For paralegals, small-firm litigators, and in-house counsel
Export Gmail emails for legal discovery
When a matter requires producing responsive emails from a Gmail account, the workflow varies wildly by firm size. Large firms often route everything through a managed e-discovery platform with Bates numbering, native-format preservation, and chain-of-custody affidavits baked in. Smaller matters — internal investigations, single-custodian collections, or a quick pre-litigation review — often need something simpler: an offline, reviewable PDF set of the responsive threads, attachments intact, that counsel can read on a plane.
ThreadPDF is built for that simpler case. It's a Chrome extension that exports the Gmail threads you select to PDF, ZIPs the original attachments alongside, and runs entirely on the reviewer's machine. It's not an e-discovery platform, and it doesn't replace one. What it does is take the manual "print each thread to PDF" loop and turn it into a single search-and-select operation against the live Gmail UI you're already searching from.
How to export responsive Gmail threads with ThreadPDF
- 1
Have the custodian install the extension
ThreadPDF runs in the custodian's Chrome and reads from the live Gmail UI. Install is the standard Chrome Web Store flow — no admin install required for a single-custodian collection, though IT can also push it via Workspace if the matter is internal.
- 2
Build the responsive search in Gmail
Gmail's native operators are your filter: from:(opposing-counsel-domain.com), label:Hold, subject:(matter-codename OR project-codename), or date-bounded after:2024/01/01 before:2025/12/31. Document the exact query — it becomes part of the production memo.
- 3
Select the responsive threads
Review the search results and select threads with the row checkboxes. ThreadPDF only exports what you've selected, so non-responsive results stay out of the production set.
- 4
Export to PDF with attachments
In the ThreadPDF dialog, choose PDF as the output format and enable attachments. Each thread renders to one PDF preserving sender, recipient, date, headers, and the full message body; original attachments ship in a ZIP.
- 5
Hand off to review counsel
The output folder is a flat set of PDFs plus the attachments ZIP. Drop it into your review platform or counsel's encrypted shared drive for tagging, Bates stamping, and privilege review.
What this looks like in practice
A solo litigator running a one-custodian collection for a pre-litigation matter might end up with the folder below before handing it to outside counsel for Bates numbering.
Gmail search (documented in the production memo):
label:Hold-MatterX (from:@opposing-corp.com OR to:@opposing-corp.com) after:2024/06/01
Export result:
matter-X-responsive/
threads/
2024-06-12_smith-jones_initial-proposal.pdf
2024-07-03_jones_revised-terms.pdf
2024-07-19_smith_signed-counterproposal.pdf
2024-09-04_smith-internal_status-update.pdf
...
attachments.zip
2024-06-12_proposal-v1.pdf
2024-07-03_redline-revised.docx
2024-07-19_executed-counterproposal.pdf
...
Each thread PDF includes:
- Full sender / recipient / Cc / Bcc / date headers on every message
- The complete message body (no truncation)
- Reply chains rendered top-to-bottom in chronological order- ThreadPDF doesn't apply Bates numbers itself — that's a step downstream in the review tool.
- Original attachments ship in their native formats inside the ZIP so review counsel can re-render or hash them as needed.
- If the matter requires merging the entire production into a single PDF, that's on the ThreadPDF roadmap; today the export is per-thread.
Why ThreadPDF for discovery-adjacent workflows
On-device processing — emails don't leave the custodian's machine
ThreadPDF processes everything in the Chrome tab. There is no server-side conversion step, no vendor cloud, and no third-party account in the chain of custody between the Gmail UI and the output PDF.
Originals preserved alongside the rendered PDF
The attachment ZIP keeps every file in its native format with its original filename. The rendered PDF gives review counsel something readable; the ZIP gives them the original artifact if hashing or native-format production becomes necessary.
Auditable, simple workflow for small matters
The query you ran in Gmail and the set of threads you checked are the only inputs. That's easy to document in a production memo: query, date stamp, count of threads exported. No black-box transformation in the middle.
Get the responsive set into PDFs in one pass
Install ThreadPDF on the custodian's Chrome and run the search. The Pro plan is $4.99/month for unlimited exports — usually cheaper than an hour of paralegal time.
Install ThreadPDF