Long Image Splitter

Why listing images have to be split

Marketplace listing pages are usually designed as one very tall image, then uploaded as several shorter ones because the platform caps how tall a single image can be. Cutting that by hand in an image editor means measuring, cropping and exporting each piece one at a time, and redoing all of it whenever the design changes.

This tool takes the finished tall image and produces the pieces in one step, numbered in order so they upload in the right sequence.

Three ways to choose the cuts

Fixed height gives every part the same height, with the last one shorter if it does not divide evenly. Use this when the platform has a specific pixel limit.

Equal parts divides the image into however many pieces you ask for. Use this when the count matters more than the exact height.

Smart looks at the image itself. It scores every row by how flat and uniform it is, then moves each cut to the quietest row nearby — in practice, the background gap between two sections. This is what stops a cut landing halfway through a line of text or a product photo.

Very tall images

Browsers cap how large a single canvas can be, and going over it produces a blank image rather than an error. The cap depends on the device's memory rather than the browser: on a desktop it is high enough that you are unlikely to meet it, while phones and tablets are far more restricted. This tool sidesteps the question by never drawing the full image at once — each piece is rendered on its own small canvas, so height is not a limit here regardless of the device.

How to use it

1. Drop your tall image onto the box above, or click it to pick a file.
2. Choose how to split: a fixed height in pixels, a number of equal parts, or smart mode.
3. Check the previews. Change any option and everything re-splits immediately.
4. Download the parts individually, or all of them as a numbered ZIP.

Usable on a work computer

Plenty of workplaces block file uploads to outside websites, to keep contracts and customer records from leaving the building. On those machines the usual online converters simply fail.

This one has no upload to block. Whether your organisation permits a particular site is still its own call, so check with your IT team if you handle regulated material.

Why this is built this way

Files that pass through someone else's server can be logged, cached, retained after the promised deletion window, or exposed in a breach. Contracts, ID scans, medical records and private photos are exactly the files people most often have to convert, and exactly the ones that should not be handed to a stranger's machine.

It is also why there is no file size limit, no daily quota, and no account. Those restrictions exist to control server costs. With no server in the loop, there is nothing to ration.

Questions

Is my image uploaded anywhere?

No. The splitting happens in your browser using its own image tools, and the file never leaves your device. You can confirm this in the Network tab of your browser's developer tools, or by turning off your Wi-Fi after the first use and splitting again.

How tall an image can it handle?

There is no set limit here. Each piece is rendered on its own small canvas rather than the whole picture at once, so the browser's maximum canvas size never comes into it. Extremely large files are limited only by your device's memory.

What does smart mode actually do?

It samples the image and gives every horizontal row a score for how uniform it is and how much it differs from the row above. Rows with a low score are typically background gaps between sections. Each cut is then moved to the lowest-scoring row within about 20% of its nominal position, so parts stay close to the size you asked for while avoiding cuts through content.

Does it reduce the image quality?

The pixels are copied without resizing. If you save as PNG the result is lossless. If you save as JPG or WebP the parts are re-encoded at the quality you choose, so use a high setting, or PNG, when the image contains text.

Are the parts named in order?

Yes. Each part keeps the original filename with a number appended, zero-padded so they sort correctly — for example detail-01.jpg through detail-12.jpg.