Choose paper size and vertical or horizontal orientation
Select an A-series, B-series or US paper size, then choose vertical or horizontal. The preview and exported PDF immediately switch between vertical and horizontal page dimensions.
Exact-size print layout
Arrange images. Print the exact size.
Choose paper, add images, set their size and position, rotate in 90° steps, then save or print the PDF. Your files stay in this browser.
Free · No account · Local processingExact-size print layout
Choose the page first, then place one image or build a multi-image sheet.
Orientation
No files selected
Choose one or several PNG, JPEG, WebP or GIF files. Up to 20 images, 25 MB each. Animated GIFs use the first decoded frame.Images on this page
Selected imageNo image selected
When enabled, resizing keeps the selected image’s original pixel ratio.
You can also drag the image itself. Positions are measured from the selected paper’s top-left corner.
Selected image print sizeSelect an image to edit its size and position.
Source—
Effective—
Page use—
Add one or more images. They stay inside this browser tab.
A4 vertical layout
Add imagesStart here on mobile, then drag each image on the page.
Select an image, drag it to move, use the edge or corner handles to resize, and choose 0°, 90°, 180° or 270° rotation. The selected paper size, vertical or horizontal direction, image positions and layer order are reproduced in the PDF.
Function explained
What the tool actually creates.
A PDF in the paper size and vertical or horizontal orientation you select, with every image placed at its requested size, position and right-angle rotation.
The browser converts the selected paper dimensions and every image placement from millimetres into PDF points. Each image is rasterised at the chosen sampling value, rotated in an exact 90-degree step, and embedded at the position shown in the preview.
The page preview is proportional, not a calibrated on-screen ruler. Monitor density, browser zoom and operating-system scaling vary, so the downloadable PDF—not the apparent screen centimetres—carries the physical-size instructions.
The source file is not intentionally sent to an application server. Image decoding, resizing and PDF construction occur in the current browser tab. For a complete explanation, read the methodology and limitations.
How to use it
From image to measured print.
Add one image or several
Use the highest-resolution originals available. Multiple files can be added together or in separate batches.
Set exact size and rotation
Enter width and height in millimetres, centimetres or inches. Keep the ratio free or lock it to the rotated original ratio, then choose 0°, 90°, 180° or 270°.
Move, resize and layer
Drag images around the page, resize with the handles, enter precise left and top coordinates, and move overlapping images forward or backward.
Review effective PPI
Check the horizontal and vertical effective PPI for the selected image. Rotated images use the corresponding rotated source-pixel axes.
Create the PDF and print at 100%
Generate the PDF locally, select the matching paper size and vertical or horizontal orientation in the print dialog, and use Actual size, 100%, or No scaling.
Measure the first print
Use the optional 100 mm line to detect driver or application scaling before relying on important dimensions.
Practical tips
Avoid the common size traps.
Prefer the original file
Social apps often recompress images. A larger source gives the printer more real detail at the same physical size.
Do not confuse image PPI with printer DPI
Source pixels per printed inch describe image sampling. A printer's advertised dot resolution describes ink or toner placement and is not a one-to-one source-image requirement.
Watch non-printable margins
Many printers cannot place ink to the paper edge. The dashed 10 mm guide is conservative guidance, not a guarantee for every device.
Borderless mode may enlarge
Borderless printing commonly oversprays and may enlarge the page slightly so no white edge remains. That is useful for photos but harmful to exact scale.
Use PDF, then print at 100%
The PDF has the physical page size and orientation selected in the tool. Opening it in a proper PDF viewer and disabling scaling is more predictable than printing a standalone image from a gallery app.
Verify critical output physically
Software calculations cannot control paper feed, driver behaviour or hardware tolerance. A ruler test is the final check.
Related tools and original guides
Pixels and PPI → print sizeConvert a source pixel dimension into inches, centimetres and millimetres.Print size → required pixelsCalculate the source pixels needed for a requested size and sampling target.Exact-size printing checklistA detailed PDF and printer-dialog workflow for Windows and macOS.DPI, PPI and resolutionA practical explanation of the terms people mix together.A4 pixel dimensionsReference values from 72 to 600 PPI, with formulas and use cases.Why printers change sizeFit, shrink, margins, borderless expansion and driver behaviour.
Frequently asked questions
What to know before you print.
Does the image upload to a server?
No. The selected image is decoded with browser APIs and remains in the current browser tab. The site has no image-upload endpoint. Refreshing or closing the tab clears the working image.
Why does the preview not look physically correct on my screen?
A monitor is not a calibrated ruler. Browser zoom, operating-system scaling and display pixel density vary. The preview is proportional to the selected paper and the labels describe the intended printed dimensions.
Why is PDF the main download instead of PNG?
A PDF page carries explicit physical page dimensions and image placement coordinates. The tool can therefore reproduce the selected paper size, vertical or horizontal orientation and multi-image layout more predictably than a standalone bitmap.
Which print setting should I use?
Choose the same paper size and vertical or horizontal orientation used in the tool, then select Actual size, 100%, or No scaling. Disable Fit, Shrink oversized pages and borderless expansion unless you intentionally need them.
What is effective PPI?
Horizontal effective PPI is source pixel width divided by requested print width in inches; vertical effective PPI uses source pixel height and requested print height. With the aspect ratio locked, the two values normally match.
Is 300 PPI always required?
No. Around 300 PPI is a common target for close-viewed photo prints, but acceptable resolution depends on subject detail, viewing distance, paper, printer and personal tolerance. The tool reports the number instead of promising a universal quality threshold.
Can I print a passport or official ID photo with this?
You can place an image at a chosen physical size, but official photo rules also cover head size, background, framing, recency and other requirements. Verify the current rules of the issuing authority.
Why might the final print still be slightly wrong?
Printer drivers, non-printable margins, paper feed, borderless enlargement and application scaling can alter size. Use the optional 100 mm verification line and measure the first test print.
Which paper sizes are supported?
This release supports A3, A4, A5, JIS B4, JIS B5, ISO B4, ISO B5, Letter, Legal and Tabloid in vertical or horizontal layouts. Poster tiling and custom paper dimensions are not included yet.
Does Actual Size Lab guarantee engineering accuracy?
No. It is a practical print utility, not a calibrated metrology instrument. Do not use it as the sole method for medical, legal, manufacturing or safety-critical tolerances.
Transparency
Useful, but not a measuring instrument.
Actual Size Lab calculates an intended PDF placement. It cannot guarantee the physical behaviour of every printer, driver, paper path or borderless mode.
The formulas, assumptions, browser processing model and known limits are published on the methodology page. The project identity is explained on About, and contact, privacy and terms pages are available from every page.