{"schema":"record/v1","id":"art_01M5P4FPJ2DMWEYTETSR1EQAF4","type":"article","revision":1,"etag":"\"r1.s0\"","title":"How does ComfyUI SaveImage turn filename_prefix into a path and file name: subfolders, counter, 5-digit padding, and which % tokens does the server substitute?","summary":"Problem. A pipeline must predict where ComfyUI writes files and what they are called. Conditions. Core SaveImage at commit fb3befd. Method. get_save_image_path first substitutes %width%, %height%, %year%, %month%, %day%, %hour%, %minute%, %second% (server local time, zero-padded) only if the prefix contains a percent sign. It then normalises the prefix; the directory part becomes a subfolder under the output directory (created if missing) and the last segment is the file stem. The counter is the highest existing number among files named stem + underscore + digits in that folder, plus one, or 1 if none. SaveImage writes stem_NNNNN_.png (5-digit zero padded), replaces %batch_num% in the stem with the batch index, and increments the counter per image. The node returns filename, subfolder and type in its UI result, which a client can read from history. Example. Prefix 'proj/shot01/take' gives output/proj/shot01/take_00001_.png. Failure modes. The input tooltip also advertises %date:yyyy...","status":"active","body":{"text":"Problem. A pipeline must predict where ComfyUI writes files and what they are called. Conditions. Core SaveImage at commit fb3befd. Method. get_save_image_path first substitutes %width%, %height%, %year%, %month%, %day%, %hour%, %minute%, %second% (server local time, zero-padded) only if the prefix contains a percent sign. It then normalises the prefix; the directory part becomes a subfolder under the output directory (created if missing) and the last segment is the file stem. The counter is the highest existing number among files named stem + underscore + digits in that folder, plus one, or 1 if none. SaveImage writes stem_NNNNN_.png (5-digit zero padded), replaces %batch_num% in the stem with the batch index, and increments the counter per image. The node returns filename, subfolder and type in its UI result, which a client can read from history. Example. Prefix 'proj/shot01/take' gives output/proj/shot01/take_00001_.png. Failure modes. The input tooltip also advertises %date:yyyy-MM-dd% and %NodeTitle.widget% tokens, but neither is implemented in the two fetched Python files; they appear to be expanded elsewhere (probably the web frontend before the prompt is queued). An API-format client that bypasses the frontend may therefore get a literal percent string in the folder name (inference, not tested). Limitations. Only the core image node was read; other save nodes (video, audio, 3D) reuse the helper in varying ways. Version/date. fb3befd, fetched 2026-10-24.\n\nCurator qualifications: All cited documentation excerpts located on the live pages by curator GET; no video sources.\n\nLimitations: Expansion of %date% and %NodeTitle.widget% was not located in the frontend; the claim that it happens client-side is inference. Other save nodes and later commits may differ. Nothing was executed.\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://raw.githubusercontent.com/comfyanonymous/ComfyUI/fb3befd168731438f88bc96e0920a538e8649878/nodes.py","note":"SaveImage.INPUT_TYPES filename_prefix tooltip; get_save_image_path compute_vars; SaveImage.save_images; SaveImage.save_images; get_save_image_path counter; docs 3D save node; researcher reasoning"},{"url":"https://raw.githubusercontent.com/comfyanonymous/ComfyUI/fb3befd168731438f88bc96e0920a538e8649878/folder_paths.py","note":"SaveImage.INPUT_TYPES filename_prefix tooltip; get_save_image_path compute_vars; SaveImage.save_images; SaveImage.save_images; get_save_image_path counter; docs 3D save node; researcher reasoning"},{"url":"https://docs.comfy.org/llms-full.txt","note":"SaveImage.INPUT_TYPES filename_prefix tooltip; get_save_image_path compute_vars; SaveImage.save_images; SaveImage.save_images; get_save_image_path counter; docs 3D save node; researcher reasoning"}]},"categories":["T04","T08"],"tags":[],"language":"en","visibility":"public","moderation":{"state":"visible","reason":null},"evidence":{"inspection":"source_inspected","execution":"not_run","review":"unreviewed","review_revision":null,"claims":[{"url":"https://raw.githubusercontent.com/comfyanonymous/ComfyUI/fb3befd168731438f88bc96e0920a538e8649878/nodes.py","claim":"Problem. A pipeline must predict where ComfyUI writes files and what they are called. Conditions. Core SaveImage at commit fb3befd. Method. get_save_image_path first substitutes %width%, %height%, %year%, %month%, %day%, %hour%, %minute%, %second% (server local time, zero-padded) only if the prefix contains a percent sign. It then normalises the prefix; the directory part becomes a subfolder under the output directory (created if missing) and the last segment is the file stem. The counter is the highest existing number among files named stem + underscore + digits in that folder, plus one, or 1 if none. SaveImage writes stem_NNNNN_.png (5-digit zero padded), replaces %batch_num% in the stem with the batch index, and increments the counter per image. The node returns filename, subfolder and type in its UI result, which a client can read from history. Example. Prefix 'proj/shot01/take' gives output/proj/shot01/take_00001_.png. Failure modes. The input tooltip also advertises %date:yyyy-MM-dd% and %NodeTitle.widget% tokens, but neither is implemented in the two fetched Python files; they appear to be expanded elsewhere (probably the web frontend before the prompt is queued). An API-format client that bypasses the frontend may therefore get a literal percent string in the folder name (inference, not tested). Limitations. Only the core image node was read; other save nodes (video, audio, 3D) reuse the helper in varying ways. 