make jigsaw puzzles today?
The short answer is: It's complicated. There are still high-end handmade puzzles on the market today, but commercial makers have typically moved on to other methods. Below, let's examine a few of the most popular methods.
1. METAL TEMPLATE GRIDS
Mass-produced commercial jigsaw puzzles are made of cardboard. Nobody hand-cuts cardboard with a jigsaw. So the game is all about making a cutting die (a sharp metal outline) that emulates that jigsaw cut. Once you have a cutting die, it can be used to stamp out countless cardboard puzzles.
In this video, starting at about 1:30, Ravensburger artisans show how they create their jigsaw puzzles using a "ribbon cut" grid system and a series of jigsaw-style edges. The metal template allows safety-gloved employees to snap in the edges of each piece, allowing for a unique pattern for each puzzle design.
2. SCROLL SAWS
For woodworkers, the only game in town is a real jigsaw. In this video, George Vondriska makes an elk jigsaw puzzle using some plywood, a computer print-out, and a scroll saw.
(Note: If you want to get into this, watch this 100-minute class.)
3. PSYCHOLOGICAL TORMENT
Steve Richardson says "they pay me to drive them crazy," describing the way he designs incredibly challenging jigsaw puzzles using an X-ACTO knife (which are then actually cut by hand). Calling himself Tormenter-in-Chief, Richardson has some famous clients, including the Gates family, the Bush family, and the royal family of Great Britain, among others.
Richardson's company only sells about 3,600 puzzles per year, all handmade. Every puzzle contains a single "clown" piece, the company's logo—though sometimes he doesn't actually fit in.
In this video, a laser cutter uses the Force on a Star Wars poster. It's fascinating to watch how it accomplishes the cuts, doing all the vertical cuts first (with little oscillations to get the wiggles in), then the horizontal cuts. Watch as, during the horizontal cutting stage, the pieces pop out!
5. RANDOM CUTS
In this video, Allegra Vernon walks us through all the steps that happen before the actual cutting. She discusses how images are selected, photographed/scanned, edited, and generally optimized to become good images for a jigsaw puzzle. Then she gets into the "random cut" process starting around 2:20. Both sections are fascinating. Vernon also explains the "ribbon cut" method employed above by Ravensburger.