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MP3 tag editor (ID3)

Drop an MP3 to load its tags, edit the fields, add a cover, and download the tagged file. Everything runs in your browser; your file never leaves your device.

How MP3 tag editor (ID3) works

MP3 tag editor lets you read and rewrite the ID3 metadata of an MP3 file in your browser: title, artist, album, year, genre, track number, comment, and embedded cover art. Drop an MP3 and the existing tags pre-fill the form automatically; change what you need, attach a JPEG or PNG cover if you want, then download the updated file. The work is done by ffmpeg compiled to WebAssembly using stream copy (-c copy), so the audio data is never re-encoded and quality is not touched.

The pre-fill reads ID3v2 text frames on a best-effort basis. Unusual encodings or very old ID3v1-only tags may not parse correctly, but you can always type the values in manually. No account, no watermark.

Written by Bastien Sulyan

How to use MP3 tag editor (ID3), step by step

  1. Drop an MP3 onto the upload area; the existing ID3 tags pre-fill the form fields.
  2. Edit any field you want: title, artist, album, year, genre, track number or comment.
  3. Optionally attach a JPEG or PNG image to embed as album art (APIC frame).
  4. Click 'Save tags' and download the updated MP3 to your device.

Common use cases

  • Music library cleanup: fix misspelled artist names or album titles that media players display incorrectly.
  • Podcast production: add episode title, show name and a cover image before distributing an MP3 episode.
  • Personal archive: tag field recordings or voice memos with descriptive titles and dates before archiving.
  • Cover art update: replace a low-resolution or missing album cover without re-encoding the audio.

Frequently asked questions

Does ffmpeg re-encode the audio when saving tags?

No. ffmpeg uses stream copy (-c copy), which passes the audio data through untouched and only rewrites the ID3 metadata block. The audio waveform is identical byte-for-byte to the original, and there is no quality loss regardless of bitrate.

What image formats are accepted for the cover art?

JPEG and PNG are accepted. The image is embedded as an ID3 APIC (Attached Picture) frame, which is the standard field that media players like iTunes, Windows Media Player and car stereos read as album art. There is no enforced size limit, but keeping covers below 1 MB avoids bloated files.

My existing tags did not pre-fill the form correctly. Why?

The pre-fill reads ID3v2 text frames using a best-effort parser. Files tagged with only the older ID3v1 format, or with a non-standard character encoding, may not parse cleanly. You can always type the correct values manually; the save step does not depend on what was pre-filled.

Does the MP3 tag editor send my audio file to a server?

No. ffmpeg is compiled to WebAssembly and runs inside your browser tab. Your MP3 is loaded into local memory, the ID3 frames are rewritten there, and the tagged file is offered as a download from your device. Nothing is sent to Sunasty's servers or any third party.

Can I edit tags on formats other than MP3?

This tool is designed specifically for MP3 files and their ID3 tag structure. For other audio formats (FLAC, M4A, OGG), the metadata system differs (Vorbis comments, iTunes atoms) and this tool may not handle them correctly.

What happens to the original file?

Your original file is not modified. The browser reads it into memory, ffmpeg writes a new version with the updated tags, and that new version is offered as a download. Your original stays on disk exactly as it was.