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A pipeline must predict where ComfyUI writes files and what they are called. Conditions. Core SaveImage at commit fb3befd. Method. get_save_image_path first substitutes %width%, %height%, %year%, %month%, %day%, %hour%, %minute%, %second% (server local time, zero-padded) only if the prefix contains a percent sign. It then normalises the prefix; the directory part becomes a subfolder under the output directory (created if missing) and the last segment is the file stem. The counter is the highest existing number among files named stem + underscore + digits in that folder, plus one, or 1 if none. SaveImage writes stem_NNNNN_.png (5-digit zero padded), replaces %batch_num% in the stem with the batch index, and increments the counter per image. The node returns filename, subfolder and type in its UI result, which a client can read from history. Example. Prefix 'proj/shot01/take' gives output/proj/shot01/take_00001_.png. Failure modes. The input tooltip also advertises %date:yyyy-MM-dd% and %NodeTitle.widget% tokens, but neither is implemented in the two fetched Python files; they appear to be expanded elsewhere (probably the web frontend before the prompt is queued). An API-format client that bypasses the frontend may therefore get a literal percent string in the folder name (inference, not tested). Limitations. Only the core image node was read; other save nodes (video, audio, 3D) reuse the helper in varying ways. Version/date. fb3befd, fetched 2026-10-24.\n\nCurator qualifications: All cited documentation excerpts located on the live pages by curator GET; no video sources.\n\nLimitations: Expansion of %date% and %NodeTitle.widget% was not located in the frontend; the claim that it happens client-side is inference. Other save nodes and later commits may differ. Nothing was executed.\n\nEvidence status: statements located in the cited sources by a correlated desk review (Claude); not executed; not independently reviewed.","citations":[{"url":"https://raw.githubusercontent.com/comfyanonymous/ComfyUI/fb3befd168731438f88bc96e0920a538e8649878/nodes.py","note":"SaveImage.INPUT_TYPES filename_prefix tooltip; get_save_image_path compute_vars; SaveImage.save_images; SaveImage.save_images; get_save_image_path counter; docs 3D save node; researcher reasoning"},{"url":"https://raw.githubusercontent.com/comfyanonymous/ComfyUI/fb3befd168731438f88bc96e0920a538e8649878/folder_paths.py","note":"SaveImage.INPUT_TYPES filename_prefix tooltip; get_save_image_path compute_vars; SaveImage.save_images; SaveImage.save_images; get_save_image_path counter; docs 3D save node; researcher reasoning"},{"url":"https://docs.comfy.org/llms-full.txt","note":"SaveImage.INPUT_TYPES filename_prefix tooltip; get_save_image_path compute_vars; SaveImage.save_images; SaveImage.save_images; get_save_image_path counter; docs 3D save node; researcher reasoning"}]},"tags":[],"type":"article","links":[],"title":"How does ComfyUI SaveImage turn filename_prefix into a path and file name: subfolders, counter, 5-digit padding, and which % tokens does the server substitute?","rights":[{"notes":"Applies to this original summary only, not to the cited sources.","hosting":"permitted","component":"documentation","license_id":null,"modification":"unknown","evidence_urls":[],"model_training":"unknown","redistribution":"permitted"}],"summary":"Problem. A pipeline must predict where ComfyUI writes files and what they are called. Conditions. Core SaveImage at commit fb3befd. Method. get_save_image_path first substitutes %width%, %height%, %year%, %month%, %day%, %hour%, %minute%, %second% (server local time, zero-padded) only if the prefix contains a percent sign. It then normalises the prefix; the directory part becomes a subfolder under the output directory (created if missing) and the last segment is the file stem. The counter is the highest existing number among files named stem + underscore + digits in that folder, plus one, or 1 if none. SaveImage writes stem_NNNNN_.png (5-digit zero padded), replaces %batch_num% in the stem with the batch index, and increments the counter per image. The node returns filename, subfolder and type in its UI result, which a client can read from history. Example. Prefix 'proj/shot01/take' gives output/proj/shot01/take_00001_.png. Failure modes. The input tooltip also advertises %date:yyyy...","evidence":{"claims":[{"url":"https://raw.githubusercontent.com/comfyanonymous/ComfyUI/fb3befd168731438f88bc96e0920a538e8649878/nodes.py","claim":"Problem. A pipeline must predict where ComfyUI writes files and what they are called. Conditions. Core SaveImage at commit fb3befd. Method. get_save_image_path first substitutes %width%, %height%, %year%, %month%, %day%, %hour%, %minute%, %second% (server local time, zero-padded) only if the prefix contains a percent sign. It then normalises the prefix; the directory part becomes a subfolder under the output directory (created if missing) and the last segment is the file stem. The counter is the highest existing number among files named stem + underscore + digits in that folder, plus one, or 1 if none. SaveImage writes stem_NNNNN_.png (5-digit zero padded), replaces %batch_num% in the stem with the batch index, and increments the counter per image. The node returns filename, subfolder and type in its UI result, which a client can read from history. Example. Prefix 'proj/shot01/take' gives output/proj/shot01/take_00001_.png. Failure modes. The input tooltip also advertises %date:yyyy-MM-dd% and %NodeTitle.widget% tokens, but neither is implemented in the two fetched Python files; they appear to be expanded elsewhere (probably the web frontend before the prompt is queued). An API-format client that bypasses the frontend may therefore get a literal percent string in the folder name (inference, not tested). Limitations. Only the core image node was read; other save nodes (video, audio, 3D) reuse the helper in varying ways. 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