Convert PDF to Long Image Online Free
Stitch all pages of a PDF document into a single continuous, scrollable vertical image (PNG or JPG). Perfect for mobile infographics, social media long pictures, design portfolios, and messaging apps.
Standard PDF viewers display documents divided into discrete pages separated by margins and headers. When sharing reports on messaging platforms like WhatsApp, WeChat, or Slack, or embedding presentations into web feeds, a continuous vertical long image offers a seamless, scrollable reading experience without page flipping or reader download requirements.
DocxLab renders each vector page in high-resolution canvas memory and stitches them vertically into one unified graphic strip. Our intelligent canvas allocator dynamically prevents browser memory crashes on lengthy documents. Best of all, processing happens 100% in your browser—your documents never leave your computer.
How to Stitch a PDF into a Long Image
Convert all pages of any document into a unified, continuous vertical graphic file.
Upload PDF Document
Select or drag your PDF into the long-image generator window.
Configure Options
Select PNG or JPG format, rendering resolution (DPI), and inter-page spacing gaps.
Stitch & Download
Preview the continuous vertical image strip and download the high-resolution file instantly.
Frequently Asked Questions about PDF to Long Image Stitcher
Why should I convert a PDF into a single long image?
Long stitched images allow recipients to read entire multi-page documents seamlessly on mobile phones, chat apps (like WhatsApp, WeChat, or Telegram), and web articles without needing a PDF reader application.
What is the maximum page count or height limit?
Most web browsers cap canvas memory at approximately 16,000 to 32,000 vertical pixels. For large documents (over 30-50 pages), DocxLab automatically optimizes the scale factor to fit comfortably within browser hardware limits without crashing.
Should I choose PNG or JPG format?
Choose PNG for text-heavy documents, blueprints, and line drawings to keep lettering sharp. Choose JPG for documents heavy with photography to produce a smaller file size.
Are my confidential documents uploaded to any remote server?
No. The entire rendering and stitching process happens right inside your browser using the HTML5 Canvas API. Your file never leaves your machine.