When you have several images to handle, you usually want one of two things: stitch them into a single long image, or bundle them page by page into one document. They sound alike but serve completely different purposes.
This article separates the situations where stitching images shines from the ones where bundling into a PDF is the better call.
When vertical stitching works best
Vertical stitching is ideal when you want a top-to-bottom flow captured in one view. Turning something you would otherwise scroll through into a single image makes it far easier to share and save.
- Chat and messenger logs — several screenshots joined in conversation order
- Long receipts and order histories — cut-off items joined so the whole thing is visible at once
- Full-page web captures — reassembling fragmented scroll screenshots in their original order
- Recipe or manual steps — content where sequence matters, aligned top to bottom
When horizontal stitching works best
Horizontal stitching is strong for side-by-side comparison. Place two images next to each other and the difference jumps out.
- Before and after — edits, cleaning, or treatment results compared
- Product colors and options — choices laid out side by side
- Panorama-style continuous scenes — a landscape flowing left to right
One image vs. a multi-page PDF
Here is the key fork. If the result should be one continuous long image, stitching is right. If instead you want each picture to turn as its own page, bundling into a PDF is better.
- Stitched image = social uploads, shares that preview instantly, keeping a capture as a single frame
- PDF bundle = printing, email document attachments, page-by-page material, contracts and submissions
- Many pages standardized to A4 favor a PDF; an unbroken flow favors stitching
Alignment and background tips
If the images you join have different widths, the result looks ragged. Pick an alignment (left or center) and set a background color to fill the leftover space. Use white for a white document, and match the tone for a dark UI capture so the padding blends in.
Format matters too. JPG stays light for photos and gradients, while PNG keeps text and screenshots crisp. To preserve a transparent background, you must stitch as PNG.
You can do all of this right in Switching's JPG merge and PNG merge tools. Upload your images in order, set alignment and background, and they are stitched into one. Because files are processed inside your browser and never uploaded to a server, even sensitive images like chat logs or receipts stay private. If you need a document that turns page by page, use the JPG to PDF tool instead.