Hide Cash in Picture Frame (False Backing DIY)
A removable false back can create a shallow space for a small, flat cash packet inside a picture frame. Measure the frame’s usable depth first, keep the contents clear of the artwork and glazing, and support the new back around its edges. Treat the dimensions below as design targets, not code rules, and never force a deeper compartment into a shallow frame.
A picture frame can feel like an appealing place to keep a small reserve: familiar, out in the open, and part of a room you know well. The challenge is building a space that does not bow the backing, press on the picture, or make the frame unsafe to hang.
In my workshop, the first check is always depth, not the size of the cash. A frame may look deep from the side, yet leave little room once you account for glass, artwork, and the existing backing. This guide shows how to measure, make a removable false back, and check the finished frame. It is a concealment project, not a secure safe; it does not protect cash from theft, fire, or water.
Plan the Frame and Measure Usable Depth
Usable depth is the space left inside a frame after you account for the glazing, artwork, existing supports, and back. Measure the frame while it is off the wall, and use the actual cash packet you intend to store as a test piece. These checks help prevent a false back from bulging or putting pressure on the picture.
- Remove the frame from the wall. Place it face down on a clean, padded surface. Open the backing tabs or fasteners with care; do not bend them more than needed.
- Identify the parts. Note the glazing (glass or plastic), artwork, backing, retaining tabs, and hanger locations. Photograph the rear assembly before taking anything apart.
- Measure the clear depth. Use a ruler or depth gauge to find the space between the inside back of the frame and the rear of the artwork assembly. Check several points, since some frames are not perfectly even.
- Measure the contents. Fold the cash as it will be stored, then measure its thickness. Leave at least 10 mm (⅜ in) of clear depth for a small, flat packet, and allow more if your test packet needs it.
- Plan the panel. A 3 mm (⅛ in) plywood false back is a useful design target. Support it around the perimeter, with at least 12 mm (½ in) overlap on a retaining ledge so the panel cannot slip through.
Do not count the depth of soft or springy material as clear space. If the cash pushes against anything, reduce the contents or choose a deeper frame. Do not cut into a wall or use a building cavity for extra room.
Choose a frame that can take the added assembly
A suitable frame has enough depth for the packet, panel, and supports without forcing the artwork forward. A solid wood frame can be easier to adapt than a thin or fragile frame, but inspect the actual construction rather than relying on the frame material alone. Avoid a build if the rails are loose, cracked, or already bowed.
Check Artwork, Glazing, and Wall-Hanging Clearances
Clearance is the open space between stored cash and the artwork or glazing. Keep at least 6 mm (¼ in) between the compartment contents and both surfaces. This is a design target, not a building-code rule; its purpose is to avoid pressure that could shift the picture or stress the glass.
Set the frame face down and check where the glazing and artwork sit. Measure from the rear of that assembly to the planned inner face of the false back. Include any raised parts, such as backing tabs or spacers, in your measurements.
Do a dry fit before attaching anything. Put the cash packet in its intended position, then fit a temporary spacer or a piece of scrap at the planned panel depth. Reassemble the frame loosely and look from the side. The picture and glazing should remain seated as they were before.
Stop if the added depth pushes the artwork or glazing forward, lifts the retaining tabs, or makes the frame hard to close. Glass under pressure can crack, and bent tabs may no longer hold the assembly as intended. A deeper, purpose-built frame is the right fix; forcing the false back into place is not.
Keep the rear assembly easy to inspect
The false back should come out without damaging the frame. A removable panel also lets you check for dust, loose supports, or shifted contents. Avoid sharp metal edges near the cash, and do not let a new ledge cover the frame maker’s existing fasteners or hanger points.
Build and Fit the Removable False Back
A false back is a second rear panel that sits over a shallow storage space while remaining removable. The simplest build uses a perimeter ledge or spacer inside the frame and a thin plywood panel that rests on it. Fit each part to the measured frame; do not assume all four sides are square.
Materials and tools
For a small project, gather:
- 3 mm (⅛ in) plywood for the false back
- Wood for a narrow perimeter ledge or spacer
- A ruler, square, pencil, and fine-tooth saw
- Sandpaper and a suitable wood finish
- A discreet, removable retaining method, such as small turn buttons or a fitted panel held by the frame’s existing rear lip
Use the frame’s existing structure where practical. Do not rely on tape, weak adhesive, or unrated hangers to hold the panel or support the frame. If you add fasteners, keep them short enough that they cannot reach the artwork or glazing, and avoid splitting narrow frame rails.
Build in measured steps
- Make a paper or card template. Trace the inside rear opening and check the fit. This is easier to trim than plywood and helps reveal out-of-square corners.
- Fit the ledge. Add a shallow support around the perimeter. The false back needs support on all sides, with at least 12 mm (½ in) of overlap. Keep the ledge clear of tabs, hinges, and hanger hardware.
- Cut and smooth the panel. Transfer the template to 3 mm plywood, cut it, and sand the edges. A smooth edge is less likely to catch on the frame or snag stored contents.
- Test the fit without cash. Seat the panel and check that it lies flat. Confirm it can be removed without scraping the frame or bending the original backing tabs.
- Check the compartment depth. Place the folded cash packet in position, then confirm the 10 mm (⅜ in) clear-depth target and 6 mm (¼ in) clearance from the artwork and glazing. If either check fails, revise the layout.
