Check Effective Horizontal PPI Before a Print Export — Free
A file’s pixel count becomes a different density at every print width. Divide the source pixels by the intended width and find assets that fall below the print threshold you set for this job.
The proof surface
A photo archive fill calculator estimates stored bytes against a drive. This ruler checks the horizontal sampling density of one image at a chosen physical print width; it does not estimate storage or judge image quality.
Why the flat version breaks
Using megapixels as a width
Total image megapixels do not identify the cropped horizontal pixel count.
Forgetting the crop
A tight crop can lower the available pixels even if the camera original was large.
Calling the threshold a universal quality rule
The chosen PPI is a workflow setting, not a guarantee of perceived sharpness.
How to work the print-density ruler
Read the pixel dimension after the crop you will actually export. Cropping can remove pixels before the print size is applied.
Use inches for this instrument. The formula is source horizontal pixels divided by printed inches.
Different viewing distances, printers, substrates and images tolerate different densities. Enter the figure from your print provider or production brief; the example is illustrative.
This only measures horizontal PPI. A different aspect ratio, resampling, sharpening or source blur can change the result; inspect a proof at the intended viewing distance.
What the print-density ruler replaces
| Question | Before | Visible working |
|---|---|---|
| Using megapixels as a width | Total image megapixels do not identify the cropped horizontal pixel count. | Enter the physical print width |
| Forgetting the crop | A tight crop can lower the available pixels even if the camera original was large. | Set a threshold for the process |
| Calling the threshold a universal quality rule | The chosen PPI is a workflow setting, not a guarantee of perceived sharpness. | Check the other axis and a proof |
A local arithmetic aid replaces hand calculation, not expert review. No paid AI service is needed.
Run it on the samples, right here
FIRST-LOAD
Input is processed locally and a draft is saved automatically in this browser profile when storage is available. Reset to sample clears that draft; Pro history has its own clear button. A state link encodes your inputs in its URL: share only non-sensitive rows. Browser history, clipboard and anyone receiving the link may retain it. Optional AI use below leaves this device; it is not required.
Pixel-density arithmetic only. It is not a print-provider specification, colour proof, copyright review or image-quality guarantee. Confirm export settings with your printer and inspect a physical proof before a critical run.
Data note: Everything runs in this browser tab on the print-density ruler: your asset | horizontal pixels | printed width inches stays on this device, nothing is uploaded, and the reading is rebuilt only when you press run.
Go deeper: the companion app files the same reading as a bound register page
The article demo above runs without limits. The companion app keeps a local history, exports the rows as CSV, prints the print-density ruler reading, and holds your drafts on this device — one free run, then $ 4 one-time for the layer that keeps filing.
The print-density ruler reading is complete for free. The optional $4 layer adds print, row CSV and the last five local reading summaries; it does not add hidden answers. Checkout is not configured yet; the article demo remains unlimited.
Open the check effective horizontal ppi before a print export companionBoundary
Pixel-density arithmetic only. It is not a print-provider specification, colour proof, copyright review or image-quality guarantee. Confirm export settings with your printer and inspect a physical proof before a critical run.
What this is built on
- Method: the equation is stated next to the result and uses only quantities entered by the reader.
- All sample records are invented examples. No standard, tariff, product rate, schedule or policy is fetched or represented as verified.
- For any threshold or rule, use the current value from the provider, handbook or qualified professional responsible for it.
Before: Total image megapixels do not identify the cropped horizontal pixel count. After: the print-density ruler shows the working beside each named row so the reader can change the assumption and inspect the consequence.
Optional AI formatting, not calculation
For this print-density ruler, an external AI text tool may help format non-sensitive notes if you already use one. No AI service or account is required: manual entry completes the same free core calculation. Do not paste private or sensitive data. Review every value against the source before using it.
Format my non-sensitive notes for a print-density ruler. Return plain rows only: asset | horizontal pixels | printed width inches. Preserve supplied quantities exactly. Do not guess missing values; list questions separately. Do not calculate or add advice. I will check every row before pasting into the local tool.
Accepted schema: asset | horizontal pixels | printed width inches. No AI response is executed as code.
Walk three labelled examples
First reading. The invented sample Market poster | 3600 | 18 uses minimum horizontal pixels per inch = 240. The displayed lowest effective ppi is 200.00000 pixels per inch. Follow the row note back to the measurements and conversion rather than treating the headline number as a recommendation. The sample is deliberately concrete so the reader can reproduce the arithmetic by hand.
Changed assumption. The alternate input Small card | 6000 | 20 produces 300.00000 pixels per inch for the displayed summary. Compare it with the first reading to see which entered quantity moves the result. In a real plan, change only the assumption that has a traceable source; do not tune a value just to make a row pass.
Boundary case. With Exact threshold | 4800 | 20 and the same setting, the worked result is 240.00000 pixels per inch. This case shows how the arithmetic behaves at a useful edge, not that the underlying process has been measured or verified. Check the boundary statement beside the result and confirm any consequential input with the responsible person before acting.