Step 1 / source
Choose the source
Drop one file here
Choose the file whose name causes upload, sharing, URL, or cross-platform problems.
Checking publication status...LOCAL FILE UTILITY / PORTABLE NAME
Filename Cleaner
Create an identical file with a shorter, portable filename while preserving its extension and every source byte.
Processed in this browserOne file up to 25 MB. The content and extension are preserved; only the downloaded filename changes.
1 file - 25 MB
No file upload
This operation runs with browser APIs. Nirmion receives catalogue requests, not the selected source bytes.
Original stays unchanged
The converter creates a separately named output. It never writes back into the source file.
Bounded work
One file up to 25 MB. The content and extension are preserved; only the downloaded filename changes.
Plain-language method
What the cleaner changes
The filename is Unicode-normalized, path-reserved characters are removed, words are joined consistently, and the original extension is retained. The file body is not parsed or converted.
- 01Choose a valid source
Choose one file. The current filename is treated as a label, never as a path to another location.
- 02Review the conversion choices
Hyphens work well for web assets; underscores are common in data workflows. Lowercase improves consistency.
- 03Inspect the separate result
You receive a byte-identical download with the new name shown in the result facts.
Useful when
Practical jobs this tool handles
- Prepare an asset name for a website upload.
- Remove punctuation that breaks a legacy system.
- Standardise a shared attachment before sending it.
Before converting
Confirm naming, not conversion
- Check the new name shown before filing the download.
- Remember that the original file remains where it was.
- Use a true format converter when the extension itself is wrong.
Know the boundary
An extension is not a format
The extension is preserved because changing it would not convert the file. If the extension and real format disagree, inspect the MIME type and use a real converter.
Quick answers
Questions before you convert
The tool changes the label and nothing else.
Will image or document quality change?
No. The downloaded Blob contains the same file bytes.
Why are some symbols removed?
Characters reserved by common filesystems and path separators can cause portability problems.
Can I rename many files?
Use Batch File Renamer to create a numbered ZIP for up to 20 files.