Another Save Image with Tag

Save Image saves a file. AnotherSaveImageWithTag saves a file with a label embedded in the PNG metadata - a custom tag string that travels with the image wherever it goes. It's the difference between a folder full of anonymous 00001.png files and a folder where every image carries its own readable annotation.

Where this pays off: dataset curation. You're generating images for a training set, or collecting variations, and you want each output tagged with something meaningful - the prompt, a category, a seed, a quality flag. The tag lives inside the PNG's metadata under the another_tag key, so it survives renames, folder moves, and being loaded into other tools that read PNG metadata. It's a quiet little bookkeeping win.

How it works

It's a save node with bookkeeping on the side. For each image in the input batch it computes a save path (same filename_counter scheme ComfyUI's own Save Image uses, so files get numbered _00001_ suffixes), writes the PNG, and attaches your tag string as text metadata. The clever part is batch-to-tag mapping: if you pass a list of tags, each image in the batch gets its corresponding tag; if you pass fewer tags than images, the last tag is reused for the rest. So a batch of N images and a list of N tags produces N individually-tagged files.

The tag is stored in a custom metadata field, separate from the workflow prompt data, so it's a label you control rather than a dump of the graph.

Inputs and outputs

• images (IMAGE) - the images to save.
• custom_tag (STRING) - the tag text. Because it's force-input enabled, you can wire it to a text node, which is how you'd generate per-image tags programmatically.
• filename_prefix (STRING, default "AnotherTag") - the prefix for the saved filenames.

No outputs - it's an output node, the end of the line. The result is files on disk in your ComfyUI output directory.

Installing it

Part of the AnotherUtils pack:

cd ComfyUI/custom_nodes
git clone https://github.com/marcoc2/ComfyUI-AnotherUtils.git

Restart ComfyUI, or install via ComfyUI Manager (search "AnotherUtils"). No extra dependencies - it uses the standard ComfyUI save-path machinery.

Gotchas

The tag is metadata, not a filename - if your workflow depends on scanning filenames for labels, this isn't it, and you'll need to read the PNG metadata to get the tag back out (the pack's own metadata-reading loaders are a natural partner). Also, the metadata only survives as long as the file is a PNG - re-encoding to JPEG strips it.

One subtlety with the batch mapping: if your tag list is longer than your image batch, the extra tags are ignored. And custom_tag is force-input, which means you'll want a text node feeding it rather than trying to type into the widget. For anyone generating labeled training data at scale, this is a genuinely handy little node.