# Edit MP3 Tags (ID3) in Your Browser

> Audio Tag Editor reads and writes ID3v2 tags on MP3 files directly in your browser. Open an MP3, edit title, artist, album, year, genre, track number, comment, and album art, then download the updated file. No upload, no install — works like mp3tag without leaving your browser. Your audio never leaves your device.


Live tool: https://lofttools.com/tools/audio-video-tools/audio-tag-editor

Category: Audio and Video


## What it does

- Read existing ID3 tags from any MP3 — fields pre-filled automatically
- Edit title, artist, album, year, genre, track number, and comment
- Replace or add album art (JPEG / PNG / WebP)
- Remove album art with one click
- Download the tagged MP3 — audio is untouched, only the ID3 header changes
- 100% browser-based — files never leave your device
- Up to 100 MB per file

## How it works

1. **Open your MP3** — Drag and drop an MP3 file onto the upload area, or click to browse. The existing ID3 tags are read automatically and fill the form.
2. **Edit tag fields** — Update the title, artist, album, year, genre, track number, and comment fields as needed.
3. **Replace album art (optional)** — Click "Add art" or "Replace art" to pick a JPEG, PNG, or WebP image. A thumbnail preview appears immediately.
4. **Save and download** — Click "Save tags" to write the updated ID3 header and download the new MP3. The audio data is preserved losslessly.

## FAQ

### Does this upload my MP3 to a server?

No. The entire process runs locally in your browser using the Web Audio API and browser-id3-writer. Your audio file never leaves your device.

### Will editing tags re-encode my audio?

No. ID3 tags are stored in a header separate from the audio stream. Writing tags prepends a new ID3 block without touching the audio data — it is completely lossless.

### Which tag formats are supported?

Writing uses ID3v2.3, which is universally supported by media players, phones, and streaming tools. Reading supports ID3v1/v2, Vorbis Comments (OGG/FLAC), and AAC/M4A atoms via music-metadata — but tag writing is MP3-only.

### What image formats can I use for album art?

JPEG, PNG, and WebP. The image is embedded as an APIC frame (type 3 — Cover front) in the ID3 header.

### Is there a file size limit?

The free tier supports MP3 files up to 100 MB — enough for high-bitrate albums and long recordings.

## Tips

- **Tags pre-fill automatically** — Drop your MP3 and the existing ID3 fields (artist, album, year, genre, track, art) are read and pre-filled — only change what needs updating.
- **Album art stays under 500 KB** — Large cover images increase download size without improving playback quality. Resize your art to 500×500 px before embedding for the best balance of quality and file size.
- **Lossless tag editing** — Unlike re-encoding tools, tag editing replaces only the ID3 header. Your audio bitrate and quality are preserved exactly as they were in the original file.

## Privacy — what we do not do

This tool runs entirely in the browser via WebAssembly. Your file never reaches a Loft Tools server. Specifically:

- **No upload.** The file bytes load into the browser tab's memory and process on your own CPU. Open DevTools → Network and observe zero outbound requests carrying file data while Edit MP3 Tags (ID3) in Your Browser runs.
- **No AI training on your file.** Loft does not train models. We could not train on a file we cannot see.
- **No content scanning.** No virus, copyright, or content-moderation pass against your file. The bytes are not accessible to us.
- **No server-side log of file contents, filenames, or EXIF metadata.** Cloudflare edge captures URL and truncated IP for abuse defense (standard CDN behaviour). Cloudflare Web Analytics records anonymous page hits, no cookies, no PII. Nothing about your file content reaches any log.
- **No retention.** Close the tab and the file leaves browser memory. No backups exist on our side because no copy ever existed on our side.
- **No account.** No email, no signup, no auth, no telemetry tied to you.
- **Offline-capable after first visit** (PWA). Once you've loaded a tool, it caches; later sessions work without internet. For high-sensitivity files, run the tool once online to warm the cache, then disconnect before processing.

Compare with upload-based services: each transmits your file to a processing server. Even over HTTPS, each has logs, retention windows, and subpoena exposure. Loft has none of these because the server architecture does not include your file.

## More

- All tools: https://lofttools.com/tools
- Category: https://lofttools.com/tools/audio-video-tools
- LLM index: https://lofttools.com/llms.txt