Bulk File Renamer / File Naming Studio

Bulk file renaming allows you to rename multiple files simultaneously using automated rules such as sequential numbering, prefixes, suffixes, search-and-replace, and case formatting.

Direct Rename is available when the current browser and execution environment provide the required File System Access API capabilities and the user grants read/write permission. Unsupported environments can use Safe Export instead.

No. Files are processed entirely within your browser and are never uploaded to any remote server. Filenames, directory paths, file contents, hashes, and metadata are never sent across the network or to analytics.

No. The rename engine strictly operates on filename metadata. Image, video, audio, and document payloads remain byte-for-byte identical.

Yes. In supporting browsers, click 'Select Folder' to choose a directory. All files within the directory are instantly listed for batch operations.

Before any modifications occur on disk, the tool displays a side-by-side comparison of original and target filenames, complete with change highlights and error indicators.

Dry Run simulates the entire rename pipeline in memory without touching your filesystem, allowing you to verify numbering, formatting, and collision states safely.

You can specify start number, step increment, zero-padding (e.g. 001), direction (ascending/descending), and placement (prefix, suffix, replace existing number, or standalone).

Natural sort orders numeric components by value rather than strict ASCII codes, correctly arranging 'file1, file2, file10' instead of 'file1, file10, file2'.

Yes. Full regular expression search and replace with capture groups ($1, $2) is supported. The engine includes automated ReDoS detection to protect against exponential backtracking.

You can convert filenames to lowercase, UPPERCASE, Title Case, camelCase, snake_case, or kebab-case with a single click.

Yes, you can standardize extensions to lowercase or replace them. Please note that changing a filename extension does not convert the underlying file format.

Filename length rules vary across operating systems and filesystems. Solasu warns about names that exceed its configured portability threshold (255 characters/bytes); this threshold should not be interpreted as a universal filesystem limit. Windows reserved device names (CON, PRN, AUX, NUL, COM1-COM9, LPT1-LPT9) and forbidden characters are also flagged beforehand.

Yes. Unicode characters across all languages (Japanese, Arabic, Cyrillic, accented Latin, emojis) are fully preserved using NFC normalization.

Collision detection identifies when two or more files would end up with identical filenames after applying your rules, preventing accidental data overwrites.

Solasu validates rename targets before execution and uses a multi-stage rename plan to avoid detected name collisions, including common swap and chain scenarios. Filesystem-level atomicity is not guaranteed by Solasu.

Safe Export creates a renamed ZIP archive completely in browser memory without modifying your original files. Please note that filesystem metadata (such as OS creation timestamps and permissions) may differ after ZIP export.

They produce shell scripts containing safely escaped rename commands so you can audit the exact filesystem operations before executing them in your local terminal. The generated script has not been executed by Solasu.

Yes. Click 'Export Rules JSON' to save your rule configuration to a file. You can import it anytime using 'Import Rules JSON' (hardened against prototype pollution).

Solasu can generate an undo plan for the rename operation where supported, presenting reverse steps based on the immediate rename plan. However, complete filesystem recovery cannot be guaranteed in every external state (for example, if files were moved or altered externally).

None. All filenames, rule parameters, and intermediate structures are stored in volatile session memory only and are immediately destroyed when you close the tab.

The engine uses efficient in-memory indices and virtualized list rendering, enabling smooth preview and sorting of 10,000+ files without browser freezing.