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Email Diagnostic Suite

Email Source Decoder

Turn encoded MIME into readable subject, from and body previews — locally.

Privacy-first — email content is parsed in your browser. DNS lookups (if used) go to Cloudflare DoH for domain records only — never your message body.

Tip: drag & drop a .eml or .txt file. MSG binary is not supported — paste extracted headers or use EML.

Tool Options

Results

Results will appear here…
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How It Works

Email diagnostics for admins, security teams and Softaken users.

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Paste or upload

Paste headers/EML or drop a .eml/.txt file. Message content stays on your device.

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Analyze locally

Parse MIME, authentication and routing in the browser. DNS tools use Cloudflare DoH only for record lookups.

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Export report

Copy, download TXT/CSV/JSON or print a PDF from your browser.

Email content stays in the browser. DNS tools only query public records via DoH.

About Email Source Decoder

Decode quoted-printable, Base64 and RFC2047 encoded subjects, From headers and body parts. Preview plain text and simple HTML in your browser. Part of FreeConverter’s Email Diagnostic Suite for Outlook, Exchange, Gmail and IMAP troubleshooting.

FAQs

No. Header and MIME analysis run entirely in your browser. FreeConverter servers never receive your email content.

Those tools query Cloudflare DNS-over-HTTPS from your browser. Only the domain (and DKIM selector) are sent to Cloudflare — not the email body.

Yes. FreeConverter.app browser email diagnostic tools are free to use.