How to Make a Mitered Picture Frame

Tight Miters, No Gaps

A mitered picture frame is the project that teaches precision. The joints either meet perfectly or they don't — there's no hiding a bad miter. But once you learn the technique, you can make custom frames for any size artwork at a fraction of store prices.

This guide builds an 8x10 frame from 1 1/2-inch-wide stock, but the method scales to any size.

Tools You'll Need

  • Miter saw (a must for this project)
  • Tape measure and pencil
  • Clamps (corner clamps or band clamp help a lot)
  • Glue, small brush
  • Sandpaper (150 and 220 grit)
  • Glass cutter or pre-cut glass/acrylic (for the glazing)

Materials

  • 1 — 1x2 or 1x3 hardwood or pine board, 4 ft long (wider stock = wider frame)
  • Wood glue
  • Optional: spline wood or V-nails for reinforcement
  • 8x10 glass or acrylic sheet
  • 8x10 mat/backing board (foam core works)
  • Finish of choice

Cut List (for an 8x10 frame)

PartQtySize
Long rails2Cut at 45°, outside length ≈ 13 in
Short rails2Cut at 45°, outside length ≈ 11 in

The exact lengths: for an 8x10 opening with 1 1/2-inch-wide stock, the inside dimensions of each rail are 8 and 10 inches; the outside will be longer by twice the stock width. Mark inside lengths, cut 45-degree miters, and always cut a test piece first to verify your saw is dead-on 45 degrees.

Step-by-Step Build

1. Verify your saw angle

Cut two scrap pieces at 45 degrees, put them together, and check against a square. Adjust until the joint closes with zero gap. This one check determines the whole project.

2. Cut the rails

Cut all four pieces with matching 45-degree miters. Cut the long rails first, then the short rails. Label the inside face of each piece so you don't glue up the wrong orientation.

3. Dry-fit the frame

Assemble without glue. All four corners should close tightly. If there's a gap, check which cut is off and recut that piece — never force it.

4. Glue up

Apply a thin, even layer of glue to each miter face. Assemble and clamp — a band clamp that wraps the whole frame gives even pressure on all four corners at once. Check that the frame lies flat and wipe off squeeze-out immediately with a damp cloth.

5. Reinforce (optional but smart)

Miter joints are weak in tension. For a frame that lasts, add splines (thin wood keys across each corner) or drive small V-nails into the corners from the back. This single step turns a fragile frame into a durable one.

6. Finish and glaze

Sand with 150 then 220 grit, finish, and install glass, mat, artwork, and backing. Secure the backing with small brads or framing points.

Common Mistakes to Avoid

  • Trusting the saw's detent blindly. Most miter saws are slightly off — always test-cut.
  • Measuring outside instead of inside. Frame dimensions are always measured at the inside opening.
  • Too much glue. Thin coats bond better and squeeze-out stains the finish.

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