メディアメタデータ編集

Step-by-step

1. Drop a video or audio file (or click to browse).
2. The editor reads the file's existing tags and pre-fills the form.
3. Edit the fields you want to change. Leave the rest alone.
4. Optional: replace the cover image with a JPG, PNG, or WebP.
5. Choose whether to overwrite existing tags or only fill in missing ones.
6. Click Apply Metadata and download the new file.

Field reference

Title

The track or video name shown in players, libraries, and platforms.

Artist

The primary creator. For podcasts, this is usually the host or show.

Album / Collection

The album, season, or series the file belongs to.

Album Artist

The credited artist for the whole collection. Useful for compilations.

Year

Release or recording year. Stored as a date inside the container.

Genre

Free-form category — Documentary, Pop, Lecture, Tutorial, etc.

Track # / Tracks total

Position of this file inside its album, plus the total count.

Disc # / Discs total

For multi-disc releases. Most files leave this empty.

Description

A short summary used by podcast apps and video players.

Comment

Free-form notes such as engineer credits or production notes.

Lyrics / transcript

Full lyrics for music or a transcript for spoken-word media.

Cover image

Embedded artwork. Square JPGs around 1000×1000 px work everywhere.

Cover image type

Front, back, or other. Most players only show front covers.

Embed artwork into file

When off, no cover is written. Useful for stripping artwork.

Overwrite existing metadata

When on, empty form fields clear the original tag. When off, blanks keep the original.

Format-specific notes

• MP4 / MOV / M4A: tags written as iTunes-style atoms (covr, ©nam, ©ART, …). Compatible with QuickTime, iTunes, Plex, and most players.
• MKV / WebM: Matroska Tags + Attachments. Cover art appears as an attached PNG/JPEG file in players that follow the spec.
• MP3: ID3v2 frames including APIC for embedded artwork. Compatible with practically every audio player.
• FLAC / Ogg / Opus: Vorbis comment block plus PICTURE for cover art. Works in foobar2000, VLC, and modern hi-fi players.
• WAV: Editor uses an ID3 chunk so a richer set of tags survives outside basic INFO LIST.
• AAC / ADTS: ID3v2 wrapper, like MP3.

Practical tips

• Keep covers under 1 MB and square — many libraries scale them to 600×600.
• Use 4-digit years (e.g. 2024). The editor stores Jan 1 of that year.
• For podcasts, set Title, Artist, Album, Description, and a square cover.
• If a player ignores a field, check whether it expects ID3v1 or a different metadata wrapper. Switching the source format usually fixes that.
• Double-clicking Edit Another File resets the form for batch-style edits.

Privacy and safety

• No account, no signup, no upload. The browser does the work.
• The original file is preserved. The result is always a new download.
• Cover images are read into memory only long enough to embed them.
• The tool refuses files larger than 2 GB to keep memory pressure manageable on phones and laptops.