Garment Pattern Grading Online Free — Size Up or Down in Your Browser

What is pattern grading?

Grading takes a base-size garment pattern and scales it up or down to produce a full size range — XS through XL, or numeric dress sizes. Each point on the outline moves according to grading rules so the proportions stay wearable across sizes.

Desktop CAD suites automate grading with measurement tables and formulas. Browser tools like AI Smart PDF Pattern Design offer a simpler path: grade pieces visually in Pattern Editor, then nest and export PLT without installing software.

When to grade online vs on desktop

• Grade online when you have a finished block and need a quick size run for sampling or a short production order.
• Use desktop parametric CAD (Seamly2D, Valentina) when every line is driven by body measurements and grading formulas.
• Combine both: draft parametrically on desktop, import DXF, grade or tweak in the browser, then nest and export PLT.

Step-by-step — grade a pattern in the browser

• Open Pattern Editor at aismartpdf.com/pattern-design and load or draw your base-size piece.
• Name the piece clearly (e.g. Front bodice — base size M).
• Use grading tools to create adjacent sizes — move key points proportionally for each step.
• Mirror symmetric pieces so left and right stay matched across the size range.
• Save the graded set to My patterns with a confirmed free account.
• Open Pattern Nesting, pack all sizes on fabric markers, and export PLT for cutting.

Grading tips for home sewists and small brands

Start from a block that already fits well in your base size — grading amplifies fit problems if the original is off.

Grade incrementally (one size at a time) rather than jumping several sizes in one step.

Check critical fit points — armhole, neckline, waist, hip — after each grade before cutting fabric.

Export DXF to share graded pieces with a factory CAD workflow, or PLT when sending directly to a plotter.

Grading + nesting + export in one workflow

Pattern Design connects grading to production prep. After you create a size range in Pattern Editor, Pattern Nesting arranges each size on fabric with your roll width and spacing, then exports a plotter-ready PLT file.

See our guides on free pattern making software, DXF editing, and PLT export for the full draw → grade → nest → cut workflow.