Split an image for printing: complete tutorial

By Sebastian Sajoux · Updated July 2026

Follow the five steps below and in about two minutes you'll have a multi-page PDF that prints your image at poster size on whatever printer you own. Every step names the exact control to click, with a screenshot of what you should be seeing.

Step 1 — Upload your file

1. Open Free Image Splitter.
2. Drag your file onto the box labeled "Drop your image or PDF here" — or click "Choose file" and pick it from disk.

JPG, PNG, WEBP, GIF, BMP, and PDF all work. If you drop a multi-page PDF, a page picker appears; select the page you want to split. The file loads in a second or two regardless of size, because nothing uploads — the entire split happens inside your browser tab.

Step 2 — Choose your grid

The top of the panel is "Set the size by". It offers four ways to define the same grid — pick whichever matches what's in your head:

• Pages across — you're thinking in sheets of paper. Set it to 2 and a normal photo becomes a four-page poster.
• Pages down — the same control for tall images like phone screenshots.
• Width — you're thinking in inches. Type 24 and the tool computes how many pages that takes.
• Height — inches again, driven from the vertical side.

Whichever driver you set, the other three update to match. Then work down the panel:

3. Set the paper size. Letter is the default; A4, A3, Tabloid, Legal, and seven other sizes are in the same dropdown.
4. Pick portrait or landscape — landscape usually means fewer pages for wide images.
5. Leave the quality preset at 200 DPI unless you have a reason to change it. The presets go 150 / 200 / 300, and none of them ever throws away detail: if your source has less resolution than the preset asks for, the export simply carries everything the source has.

Step 3 — Read the preview

The right side of the workspace is labeled "Preview — Each tile is one printed page." Take it literally: every tile is one sheet, and the captions (Page 1, Page 2…) run left to right, top to bottom — the same order the pages come out of your printer.

Above the preview sits the readout, the one line worth reading before you print anything. Mine says: "4 pages · 2 × 2 / 16 × 20 in (1.3 × 1.7 ft) / ≈ 150 DPI · Good at a distance." Left to right, that's the sheet count, the grid shape, the assembled size, and the effective resolution with a verdict. The colored dot next to the DPI is a traffic light: green means 200 DPI or better (sharp up close), amber means 100–199 (good from a few feet), red means under 100 (will print blocky).

Now tune. Change "Pages across" and watch the readout move — bigger grids grow the print but drop the DPI. Stop when the size is right and the dot isn't red. If you can't get out of the red at the size you want, the site's upscaler (2× or 4×) can help before you split; there's more on that in the enlarging guide.

Step 4 — Margins and overlap

6. Leave the margin at 0.25 in. You can set anything from 0 to 1 in, but 0 only makes sense on a printer that genuinely does borderless.
7. Set the overlap to 0.25–0.5 in if this is your first poster, or any time you plan to glue the seams. Leave it at 0 if you'll butt-join cleanly cut edges with a paper trimmer.

Overlap is cheap insurance. The repeated strip means a cut that drifts a millimeter or two still lands on image, not on white paper, and the printed dashed line tells you exactly where to run the blade. The tool goes up to 2 in of overlap, but past half an inch you're just printing the same pixels twice.

Step 5 — Export and print

8. Click "Download PDF". You get one file with one page per tile, generated on the spot.
9. Open it and print with scaling set to "Actual size" or 100% — never "Fit to page," which shrinks every tile and ruins the alignment.
10. Print page 1 by itself first. If it looks right and measures right, print the rest.

Prefer individual images over a PDF? The export also offers a ZIP of PNGs, one per tile — handy if you print from an image editor or send pages to different printers.

After printing

Assembly is its own craft: which edges to trim, why tape goes on the back of the seam, when foam board is worth $3. All of that lives in the full large-image printing guide, along with a table showing how large your source file can realistically go. This page's job is done once the PDF is on your disk.

Where this tutorial hands off