Merge images
Merge images lays files into one side-by-side (or stacked) strip. Comparison shots, before/after without the slider, a contact sheet of sorts. It isn't a panorama stitcher and it won't align horizons.
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Compositing
Merge images, add a text watermark, or pack and slice sprite sheets in the browser. The originals aren't uploaded.
Runs in your browser · Nothing uploaded
- Merge imagesCombine images into one side-by-side strip.Runs in your browser · Nothing uploaded
- WatermarkText watermark with adjustable opacity.Runs in your browser · Nothing uploaded
- Sprite sheet generatorPack frames into a sheet.Runs in your browser · Nothing uploaded
- Sprite sheet slicerSlice a sheet into frames (zip).Runs in your browser · Nothing uploaded
About Compositing
Compositing here is the boring, useful kind: put two pictures next to each other, stamp text on a photo you're about to send out, pack animation frames into a sheet, or cut a sheet back into frames. There's no layer blend-mode playground and no “remove the background with AI.”
Watermarks on this site are text. They discourage casual reuse; they don't prove ownership in court and they won't survive a determined crop. If the file must not leak, don't send the file.
Sprite tools are for game and UI work. Generator packs frames you drop. Slicer cuts a grid back into a zip of frames. If the grid is irregular, a desktop editor is still the honest tool.
Tools in this category
Watermark
Watermark draws text over the image with opacity, size, and position. Copyright lines, “PROOF,” a site name. For the same stamp on many files, use batch watermark instead of this page.
Sprite sheet generator
Sprite sheet generator packs frames into a grid. You drop the frames; you get one sheet. Useful for CSS animation and simple games. Frame size should be consistent or the grid will look like a mistake.
Sprite sheet slicer
Sprite sheet slicer does the reverse: given a sheet and a cell size, it writes a zip of frames. Off-by-one padding and uneven gutters will produce junk frames, check the first cell before you unzip fifty.
Common questions
Is a text watermark enough to stop someone reusing my photo?
No. It raises the effort for a casual copy-paste. Anyone can crop or clone it out. If the picture must not circulate, don't hand out a useful resolution in the first place.
How is merging different from a sprite sheet?
Merge is for looking at two or more pictures together. A sprite sheet is a regular grid meant to be played as frames. If you need a filmstrip of a walk cycle, use the sprite generator. If you need “these two product shots on one image,” merge.
Can I watermark without the photos leaving my machine?
Yes. That's the point of this category. Batch watermark exists when you have a folder. Same text, many files, zip download, still no upload.
Why these tools don't upload your files
There is no server to upload to. Each page is a static file, and the work happens in your browser. Your file is read from disk into memory, processed, and handed back as a download. Once the page has loaded you can disconnect from the network and it keeps working. The longer explanation