Universal File Opener
universalfileopener.com
What it is
Universal File Opener is an offline viewer and editor for supported files on Android and Windows. Its tools cover PDFs, Office documents, spreadsheets, presentations, images, archives, text, code, data, audio, and video, with available capabilities varying by platform and format. The listing includes 214 formats, archive, Office, and code previews, and in-file search. Reading supported files is free without a file-count limit, expiry, or watermark, though individual formats have size and compatibility limits. Files are processed on the device: Android does not request INTERNET permission, and the Windows app makes no network connections of its own. The apps have no advertising, app analytics, or Krauq account requirement. Android can read English text from scans using offline OCR. Files can be opened through Android sharing or file-picker features, or Windows dialogs and drag and drop; cloud providers handle their own downloads and syncing. Android Pro costs $1.99 a month or $9.99 a year. The listed lifetime option costs $5,029.99, paid once.
Spec sheet
- What it does
- Universal File Opener reads, converts and inspects supported files in a browser and in local Android and Windows apps.Read 15 Oct 2026 · universalfileopener.com
- Platforms
- Android and Windows are available; macOS, Linux, iPhone and iPad editions are planned without an announced release date.Read 30 Sep 2026 · universalfileopener.com
- Support
- The maker lists [email protected] for support and says email is answered by a person.Read 30 Sep 2026 · universalfileopener.com
- Headquarters
- California, United StatesRead 28 Sep 2026 · universalfileopener.com
- Ads and accounts
- The apps have no advertising, app analytics or Krauq account.Read 30 Sep 2026 · universalfileopener.com
- Agent integrations
- The CLI documents setup for Claude Code, Codex, Cursor and Windsurf through stdio MCP connections with folder allow-lists.Read 15 Oct 2026 · universalfileopener.com
- Android OCR
- Android can read English text from scans using offline OCR.Read 30 Sep 2026 · universalfileopener.com
- Archive features
- ZIP, 7z, TAR variants and RAR4 can be browsed and extracted, while RAR5 and split RAR are refused and edited-archive saves are Pro.Read 15 Oct 2026 · universalfileopener.com
- Archive limit
- Classic RAR archives are supported, but RAR5 and split multi-volume archives are not supported.Read 30 Sep 2026 · universalfileopener.com
- Browser processing
- UFO Web opens local files in the browser without uploading them; a connected agent can receive file content.Read 15 Oct 2026 · universalfileopener.com
- Changelog news
- Windows version 1.6.0 dated October 6, 2026 added selectable audio tracks, subtitle loading, fullscreen video and an always-on-top mini-player.Read 15 Oct 2026 · universalfileopener.com
- CLI and MCP
- UFO CLI is a local Linux command-line tool and MCP server that returns JSON inspection results and edit receipts while preserving originals.Read 15 Oct 2026 · universalfileopener.com
- CLI limits
- Free CLI use allows 25-step batch plans, searches or reports over up to 200 files and one job at a time.Read 15 Oct 2026 · universalfileopener.com
- CLI packages
- Install options include a shell installer, npm package @krauq/ufo-cli, Debian package and a container image.Read 15 Oct 2026 · universalfileopener.com
- Company headquarters
- The privacy policy identifies Krauq LLC as based in California, United States.Read 15 Oct 2026 · universalfileopener.com
- Company legal name
- The product is published by Krauq LLC.Read 15 Oct 2026 · universalfileopener.com
- Documentation and support
- The maker publishes format references, feature guides, FAQ pages, release notes, CLI installation and agent setup documentation, with email support at [email protected].Read 15 Oct 2026 · universalfileopener.com
- Editing limits
- Android spreadsheet editing does not provide full workbook recalculation; Windows recalculates supported dependent XLSX formulas after literal-cell edits, but formula entry is unavailable.Read 30 Sep 2026 · universalfileopener.com
- File tools
- The app provides tools for documents, spreadsheets, presentations, images, archives, text, code, data, audio and video, with capabilities varying by platform and format.Read 30 Sep 2026 · universalfileopener.com
- Format coverage
- The website advertises support for 372 file types spanning documents, spreadsheets, presentations, ebooks, images, audio, video, archives, email, fonts and code.Read 15 Oct 2026 · universalfileopener.com
- Free reading
- Reading supported files is free with no file count limit, expiry or watermark, although individual formats have size and compatibility limits.Read 30 Sep 2026 · universalfileopener.com
- Image features
- The image editor has crop, adjustment, filters, markup and tools tabs, with 22 conversion targets and free metadata removal.Read 15 Oct 2026 · universalfileopener.com
- Independent launch fact
- The maker reported that the Android app had passed 10,000 downloads before the Windows launch.Read 15 Oct 2026 · reddit.com
