How to Convert Long Images to PDF
Upload your long image (webtoon, comic, or stitched screenshot) and use our auto-detect feature to find panel separators. Each panel will become a separate page in your PDF document. Supported source formats are PNG, JPEG, and WebP; images with clean, consistently colored gutters between panels detect far more reliably than a photo of a printed page or a screenshot with compression artifacts along the panel edges. A source file tens of thousands of pixels tall takes noticeably longer to scan, and on an especially large file the browser tab can briefly stop responding while detection finishes; let it run rather than reloading, since reloading discards any split lines you've already placed.
You can manually adjust split lines by dragging them, add new lines by clicking, or remove lines using the X button. Once satisfied with the layout, click Convert to generate your multi-page PDF. Two panels that belong together — a two-page spread drawn as one continuous image, for instance — can be merged into a single PDF page instead of split apart, so the artwork isn't broken across a page boundary. On a tall image with many panels packed close together, a suggested line can land a little off from the true gutter, especially where two thin gaps sit near each other; drag each one to the center of its gutter rather than trusting the first guess, since a line placed even slightly wrong can shave a sliver off the panel above or below it.
Perfect for Webtoons and Comics
Webtoons and webcomics are designed for vertical scrolling on mobile devices. Converting them to PDF format allows you to print individual panels, create archives, or share in document form while preserving the original panel layout and image quality. Full-bleed splash panels without a visible gutter usually aren't picked up by automatic detection, so add a split line manually wherever a new scene or full-page panel begins. A page-based PDF also suits readers on e-ink devices, which turn discrete pages rather than scroll continuously, and it's the format most print-on-demand services expect when producing a physical doujinshi or fan collection.
Stitched Screenshots to PDF
Long screenshots captured by scrolling (common on iOS and Android) can be split into readable pages. This is useful for documenting web pages, chat conversations, or any content that spans multiple screens. Because auto-detection looks for uniform gutters rather than message boundaries, a split line can occasionally land inside a chat bubble or a paragraph of text — check the preview and nudge the line before converting, especially if the pages will be used as documentation or evidence where legibility matters. A dense capture — a busy group chat or a long spreadsheet with many short rows — can trigger far more candidate lines than a typical scrolling screenshot, since every small gap between elements can resemble a gutter; step through the full list and delete the ones that don't correspond to a real break before converting, or the resulting PDF will have far more pages than the content warrants.
Output Quality
The PDF is generated using lossless compression, so each page maintains the exact quality of your original image. Page dimensions match the panel dimensions, ensuring no stretching or cropping occurs. Because PDF pages don't need to share one fixed size, each page is created at the exact dimensions of its panel, so a tall panel produces a tall page and a short one a short page — unlike a slide deck, nothing gets padded or letterboxed to fit a uniform frame. Splitting doesn't add detail that wasn't in the source, so if the original image was low-resolution to begin with, review the output at full zoom before relying on it for print. Before discarding the source image, open the first and last generated page along with any unusually tall one at full zoom — those are the pages most likely to show a clipped edge if a split line sat a pixel or two off, and it's quicker to re-run the split than to patch a page afterward in a separate editor.