Clean Viewer Privacy Policy
Effective: September 26, 2026 | Last updated: November 12, 2026 · The Korean version (/privacy) prevails and keeps the full change history.
Clean Viewer (the "app") is a document viewer made by Sequencen Inc. (the "company"). We follow the Korean Personal Information Protection Act and the laws that apply where you use the app.
In short: no sign-up, no name, phone number or email collected. Documents you open are shown only on your device and are not sent to the company. No ads and no usage-tracking tools.
1. What we collect
| Item | What | When |
|---|---|---|
| Account | None — there is no sign-up or login | — |
| Documents you open (PDF, photos, text, Hangul, Word, Excel, PowerPoint) | Never sent to the company — opened only on your device | — |
| Recent documents | File name, type, the app it came from, time opened, star, your label, last page and zoom, your highlights and notes — the file itself is not recorded | Kept only on your device after you open a document |
| Crash note | App version, Android version, time, error type and code location — no document name, content or error text | Kept only on your device; sent only if you choose "Report by email" (opens your own mail app) |
The current Android app does not request the internet permission at all, so it cannot send documents or device information anywhere, and it creates no device ID.
2. Web viewer (clean-viewer.vercel.app/view)
- Files open only inside your browser. Printing and "Save as PDF" use your browser on your device. "Send to another app" opens your device's share sheet and only the app you choose receives the file.
- Opened files are not stored. Only if you turn on "Remember recent documents on this device" does the browser keep up to 10 recent files (plus up to 5 starred) in its own storage on your device. Turning it off deletes them.
- Passwords for protected Office files are used only on your device to open the file and are never stored or sent.
- "Take photos with camera" in a phone browser asks for the browser's camera permission and finds and shoots the paper inside this screen. The camera is used only while the shooting screen is open, and is turned off right away when you close it, go to another screen or app, or the phone screen turns off. It is also turned off after 30 seconds without a photo. The camera image is never sent off the device. If you decline, you can still use your phone's camera app (inside KakaoTalk the camera app is used from the start). The microphone and location are not used.
- To work offline, the viewer stores its own program parts (screens, document readers, PDF engine, text-recognition parts) in the browser.
3. What stays on your device and when it is deleted
- Copies of documents received from other apps, and photos taken for a paper scan — deleted automatically after 24 hours (cleaned up when the app starts). The current app has no server conversion, so it keeps no converted PDFs.
- Scans you save with "Save as photos" — only when you tap it; on Android 10 or later they go to your gallery's "Pictures/클린뷰어" folder (below Android 10, the share sheet opens). They are your photos, so they stay until you delete them, even after uninstalling the app.
- Recent documents — deleted after 30 days (starred ones stay until you remove them, up to 5). You can delete one or all at any time.
- Saved signature or stamp — only if you turn on "Remember", until you delete it (off by default).
- First-page thumbnails of recent documents and the list of folders you picked in "My folders" (names, sizes, dates only) — on your device only; you can turn them off and delete them in Settings.
The company cannot see any of these. Uninstalling the app removes them all (scans you saved to your gallery stay, as they are your photos).
4. Permissions
The current app requests no permissions — not internet, storage, photos, camera, location or contacts. It opens only the files you pick. For a paper scan it asks your phone's camera app to take the photo and receives only that photo (any copy the camera app keeps follows that app's settings). "Save as photos" puts scans in your gallery without a storage permission (Android 10 or later).
Scanning in the app uses the document scanner component of Google Play services; the photos you take are processed only on your phone and are not sent to any server. On phones without Google Play services, the app uses your phone's camera app as described above.
When you turn on "Read and add text" in the app, Google Play services downloads a text-reading component (Korean) to your phone the first time. Text is read only on your phone, and your photos and document contents are not sent anywhere. If Google Play services is unavailable or the component can't be downloaded, the PDF is made without text.
Printing and Read aloud in the app use your phone's print and speech features. If your phone's speech engine picks an online voice, that company's server may be used (nothing is sent to our server).
5. Sharing and processors
We do not share your information. We store no documents, so there is nothing to hand over even to authorities.
| Processor | Task | |
|---|---|---|
| Vercel Inc. (USA) | Delivers the web pages (clean-viewer.vercel.app). Access logs created when you visit (IP address, time, browser) are kept briefly under Vercel's policy. Documents are never sent — they open inside your browser. Not applicable to the installed app. | |
| One edit record inside a new copy you saved after fixing text (“클린뷰어에서 글을 고침” — “edited in Clean Viewer” — and the date, in the document properties of the Word or PDF copy · only when you fix text and save a new copy) | As long as that copy exists — the original file is not changed · this record is not sent to us | To state honestly inside the file that it is an edited copy (the recipient can see it in the document properties) |
| Paragraph text you fixed but did not save yet in Fix text (one set, for the last document you were fixing · no file name kept) | Deleted after 7 days — deleted at once when you save, choose to discard, or use “Clear everything on this device” · stays on this device only · not sent to us | So you don't lose your fixes if the app is closed (opening the same document again asks “Continue where you left off?”) |
6. Ads and analytics
There are no ads and no ad or analytics SDKs.
7. Your rights
- We keep no personal information about you, so there is nothing to access or delete on our side.
- Data on your device can be removed with "Clear all data on this device" in the app's Recent tab (recent documents history, preview images, saved signatures, stamps, your info, your folder list, copies of received files and view settings · the web viewer has a button with the same name), by uninstalling the app, or via Settings → Apps → Clean Viewer → Storage → Clear data. "Clear list only" clears just the recent documents list. Your original files and photos saved to the gallery are not removed.
- Questions are answered within 5 business days.
8. Children
The app can be used at any age and collects no personal information from anyone.
9. Privacy officer
Jongsun Yang (CEO) · ceo@sequencen.com · +82 1566-3020 · reply within 5 business days
10. Changes
If the law or the app changes, we update this policy and announce it here and in the app first.
- 2026.11.08: Web viewer "Take photos with camera" — shoots inside this screen with the phone browser's camera permission (only while the shooting screen is open · turned off right away when you close it or leave · turned off after 30 seconds without a photo · the camera image never leaves the device · no microphone or location)
- 2026.11.06: "Read and add text" in the app's scan — the text-reading component is downloaded through Google Play services (text is read only on your phone · document contents are not sent · without the component, the PDF is made without text) · Section 4 now notes that an online voice picked by your phone's speech engine may use that company's server · Wording that documents "never leave" or "stay on" your device narrowed to match the Korean version (not sent to the company)