1 · Drop in your PDF
Every page is classified — A4, US Letter, A0, A4/Letter hybrid, 24/36/42-inch copy-shop rolls or “other” — with rotation and UserUnit handled. A stray Letter page in your A4 file stands out immediately.
For independent sewing pattern designers on Etsy and beyond
Catch print problems before your customers do.
PatternProof checks your PDF patterns for the things that cause “it printed the wrong size” messages and refund requests: mixed page sizes, a test square that isn’t 100%, and artwork that home printers may clip.
Your files are read in this browser tab only. Nothing is uploaded — not the PDF, not the file name.
- Page sizes A4, US Letter, A0, A4/Letter hybrid, copy-shop rolls — every page, rotation and UserUnit accounted for.
- Test square Click the corners of your 100 mm or 4 in square and see the scale it measures at, with honest uncertainty.
- Print margins A pixel-level estimate of artwork that sits too close to the edge for home printers.
- Multi-format report A4, Letter and A0 versions side by side in one CSV or PDF report.
Pattern checker
No pattern handy?
Add the A4, US Letter and A0 versions of the same pattern. You can preview the comparison for free; exporting a multi-format report needs a Batch Pass.
to see how the review works (one sample contains deliberate problems).
Pages
Crosshair: —
Measure the test square
- Zoom in on a corner of the square.
- Click the centre of the line at one corner, then at the next corner along the same edge.
- Optional: click two corners on the other edge for a second reading.
Keyboard: focus the page, move with arrow keys, press Enter to place a point.
Printable margin check
Pixels lighter than this are treated as paper. Lower it if light background tints are flagged; raise it to catch very pale lines.
Report
PatternProof Batch Pass — $9 once
Export multi-format reviews (A4 + US Letter + A0) as CSV or PDF for 30 days in this browser. One-time payment, no subscription, no account.
Built for the way pattern shops actually work
2 · Measure your test square
Click two corners of your 100 mm or 4 in square. PatternProof converts your clicks into true PDF coordinates, so zoom and rotation don’t matter, and tells you how precise the reading is.
3 · Check the edges
Choose your customers’ likely printer margin. PatternProof renders the page and highlights artwork that may be clipped. Full-bleed artwork is flagged separately so you can review it in context.
4 · Export a report
Download a CSV for your records, or with a Batch Pass compare your A4, Letter and A0 files side by side in one CSV or PDF report. Missing checks are listed as “not checked”, never quietly passed.
Honest limits: on-screen measurement confirms the PDF itself is drawn at the right size. Real printers vary, so always print the test page at 100% (“Actual size”) and measure it with a ruler. Margin results are pixel estimates of the rendered page.
Simple pricing
Free
$0
- One PDF at a time, unlimited
- All page sizes, thumbnails
- Test-square measurement
- Printable-margin scan
- One-file CSV report
Batch Pass
$9 one-time · 30 days
- Everything in Free
- Up to 3 PDFs: A4, US Letter, A0
- Mismatch summary vs. expected format
- Cross-file comparison of metadata and measurements
- Export one CSV or PDF report
Works in the browser you buy it in. No account, no subscription, card via Square or PayPal.
Questions
Are my pattern files uploaded anywhere?
No. PDFs are opened with a local copy of PDF.js inside your browser. File contents and file names are never sent to our server. The only things the server ever sees are payment checks and an anonymous “a free report was exported” count with your campaign source.
Does PatternProof run scripts or forms inside my PDF?
No. Document JavaScript, XFA forms and external fetching are disabled. The checker only reads page geometry and draws pages to an image.
Why does my measurement say “approximately”?
Your clicks are only as precise as a pixel on screen. PatternProof shows the uncertainty for the zoom you measured at; zoom in further for a tighter reading. A printer can still scale the page, so print the test page and check it with a ruler.
What counts as “too close to the edge”?
You choose the printer margin (¼ in / 6.35 mm is a safe default for home printers). Artwork inside that margin is flagged as possibly clipped, and artwork within 3 mm of it is flagged as close. Thin specks are ignored, and light tints can be excluded with the ink threshold.
What are the limits?
Up to 20 MiB per PDF and the first 120 pages per file. Pages beyond that are listed as skipped in the report. Password-protected or damaged PDFs are rejected with an explanation. JPEG 2000 images are not decoded in this privacy mode, so they may appear blank in previews.
How does the Batch Pass work?
Pay $9 once with Square or PayPal. The pass is stored as a secure cookie in this browser for 30 days. If you clear cookies or switch browsers, it won’t carry over. Contact Ettix if you need help.