1. Add the export

WhatsApp: Export Chat. Telegram Desktop: export the chat history as JSON. Otherwise a CSV with timestamp, sender and message columns.

Drop the export here, or choose it .txt or .zip from WhatsApp, result.json from Telegram, or a .csv. Several files from the same conversation are merged in time order.

Dates in the export are month first (US phones write 3/14/26 for 14 March)

2. What the export contains

Add an export to see the period, participants, busiest days and gaps.

3. Choose what goes in

From date

To date

Keywords to highlight (comma separated)

Include only messages that contain a keyword

No messages loaded.

The first 40 selected messages are previewed here.

4. Write the transcript

Title

Matter or reference (optional)

Number the PDF into an evidence binder with EXHIBIT, or seal it with PROOF.

How it works

Screenshots of a conversation are easy to question. DOSSIER turns a WhatsApp, Telegram or CSV chat export into one PDF transcript: a cover page with the export file's SHA-256 fingerprint, then every message numbered with its timestamp and sender, with keyword filters if you only need part of it. It is built for evidence and disputes, where showing the messages are what they claim to be matters. The export is read in your browser.

Doing this often? OBSCURA Case keeps transcripts like this with the rest of the evidence, tagged, searchable and produced with Bates numbers. On its own, US$4 a month; with everything else, US$9 a month or US$79 a year. 7 days free.

A chat export, turned into a numbered transcript DOSSIER

1. Add the export

2. What the export contains

3. Choose what goes in

4. Write the transcript