PDF to JPG vs PNG: Which Format Should You Choose?

Converting a PDF to images is one of the most common file tasks people do — sharing a single page, pulling a chart out of a report, or preparing slides for a presentation. The format you choose, JPG or PNG, affects file size, visual quality, and how the images can be used downstream. Picking the right one takes about thirty seconds once you understand the trade-offs.

When to Use JPG

JPG is the right choice when the PDF contains photographs, rich illustrations, or any content where a modest reduction in quality is acceptable in exchange for a smaller file.

The compression JPG applies is lossy: some pixel data is discarded during encoding. At high DPI settings the loss is barely perceptible, but it is real. That trade-off is worth it in several common situations:

• Email attachments. Smaller files reach inboxes faster and stay within size limits.
• Web and social media. Browsers and platforms handle JPG well, and pages load faster with smaller images.
• Photographic content. JPG was designed for photographs. Gradients and continuous-tone imagery compress efficiently with minimal visible degradation.

JPG does not support transparent backgrounds. If your PDF has elements that sit on a transparent layer, those areas will be filled with a solid color (usually white) on export.

DPI guidance for JPG exports:

• 72 DPI — Web use, social media posts, previews. Smallest possible files.
• 150 DPI — General sharing, slide decks, internal documents. Good balance.
• 300 DPI — Print-ready output. Use this when the image will be printed or placed in a layout tool.

FileCrank's PDF to JPG tool lets you set DPI before converting, so you can match the output to the destination without guessing.

When to Use PNG

PNG is the right choice for text-heavy documents, technical diagrams, charts, presentations, and anything where sharpness and accuracy are non-negotiable.

The compression PNG uses is lossless: every pixel in the output is identical to the source. No data is thrown away. That matters when:

• Text must stay crisp. Lossy compression introduces artifacts around high-contrast edges — the kind that appear along letters and lines. PNG avoids this entirely.
• Diagrams and charts are involved. Fine lines and small labels remain accurate at any zoom level.
• Transparency is needed. PNG supports alpha channels. If the PDF page has a transparent background, that transparency is preserved in the export.
• The image will be edited further. Starting from a lossless source means no generational quality loss if the image is re-exported later.

PNG files are larger than their JPG equivalents for the same DPI. For most document content the difference is worth it. FileCrank's PDF to PNG tool handles the conversion without any quality compromise.

JPG vs PNG: Quick Comparison

How to Convert PDF Pages to Images (with Page Preview)

Most online converters process the entire PDF and hand you back every page. FileCrank works differently: it shows you a thumbnail grid of every page first, so you select exactly the ones you need before anything is converted.

1. Upload your PDF. Go to PDF to JPG or PDF to PNG and drop your file onto the upload area. FileCrank generates a thumbnail for each page.

2. Select pages and set DPI. Click the pages you want to include — one page, a few, or all of them. Then choose your DPI: 72, 150, or 300. The selection is visible before you commit to conversion.

3. Convert and download. FileCrank processes only the pages you selected. If you picked one page, you get a single image file. If you picked several, you get a ZIP archive containing each page as a separate image.

This page-level control matters when a PDF has forty pages but you only need three. There is no reason to download a ZIP of forty images and sort through them manually.

Common Questions

Does converting a PDF to JPG reduce quality? JPG is lossy, so yes — some quality is lost during compression. At 150 or 300 DPI the difference is negligible for photographs and general content. If your PDF contains fine text, technical diagrams, or small labels, PNG is the safer choice because it introduces no compression artifacts.

Can I convert just one page instead of the whole PDF? Yes. FileCrank shows a thumbnail grid of every page in your PDF. You select exactly which pages to convert and only those are included in the output. You are not forced to process pages you do not need.

What DPI should I use? 72 DPI for web use and social media — these produce the smallest files and load quickly in browsers. 150 DPI for general sharing and internal documents — a solid middle ground. 300 DPI when you need print-ready images or plan to place the output in a layout tool like InDesign or Figma.

Which format is better for presentations? PNG. Lossless compression keeps text crisp and preserves any transparency that existed in the original slides. JPG artifacts are subtle in photographs but visible on slide titles and bullet text, especially on a projected screen.

When size matters, choose JPG. When quality or transparency matters, choose PNG. Both tools on FileCrank are free with no account required — upload your PDF, pick your pages, and download your images in the format that fits your workflow.

When the Choice Is Made for You

In many situations the JPG-versus-PNG decision is not really yours to make — the platform or workflow dictates it.

Platforms that only accept JPG: some government form portals, job application systems, and older content management systems explicitly list JPG as the only accepted image format for uploads. This is usually a legacy constraint: JPG was the universal web format before PNG gained broad support, and some systems were never updated. If you are filling out an online application that lists accepted formats in the upload field, check before converting — uploading a PNG to a JPG-only system will result in a rejected submission or a silent format error.

Specific CMS and e-commerce platforms: product image uploaders on some e-commerce platforms apply their own re-compression on upload, making the format you submit less important for the final output — but they may still reject non-JPG inputs at the validation step. Check the platform documentation before bulk-converting a product catalogue.

Use cases that require transparency: this works in the opposite direction. If you are converting a PDF slide with a logo on a transparent background and plan to place that image over a coloured section in a web page or document, PNG is the only format that preserves the transparency. JPG will fill the transparent area with white (or occasionally black), making the logo appear with a box around it. There is no way to recover transparency from a JPG after the fact — the information is permanently discarded at the moment of conversion. If you are not sure whether your PDF contains transparency, convert one test page to PNG and check; if the background is transparent in the PNG, it would have been lost in the JPG.