- Add the retainer. Fit turn buttons or another suitable removable retainer so the panel stays seated when the frame is gently tilted. Keep the retainer easy to release for inspection.
Finish the new wood lightly and let it dry fully before reassembly. A finish is not needed for strength, and a heavy coating can make a close-fitting panel stick. The key is a neat, flat fit, not a tight press fit.
Verify Retention, Frame Weight, and Safe Mounting
A finished frame must keep its new panel seated and remain safely supported on the wall. Weigh the complete frame with its contents, then check the hanger’s published working-load rating. Choose a rating at least twice the finished frame’s weight, and use the fasteners and wall substrate specified by the hanger maker.
Check the entire assembly before rehanging:
- Confirm the false back overlaps the ledge by at least 12 mm (½ in) and rests on support around its perimeter.
- Gently tilt the frame over a padded surface. The panel should stay in place, and the contents should not slide into the artwork or glazing.
- Look at the front and sides for a new bulge, shifted picture, or loose tab.
- Weigh the finished frame and compare that figure with the hanger’s published rating.
- Install the hanger using the manufacturer’s stated fasteners and suitable wall material. A rating alone does not make an unsuitable fastener or wall surface safe.
If the frame feels loose or the picture shifts, take it apart and correct the fit. Do not compensate with stronger adhesive or a higher-rated hanger if the frame itself is weak.
Compare Common Frame Scenarios
These examples show how the same design targets guide different builds. They are planning scenarios, not test results; measure your own frame and contents before cutting materials.
| Frame situation | Best next step | Reason |
|---|---|---|
| Deep frame with a flat cash packet | Measure and dry-fit the planned spacer | It may allow the 10 mm clear-depth target and 6 mm picture clearance |
| Shallow frame or tight glazing | Use a deeper frame | A false back must not push the picture or glass forward |
| Loose tabs or bowed frame | Repair or replace the frame first | A new compartment cannot fix a weak rear assembly |
| Heavy frame after modification | Weigh it and check hanger rating | The rating should be at least twice the finished frame’s weight |
Two useful workshop examples
In a compact frame, the first test may show that the cash packet fits but leaves no room for the panel and clearance. The safe choice is to reduce the stored amount or select a deeper frame, not to press the glass forward.
In a deeper frame, a cardboard template may reveal that the rear opening is slightly uneven. Trimming the template to match the opening, then transferring it to plywood, helps the panel sit flat and maintain its overlap. In both cases, the measurements decide the design.
Conclusion
A well-made picture-frame compartment depends on careful measuring more than complex joinery. Use a supported 3 mm plywood panel, allow at least 10 mm of clear depth for a small flat packet, maintain 6 mm clearance from the artwork and glazing, and provide 12 mm of panel overlap. If the frame cannot meet those targets without pressure, use a deeper frame. Finish by checking the panel, frame weight, hanger rating, fasteners, and wall surface.
Frequently Asked Questions
These answers cover the main fit and safety checks for a removable cash compartment in a picture frame. Exact frame dimensions vary, so treat the figures as design targets and confirm them against your frame, contents, and hardware instructions before building.
How thick should the false back be?
A 3 mm (⅛ in) plywood panel is a useful design target for a small frame. Support it around its perimeter and check that it stays flat. If it flexes or does not fit the frame securely, change the support or panel design.
How much depth do I need for cash?
Allow at least 10 mm (⅜ in) of clear depth for a small, flat cash packet, then measure the actual packet. Keep the contents at least 6 mm (¼ in) from the artwork and glazing. If the frame cannot provide that space, choose a deeper one.
How much should the false back overlap its ledge?
Allow at least 12 mm (½ in) of overlap between the false back and its retaining ledge. The panel should rest on support around its perimeter and stay seated when the frame is gently tilted. Do not rely on tape or weak adhesive as a retainer.
Can I use cardboard instead of plywood?
Cardboard can work as a temporary template, but it is not the specified panel material for this design. Use 3 mm (⅛ in) plywood as the false back target, supported around its edges. Check the fit before adding cash or rehanging the frame.
Can the cash touch the glass or artwork?
No. Keep the contents at least 6 mm (¼ in) clear of both the artwork and glazing. Contact can press on the picture assembly, shift it, or stress the glass. If the clearance is not available, use a deeper frame or store less.
What if my frame is too shallow?
Do not force the panel into place or allow it to push the artwork or glazing forward. Reduce the contents or choose a purpose-built deeper frame. A false back should fit within the frame’s usable depth without bending tabs or changing how the picture sits.
How should I keep the panel removable?
Use a fitted panel and a suitable removable retainer, such as small turn buttons, if the frame can accommodate them. The panel should come out without damage and remain seated when gently tilted. Do not use weak adhesive or tape as the main support.
How strong should the picture hanger be?
Choose a hanger with a published working-load rating at least twice the finished frame’s weight. Follow the hanger maker’s instructions for fasteners and wall substrate. A rating does not replace correct installation or a sound frame.
Does this make a secure place for emergency cash?
No. A picture-frame compartment is concealment, not a safe. It does not provide tested protection against theft, fire, or water. Keep that limitation in mind when deciding what, if anything, to store.
Should I cut into the wall to make more room?
No. This project adds a removable compartment within the frame’s rear assembly; it does not require altering a wall or building cavity. If the frame lacks enough depth, use a deeper frame rather than modifying the wall.
(This article was written by one of our staff writers, Nathaniel Pierce. Visit our Meet the Team page.)
