KillMetadataOpen cleaner

WEBM METADATA REMOVER

Remove metadata from a WebM video

WebM uses EBML elements rather than MP4 boxes. KillMetadata replaces supported Tags and private Info values with equal-size Void elements so offsets, Clusters, Cues and SeekHead remain stable.

Choose a file See what changes

THE CLEANING PLAN

Remove what exposes you. Keep what makes the file work.

Every field is shown before the rewrite and classified by action and coverage.

Remove
  • WebM Tags and descriptive values
  • Title, writing application and muxing application
  • Supported dates and identifiers
  • Private Info fields covered by the handler
Preserve
  • Encoded audio and video Clusters
  • Cues, SeekHead and timing
  • Subtitle and accessibility tracks
  • Segment structure and codec headers
Outside this guarantee
  • MKV files and Matroska-only extensions
  • Attachments preserved as content
  • Visible and audible information
  • Unknown EBML elements reported as partial

WHY THE ENGINE MATTERS

Equal-size Void elements keep WebM indexes stable

The EBML parser validates element IDs, variable-length sizes and nesting. Metadata regions are replaced without moving media clusters.

Attachments are content, not ordinary tags, and remain disclosed. Unknown structures prevent an overconfident verified-clean result.

Explore the complete verification methodology →

BEFORE YOU SHARE

A four-step privacy check.

Metadata cleaning is one part of a safe sharing workflow.

  1. 01Confirm the file is WebM, not MKV
  2. 02Review Tags, Info and attachments
  3. 03Create the cleaned copy
  4. 04Play and seek through the verified output

QUESTIONS, ANSWERED

Know the boundary before you clean.

No vague “100% clean” claim.

Are my files uploaded?

No. The cleaner runs in your browser, has no upload endpoint, and only enables the file picker after its processor assets are available locally.

Is the original file changed?

No. KillMetadata reads the original and creates a separately named cleaned copy. It never overwrites the source file.

Does this support MKV?

No. This page and the current handler are for WebM; Matroska-only MKV structures are not claimed as supported.

Are WebM tracks re-encoded?

No. Metadata elements are replaced while encoded Clusters remain unchanged.

RELATED GUIDES

Keep checking the file, not just its name.

VIDEO METADATA REMOVERRemove metadata from video filesRemove supported title, creator, location, date, comment and artwork metadata from MP4, MOV and WebM without re-encoding video or audio.MP4 METADATA REMOVERRemove metadata from an MP4 videoRemove supported metadata from MP4 files locally without re-encoding video or audio. Preserve tracks, timing, subtitles, HDR and indexes.MOV METADATA REMOVERRemove metadata from a MOV videoRemove supported QuickTime MOV metadata, dates, location, software and camera fields locally without re-encoding video or audio.HONEST LIMITSWhat metadata removal cannot promiseUnderstand the boundaries of metadata cleanup, including visible content, hidden document content, signatures, encryption and filesystem attributes.
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