Bulk Image Renamer

Image filenames carry surprising weight. They appear in CDN URLs, product pages, sitemaps, alt-text fallbacks, image-search results, and Open Graph previews. A filename like IMG_4823.jpg tells Google nothing, while lattafa-najdia-intense-for-men-edp-100ml.jpg describes exactly what the image shows. For e-commerce stores, content sites, and SEO-driven publishers, descriptive filenames are an easy win — but renaming a few hundred files one-by-one in Finder or Explorer is painful, error-prone, and slow.

The Bulk Image Renamer turns that grind into a two-minute job. You prepare a simple two-column list of old and new filenames — usually exported from a spreadsheet or generated by a script — drop in the images, and download a ZIP of perfectly renamed files. Because everything happens in your browser, you can rename images for a client project, a private inventory, or a sensitive asset library without sending a single byte to a third-party server.

Each line of the mapping is split on a tab, comma, =>, or |. The first column is the original filename (exactly as it appears on disk, including the extension). The second column is the new filename. If the new column has no extension, the original extension is appended automatically — so photo.jpg → product-hero becomes product-hero.jpg.

Matching is case-insensitive on the original filename to forgive small differences between operating systems. If multiple mapping rows resolve to the same final filename, or if the same original is listed twice, the status panel flags the conflict so nothing is silently overwritten inside the ZIP.

The live status table shows a coloured badge for every mapping row — Ready, Missing file, Duplicate target, Duplicate source, or Invalid name. Unmapped uploaded files are listed separately so you don't lose track of anything you accidentally forgot in the spreadsheet. The summary card at the top counts uploaded files, mapping lines, ready rows, and issues at a glance.

Names containing characters that are illegal on common filesystems (/ \ : * ? " < > |) are blocked before they make it into the archive, so the resulting ZIP will always extract cleanly on macOS, Windows, and Linux. If a few rows have issues but most are fine, the "Rename ready files only" button lets you download a partial ZIP without losing your progress.

• Keep your mapping in a spreadsheet column-pair, then copy both columns at once — Excel and Google Sheets paste as tab-separated values, which the tool understands natively.
• Use lowercase, hyphen-separated names. Search engines treat hyphens as word separators; underscores and spaces are weaker signals.
• Include the brand, product, variant, and a meaningful descriptor — e.g. brand-product-color-size.jpg. Don't keyword-stuff.
• Drop the original extension in the new name only if you want to convert between formats — and remember that this tool does not transcode pixels; it only renames the file.