100% Free • Web-Based App

PosteRazor Online

Split any photo or map into a multi-page PDF right inside your web browser. Print on standard home paper (A4 or Letter) with millimeter-accurate overlap margins for seamless poster assembly.

No Installation Required 100% Privacy (Files stay on device) Multi-page High-Res PDF Output Custom Overlap & Crop Marks
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Live Interactive Tiling Canvas

Upload an image on the left to immediately preview cut seams, page counts, and alignment zones.

Generating PDF…
Preparing slice vectors and high-res DPI

How to Make a Giant Poster in 3 Simple Steps

PosteRazor Online replaces heavy desktop software with instant browser-based computation.

1

Upload Any Image

Drag and drop your high-definition photo, vector map, D&D battle grid, or illustration. All processing is client-side, meaning zero wait times and complete data confidentiality.

2

Tune Paper & Overlap

Choose your home printer’s standard format (A4, A3, or Letter). Set an overlap margin (5–15 mm recommended) so pages slide over one another smoothly when glued together.

3

Download & Assemble

Click “Download Multi-page PDF” to receive a print-ready document. Print at 100% scale, trim along the built-in alignment marks, and paste your mural together.

Frequently Asked Questions

Expert tips for error-free large-scale poster printing at home.

Does PosteRazor Online upload my personal photos to a server?

No. Your privacy is 100% safeguarded. The entire raster slicing, canvas rendering, and PDF generation runs locally inside your browser’s memory using HTML5 Canvas and JavaScript.

Why is the overlap margin so important?

Standard consumer inkjet and laser printers have mechanical tolerances and cannot print true 100% borderless without stretching. An overlap margin (typically 10 mm) provides a glue strip and prevents white gap lines.

How do I print the PDF without distortion?

When opening the generated PDF in Adobe Acrobat, Apple Preview, or Chrome, ensure you select “Actual Size” (100% scale). Do not check “Fit to printable area”, which causes misalignment.

What image resolution is recommended for giant murals?

For a poster viewed from 1 meter away, an effective DPI of 150 to 300 is ideal. Our real-time metric counter displays your current DPI so you never print a blurry poster.

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Learn More: PosteRazor Guides

Get the best results from your tiled poster with our step-by-step guides.