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PatternRename uses the File System Access API to read your folder and rename files directly. This requires a Chromium-based desktop browser — Safari, Firefox, and all mobile browsers do not support it yet.
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📱 Tip: This tool works best on a desktop PC.
You can browse and explore the app on your phone, but to actually rename files you'll need a desktop browser (Chrome or Edge on Windows/Mac/Linux). The File System Access API used for renaming is not supported on mobile yet.

✏️

Rename many files at once — right in your browser

Build a new filename by combining multiple name parts side-by-side. type a few values to Smart Fill a sequence. The live New Filename Preview live so you can verify before renaming anything. Rows & columns can be extended as needed.

Steps:

① Load a folder

② Fill pattern unit

③ ⚡ Smart Fill

④ Check the Preview

⑤ Rename All Files

No	Original Filename loaded from your folder	🕐 File Time modified time · [gap from prev]	🖼 Preview	✅ New Filename Preview all parts joined → ready to rename

▼ Pattern examples & tips

Example filename: USA_PET_PUPPY_2026_A.jpg · Positions are 1-based characters of the original filename (excluding extension).

Feature	Prefill (you type)	Auto-fill (next rows)	Result in Preview	Notes
Simple letter sequence	X, Y	Z, A, B …	…_X, …_Y, …_Z	Wraps A→Z continuously
Alphanumeric with leading zero	A3B05, A3B07	A3B09, A3B11 …	USA_A3B05.jpg …	Numeric part increments; leading zero preserved when present
Repeating pair pattern	A, A, C, C	E, E, G, G …	…_A, …_A, …_C, …_C	Write the repeat block twice so Smart Fill skips ahead correctly
Fixed-suffix repeat pattern	DOF, DOK	DOF, DOK …	…_DOF, …_DOK	Alternates indefinitely; tip — include the suffix (e.g. `5_, 6_, 7_`) to lock it
Position list (char extract)	[5,6,7,3-1]	same for all rows	PETASU	Chars at pos 5,6,7 = PET; pos 3 down to 1 = ASU (from USA_PET_PUPPY_2026_A)
RegExp extract	/\d+/	same for all rows	2026	Extracts the first run of digits — yields 2026 from the filename
Pos: full name slice	[1-50]	same for all rows	USA_PET_PUPPY_2026_A	Advance mode: grabs chars 1–50 of the original name (without extension)
Move to new subfolder	USA_PET_PUPPY_2026_A/	combine with other cols	USA_PET_PUPPY_2026_A/ …renamed….jpg	Trailing `/` creates a subfolder named after the value and moves the file into it

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