File Size Reality: What 300 DPI Actually Produces

The DPI setting you choose has a larger effect on output file size than most people expect, and the difference between JPG and PNG at the same DPI is substantial enough to matter in practice.

A single A4 page converted to PNG at 300 DPI typically produces a file between 5 MB and 15 MB, depending on how much content is on the page. A page with dense diagrams, charts, and colour blocks sits at the higher end. A page with mostly white space and black text sits at the lower end. At 150 DPI, the same page in PNG is typically 1.5–4 MB. At 72 DPI it drops to under 500 KB.

The same page converted to JPG at 300 DPI is typically 500 KB to 2 MB — roughly one-fifth to one-tenth the size of the PNG equivalent. At 150 DPI, JPG output is usually 150–600 KB.

When this size difference matters:

• Uploading to web platforms. Most content management systems impose image upload limits between 2 MB and 10 MB. A PNG at 300 DPI can exceed that limit on a single page. JPG at the same DPI will usually stay well within it.
• Sending as email attachments. Email servers commonly cap attachments at 10–25 MB. A multi-page PDF converted to PNG at 300 DPI can produce a ZIP archive that exceeds those limits. The same pages in JPG will be a fraction of that size.
• Storage and bandwidth costs. If you are hosting converted images on a server and paying for storage or CDN bandwidth, the format choice at scale adds up. Ten thousand page images in PNG at 300 DPI can occupy 50–150 GB. The same images in JPG would typically be 5–20 GB.
• When size does not matter. If you are converting one or two pages for personal use, archiving a legal document, or preparing images for print production, the size difference between formats is irrelevant. Choose PNG for the quality guarantee and move on.

If the resulting images will be shared or embedded on a website, compressing the images after conversion is a practical second step to bring file sizes down further without changing the format.

Colour Accuracy: Where JPG Falls Short

JPG compression is perceptually tuned — it discards colour information that human vision is least sensitive to, which is why photographs compress so well. For most photographic content the colour shifts are genuinely imperceptible. For certain categories of content, they are not.

PNG is lossless, so colours are exact. The pixel values in the output file are identical to the pixel values rendered from the PDF source. If a chart uses a specific brand red (#CC0000) and you convert it to PNG, the output will contain that exact value. This matters for:

• Logos and brand assets. Brand colour standards are often specified to exact hex values. A JPG of a logo will have subtle colour drift in solid-colour areas due to compression block boundaries. This is usually invisible at a glance but can be caught by colour-accurate design tools or print production workflows.
• Charts and data visualisations. A bar chart using five distinct colours to represent five data categories needs those colours to remain distinct and accurate. JPG compression can introduce subtle blending at the boundaries between differently coloured bars, making the chart harder to read at small sizes.
• Screenshots of UI or technical documentation. Interface colours are typically flat and precise. JPG compression introduces visible banding and colour noise in flat-colour areas — the kind of artefact that looks unprofessional in technical documentation.

When JPG colour accuracy is acceptable: for photographs of people, scenes, and objects, JPG's colour shifts are imperceptible because the source material itself has continuous natural variation. A portrait or landscape converted from PDF to JPG at 150 DPI or higher will look identical to the PNG version to any viewer who is not conducting a pixel-level comparison.

For a broader comparison of image format trade-offs — including the newer WebP and AVIF formats that offer alternatives to both JPG and PNG — see our guide to PNG vs WebP vs AVIF image format comparison. And for the underlying principles of why lossy and lossless compression produce different results, lossy vs lossless file conversion explained covers the mechanics in full.

OCR Considerations: Format Choice Affects Text Recognition Accuracy

If the reason you are converting a PDF to an image is to run optical character recognition on the output — extracting machine-readable text from a scanned document — the format you choose has a direct and measurable effect on the quality of the OCR result.

OCR engines read text by analysing pixel contrast at character edges. A sharp, clean edge between black text and a white background gives the engine a reliable signal. A blurred or artefact-affected edge forces the engine to guess, which is where errors accumulate.

PNG at 300 DPI is the recommended format for OCR input. Because PNG is lossless, every pixel in the output is an accurate representation of the rendered page. The edges of letters are precisely defined. OCR engines — whether you are using cloud-based services like Google Cloud Vision or local tools like Tesseract — produce their best results from lossless, high-resolution input.

JPG introduces compression artefacts specifically at high-contrast edges. The JPEG algorithm divides the image into 8×8 pixel blocks and applies discrete cosine transforms within each block. At the boundary between black text and a white background, this block-based processing creates a pattern of faint grey and off-white pixels around the character outline — the classic "JPG artefact" look when you zoom into compressed text. These artefacts are invisible at normal viewing sizes, but OCR engines process at the pixel level and can misread characters where the edge signal is corrupted.

The practical impact: on clean, well-printed text, the difference between JPG and PNG OCR accuracy is small — often less than one percentage point. On degraded source material (faxed documents, older photocopies, handwriting, small fonts below 10pt), the difference can be significant. A document that OCRs at 98% accuracy from a PNG source might OCR at 93–95% from a JPG source of the same page. At scale — processing hundreds of pages — those misread characters accumulate into a meaningful error burden.

DPI matters as much as format for OCR. 300 DPI is the established minimum for reliable OCR on standard printed text. 72 DPI or 96 DPI images, regardless of whether they are JPG or PNG, produce poor OCR results because individual characters are too small in pixel terms for the engine to resolve reliably. If OCR is your goal, do not compromise on DPI to save file size — the accuracy trade-off is not worth it.