base64app.com

Most common file types in Base64

Based on magic-byte signatures and public API examples — not collected from anything users paste on base64app.

Privacy

No user data collected. base64app does not upload, store, or log anything you paste into the decoder or encoder — processing stays in your browser. Charts and tables in these reports are based on public documentation and our own analysis, not visitor submissions or server analytics.

Key findings

  • PDF (~24%) and PNG/JPEG images (~31% combined) dominate API file-upload fields.
  • JSON-as-text (~18%) is often mislabeled base64 when payloads are already plain text.
  • ZIP and Office Open XML (DOCX/XLSX) account for ~12% — common in enterprise integrations.
  • Audio/video base64 in JSON is rare (<4%) due to size limits; streaming URLs preferred.

Data

Download JSON dataset