Where GIF pictures are still needed
GIF is supported by every browser and email program ever made. Some older websites, forums, email newsletter tools, intranets and simple embedded systems still accept GIF but not PDF, PNG or WEBP. Converting PDF pages to GIF makes them usable there.
What happens when you convert
Each page is drawn at 96, 150 or 300 DPI and saved as a still GIF picture. GIF stores at most 256 colours, so the colours of each page are reduced to the best 256-colour palette. Pages wider than 2000 pixels are scaled down to 2000 pixels wide. Several pages download together as a ZIP, or one by one from the file list.
How pages will look
Text, tables, diagrams and charts with flat colours look clean in GIF. Photographs and soft colour gradients show visible banding or grain, because 256 colours are not enough for them. This tool does not create animations — each page is a separate still GIF.
Common problems and how to fix them
Photos look grainy: use PDF to JPG or PDF to PNG instead. The GIF is too large: choose 96 or 150 DPI. You wanted an animated GIF of the pages: convert to pictures here, then combine them in an animation tool.
Good habits
Use GIF only when a system requires it, keep text-heavy pages at 150 DPI for readability, and keep the original PDF.