PDF to JPG: Choose DPI, Quality, and Format

DPI controls the scale used when each PDF page is drawn to an image canvas. A higher setting creates more pixels in both dimensions, which can preserve small lettering and line detail but also requires more memory, more processing time, and usually more storage. It does not recover detail that was absent from a low-quality source scan.

Choose 72 DPI for lightweight previews, quick references, or small screen thumbnails. Choose 150 DPI as a balanced general-purpose setting for ordinary viewing and sharing. Choose 300 DPI when fine text, diagrams, or print detail matter and you can accept larger output files.

The best choice depends on the page and destination. Test one representative page at the intended zoom or print size. If 150 DPI keeps every important character readable, 300 DPI may only add weight. If tiny notes break apart at 150 DPI, try 300 DPI and inspect the actual downloaded file.

JPG suits photographs, scanned paperwork, and pages with continuous color changes. It uses adjustable lossy compression, so it can create compact results while introducing some artifacts around fine text or hard edges. The tool exposes a JPG quality slider from 60 through 100, with a default value of 90.

PNG uses lossless browser encoding and has no quality slider. It is often a better match for diagrams, interface captures, flat colors, and pages where sharp boundaries matter. PNG can be much larger than JPG for photographic or heavily textured pages, so lossless does not automatically mean practical for every document.

Format and DPI solve different problems. DPI determines rendered pixel dimensions; format determines how those pixels are encoded. A 300 DPI JPG may contain more usable detail than a 72 DPI PNG, while a 150 DPI PNG may keep a line drawing cleaner than a heavily compressed JPG at the same resolution.

The tool converts every page in sequence. It does not provide a page-range field, so extract a smaller PDF first if you only need a subset from a long document.

Higher JPG quality usually keeps more subtle texture and produces a larger file. Lower quality removes more information and may show ringing, block patterns, or fuzzy letter edges. Quality 100 still creates JPG output; it does not make JPG mathematically lossless or restore the original PDF objects.

Start near the default of 90, then compare pages that contain the smallest text and strongest contrast. A photo-heavy brochure may tolerate a lower setting better than a page of tiny black type. Do not judge only from the reduced result thumbnail because its display size can hide encoding artifacts.

If the converted images remain too large, use the image compressor after checking that the initial render has enough detail. That separate tool can process a batch, optionally cap dimensions, and retain the original when a compressed result would be larger. Avoid repeated JPG recompression when one deliberate export can meet the requirement.

Rendering occurs sequentially rather than creating every full-resolution page at once, but high-resolution canvases still use substantial memory. The interface shows a warning when a document has more than 50 pages and 300 DPI is selected because that combination can take several minutes and strain devices with limited memory.

For a long file, use 72 or 150 DPI unless close inspection proves 300 DPI necessary. Keep the tab active, avoid opening several conversion jobs at once, and make sure there is enough local space for the page images and ZIP. Select the cancel control if the chosen settings are clearly excessive; finished pages remain available.

The ZIP filename is based on the source name and ends in -images.zip. Individual images use the source base name followed by -page-, a one-based page number, and .jpg or .png. Predictable names help them sort correctly when extracted into a folder.

Use 72 DPI for previews, 150 DPI for balanced everyday output, and 300 DPI for detailed pages. Pick JPG for compact photo-like pages and PNG for lossless diagrams or flat graphics. Adjust JPG quality only when JPG is selected.

The PDF renderer, canvas, encoder, previews, individual downloads, and ZIP creation operate in your browser, so the document is not sent to a conversion server. Always inspect at least one full-size image before relying on a large batch. Also confirm page numbering after extracting the ZIP, since the image files represent pages rather than editable PDF content. Keep the PDF when you still need searchable text, links, forms, or vector graphics.