R4 Corner Rounder Punch – Portable Paper Trimmer for DIY Crafts

Create Perfectly Rounded Corners Every Time

Give your business cards, photos, greeting cards, and craft projects a clean, professional finish with this R4 Corner Rounder Punch. This compact, portable paper trimmer makes smooth arc-shaped cuts in seconds — no scissors, no wobbling edges, no frustration. Whether you're a scrapbooker, card maker, office professional, or DIY enthusiast, this little tool delivers big results.

Made in Mainland China.

Key Features

• R4 Arc Corner Cut: Produces consistent, smooth rounded corners with a 4mm radius for a polished look
• Durable Construction: Built from a sturdy plastic and metal combination for long-lasting performance
• Wide Compatibility: Works on business cards, cardboard, PVC sheets, photos, greeting cards, and more
• Compact & Portable: Small enough to toss in a craft bag or desk drawer — measures just 60×55×25mm (2.36×2.17×0.98 in)
• Available in 5 Colors: Choose your favorite to match your creative style
• Easy One-Hand Operation: Simply align the paper edge and press down for a clean cut

Specifications

• Size: 60×55×25mm (2.36×2.17×0.98 in)
• Material: Plastic + Metal
• Corner Radius: R4 (4mm arc)
• Colors Available: 5 color options
• Package Contents: 1× R4 Corner Rounder Punch

Best Use Tips

1. For the smoothest cut, ensure your paper is placed at a precise 90° right angle to the cutter edge. Angles greater or less than 90° may result in slightly uneven corners that need minor trimming.
2. Always align the paper edge flush with the cutter guide before pressing — an off-center placement will produce uneven rounded corners.
3. Cut no more than 5 sheets of 70g copy paper at once. Overloading the cutter may jam or dull the blade prematurely.
4. Not suitable for soft, flexible materials such as plastic wrap or thin film sheets.

Perfect For

• Scrapbooking & card making
• Business card finishing
• Photo album projects
• PVC ID card edges
• Gift tags & greeting cards
• School and office projects

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For more information on safe craft tool practices, visit the U.S. Consumer Product Safety Commission (CPSC) for guidance on consumer product safety.

Learn more: Chinese paper cutting

Frequently Asked Questions

Q: What paper radius does the R4 Corner Rounder Punch cut?

A: The R4 Corner Rounder creates a 4mm arc radius on each corner, giving your cards, photos, and paper projects a smooth, professional rounded finish consistent with standard business card corner rounding.

Q: How many sheets can I cut at once with this corner punch?

A: It is recommended to cut no more than 5 sheets of standard 70g copy paper at a time. Cutting too many sheets simultaneously may cause jamming or uneven corners and can dull the blade faster.

Q: Is this corner rounder suitable for plastic or laminated sheets?

A: This corner punch works well on PVC sheets and cardboard in addition to paper and photos. However, it is not suitable for soft, flexible materials like plastic wrap or thin film, as these materials will not cut cleanly.

Q: Why are my rounded corners coming out uneven?

A: Uneven corners are usually caused by one of two things: (1) the paper is not aligned flush at a 90° right angle with the cutter guide, or (2) the punch is not pressed fully from top to bottom in one clean motion. Make sure your paper is straight and fully seated before pressing down for the best results.