Browser-based tiled poster printing
Upload an image, set the real finished size or page grid, preview every sheet, and download one assembly-ready PDF.
Your source image is never sent to GridMaker.
Sizing mode
Orientation
Image fit
4 × 4 · 60.0 × 90.0 cm
Upload an image or use the sample to preview the complete grid.
One image, many printable sheets
A block poster, tiled poster, or multi-page poster is one large image divided across ordinary sheets of paper. Instead of sending artwork to a large-format print shop, you print a numbered PDF on an A4, Letter, A3, Legal, Tabloid, B4, or B5 printer, trim selected edges, overlap the sheets, and assemble them into one continuous picture. GridMaker calculates the physical geometry before it draws a pixel, so page margins, overlap, orientation, and finished dimensions agree with the downloadable file.
The tool starts with the practical decision that matters most: choose a page grid when you know how many sheets you can use, or choose Exact size when the final poster must fit a wall, foam board, classroom display, prop, pattern, or presentation panel. Processing happens locally in the browser. The source image does not need an account, cloud upload, or server conversion queue.
Exact size preserves the requested width and height, including a partially used last row or column. It does not silently replace 60 × 90 cm with the nearest full-sheet rectangle. That distinction matters when the assembled poster must fit a measured surface.
Red crop marks, row-column labels, and blue overlap guides can be switched independently. A first-page assembly map helps prevent rotated, swapped, or misaligned sheets.
The live poster thumbnail shows the whole composition and tile order, while Print page view shows margins, unused space, marks, and overlap on one selected sheet. Open either preview at a larger size when small details need inspection.
Cropping, image placement, page rendering, and PDF creation run inside your browser. This is useful for client work, family photographs, classroom material, unpublished art, signage, and other images that should not enter a remote processing pipeline.
Paper sizes available in the PDF generator
Select the sheet that matches the printer tray, then choose portrait or landscape. Margins are subtracted on all four sides before the page grid is calculated. Custom paper accepts either edge from 100 to 500 mm and is useful for photo paper, plotter offcuts, craft media, and unusual printer drivers.
| Paper | Millimeters | Inches | Common use |
|---|---|---|---|
| A5 | 148 × 210 mm | 5.83 × 8.27 in | Small proofs, handouts, mini posters |
| A4 | 210 × 297 mm | 8.27 × 11.69 in | Most home and office printers |
| A3 | 297 × 420 mm | 11.69 × 16.54 in | Larger desktop and studio printers |
| B5 | 176 × 250 mm | 6.93 × 9.84 in | Books, notebooks, compact displays |
| B4 | 250 × 353 mm | 9.84 × 13.90 in | Posters, diagrams, school material |
| US Letter | 215.9 × 279.4 mm | 8.5 × 11 in | North American home printing |
| US Legal | 215.9 × 355.6 mm | 8.5 × 14 in | Tall layouts and long diagrams |
| Tabloid / Ledger | 279.4 × 431.8 mm | 11 × 17 in | Wide office printers and signage |
| Custom | 100–500 mm per edge | 3.94–19.69 in | Photo stock and nonstandard media |
These standard dimensions help translate a desired poster into available sheets. A0, A1, A2, and B0–B3 may be larger than a home printer can feed, but they are useful finished-poster targets. Enter their dimensions in Exact size and GridMaker determines how many smaller printable pages are required.
The A series keeps the same 1:√2 proportion when folded or cut in half. A4 is the common office sheet; A3 is two A4 sheets; A2, A1, and A0 are useful poster targets.
| Paper | Millimeters | Inches | Common use |
|---|---|---|---|
| A0 | 841 × 1189 mm | 33.11 × 46.81 in | Exhibitions and full display posters |
| A1 | 594 × 841 mm | 23.39 × 33.11 in | Large signs and presentation boards |
| A2 | 420 × 594 mm | 16.54 × 23.39 in | Medium posters and diagrams |
| A3 | 297 × 420 mm | 11.69 × 16.54 in | Small posters and artwork |
| A4 | 210 × 297 mm | 8.27 × 11.69 in | Documents and home printing |
| A5 | 148 × 210 mm | 5.83 × 8.27 in | Flyers and compact handouts |
| A6 | 105 × 148 mm | 4.13 × 5.83 in | Postcards and mini prints |
B sizes sit between neighboring A sizes and provide useful intermediate formats for books, graphics, technical material, and posters.
