PosteRazor FAQ: Quick Answers
Short answers to the most common questions — each links to the full guide.
Is PosteRazor really free?
Yes. PosteRazor is 100% free and open-source under the GNU GPL. No watermarks, no subscriptions, no feature limits. See what PosteRazor is.
Is PosteRazor safe to install?
Yes. It is open-source and works fully offline, so your images never leave your computer. Some antivirus tools flag it only because it lacks an expensive code-signing certificate — a common false positive for older open-source apps. Read the full safety breakdown.
How do I use PosteRazor?
Import your image, set your paper size, choose an overlap margin (10–15 mm works well), set the poster size, and export a multi-page PDF. Follow the 5-step tutorial.
Which paper should I use?
For durable posters, 120–160 gsm matte paper is the sweet spot. See the paper guide for weight, finish and ink settings.
Why is my poster blurry?
Your source image does not have enough pixels for the poster size. Check the effective DPI before printing — aim for 150–300 DPI. You can AI-upscale the image first. More fixes in troubleshooting.
My pages don’t align. What went wrong?
Almost always one of two things: the PDF was printed with “Fit to page” enabled (use “Actual size” / 100% instead), or the overlap alignment direction was inconsistent. Fix it here.
How do I assemble the printed pages?
Trim along the cut marks, overlap the margins, and glue or tape from the center outward. Full walkthrough: assembly guide.
Is there an online version without installing?
Yes — PosteRazor Online runs entirely in your browser. Nothing is uploaded; files stay on your device.
Does PosteRazor work on Mac / Android?
The desktop build runs on Windows, macOS (Intel binary via Rosetta 2 on Apple Silicon) and Linux. There is no official Android app — beware of fake “posterazor apk” sites. Details: Mac guide, Android options.
What are the alternatives?
Free options include Rasterbator, Blockposters and Posteriza; paid ones like Rapid Resizer; or skip DIY and use a professional printing service. Compared: all alternatives.