Choosing the right format, resolution, and settings for every use case
PDF-to-image conversion comes up in a handful of situations: you need to post a PDF page to social media, drop a chart from a report into a slide deck, extract a diagram from a technical document, or generate thumbnails for a document library. The conversion itself takes seconds. What actually matters is the settings you choose before you click convert.
This guide focuses on those decisions: format, resolution, and when PDF-to-image is the wrong approach entirely.
Watch: How to Convert PDF to Image with PDFHaul (step-by-step walkthrough)
When Converting to Image Makes Sense (and When It Doesn't)
PDF-to-image is the right move when:
You need to post content on a platform that doesn't support PDFs (Instagram, Twitter/X, most social media)
You're inserting a PDF page into a slide deck and want pixel-perfect rendering
You need to extract a specific diagram, chart, or graphic from a longer document
You're generating document thumbnails or preview images for a website or library
You want to share a single page without giving the recipient the full PDF
PDF-to-image is the wrong move when:
You need the text to be searchable or selectable. Images don't have text layers. If searchability matters, keep the PDF.
The document has hyperlinks. Links don't survive conversion to image format.
You need to fill out or interact with a form. All form interactivity is lost.
File size is the main concern. A high-quality PNG of a single PDF page is often larger than the whole PDF.
The document will be edited later. Converting to image locks the content.
JPG vs PNG: Which Format to Use
This is the most consequential setting in PDF-to-image conversion, and most guides oversimplify it. Here's how to think about it:
Use JPG when: the PDF page is primarily photographic content (product photos, real estate images, scanned artwork). JPG compression handles gradients and tonal variation efficiently. The resulting files are significantly smaller than PNG for the same visual quality, which matters for email and web use.
Use PNG when: the PDF page contains text, diagrams, charts, line art, or anything with sharp edges. JPG compression introduces visible artifacts around high-contrast edges, making text look slightly fuzzy. PNG's lossless compression keeps those edges crisp. Also use PNG when you need transparency support, though most PDF pages have a white background and transparency is rarely a factor.
The practical rule: when in doubt, use PNG. You lose some file size efficiency but gain quality assurance. For anything that will be printed or projected, PNG is almost always the right call.
Avoid converting to JPG and then re-saving the JPG. Each save cycle re-encodes the image and introduces new compression artifacts. Convert once, save once, and keep the original PDF if you need to regenerate.
Resolution (DPI): What Number to Use and Why
DPI is where most people either over-engineer or under-engineer the conversion. The right number depends entirely on what you're doing with the image afterward.
72 DPI is screen resolution. This is sufficient for any use case where the image will only be viewed on a monitor: social media posts, website thumbnails, email previews. Files are small and load fast. At 72 DPI, a standard A4 PDF page produces an image roughly 595x842 pixels.
150 DPI is a useful middle ground for presentations. Slide decks are typically displayed at 1920x1080px on a projector or screen. A 150 DPI conversion of an A4 page produces roughly 1240x1754px, which is more than enough for a full-slide image. File sizes stay manageable.
300 DPI is the standard for print. At this resolution, a letter-size page produces an image of 2550x3300px, which prints cleanly at full size. Use 300 DPI for anything going to a printer, an offset press, or being embedded in a print-ready layout.
600 DPI is for large-format printing or documents with very fine detail (technical drawings, dense typography, engineering schematics). Files at this resolution are large. A single letter-size page at 600 DPI PNG is typically 15-40MB depending on content. Only use this when the detail genuinely requires it.
Selecting a higher DPI than your use case requires doesn't improve quality for that use case. A 300 DPI image displayed on a 96 DPI screen looks identical to a 96 DPI image. It just takes longer to load and uses more storage.
How to Convert PDF to Image with PDFHaul
PDFHaul's PDF to image tool supports JPG and PNG output at multiple DPI settings. Files are processed server-side and deleted automatically after 2 hours.
Upload your PDF. Drag and drop the file or click to browse. Files up to 100MB are supported. Password-protected PDFs need to be unlocked first.
Select the pages to convert. You can convert all pages, a specific range (e.g., pages 3-8), or individual pages. For large documents, only converting what you need keeps output files organized and avoids generating dozens of images you won't use.
Choose format and DPI. Select JPG or PNG and set your resolution. If you're unsure, PNG at 150 DPI is a safe default for most uses. Use 300 DPI if the images will be printed.
Convert and download. Multi-page conversions download as a ZIP archive with files named by page number. Open a few pages and inspect them at 100% zoom before using them in your final deliverable.
Settings by Use Case
Social media (Instagram, LinkedIn, Twitter/X): JPG, 96-150 DPI. Most platforms recompress images on upload anyway, so starting at a higher resolution provides diminishing returns. For LinkedIn document posts, individual page images at 150 DPI JPG strike the right balance.
Slide deck integration (PowerPoint, Keynote, Google Slides): PNG, 150 DPI. PNG keeps text and diagram edges sharp when projected. 150 DPI gives you enough resolution for a full-slide image without bloating the presentation file.
Website or documentation: JPG for photographic content, PNG for anything with text or diagrams. 72-96 DPI for images that display at normal web sizes. If you're showing a full-page document preview that users can zoom into, 150 DPI is worth the extra file size.
Extracting a diagram or chart: PNG, 300 DPI. You want the maximum fidelity when pulling out a specific graphic, especially if it contains labels or fine lines. Crop to the diagram after converting.
