Free Prepress Web Calculators I coded (TAC, Dielines, Barcodes, Shrink)

mahad_ikram

New member
Hey everyone,

As a prepress engineer, a huge part of my day is catching and fixing the same repetitive file mistakes before they hit the press like high TAC limits, missing bleeds on complex dielines, or barcode safe zone failures.

I got tired of calculating this manually every day, so I spent the last few weeks coding a suite of automated prepress web tools to do the math and speed up my own workflow.

I decided to open-source it and make the entire toolkit 100% free for the prepress and packaging community. There are no paywalls, no ads, and no sign-ups required.

The toolkit includes:

📦 Auto-Dieline & Bleed Generator (STE, RTE, Gable)

🖨️ TAC (Total Area Coverage) Ink Estimator

🔍 Barcode & QR Code Safe Zone Checker

📏 Shrink Sleeve Distortion Calculator

📝 FDA & EU Nutrition Label Formatter

🎨 CMYK to Pantone Color Converter

You can bookmark and use them here: Free Online Packaging & Design Tools

Since the people in this group actually know prepress inside and out, I’d love for you guys to test them out and see if you can break the math! Let me know if you run into any bugs or have ideas for other print-production tools I should code next.

Best,

Mahad
 

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Nice toolkit, thank you for sharing! I've been scratching the same itch from a different angle: instead of computing TAC from numbers, I render the actual PDF in the browser and show a TAC heatmap (plus separations and overprint preview), so you can see *where* the coverage blows past the limit. This is what I was missing without paid Acrobat Pro on Linux.

Free, no signup: Preflighter.app — online PDF print preview (free Acrobat alternative)

If anyone has files where it disagrees with what your RIP says, I'd love to hear about it — that's exactly the feedback I'm after.
 
   
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