Merge EML to PDF: Combine Multiple Emails Into One PDF

Why You End Up With Many EML Files and Need One PDF

Email rarely arrives as one tidy file. A single case, project or dispute usually leaves you with a pile of separate .eml files: every message in a thread saved on its own, or a folder dragged out of a mail app. The person who asked for them wants one document they can read from top to bottom, file with a claim, or hand to a lawyer.

Doing that by hand means converting every email to a PDF and then joining the PDFs in some other tool, in the right order. With a few emails that is fine. With a long thread it is slow, and one wrongly placed file makes the whole timeline misleading.

Merging does it in one step. You open all the files, and the tool writes one PDF with the emails in date order. Say you saved fifteen replies from one thread: you drop all fifteen, tick one box, and get one chronological PDF.

What You Need to Merge EML Files

You need the email files themselves, saved on the device you are using. An .eml file is one email in the standard Internet Message Format, and a .msg file is Outlook's own format. The tool picks files by their ending, so the table shows what it accepts.

File size: a file larger than 50 MB is rejected, and the rest of the batch still loads.

Payment: merging needs the paid unlock (a Case Pass, Pro or Legal plan). Everything before that step is free, so you can open the files and check the previews first.

Source: RFC 5322: Internet Message Format.

How to Merge EML Files Into One PDF, Step by Step

1. Drop your files onto the box at the top of this page, or click Choose .eml or .msg files and select them all at once. You can add more files afterwards.
2. Look through the preview of each email. If one does not belong in the PDF, click Remove on its card. Pictures from the internet are not loaded by default; one click on Load images above the previews loads them for all of the emails.
3. Under Save as PDF, pick the paper size: A4 or US Letter.
4. Once two or more emails are loaded, the bulk options and the unlock box appear. Until the unlock is active, the merge box and the bulk buttons carry a lock and "Paid"; clicking one takes you to the unlock box, where the buy buttons are. After you pay you come back to the same tab and it unlocks on its own; or paste the license key from your email into Enter license key. If this browser is already unlocked, skip this step.
5. Tick Merge into one PDF, sorted by date. The box is now active.
6. Click Download merged PDF. The tool builds the PDF in your browser and saves one file called emails-merged.pdf.

Steps 1 to 3 are free and need no sign-up. If you do not want to pay, each email still has its own free Download PDF button, which gives you one PDF per email.

What the Merged PDF Looks Like

The merged file is one PDF with selectable, searchable text. This is what goes into it:

• Order: oldest email first, by each email's Date header. Emails with no date go to the end, in the order you opened them.
• One email, one start: every email after the first begins on a new page, so two emails never share a page. A long email simply runs onto the following pages.
• Header block: each email opens with its subject in large bold type, then From, To, Cc and Date lines, then a thin rule. A line is left out when the email has no value for it. Dates are shown in UTC. You can switch to your local time under More options.
• Body: the text and inline images of the email, in the paper size you chose. Remote images are included when Load images from the internet is on (it is off by default, and the page asks before it makes a PDF that would lack them), and only when the sender's server lets the browser read the picture. Pictures from servers that do not show as an "Image not loaded" box.
• Attachments: a short list under the body with each file name and its size. PDF and image attachments are added as pages right after their email; other files are listed by name only.
• Links: links in the email body stay clickable in the PDF.
• Full headers (optional): tick Add full email headers and each email is followed by a page with its complete header block (Message-ID, Received, DKIM-Signature and the rest) as searchable text.

Tested: 300 emails merged into one PDF in about 25 seconds, and 1,000 in about 80 seconds, in Chrome on a laptop. Emails with many pictures from the internet take longer.

The merged PDF starts with a contents page, and every page shows "Page x of y" in its footer. The full-headers page is a record for reference, not a forensic check, so keep the original .eml files next to the PDF. For a ZIP of separate PDFs you can tick Include original files in the ZIP to keep them together.

Bates Numbering for Email Productions

Producing emails with Bates numbers usually runs into two problems: Bates numbering is an Acrobat Pro feature, not part of Acrobat Standard, and the attachments inside an email are not numbered unless you pull them out and number them one by one.

The merged PDF does both in one pass. Type a prefix such as ABC-, and the first number if this batch continues an earlier one. Every page after the contents page gets a number: each email, its full-headers page if you added one, and the PDF and image attachments that follow it. Attachments sit right after their email and take the next numbers, so each email and its attachments stay together.

With the PDF you can download a number list (CSV): one row per email with its date, sender, subject and first and last number, and one row per attachment with its own numbers and the email it belongs to.

• The contents page has no number. Numbering starts on the first page of the first email, and the contents list shows each email's first number, so you can hand over the PDF without the contents page and the numbers still run without a gap.
• Where the number goes: alone in the bottom right corner of every page. The footer in the middle still says "Page x of y" and the email's date.
• Attachment pages shrink a little: PDF pages that come from attachments are scaled down to about 94 to 96 percent, which leaves room at the bottom for the number, so it does not sit on top of the attachment's own content.
• Other attachments: Word documents and other files that are not PDFs or images are not turned into pages, so they get no number. The number list has a row for each, marked "Not converted to pages".
• Number width: six digits (ABC-000001); if a batch goes past 999999, every number in it gets seven.
• Not e-discovery software: no TIFF images, load files or metadata fields. Keep the original .eml files.
• Nothing is uploaded: the numbering, like the rest of the PDF, happens in your browser.

Bates numbering of emails and their attachments is part of the Case Pass and the Legal plans. The Pro plan merges and exports everything else but does not number pages; see pricing for what each plan includes.

PDFs that are not emails can be numbered on any plan, free: see Bates numbering for PDFs. Drop emails and PDFs together and, with a Case Pass or Legal plan, one button numbers them in a single run.

Tested on Oct 21, 2026: 8 emails (5 real, 3 test) with 15 attachments, 28 pages, every page checked by eye.

What Is Free and What Costs Money

Merging is a paid feature; one PDF per email is not, and it has no limit on how many emails you do. If all you need is page numbers on PDFs you already have, you can add Bates numbers to your PDFs for free.

Limits When You Merge Many Emails Into One PDF

• Arabic, Hebrew and Thai text shows in the PDF page but is not searchable or copyable yet. Chinese, Japanese, Korean, Greek and Russian text is.
• S/MIME encrypted emails cannot be opened, so they cannot go into the merge. The tool has no access to the private key.
• Heavily designed emails will not look identical to the original. Multi-column layouts, background images and custom fonts can shift or be simplified.
• The order is by date only. There is no drag-to-reorder. If two emails carry the wrong Date header, they will sit in the wrong place.
• Very large batches are slow. The whole PDF is built in your browser's memory, so many emails with big images take longer, most of all on a phone. Use a computer for big batches.
• Attachments: with a Case Pass, Pro or Legal plan, PDF and image attachments are added as pages right after their email; other files are listed by name. You can also download every attachment as one ZIP, or one by one for free.

Merging EML Files Here vs Print-and-Join and Upload Converters

Print and join: this costs nothing extra if you already have the tools, and it is a reasonable choice for two or three emails; the Outlook, Gmail and Mac steps for one email are on the saving emails as PDF page. Its weak spot is the order: you place every file yourself, and the header block depends on the app that printed it.

Upload converters: these send the whole message, including attachments, to someone else's server. For contracts, HR or medical email that is often the reason people look elsewhere.

This page: the files are read locally in your browser, and the date order and the header block on every email come built in.

If you only need a PDF of one email, the free EML to PDF page does that. To read files without saving anything, use the EML viewer.