Image Stitching
Upload multiple images, choose a stitching mode, drag to reorder, join them into a long or wide image online, and download with one click.
FAQ
What's the difference between vertical and horizontal stitching?
Vertical stitching stacks images with a uniform width, ideal for long screenshots, product detail pages, and comic strips. Horizontal stitching places images side by side with a uniform height, ideal for panoramas and banner comparisons.
What does the reference base mean?
The reference base determines which image's size is used to unify all image dimensions. First: all images scale proportionally to the first image's size. Smallest: scale to the smallest image. Largest: scale to the largest image. The scale then further adjusts the percentage on this basis.
Are there size limits on the stitched result?
Canvas has a maximum size limit: a single side no larger than 65535 pixels, and total pixels no more than 160000000 (about 160 million pixels). If the result exceeds this limit, the tool shows a warning — try lowering the scale or reducing the number of images.
Are image files uploaded to a server?
No. All stitching is done locally in your browser via the Canvas API; image files are never uploaded to any server, so you can use it with confidence.
Related guide
How to Stitch Screenshots Into One Long Image
Vertical versus horizontal joining, what the reference width actually controls, why one long screenshot can fail the canvas limits, and how transparency behaves in the output.