Step 1 / source
Add the source media
Source intake
Drop one media file here
Choose an MP3 you own or are authorized to retag.
MP3 only1 file / 50 MB
Checking publication status before file selection...
TEMPORARY MEDIA WORKSPACE / ID3 TAG GENERATOR
ID3 Tag Generator
Create a separately tagged MP3 by copying its audio stream and replacing metadata with bounded ID3v2.3 title, artist, album, track, and genre values.
Request-scoped temporary processingAdd one supported file up to 50 MB. Long or unusually large-frame media may be rejected before processing.No account required
Local API readinessMedia service ready
One bounded job runs per API worker by default.The processor required by this tool is available, and this worker can accept a temporary job.
1 file / 50 MB
Temporary server workspace
The selected bytes are sent only to the Nirmion media API for this request. Processing uses a private temporary workspace rather than permanent catalogue storage.
Request-scoped cleanup
Server-side source and result files are removed when the response stream closes. Re-downloads use the result Blob retained only in this browser tab.
Original stays unchanged
Nirmion writes a separately named result containing nirmion_tools and never overwrites the selected source file.
Know the product contract
What goes in, what changes, what comes back
Every media page documents the accepted source, the selected FFmpeg transformation, the output container, and the limits that can affect the job.
Prepare the source
Confirm the source is the intended MP3 and verify the title, credits, album, track sequence, and genre against an authoritative record.
Apply one operation
FFmpeg copies the primary MP3 audio stream, removes inherited metadata, and writes only the entered ID3v2.3 fields.
Receive a separate file
Inspect the result in the actual library or player because applications can map genre and track tags differently.
Plain-language method
How tags are replaced without audio encoding
Audio is not re-encoded, but artwork, chapters, lyrics, comments, and unselected custom frames are not preserved.
- 01Choose valid source media
Confirm the source is the intended MP3 and verify the title, credits, album, track sequence, and genre against an authoritative record.
- 02Review the operation settings
Use consistent spelling and capitalization; leave unknown optional values blank.
- 03Inspect and download the result
Inspect the result in the actual library or player because applications can map genre and track tags differently.
Useful when
Practical jobs this tool handles
- Tag a voice recording archive.
- Standardize podcast episode fields.
- Prepare authorized MP3 files for a library import.
Before processing
Check the source and output choices first
- Verify title and credits.
- Use a valid track format.
- Keep the source MP3.
- Inspect tags after import.
Container and codec
Understand the output format
The output remains MP3, copies the primary audio stream without re-encoding, and writes ID3v2.3 metadata for practical compatibility.
Know the boundary
ID3 tags do not establish ownership
Metadata can be edited and is not a substitute for rights records, provenance, or an authenticity signature.
Quick answers
Questions before you process media
These answers describe the actual upload, FFmpeg processing, download, and temporary-retention contract.
Is audio quality changed?
No. The primary MP3 audio stream is copied.
Is existing artwork retained?
No.
What track format is accepted?
Use a number such as 3 or a number/total such as 3/12.