Batch File Renamer vs ExifRenamer

Batch File Renamer is a free, open-source web app for preparing new names for multiple files and previewing the results. It processes files locally in the browser, does not upload them and leaves source files unchanged. Ten operations cover find and replace, prefixes and suffixes, case changes, numbering, date and time, regular expressions, cleanup and extension changes. Presets handle numbering, date prefixes, filename cleanup, music files, episode formatting, lowercase conversion and replacing spaces. Users can save reusable operation chains in browser local storage and undo or redo changes across 50 operation states. Validation flags invalid or empty names, reserved Windows device names, trailing spaces or periods, names over 255 characters and duplicate selected outputs. Export creates a ZIP archive containing selected valid files as renamed copies rather than changing originals on disk. Modern browsers support file import; folder picking is best in Chromium-based browsers, and save-picker support varies. The MIT license permits use, modification and distribution subject to its notice. The web plan costs nothing and needs no installation or registration.

ExifRenamer is a free macOS app that renames photos, movie clips and audio clips from embedded date and time information. Its suggested YYYY-MM-DD_hh-mm-ss pattern gives filenames chronological order in Finder. Users can drag files onto the app icon or configure it as an automatic task in Apple Image Capture. A preview appears before renaming, with controls for naming styles, prefixes, suffixes, time-difference correction and sequence counters. The app can create a destination folder, move renamed files there and forward them to other applications. Listed formats include JPEG, TIFF, MOV, MP4, M4V, AVI, AIFF, AIF, WAV, MRW, NEF, CRW, CR2 and THM, with camera support including Casio, Olympus and Canon. ExifRenamer changes only filenames, not file contents. Some cameras may omit the required date and time metadata in supported formats, so extraction can fail. The page lists version 2.4.0 (15) and compatibility with macOS Sequoia. The plan is free, with optional donations.