PCB Panelization for JLCPCB and PCBWay: Tabs, V-Scoring, and Gerber Setup for Batch Manufacturing

Order one copy of a PCB from JLCPCB or PCBWay and you'll pay almost the same price as ordering five — both fabs price in flat tiers by board area and quantity, not a strict per-unit rate, so a single small board eats minimum-order overhead you never get back. Panelizing — arranging multiple copies of a board (or several different boards) into one larger panel that the fab cuts or snaps apart after manufacturing — is how production shops and savvy hobbyists actually use that pricing structure instead of fighting it. This guide covers why and how to panelize, the two breakaway methods fabs support, and the KiCad workflow to generate a panel yourself.

Why Panelize at All

Beyond better unit economics, panelizing solves a real assembly problem: if you're hand-populating or reflowing small boards, a tiny PCB is awkward to hold, tape down, or run through a toaster-oven reflow process without it sliding around. A panel of identical boards gives you one larger, easier-to-handle piece to solder paste, place components on, and reflow, and you snap the individual boards apart only at the end. It also lets you combine genuinely different boards — a main board and a small breakout, for instance — onto one panel and one manufacturing order, which can be cheaper than two separate small orders even after accounting for the panelization work.

V-Scoring vs. Mousebites (Tabs)

Fabs support two standard ways to let you separate panelized boards after manufacturing, and the right choice depends on your board's edge shape and how clean you need the final edge to be.

MethodHow It WorksBest For V-scoringA V-shaped groove cut partway through the board from both sides along a straight line; boards snap apart cleanly along the scoreStraight-edge rectangular boards; cleanest final edge, but only works on straight lines, not curves or complex shapes Mousebites (tabs)A row of small drilled perforations connecting adjacent boards, like a tear-off stamp sheet; boards are snapped or clipped apart at the tabsAny board outline, including curved or irregular shapes; leaves small nubs at the tab locations that usually need a quick file or sand pass

Most fabs will V-score for free or a small fee if every board edge in your panel is a straight line, and default to mousebites for anything with a non-rectangular outline. If your project cares about a perfectly smooth edge (an enclosure panel, a front-facing cosmetic board), V-scoring is worth designing your outline around; if you're panelizing oddly-shaped boards or don't mind a five-second deburring pass per board, mousebites are more flexible and often the fab's default.

Designing the Panel in KiCad

KiCad doesn't have fully native panelization tools built into the main PCB editor, but the community-maintained kikit command-line tool has become the de facto standard for generating fab-ready panels directly from a finished KiCad board file. A basic kikit panelization command takes your single-board KiCad PCB, a grid specification (rows and columns), and a tab/V-score method, and outputs a new panel-level PCB file with the frame, rails, fiducials, and tooling holes most fabs expect on a production panel.

At minimum, a usable panel needs a frame or rail around the outer edge wide enough for the fab's clamps and any mouse-bite tabs, tooling holes or fiducials if you want automated pick-and-place assembly (most hobby panelization skips this unless you're sending the panel to an assembly service), and consistent spacing between boards that accounts for whichever breakaway method you chose — V-score lines need to run the full straight edge, while mousebite tabs need enough gap between boards for the drill perforations without weakening the panel so much it flexes during handling.

Submitting to the Fab

Both JLCPCB and PCBWay accept a panelized Gerber/drill file set the same way they accept a single board — upload it, and in most cases the fab's online viewer will show you the full panel layout before you confirm the order. It's worth explicitly stating your breakaway method (V-score or mousebites) in the order notes even when it's visible in the Gerbers, since miscommunication here is one of the more common causes of a panel arriving with the wrong separation method and nubs or edges you didn't plan for. Panel size limits vary by fab and by their panelization service tier — check the specific size and quantity limits on the fab's PCB ordering page before finalizing a large panel, since exceeding their standard panel dimensions usually triggers a manual quote rather than the instant online pricing you'd get for a standard single-board order.

When Panelizing Isn't Worth It

For a one-off prototype you're hand-soldering with a handful of through-hole parts, panelizing adds design time for a pricing benefit you may not need — most fabs' per-unit price for a single small board at low quantity is already low enough that the savings from panelizing don't justify the extra Gerber-generation step. It earns its complexity once you're ordering boards in batches of ten or more of the same design, running SMD reflow assembly where panel handling genuinely helps, or combining several different small boards into a single manufacturing run to spread fixed costs across all of them.

Safety Notes

Snapping boards apart at V-score lines or mousebite tabs creates sharp edges and occasionally small flying fragments, particularly on FR4 fiberglass boards — wear eye protection when breaking apart a panel, especially a larger batch, and expect to file or sand mousebite nubs rather than leaving sharp tab remnants on a board that will be handled regularly. Keep panel breakaway work away from populated, powered boards and loose components, since snapping can send small plastic or fiberglass shards across a bench.

Panelization is one of those skills that looks like unnecessary overhead the first time you do it and becomes an obvious default once you've ordered a dozen hobby boards the expensive way. A few extra minutes in kikit before submitting an order routinely pays for itself the moment you need more than one copy of anything.