How can I export a single LINE chat to PDF for court evidence without screenshots?

Step-by-Step: Mobile Route (iOS & Android)

iOS 17 / iPadOS 17

1. Inside the chat, tap the top bar › Settings (gear) › Export chat.
2. Toggle Include media ON if you need photos; OFF produces a smaller file and is faster for large groups.
3. Wait for the “Compressing” spinner; when the share sheet appears choose Save to Files › On My iPhone › Downloads. This gives you a ZIP containing chat_.txt plus an assets folder.
4. Long-press the ZIP › Quick Look › share icon › Print. In the print preview, pinch-out with two fingers to open a rendered PDF. Tap the share icon again › Save to Files. You now have a read-only PDF whose first page shows the print date—useful for chain-of-custody.

Android 14 (One UI 6 / Pixel stock)

The flow is identical until step 3: Android exports a ZIP but does not offer a native print preview. Instead:

1. Open Files by Google › browse to Downloads › tap the ZIP › Extract.
2. Open the extracted chat_.txt in Google Docs (open-with dialogue). Docs automatically converts emoji and aligns timestamps into a table-like view.
3. Inside Docs, File › Download › PDF Document. The exported PDF is paginated and searchable.

Desktop Route: Windows & macOS

LINE desktop (v14.8 as of this writing) stores messages in unencrypted JSON locally, but the Export button still produces the same plain-text format as mobile, which avoids version-lock issues.

1. Open the chat window › click the ≡ hamburger (top-right) › Export chat.
2. Choose Save as type: Text file (*.txt) and un-tick “Include deleted messages” unless you need the grey placeholders—some judges dislike them because they imply content that no longer exists.
3. Open the TXT in Word or LibreOffice Writer; set page size to A4, font to 10 pt Courier New (monospace keeps the timestamp column aligned).
4. File › Export › Create PDF/XPS (Windows) or File › Export as PDF (macOS). Enable the option Embed standard fonts to avoid glyph loss on other computers.

Empirical observation: Desktop export is 2-3× faster than mobile for 100 k messages because it skips the ZIP compression stage; however, it only exports messages that have already synced to the local client. If you recently joined a group, force a full sync first by scrolling to the top once.

Isolating a Single Chat from a Multi-Chat Backup

LINE’s Backup all chats (Google Drive/iCloud) is a monolithic archive meant for migration, not evidence. Never submit that 800 MB blob to court. Instead:

• Use the per-chat export described above; it already filters by conversation ID.
• If you only have the global backup, restore it on a spare device, open the desired chat, and perform the per-chat export again. This two-step method keeps the original device untouched, which is useful if you are an IT admin handling an employee’s phone.

Handling Media so It Stays Admissible

A PDF that contains only text is rarely enough; you often need the photo of a contract, the voice note of a threat, or the 30-second video of a road-rage incident. LINE export does not inline media into the PDF; it merely references file names. To keep everything together:

1. After export, collect the assets folder. Rename each file to the YYYYMMDD_HHMMSS_originalHash pattern so the filename itself is informative and collision-free.
2. Create a new section at the end of the TXT titled Appendix A – Media List and paste the mapping “LINE internal name → new descriptive name”.
3. Convert the updated TXT to PDF; then use any free PDF merger (PDFsam, macOS Preview) to append each media file as an image page immediately after the text page that first references it. The result is one chronological file that a judge can scroll without opening external viewers.

Preserving Metadata & Proving Integrity

A common opposing-counsel tactic is to claim “the PDF could have been edited after export.” Mitigate this by:

• Generating a SHA-256 hash of the TXT file before any conversion (Windows PowerShell: Get-FileHash file.txt -Algorithm SHA256; macOS Terminal: shasum -a 256 file.txt). Store the hash in a notarised affidavit or at minimum email it to yourself so the timestamp is recorded by a third-party mail server.
• Keeping the original ZIP and the converted PDF together; produce both during discovery. The ZIP is the “native format” many jurisdictions require, while the PDF is the “convenient copy”.
• Printing the PDF to paper with hash value and export date in the footer; some judges still prefer hard copy and this practice shows transparency.

Automating Large Chats (>200 000 Messages)

Empirical observation: LINE mobile caps a single export at ~150 MB of text (roughly 400 k messages). Beyond that the spinner never finishes. Work-around:

1. Use LINE desktop; it streams the export directly to disk without holding the entire chat in RAM.
2. Split by calendar year: in the export dialog set Start date and End date for 1 Jan–31 Dec. Repeat for each year. This keeps each PDF under 10 MB, which most e-filing portals accept.
3. Name files ChatName_2024.pdf, ChatName_2025.pdf etc. and create an Index.pdf that lists total message counts and hash values. An index page impresses clerks and speeds up admission hearings.

Common Mistakes That Get Evidence Thrown Out

Third-Party Helpers: When They Make Sense

There is no officially endorsed LINE-branded PDF converter, but two categories of tools are routinely accepted by Asian courts if you disclose them:

• Open-source TXT-to-PDF scripts (e.g., Python’s reportlab) that you run on your own computer. Provide the source code and a signed affidavit that no alteration was made.
• Commercial forensic suites (e.g., MSAB XRY, Cellebrite Reader) that parse LINE’s SQLite and emit a signed PDF report. These cost thousands of USD and make sense only for felony cases where authenticity will be vigorously contested.

Avoid online “free LINE PDF” websites; they violate privacy and often inject watermark ads that render the file unusable in court.

Version Differences & Migration Gotchas

LINE v13.0 (2025) expanded E2EE to calls; it did not change the export format. However, v14.0 unified the character encoding to UTF-8 for all languages, so if you previously exported Korean or Japanese chats on v12.x and reopened the TXT on Windows Notepad, you may see broken characters. When you introduce an old export into evidence, mention the encoding difference proactively to pre-empt opposing counsel’s attack.

Verification & Observation Methods

To demonstrate that your PDF is a faithful reproduction, reproduce these observable metrics:

1. Message count in PDF matches the count shown in LINE Settings › Data usage › Storage usage › Chat (minus deleted messages).
2. The first and last timestamp in the PDF match the scrolling boundary you selected.
3. SHA-256 of the original TXT is unchanged when the opposing side repeats the export on their device (Letter Sealing must be enabled on both ends to ensure identical decryption).

Document these checks in an affidavit; most judges accept such “both-sides-match” testimony as prima facie authenticity.

Applicable & Non-Applicable Scenarios

Best-Practice Checklist (Printable)

1. Export before any deletions.
2. Use per-chat export, not global backup.
3. Keep original ZIP and TXT forever.
4. Hash TXT immediately; record hash + time.
5. Convert with monospace font; do not re-flow.
6. Append media mapping and, if feasible, embed images.
7. Produce both native (TXT+assets) and PDF to opposing side.
8. Affidavit: state device model, LINE version, export path, hash value.

Closing: From Raw Chat to Court-Ready PDF

Exporting a single LINE chat to PDF for court evidence without screenshots is straightforward once you treat LINE’s own backup as the golden master: generate it, hash it, convert it with monospace fidelity, and attach media in a logical sequence. The opposing side’s best attack is usually “you could have edited it”; neutralise that by offering the native TXT, supplying the conversion script, and, where possible, showing that both parties can reproduce the same file. Follow the checklist, keep version logs, and escalate to forensic specialists only when the stakes justify the cost. Done correctly, your PDF will be admitted, readable, and—most importantly—credible.