| Paper | Millimeters | Inches | Common use |
|---|---|---|---|
| B0 | 1000 × 1414 mm | 39.37 × 55.67 in | Oversize displays and maps |
| B1 | 707 × 1000 mm | 27.83 × 39.37 in | Large poster targets |
| B2 | 500 × 707 mm | 19.69 × 27.83 in | Gallery and retail posters |
| B3 | 353 × 500 mm | 13.90 × 19.69 in | Diagrams and medium posters |
| B4 | 250 × 353 mm | 9.84 × 13.90 in | Charts and school material |
| B5 | 176 × 250 mm | 6.93 × 9.84 in | Books and compact prints |
Letter, Legal, and Tabloid are common in the United States and Canada. Ledger uses the same 11 × 17 inch sheet as Tabloid, rotated to landscape.
| Paper | Millimeters | Inches | Common use |
|---|---|---|---|
| Letter | 215.9 × 279.4 mm | 8.5 × 11 in | General home and office output |
| Legal | 215.9 × 355.6 mm | 8.5 × 14 in | Tall documents and timelines |
| Tabloid | 279.4 × 431.8 mm | 11 × 17 in | Posters, plans, and spreads |
Pages mode vs Exact size
Pages mode is best when paper consumption is fixed. Set the width in sheets, leave height on Auto to preserve the cropped image proportion, or choose a row count. Fit keeps the complete crop and may leave blank bands. Fill covers the finished rectangle and may remove content at the outer edges.
Exact size is best when the wall or mounting board is fixed. Enter centimeters or inches and the calculator finds the grid. A final row or column may use only part of its printable area because preserving the requested dimension matters more than consuming every sheet completely.
Margins and overlap
Margin is the unprinted border between the paper edge and poster. Use at least the printer’s non-printable minimum; 10 mm is a reliable starting point. A larger margin can increase page count but gives tape and handling more room.
Overlap is repeated image area shared with the page above or left. Zero uses less paper but requires edge-to-edge alignment. Five to ten millimeters is easier to register. Blue guides mark the repeated strip and can be switched off independently; red marks identify the cut. Test one pair before trimming everything.
DPI and source quality
Draft 72 DPI renders quickly for layout checks. Standard 150 DPI balances quality and file size for wall viewing. High 300 DPI helps with close viewing, text, line art, and small sheets, but cannot restore missing source detail. Source quality compares cropped pixels with physical placement.
If source DPI is low, reduce the finished size, choose Fit so fewer pixels are cropped, or use a larger original. A 300 DPI setting cannot invent texture in a compressed screenshot. For large posters, readable composition often matters more than arm’s-length pixel detail.
Printing and assembly
Print the calibration PDF at Actual size or 100% and measure both rulers. Correct the printer before using expensive paper. Disable Fit to page, Shrink, borderless enlargement, and driver scaling. Confirm paper and orientation match the PDF.
Use row-column labels when enabled; otherwise match sheets to the overview and neighboring image content. Trim overlap edges and dry-fit the center before adding adhesive. Removable tape suits temporary displays; spray mount gives a flatter permanent result. Secure outward from the center to limit accumulated error.
Four-step workflow
The controls stay above the reference content so the main job can be completed immediately. Use the details below only when paper, scale, or assembly needs a deliberate decision.
Upload JPG, PNG, or WebP, or use the sample. Open Crop image to remove unwanted edges before the page grid and source DPI are calculated.
Choose page count or exact dimensions, paper, orientation, margin, and overlap. Watch finished size and PDF page count update together.
Check the whole-poster composition, then move through individual pages to inspect blank areas, repeated strips, crop marks, and labels.
Choose 72, 150, or 300 DPI, include the assembly overview if useful, download the PDF, and print at Actual size or 100%.
A block poster is one large image printed on a grid of smaller sheets, then trimmed, overlapped, and joined. It is also called a tiled, multi-page, raster, or printer-paper wall poster.
Yes. The entered width and height define the finished boundary. A final row or column may contain unused white paper instead of rounding the poster up to a complete sheet.
Fit keeps the complete crop and may add blank bands when proportions differ. Fill covers the entire poster and may remove image content at the outer edges.
Five to ten millimeters works for most home printing. Use more when alignment is difficult. Use zero only for accurate borderless output or carefully trimmed edge-to-edge joins.
Standard 150 DPI suits many posters at normal wall distance. Use 72 for a proof and 300 for close-viewed detail, small text, or line art. Higher DPI increases time and file size.
No. The browser reads the file, draws previews, renders sheets, and creates the PDF locally. Normal analytics may record a page visit without receiving the source image.
The print dialog probably scaled it. Select Actual size or 100%, disable Fit and Shrink, verify the paper, and print the calibration page. Some drivers add borderless enlargement.
Yes. Enter a reference-table size in Exact mode and print it on supported smaller sheets. B4 and B5 are direct outputs; larger A and B sizes work as finished targets.
