The file-data boundary

The converter receives a browser File object after your action. The application does not send that object or its bytes through an upload request. Conversion inputs live in JavaScript objects, decoded buffers, Canvas pixels, or FFmpeg's in-memory virtual filesystem. Outputs are local Blob URLs, not public web URLs.

Temporary data and cleanup

Preview and output URLs last for the current page session. The interface revokes them when an item is removed or all results are cleared. FFmpeg deletes named input and output files after a completed operation or a reported encoder failure. Closing the tab is the final cleanup boundary. The site does not create accounts or a server-side conversion history.

Network requests you can still expect

  • HTML, CSS, JavaScript, PDF, audio, and FFmpeg assets from day2dayfile.com.
  • Hosting requests recorded in ordinary server access logs.
  • Google advertising and consent requests on monetized web pages.
  • No converter request containing the selected file bytes.

The downloadable package contains local copies of the required engines and is built to exclude executable advertising code. It can be opened after disconnecting from the internet.

Metadata is part of privacy

Image re-encoding through Canvas generally removes EXIF and GPS data, while unchanged-file passthrough preserves it. Audio and video re-encoding builds new containers and should not be relied upon to preserve tags, artwork, chapters, subtitles, or source metadata. Always inspect output when metadata is important.

Security limits

Local processing reduces exposure to an upload service, but it is not a substitute for endpoint security. A compromised browser extension, device, or operating system may access data the browser can access. Keep the browser updated, avoid unknown extensions, retain originals, and do not process files you do not trust. Conversion is not malware scanning or file repair.

Verify it yourself

Open developer tools, select the Network panel, clear the log, and run a conversion. Asset or ad requests may appear, but there should be no request whose payload is your selected file. For the strongest separation, download the offline package, disconnect from the network, and open its index.html.