Bulk File Name Studio — Rename Multiple Files Online
Clean names. Preview every change. Download organized files.
Choose files or paste example filenames, pick a preset or build your own ordered rules, review every proposed name with duplicate and unsafe-path checks, and download renamed copies as a ZIP — all processed locally in your browser.
The rename-and-download workflow
Add files by browsing, dragging them in, selecting a whole folder, or just pasting a list of example filenames to try a pattern first. Pick a preset or build rules — a prefix, a find & replace, a case change, sequential numbering, or a full naming pattern — and every proposed name updates instantly, always recomputed from the original filename so edits never compound on a previous preview.
Review the table: duplicate names, unsafe characters, and reserved names are flagged before you can export. When everything looks right, download a ZIP of renamed copies, or export a CSV/plain-text mapping if you just want the list of new names.
Naming product images consistently
A camera or phone hands you IMG_0001.JPG, IMG_0002.JPG, and so on — not great for a storefront or marketplace listing. The Ecommerce images preset builds a pattern like product-blue-front-{counter:003}, so a batch becomes product-blue-front-001.jpg, product-blue-front-002.jpg, and so on, in whatever sort order you choose (natural order handles IMG_2 before IMG_10correctly). If you're setting up a storefront, our ecommerce development services cover the rest of the build.
Prefix, suffix, and sequence examples
- Prefix: adding
client-x-to the start of every selected file. - Suffix: adding
-v2before the extension. - Sequence:
{counter:003}pads to 3 digits (007), starting and stepping by whatever you set. - Full pattern:
{prefix}-{original}-{counter:002}rebuilds the whole name from tokens in one step.
Literal text vs. regex
Literal replace is the default: it matches the exact text you type, so find "final" → replace "v2" only touches files that contain that exact substring. Regex replace treats your text as a pattern — useful for things like stripping a date prefix with ^\d{8}[_-] — but a badly written pattern can be slow or ambiguous, so regex replacements run in a separate, cancellable worker with a time limit, instead of on the page itself.
Duplicate names and folder flattening
Every selected file's output path is checked — including rows hidden by a search or filter — for duplicates, unsafe characters, reserved Windows device names (like CON or NUL), and names that are too long. By default a conflict blocks export; turning on numbered suffixes resolves duplicates deterministically instead. When you select a folder, you can preserve its structure in the ZIP (two files named cover.jpg in different folders are fine) or flatten everything into one folder, where names must be unique.
Renaming vs. converting
Renaming changes a file's name — never its contents or format. Typing .pngover a file that's actually a JPEG won't convert it; the bytes stay exactly the same, only the label changes. This tool preserves each file's real extension by default for exactly that reason.
What stays local, and what's bounded
Files are never uploaded — renaming, previewing, and ZIP creation all happen locally in your browser. The tool only reads each file's name, size, type, and last-modified date (plus image width/height on demand); it never reads EXIF capture dates, document contents, or location data. ZIP export is capped at 500 files or 200 MiB per download; the name-only preview and CSV/text exports handle larger lists. Saved presets store your rules locally if you opt in — never your filenames or files themselves, and they won't survive a cleared browser or a different device.
Common questions
Does this rename the files on my computer?+
No. Everything happens in your browser, and the ZIP download contains renamed copies of your files — your originals on disk are never touched, moved, or deleted.
Will this change my file format?+
No. Renaming only changes the filename text; file bytes and formats are never converted, so this tool can't turn a .jpg into a .png by editing its extension.
What's the difference between literal and regex find & replace?+
Literal replace matches the exact text you type, character for character — it's the default and the safest choice. Regex replace treats your text as a pattern (with optional capture groups), which is more powerful but easier to get wrong; regex runs in a separate, time-limited worker so a runaway pattern can't freeze the page.
What happens when two files would get the same name?+
By default, any duplicate output path is flagged as a conflict and blocks export until you resolve it. Turn on "Add numbered suffixes" to resolve duplicates automatically and deterministically — the preview always shows the exact result before you download.
Does it support numbering like product-001.jpg, product-002.jpg?+
Yes — enable sequential numbering (or add a "Number files" step in Advanced mode) and set a start value, step, and digit padding. Numbers are assigned across your whole selected batch in the sort order you choose, not the currently filtered or paginated rows, so searching or sorting the preview never renumbers anything.
What file and folder information does it read?+
Only what the browser exposes directly: file name, size, type, and last-modified date, plus the relative path when you select a folder. Image width/height are read on demand for supported formats. It never reads EXIF capture dates, document contents, or GPS data, and never guesses an invoice number or photo subject for you.
Is there a limit on how many files I can rename?+
The name-only preview and CSV/text exports handle large lists. ZIP export is capped at 500 files or 200 MiB per download to keep your browser responsive — export in smaller batches if you're over that.
Can I keep my folder structure?+
Yes, if your browser gives you folder paths (via folder selection or dragging a folder in), you can choose to preserve that structure in the ZIP or flatten everything into one folder. Identical filenames in different preserved folders are fine — only the full path has to be unique.
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