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Mirror PDF Margins

Prepare documents for double-sided printing or spiral binding by adding alternating gutter margins automatically. Fast, free, and 100% private browser tool.

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About Mirror PDF Margins

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Zero Server UploadsExecution occurs entirely in browser memory via WebAssembly and HTML5 Canvas.
HIPAA & GDPR ReadySafe for confidential tax forms, medical records, financial sheets, and legal contracts.
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1

Upload

Upload your book or manuscript PDF.

2

Mirror

The tool automatically adds a 1-inch gutter to alternating sides for binding.

3

Download

Download the print-ready file.

Automatically prepare your documents for double-sided book printing or spiral binding. This tool intelligently injects a 1-inch gutter margin on the left side of odd pages and the right side of even pages to ensure no text is clipped by binding or hole-punching.

Key Features

Alternating Gutters

Automatically detects odd/even pages to inject margins correctly.

Print-Ready

Ensures spiral binding or hole-punching won't clip your text.

Offline Processing

Modify your manuscripts securely on your own device.

Frequently Asked Questions

A gutter margin is extra space added to the inside edge of a page so that spiral binding or hole-punching does not destroy the text.

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