Professional printing: PNG, 300 DPI minimum. If the source PDF was print-ready (300 DPI images, CMYK color space), the converted image will be too. If the source PDF was screen-optimized, no amount of upsampling at conversion time will add detail that wasn't there.
Document thumbnails: JPG, 72 DPI, first page only. Thumbnails display small, load fast, and don't need quality beyond what a screen can render. A 72 DPI JPG of a standard page is typically 30-100KB.
Understanding Output File Sizes
PDF-to-image often produces files that are much larger than the original PDF. This surprises people, but it makes sense: a PDF stores text as vector data (infinitely scalable, very compact), while an image stores every pixel individually.
Rough size expectations per page:
72 DPI JPG: 50-200KB for a typical document page
150 DPI PNG: 300KB-2MB depending on content complexity
300 DPI PNG: 1-10MB per page for text documents, more for graphics-heavy content
600 DPI PNG: 5-40MB per page
If output file size is a problem:
Drop the DPI to the minimum your use case requires
Use JPG instead of PNG for photographic or mixed content
Convert only the pages you need, then compress the resulting images as a second step if needed
Consider whether you actually need the image at all - sometimes sharing the original PDF is the right answer
A Special Case: Scanned PDFs
Scanned PDFs are already images internally. The PDF is just a container wrapping one bitmap image per page. When you convert a scanned PDF to image format, you're essentially extracting those bitmaps.
This has two important implications:
Resolution is already fixed. If the document was scanned at 150 DPI, extracting it at 300 DPI doesn't add detail - the converter is just upscaling the existing bitmap. The original scan quality is the ceiling. Check what resolution the PDF was scanned at before choosing your output DPI.
File sizes can be unexpectedly large. A 20-page scanned document at 300 DPI PNG can easily exceed 200MB in extracted images, even if the source PDF was only 15MB (because PDFs apply additional compression to the stored bitmaps). If you're working with scanned documents, JPG at the scan's native resolution is usually the most efficient output.
Privacy and Security Considerations
A few things worth knowing before you convert and share:
Images bypass PDF security. If a PDF has a password or restrictions on printing and copying, converting it to an image removes those restrictions entirely. The images can be freely shared and printed. Be mindful of this if you're handling documents that have access controls for a reason.
Metadata may carry over. Depending on the conversion tool, image files may inherit metadata from the PDF including author name, creation date, and software used. If you're sharing images externally and prefer to keep that information private, strip metadata using ExifTool or a similar utility before distributing.
Watermarking. If you're converting proprietary content to share publicly, consider adding a watermark before or after conversion. Once a PDF page is an image, it's easy to screenshot or save - harder to trace back to the source.
PDFHaul does not retain uploaded files. All conversions are processed and deleted within 2 hours.
Troubleshooting Common Problems
Converted images look blurry or pixelated
Almost always a DPI issue. If you're viewing the image at a large size and it looks blurry, the resolution was too low for that display size. Reconvert at a higher DPI. If the blurriness was present in the original PDF, no conversion setting will fix it - the source document is low resolution.
Text in the converted image looks fuzzy
Switch from JPG to PNG. JPG compression introduces artifacts around high-contrast edges like text characters, which makes them look slightly soft. PNG handles text cleanly.
Output files are much larger than expected
This is normal for high-DPI PNG conversions of text-heavy documents. Either reduce the DPI, switch to JPG for non-critical content, or convert only the pages you actually need.
Colors in the image don't match the PDF
Usually a color space issue. Professional PDFs sometimes use CMYK color profiles, while image formats default to RGB. The conversion should handle this automatically, but if you're seeing noticeable color shifts, try PNG format (which handles color profiles more reliably) and check whether the source PDF was prepared for print (CMYK) or screen (RGB).
Transparent areas show as white
JPG doesn't support transparency. If the PDF has transparent elements (uncommon in standard documents, more common in design files), use PNG. Note that most PDF pages have a white background anyway, so this is rarely a practical issue.
Frequently Asked Questions
Does converting PDF to image reduce quality?
It depends on your settings. At 300 DPI PNG, the converted image is visually indistinguishable from the PDF page at normal viewing sizes. At 72 DPI JPG, there's visible compression and lower resolution, which is fine for web use but not for print. Match the settings to your actual use case.
What's the best format for converting a text document?
PNG. JPG compression creates visible artifacts around text edges, making them look slightly soft. PNG is lossless and keeps text sharp. For documents that are primarily photographic, JPG is fine.
Can I convert password-protected PDFs to images?
You need to remove the password protection first. Once the PDF is unlocked, conversion works normally. Note that converting bypasses any PDF restrictions on printing or copying - the resulting images have no access controls.
Will the converted images be searchable?
No. Images don't contain text data, so there's nothing to search. If you need searchable content, keep the original PDF. Alternatively, run OCR on the images after conversion to generate a text layer, though this adds complexity and isn't always accurate.
What DPI should I use for printing?
300 DPI for standard printing. 600 DPI for large-format prints or documents with very fine detail like technical drawings. If you're printing on a standard office printer at letter size, 300 DPI is sufficient and produces a manageable file size.
How many pages can I convert at once?
PDFHaul supports converting any number of pages from documents up to 100MB. For large multi-page documents, all pages download as a ZIP archive with files named sequentially by page number.
Ready to convert your PDF? Try PDFHaul's PDF to image tool - free, no account required, files deleted automatically after 2 hours.
Peter
Founder of PDFHaul and Bultech
Building tools that make working with documents faster and simpler.