Convert EML to MHT lets you turn one or more .eml email files into single‑file .mht web archives. The conversion preserves the original message headers, HTML body (with CSS) and any inline images, bundling them so the resulting file displays offline with full fidelity. ⧉ Scope: only .eml‑to‑.mht conversion is supported; other formats are not processed.

Message headers are retained

All standard email headers (From, To, Cc, Subject, Date) are copied into the resulting .mht file. They appear twice: once as the top‑level metadata of the .mht container, which many viewers show in the file‑properties dialog, and again as a printable block at the beginning of the rendered body.

If the source email contains a Bcc header, the Bcc data is kept in the internal metadata of the .mht file but is not displayed in the printable header block, matching how most email clients hide Bcc recipients while preserving the information for archival completeness.

HTML body and styling stay intact

The original HTML body is transferred without alteration, preserving inline CSS, style attributes, tables, divs, lists and other structural markup. When the .mht file is opened in a web‑archive‑aware viewer, the visual layout (colors, fonts, spacing) matches the original email exactly.

When the source email contains only plain‑text, the converter wraps the text in a simple HTML container so the .mht still displays correctly. No artificial formatting is added; line breaks and spacing are retained exactly as typed.

Inline images and other attachments are bundled

Images embedded in the email (CID, base64 or attached resources) become separate parts inside the .mht container, allowing them to render offline without an internet connection. External image URLs are left unchanged; the viewer will attempt to fetch them at open time, reproducing the original behavior.

All binary attachments—including PDFs, ZIP archives, additional images, and calendar invitations—are stored as extra parts within the .mht file. Viewers that understand .mht attachments (e.g., Outlook for Windows) expose them for download, while viewers that render only the body simply ignore them without affecting the displayed message.

Limits and scope

Batch handling: Accepts one upload containing one or more .eml files; each file is converted to a separate .mht, and multiple results are delivered together in a .zip archive.
Retention period: The generated download link stays valid for 24 hours after the conversion completes, after which the files are removed.

How to convert EML to MHT

STEP 1

Upload your file

Click inside the file drop area to upload your files or drag & drop them.

STEP 2

Convert

Click on the "Convert" button. Your files will be uploaded and converted immediately.

STEP 3

Download

Download link of converted MHT files will be available instantly after conversion.

STEP 4

Feedback

Check conversion results and send us your feedback.

FAQ

Are the original email headers included in the generated .mht file?

Yes, all standard headers (From, To, Cc, Subject, Date) are copied into the .mht archive both as top‑level metadata and as a printable block at the top of the rendered body; Bcc is kept only in the internal metadata.

Do inline images stay embedded for offline viewing?

Yes, images embedded in the source email are bundled as separate parts inside the .mht file, allowing them to render without an internet connection.

What happens to binary attachments such as PDFs or ZIP files during conversion?

Binary attachments are preserved inside the .mht archive; viewers that understand .mht attachment parts (e.g., Outlook for Windows) expose them for download, while viewers that only render the body ignore them.

What file‑size or batch limits apply to the EML → MHT conversion?

Uploads may include multiple .eml files, but the total size is limited by your account tier: anonymous users have the smallest cap, a free Aspose account raises it, and paid tiers allow larger batches. Exact limits are shown on the pricing page.

How long are the converted files retained for download?

The download link for the generated .mht (or .zip) remains active for 24 hours after conversion; after that the files are automatically deleted.

EML to MHT

Self-contained .mht archive that preserves email headers, body formatting, and inline images in a single file.