Can I check an entire Gerber ZIP?

Yes. Select or drop the final fabrication ZIP. Supported Gerber and Excellon entries are decompressed and inspected locally in your browser.

Are my PCB files uploaded?

No. ZIP extraction and file inspection run in your browser. EasyTool.me does not receive the file contents or filenames.

Is this a Gerber viewer or full DFM check?

No. This tool checks package structure and coordinate envelopes. It does not render artwork, calculate clearances or approve a board for manufacturing.

What should a basic two-layer Gerber package contain?

At minimum, identify top and bottom copper, an unambiguous board outline and drill data. Most boards also need top and bottom solder mask, with silkscreen and paste layers included when applicable.

Gerber ZIP Preflight Checker LOCAL
PCB 制造文件完整性预检与报告

Check the final PCB fabrication package—not just one layer. Detect missing copper, outline and drill files, mixed units, duplicate roles and coordinate-envelope problems before CAM review.

Package completeness report, not another Gerber viewerDrop a ZIP or individual Gerber/Excellon files. The archive stays on your device, and you can export a shareable HTML or machine-readable JSON report.

Drop your final Gerber ZIP here

Or select individual .gbr, .gtl, .gbl, .gts, .gbs, .gko, .gm1, .drl and related manufacturing files. ZIP and file contents are processed locally.

Choose ZIP or files

No files selected.

0manufacturing files

0recognized roles

0copper layers

0errors + warnings

File	Detected role	Units	Coordinate format	Definitions	Operations	Coordinate envelope	Status
Choose a fabrication ZIP, select individual files, or run the sample package.

Project checks

What makes this different from a Gerber viewer?

Checks the whole ZIP

A viewer helps inspect artwork visually. This checker first asks whether the fabrication package has the expected copper, outline, mask and drill components.

Finds cross-file inconsistencies

It compares unit declarations, layer roles and coordinate envelopes across the package—problems that are easy to miss when opening files one at a time.

Creates a handoff report

Export a self-contained HTML report for a teammate or manufacturer, or JSON for a release checklist and build pipeline.

Checks performed on a Gerber package

Core file presence: at least one copper layer, one unambiguous board outline/profile and drill data.
Layer pairing: top or bottom copper without its corresponding solder-mask file.
Duplicate roles: multiple files claiming the same top copper, outline, mask or other function.
Mixed units: inch and millimeter files in one package, which can indicate an export or scaling mistake.
Coordinate envelopes: artwork that extends outside or appears strongly offset from the board outline.
Per-file structure: Gerber format, units, apertures, X2 FileFunction, end command, Excellon tool table and operation counts.

Manufacturing data	Common extensions	Why it matters
Top and bottom copper	`.gtl / .gbl`	Defines the conductive artwork for both board sides.
Board profile	`.gko / .gm1` or X2 Profile	Defines the routed perimeter, and may include cutouts depending on export settings.
Plated / non-plated drill	`.drl / .xln`	Defines hole coordinates and tool diameters; some fabricators expect separate PTH and NPTH files.
Top and bottom solder mask	`.gts / .gbs`	Defines mask openings over pads and exposed copper.
Silkscreen	`.gto / .gbo`	Optional by side, but commonly used for references, markings and polarity.
Paste layers	`.gtp / .gbp`	Needed for stencil production and assembly, not usually for bare-board fabrication.

How to preflight before ordering

Generate fresh Gerber and Excellon outputs from the released PCB revision.
Create the exact ZIP you plan to upload to the board manufacturer.
Run that ZIP here and resolve structural errors, mixed units and unexplained duplicate layers.
Open the same ZIP in a trusted CAM viewer. Visually verify copper, polarity, mask openings, profile, slots and drill registration.
Run the manufacturer’s DFM review and compare its detected stack-up and dimensions with your design intent.

Important limitations

This is a structural preflight—not a Gerber renderer, netlist comparison or full design-for-manufacturing engine. A clean result does not prove minimum clearance, annular ring, solder-mask expansion, impedance, stack-up or electrical correctness. Coordinate envelopes are approximate and cannot replace visual CAM review. Always follow the requirements of the fabricator producing the board.

Related PCB manufacturing tools

Use the PCB manufacturing tools and checklist hub for the full release workflow. If you need paste artwork for assembly, continue to the Gerber-to-stencil guide after identifying the correct paste and profile layers here.

Format references

Privacy

Gerber files and ZIP contents are read with browser APIs in this tab. They are not uploaded, stored or sent to analytics. The downloaded report is created locally and contains the filenames you selected, so review it before sharing.

Method and references reviewed by EasyTool.me on July 31, 2026.