Create, check, and fix filenames in seconds.

The File Name Generator is built for anyone who needs to create a batch of filenames before a single file exists — photographers naming a shoot before export, store owners preparing a product catalog, or a team standardizing document names ahead of a migration. Enter a base name, choose a separator, and it builds a sequential filename generator pattern with zero-padded numbering (product-001.jpg, product-002.jpg…) so files sort correctly no matter how many you add. It also supports a numbered filename generator workflow with custom start numbers, dates, and unique IDs, plus prefixes and suffixes for versioning.

Because it's aimed at real publishing workflows, it doubles as an image filename generator for product photography, stock photos, and social assets; a photo filename generator; a document filename generator for contracts, invoices, and reports; and an SEO filename generator that lowercases text, strips special characters, and swaps spaces for hyphens — the format search engines read most reliably when indexing files and images. Every name previews instantly, and the full batch can be copied or exported as TXT or CSV before you touch a single file.

The File Naming Validator works as a filename character checker, filename rules checker, and filename convention checker in one pass, and as both a valid filename checker and an invalid filename checker at once. Upload files or paste a list of names, and it runs each one against a naming preset — general best practices, or a strict Windows filename validator, macOS, Linux, and web/SEO rule set — flagging exactly what's wrong and why.

It's built to catch the mistakes that cause real damage later: it flags invalid characters and reserved Windows names such as CON, PRN, or LPT1; a duplicate filename checker finds exact and case-insensitive collisions that silently overwrite each other; and a filename length checker warns before a name crosses the 255-character limit that trips up some filesystems and sync tools. Because it also works as a bulk filename validator and batch filename validator, you can check hundreds of files in a single report instead of opening them one at a time, with pass/warning/error status, a naming health score, and a suggested fix for every issue.

For files that already exist, the Bulk File Renamer is a bulk file renamer and batch file renamer in one: add a folder of files, define a pattern — find-and-replace text, sequential numbering, case conversion, separator normalization — and preview every before/after result before anything changes. It's built so you can rename files online and rename multiple files without installing anything: bulk rename photos, bulk rename images, and bulk rename PDFs are all supported, and any conflict — like two files that would land on the same name — is flagged and blocked before you can proceed.

Unlike tools that overwrite files in place, this bulk filename change is one you can undo just by not downloading the result: renamed copies are packaged into a single ZIP, so your originals are never touched. That makes it a safe way to run a zip file name change or a zip batch file name pass across hundreds of files, a group file name change before a client handoff, or a mass file name edit on an entire project folder — all without giving a desktop app access to your file system.

Most people don't need to rename a single file — they need a batch file name editor for hundreds of them at once, on a deadline. That's the gap FileNameTools fills: a file rename utility that covers the full loop, from a file name change online, to validating what's already on disk, to a batch filename change on what's broken — without switching between three different downloaded apps or paying for a subscription.

Desktop tools like Bulk Rename Utility get the job done, but they're typically Windows-only, need installing, and ask you to trust a downloaded executable with full access to your files. FileNameTools works the same way in any modern browser, on any operating system, and nothing you type or upload is ever sent to a server — every generator, validator, and renamer pass happens locally using the File and Blob APIs already built into your browser. That makes it a free bulk rename utility you can open on a work laptop, a personal machine, or a shared computer, and bulk rename files without software to install, trust, or clean up afterward.