sparq.tools
Fix laser-cut joints so they fit the first time - no calipers or math required.
Drop in your project SVG - slot sizes are detected automatically. The next step generates a test strip.
Cut this on scrap material. Each slot is slightly different - try each one and pick the best fit.
Red = cut lines · Blue = engraved labels · Cut both pieces from the same scrap sheet
After cutting and testing, click the number of the slot that gave the best fit:
Slot dimensions have been adjusted for your material. Test one piece before cutting the full sheet.
You cut a box and the finger joints fall apart, or an inlay will not seat. The design is fine; it just was not sized for your laser's kerf. FitFix takes the SVG you already have and offsets the right edges so the parts fit, no redrawing in your design software required.
It handles finger joints and tabs, and has a dedicated inlay and pocket mode for press-fit pieces. Everything runs in your browser and your file is never uploaded.
1. Choose what to fix. Joint and tab fit, or an inlay and pocket pair.
2. Upload your SVG. FitFix reads the geometry in the browser.
3. Dial in the fit. Use loose, snug, or tight, or enter an exact amount, and preview the change.
4. Download the corrected file. Cut it and the parts fit.
No. Upload the existing SVG and FitFix offsets the relevant edges, then gives you a corrected file.
Yes, and it runs entirely in your browser. Your file is never uploaded.
Measure it first with the kerf calculator, then come back and apply it here.