Print Preflight
Verify that all images in a PDF meet the 300 DPI threshold before sending to a commercial or fine-art print vendor.
PDF Analyser
Check PDF DPI and Resolution Before Printing or Compressing
Upload any PDF and instantly check the DPI and PPI of every embedded image across all pages. Get per-image results including pixel dimensions, DPI X, DPI Y, color space, and an average image DPI — no Acrobat required.
PDF Image DPI Thresholds at a Glance
Common DPI benchmarks used by print shops, publishers, and web workflows.
| DPI Range | Typical Use Case | Print-Ready? |
|---|---|---|
| 72 – 96 DPI | Screen display, web, email | No |
| 150 – 199 DPI | Low-quality draft prints | Marginal |
| 200 – 299 DPI | Newspapers, internal docs | Sometimes |
| 300 DPI | Standard commercial print | Yes |
| 400 – 600 DPI | Fine art, photo books, scanning | Yes — archival |
| 1200+ DPI | Line art, vector-rasterised output | Yes — specialist |
300 DPI is the widely accepted minimum for professional offset and digital print. Always confirm requirements with your print vendor.
What the DPI Checker Actually Analyses
When you upload a PDF, the analyser iterates through every embedded image object across all pages. For each image it calculates DPI X and DPI Y from the stored pixel dimensions and the rendered size on the page. It also reads color space (RGB, CMYK, Grayscale) and compression method where available.
The results include: page number, image index, pixel width, pixel height, DPI X, DPI Y, color space, compression, and an average image DPI across the whole document. This gives you a complete picture of where low-resolution assets are hiding — even on pages that look fine at 100% zoom.
A PDF can have different DPI values on different pages. The per-page breakdown lets you identify exactly which pages need attention.
Common Reasons to Check PDF Resolution
- Print shop rejected your filePrepress teams flag PDFs with images below 300 DPI. Check before you submit to avoid reprint fees and delays.
- Scanned document quality auditConfirm whether a scanned PDF was captured at 300, 400, or 600 DPI before archiving or distributing it.
- PDF looks sharp on screen but prints blurryScreen rendering upscales low-resolution images. Actual DPI values reveal the true print quality hidden by zoom.
- Pre-compression quality baselineRecord current image DPI before running compression so you can verify that critical pages weren't degraded.
- Publisher or magazine submission checkEditorial and photo-book publishers specify minimum PPI. Verify every page meets the brief before sending.
What Is PDF DPI and Why Does It Matter?
DPI (dots per inch) and PPI (pixels per inch) describe how many image pixels are packed into each inch of a printed or displayed page. When a PDF contains embedded images at too low a resolution — typically below 150 DPI — those images will appear blurry or pixelated when printed, even if the file looks sharp on screen.
Professional print vendors usually require at least 300 DPI for sharp offset or digital print. Prepress teams reject files that fail this threshold, causing costly delays. Checking your PDF's embedded image DPI before submission lets you catch low-resolution pages early and decide whether to reprocess the source file.
This tool reads the raw PDF image objects and calculates effective DPI from pixel dimensions and placement data — the same information a preflight tool would surface, available free online without installing anything.
This tool checks embedded image DPI only. It does not change, repair, compress, or extract images from your PDF.
Perfect for Print Workflows
- Check Before PrintingAvoid costly reprint mistakes by verifying your document is at least 300 DPI before sending it to the presses.
- Audit Scanned DocumentsEnsure your digital archives and scanned paperwork meet the required resolution for compliance and legibility.
API Response Fields Explained
Fields returned by the PDF DPI Checker endpoint for each analysed image.
| Field | Type | Description |
|---|---|---|
| page_count | integer | Total number of pages in the uploaded PDF |
| images[].page | integer | Page number where the image appears (1-indexed) |
| images[].index | integer | Image index on that page |
| images[].width_px | integer | Image width in pixels |
| images[].height_px | integer | Image height in pixels |
| images[].dpi_x | number | Horizontal resolution in dots per inch |
| images[].dpi_y | number | Vertical resolution in dots per inch |
| images[].color_space | string | Color space (e.g. RGB, CMYK, Grayscale) |
| images[].compression | string | Compression type when available (e.g. JPEG, CCITT) |
| average_image_dpi | number | Mean DPI across all embedded images in the document |
| processing_time_ms | integer | Server-side processing time in milliseconds |
The compression and color_space fields are returned when the PDF metadata includes them. Not all PDFs expose these values.
