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To turn PDF pages into images, select a PDF in ToolKnit PDF to Image, choose PNG, JPG or WebP, set the DPI and convert the pages you need. Download them individually or as ZIP files. To make a long image or contact sheet, finish the selected pages first, then choose an arrangement below the results. Your document is processed locally.
Choose PNG, JPG or WebP for the actual content
| Format | Useful starting point | Tradeoff |
|---|---|---|
| PNG | Text, diagrams, screenshots and transparency | Avoids lossy encoding of the rendered pixels, but photographic pages can be large. |
| JPG | Photo-heavy pages and ordinary image sharing | Quality control can reduce size. Fine text may show artifacts; the background is opaque. |
| WebP | Web publishing with adjustable quality | Can preserve transparency in supported browsers. Verify the receiving platform accepts WebP. |
The quality slider affects JPG and WebP, not PNG. Avoid repeatedly converting a JPG back into another JPG when text edges matter. The combined-image step decodes existing page images and encodes a new image, so JPG/WebP composition introduces another encoding step. PNG is a useful choice when you want to avoid additional lossy encoding.
This converter renders whole pages. It does not extract original embedded photographs byte for byte, preserve PDF text selection or carry document links into the output picture. For editable native text, use PDF to Word; scanned-page OCR is currently unavailable there.
Choose DPI using pixel dimensions, not a quality slogan
Rendered pixels ≈ physical page size in inches × DPI. An A4 page is about 8.27 × 11.69 inches. At 150 DPI it is roughly 1241 × 1754 pixels; at 300 DPI it is roughly 2481 × 3508. Actual rounding depends on the PDF page box, rotation and renderer. The tool's preview shows the dimensions it will use.
| DPI | Good first experiment | Watch for |
|---|---|---|
| 72 | Small screen previews and checking page order | Small text may be difficult to read. |
| 150 | Document sharing and most screen viewing | Check the exported image at the size it will be displayed. |
| 300 | Fine source detail or print preparation | About four times the pixels of 150 DPI. |
| Custom 36–600 | Matching a specific pixel budget | Large pages can exceed canvas or memory limits. |
Increasing DPI does not recover letters blurred in the original scan. A photo of a page remains limited by that photo's detail. Start with a few representative pages before converting a large file at high DPI. The input-file size alone does not predict rendering memory.
Make vertical long images, horizontal strips or contact sheets
- Choose a range, odd/even pages or visual selection. Convert the required pages and retry failures first.
- Find Combine your converted pages beneath the results.
- Choose Vertical long image, Horizontal long image or Contact sheet.
- Set a gap from 0 to 80 pixels. Read the proposed file count and output dimensions before preparing the images.
- Download each result. When there are multiple groups, a combined ZIP is available too.
Long-image mode accepts 2–20 completed pages. Each output holds at most 5 pages and must fit the side and pixel limits, so a large selection can become several numbered images. Grid mode requires exactly 4 or 9 pages, arranged left to right and then top to bottom. Mixed page sizes are centered; they are not enlarged or shrunk to fill their cells.
All three arrangements preserve the pixels of the already-rendered pages. A different DPI setting does not retroactively change old outputs: convert again before combining when you want a new resolution or background. The arrangement preview is a lightweight overview of the first group; downloads contain the full stated dimensions.
A nine-page example you can reproduce
Download the original nine-page practice PDF. It contains numbered pages and colored rectangles, with no personal or customer information. Each source page is 360 × 480 PDF points. Select PNG, 72 DPI and all nine pages.
| Arrangement | Gap | Expected dimensions for this sample |
|---|---|---|
| Individual pages | Not applicable | Nine images, each 360 × 480 px |
| Vertical | 0 px | 360 × 2400 px for pages 1–5; 360 × 1920 px for pages 6–9 |
| Horizontal | 12 px | 1848 × 480 px for pages 1–5; 1476 × 480 px for pages 6–9 |
| 9-page contact sheet | 12 px | 1104 × 1464 px, pages 1–9 in row order |
| 4-page contact sheet | 12 px | Select pages 1–4 and reconvert: 732 × 972 px |
This is a controlled geometry example, not a promise that every PDF has the same page size. Compare the page numbers and rectangle colors after download. Zero-gap long images join page boundaries, but white margins already inside the PDF remain; the tool does not automatically crop them.
Transparent backgrounds have a specific meaning
Choose Transparent before converting to PNG or WebP. Unpainted page areas can then remain transparent. A white rectangle, a scanned sheet of paper or a background photograph is actual PDF content, so it remains visible. Transparency does not remove those backgrounds. JPG is opaque, and combined-image gaps follow the background used for the original page conversion.
Recover from large files or interrupted conversion
PDF input is limited to 256 MiB on desktop or 128 MiB on phones and low-memory devices. Pages render sequentially, so cumulative rendering work is not treated as simultaneous memory. A page is limited to 16,384 pixels per side and 40 million pixels on desktop, or 16 million pixels on smaller devices. Retained images have a 384 / 160 MiB budget. Save completed downloads, then explicitly release their browser copies to continue pending pages. Compositions keep their separate geometry limits.
- Too large before conversion: reduce DPI or select fewer pages.
- Cancelled halfway: save completed images or use the remaining-page control. Combining requires all selected pages to finish.
- A particular page fails: retry it; if necessary, lower DPI and review the resulting page sizes before combining.
- A contact sheet is too large: use fewer pages or reconvert at lower DPI. Nine A4 pages at high DPI can exceed a single canvas.
- A ZIP download is blocked: use the individual numbered download buttons. The tool can split large page-image ZIP jobs into parts.
Keep the source PDF until you have opened the downloads and checked resolution, order and completeness. Resetting or closing the page clears the working results. A successful conversion message is a cue to save and inspect the files, not proof that an external platform will accept their dimensions.
Choose the next tool only when needed
For custom arrangements beyond these page groups, use Image Stitcher. If a receiving site imposes a file-size cap, try Compress Image after checking legibility. Reducing dimensions can also help, but creates a different image from the original rendered pixels.
Open PDF to Image and start with the practice file. Use the arrangement that fits the reading task: a long image for sequential viewing, a grid for an overview, or separate pages when each page needs to stay readable on its own.