Image Splitter
This image splitter cuts a picture into equal pieces by columns and rows, into tiles of a fixed pixel size, or into a large poster printed across several Letter, A4 or A3 sheets. Download the parts one by one, as a ZIP or as a print-ready PDF – the image never leaves your device.
Source: ISO 216:2007 – Writing paper and certain classes of printed matter – Trimmed sizes – A and B series (A4 = 210 × 297 mm, A3 = 297 × 420 mm). Updated: .
How it is calculated
Three ways to split an image
- Equal parts: set columns and rows – 2 × 1 splits an image in half, 3 × 1 gives three strips, 2 × 2 four quarters, 3 × 3 nine parts. Borders fall on whole pixels, so the parts add up to the original exactly, with no gap and no duplicated pixels.
- Fixed tile size: for example 512 × 512 px for textures, map tiles or sprite sheets. If a remainder is left at the right or bottom edge, the last tile is narrower.
- Poster: the image is spread over several Letter, A4 or A3 sheets. You choose how many pages go across; the number of rows follows from the image’s aspect ratio. The result is a PDF with one page per part, crop marks and grid labels A1, A2, B1 … like on a street map.
How to print a large image on multiple pages
- Choose “Poster”, set the paper size and orientation and enter the pages across. The preview shows the poster size and print resolution.
- Create the PDF and print it at actual size (100%, not “fit to page”), otherwise the pieces will not line up.
- Trim the sheets at the crop marks. With a glue strip, every sheet from column 2 or row 2 on repeats the neighbour’s edge on its left or top side; a dashed line marks it. Cut along the line and glue the sheet over its neighbour – no white seams.
The page margin is 10 mm (about 0.4 in) because most printers cannot print to the edge. US Letter is 8.5 × 11 in; A4 is 210 × 297 mm and A3 297 × 420 mm under ISO 216.
What resolution is enough for printing?
The tool calculates how many image pixels land on one inch of paper. A 3,000-pixel-wide image on a 57 cm (22.4 in) wide poster gives about 134 dpi. The bigger the poster, the fewer pixels per inch and the more visible the pixels up close. For a wall poster viewed from a few steps away this matters less than for a photo held in your hand.
Privacy and limits
Splitting happens in your browser using canvas graphics; nothing is uploaded. Up to 400 parts are possible; very large images are reduced to the browser’s canvas limit (about 16.7 megapixels on iPhone and iPad). Animated GIFs are split as a still image. To split a picture for your profile grid, use the Instagram grid maker; to keep just one part, crop the image, and to combine several pictures, try the photo collage maker.
Frequently asked questions
How do I split an image into 4 equal parts?
Choose “Equal parts” and enter 2 columns × 2 rows. For four strips side by side use 4 × 1, for four stacked strips 1 × 4.
How do I print a picture on multiple pages?
Choose “Poster across several pages”, select Letter or A4 and the number of pages across, create the PDF and print it at actual size (100%). Then trim at the crop marks and tape the sheets together in the order A1, A2 …
How do I split an image in half?
Use 2 columns × 1 row to cut it vertically into a left and right half, or 1 column × 2 rows for a top and bottom half.
What is the overlap for?
Neighbouring sheets show the same strip of the image. You trim it off one sheet and glue the other on top, which hides small printer inaccuracies and avoids gaps.
Does splitting reduce the image quality?
Not with PNG: the parts contain exactly the original pixels. JPG and WebP are saved again at high quality (92%); “same as original” picks JPG for photos and PNG otherwise.
Is my image uploaded?
No. Loading, splitting and creating the PDF happen entirely in your browser.
Sources and legal basis
- ISO 216:2007 – Writing paper and certain classes of printed matter – Trimmed sizes – A and B series (A4 = 210 × 297 mm, A3 = 297 × 420 mm)
- MDN – CanvasRenderingContext2D.drawImage() (Bildausschnitt kopieren)
- PKWARE – APPNOTE.TXT (ZIP File Format Specification)
- ITU-T T.81 / ISO/IEC 10918-1 – JPEG
- W3C – Portable Network Graphics (PNG) Specification
- Google for Developers – An image format for the Web (WebP)
- AOMedia – AV1 Image File Format (AVIF)
- MDN – Image file type and format guide
- MDN – HTMLCanvasElement.toBlob()
- Open-source licenses of the libraries used (MIT, LGPL-3.0)
As of: · Editorial policy
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