Practical Use Cases
Real-world workflows where this tool shines.
Scanned Document Audit
Confirm scan resolution on archival or compliance documents before long-term storage or distribution.
Pre-Compression Baseline
Record current image DPI values before running PDF compression so you can detect any resolution loss introduced by the process.
Publisher Submission Check
Ensure every page of a photo book, magazine layout, or editorial PDF meets the publisher's minimum PPI specification.
Who This Is For
The people and teams this tool is especially useful for.
Graphic Designers
Verify exported PDFs meet print-ready DPI standards before sending files to a print bureau or client.
Prepress Technicians
Run a fast resolution check on incoming PDFs to flag low-quality image pages before they reach the press.
Document Archivists
Audit scanned PDFs to confirm they were captured at the required 300–600 DPI before adding them to an archive.
Developers and DevOps
Integrate PDF DPI checking into automated pipelines to validate document quality before storage, distribution, or conversion.
How to Check PDF DPI Online
Analyse every embedded image in your PDF in three steps — no software installation and no Acrobat licence required.
01
Upload Your PDF
Select a PDF file up to 20 MB. The tool validates the upload and supports documents with up to 5000 pages.
02
Analyse Embedded Images
The checker reads every image object inside the PDF and calculates effective DPI and PPI from pixel dimensions and page placement data.
03
Review Per-Page Resolution Results
Inspect page number, image index, width, height, DPI X, DPI Y, color space, compression, and average image DPI for the full document.
04
Plan Your Next Step
Use the findings to confirm print readiness, flag low-resolution pages for reprocessing, or pass the data into a PDF DPI changer workflow.
Why Use a Dedicated PDF DPI Checker?
Get accurate per-page resolution data before your PDF goes to a print shop, publisher, or compression pipeline.
Per-Page DPI Breakdown
See DPI X, DPI Y, pixel dimensions, color space, and compression for every embedded image — not just a single document-wide average.
Catch Low-Resolution Pages Before Print
Identify pages where embedded images fall below 300 DPI before your file reaches the print shop, avoiding costly reprints and submission rejections.
No Acrobat or Software Required
Check PDF resolution directly in your browser. No Adobe licence, no desktop install, and no plugin needed.
Supports Large Multi-Page PDFs
Analyse documents up to 20 MB and 5000 pages. Suitable for brochures, catalogues, reports, and scanned archive files.
Color Space Visibility
Each image result includes its color space — RGB, CMYK, or Grayscale — helping prepress teams verify color mode alongside resolution.
Average Image DPI Summary
Get a document-wide average image DPI alongside per-image data, giving you a fast headline figure for quick quality assessments.
PDF DPI Checker — Frequently Asked Questions
Answers to the most common questions about checking PDF image resolution and PPI online.
Upload your PDF to this tool. It reads each embedded image object and calculates DPI X and DPI Y from the pixel dimensions and the rendered placement on the page. Results are shown per image, per page, with an average DPI for the whole document.
Run the PDF through this checker and look at the DPI X and DPI Y columns for each image. If all images report 300 DPI or higher, the document meets the standard commercial print threshold. Any image below 300 DPI on a print-critical page should be replaced with a higher-resolution source.
Yes. A PDF is a container — each embedded image stores its own resolution data independently. A cover page might hold a 72 DPI screen-exported photo while interior pages contain 300 DPI scans. This tool shows per-page, per-image DPI so you can identify exactly which pages have resolution problems.
Screen rendering interpolates and upscales images to fill display pixels, masking low resolution. A 96 DPI image can look clean at 100% zoom on a monitor but will print at noticeably reduced quality. Checking the actual embedded DPI reveals the real print quality rather than the screen approximation.
This tool does exactly that. Upload your PDF (up to 20 MB, up to 5000 pages) and it returns per-image PPI and DPI data directly in your browser — no Adobe Acrobat licence or desktop software required.
No. This is a read-only analyser. It inspects and reports embedded image resolution data but does not modify, compress, or reprocess your PDF in any way. If you need to change DPI, use a dedicated PDF DPI changer after reviewing the results here.
The PDF DPI Checker accepts files up to 20 MB and supports documents up to 5000 pages. Files larger than 20 MB should be split before uploading.
Each image result includes page number, image index, pixel width, pixel height, DPI X, DPI Y, color space (RGB, CMYK, or Grayscale), and compression method when available. A document-level average image DPI and processing time are also returned.
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