- Integrations and sharing
- Users can open files through Android sharing or the system file picker and Windows open dialogs or drag and drop; cloud providers handle their own downloads and syncing.Read 30 Sep 2026 · universalfileopener.com
- Licence
- The Android and Windows apps use a limited personal, non-exclusive, non-transferable proprietary licence; bundled open-source components retain their own licences.Read 15 Oct 2026 · universalfileopener.com
- Limit: editor customization
- A Google Play reviewer requested more font choices for DOCX editing and more page-size options.Read 15 Oct 2026 · play.google.com
- Limit: missing integrations
- Reddit users requested cloud integrations, batch archive extraction, PDF splitting, metadata and hex views, and stronger theme customization.Read 15 Oct 2026 · reddit.com
- Limit: PDF editing depth
- Reddit feedback said the PDF editor could add text but could not directly edit or delete existing text, and users requested easier full-screen viewing.Read 15 Oct 2026 · reddit.com
- Limit: spreadsheet fidelity
- Reddit feedback reported that some Excel formulas display as formulas instead of calculated results and that complex document layouts can break.Read 15 Oct 2026 · reddit.com
- Limit: storage and formats
- Reddit users requested SD-card use when internal storage is low, MOBI support, additional page-view modes and EPUB editing.Read 15 Oct 2026 · reddit.com
- Limit: warranty
- The terms provide the software as-is and disclaim guarantees that every file will render exactly, edits will fit every workflow or recovery will succeed.Read 15 Oct 2026 · universalfileopener.com
- Maker location
- Krauq LLC identifies itself as being in California, United States.Read 30 Sep 2026 · universalfileopener.com
- Media features
- Audio and video operations are mainly lossless remuxes; there is no general transcoder, compressor or media format converter.Read 15 Oct 2026 · universalfileopener.com
- Office editing
- Word, spreadsheet and presentation editors provide native-style canvases, but editing and saving capabilities vary by format and platform.Read 15 Oct 2026 · universalfileopener.com
- Offline privacy
- Files are processed on the device; Android does not request INTERNET permission and the Windows app makes no network connections of its own.Read 30 Sep 2026 · universalfileopener.com
- PDF features
- PDF tools include markup, in-place text editing, offline OCR, form filling and signatures, with most other PDF saves requiring Pro.Read 15 Oct 2026 · universalfileopener.com
- Planned platforms
- macOS, Linux desktop, iPhone and iPad editions are described as planned without announced release dates or prices.Read 15 Oct 2026 · universalfileopener.com
- Praise: broad offline handling
- Reddit users reported fast opening of PDFs, DOCX, XLSX and VCF files with layouts retained, plus an intuitive ribbon and desktop-like offline editing.Read 15 Oct 2026 · reddit.com
- Praise: offline all-in-one toolkit
- A Google Play reviewer praised the app as an all-in-one opener, editor, scanner and converter with broad document and image support, fast OCR, redaction and fully offline operation.Read 15 Oct 2026 · play.google.com
- Praise: privacy and payment
- Another Google Play reviewer highlighted the lack of INTERNET permission, support for roughly 209 formats and the option of a single payment instead of a subscription.Read 15 Oct 2026 · play.google.com
- Privacy design
- Android removes INTERNET and ACCESS_NETWORK_STATE permissions, while Windows makes no network connections of its own; files, drafts and caches remain local.Read 15 Oct 2026 · universalfileopener.com
- Rating on Google Play
- 4.1 out of 5 from 132 reviewsRead 15 Oct 2026 · play.google.com
- System requirements
- Android requires version 8.0 or later; Windows requires Windows 10 version 1809 or later on x64; the CLI requires Linux x86_64 with glibc 2.35 or newer.Read 15 Oct 2026 · universalfileopener.com
- Text and data tools
- Text and code files support syntax highlighting, find-and-replace and multiple encodings; JSON has a tree view and SQLite tables are browsable.Read 15 Oct 2026 · universalfileopener.com
Plans and prices
Free Free unlimited reading · no expiry · no watermark · no ads · no account Read 15 Oct 2026 · universalfileopener.com
Android Pro monthly $1.99 a month monthly all Android Pro editing and conversion saves · auto-renewing subscription Read 15 Oct 2026 · universalfileopener.com
Android Pro Monthly $1.99 a month Subscriptions renew automatically unless cancelled in Google Play. Same Android Pro features as annual and lifetime · eligible monthly subscribers get 14 days free, then US$0.99/month for 3 months, then US$1.99/month Read 30 Sep 2026 · universalfileopener.com
Android Pro annual $9.99 a year billed annually all Android Pro features · platform-specific entitlement Read 15 Oct 2026 · universalfileopener.com
Android Pro Annual $9.99 a year Billed annually Same Android Pro features as monthly and lifetime · no trial Read 30 Sep 2026 · universalfileopener.com
Android Pro lifetime $15, paid once 50% off regular US$29.99 same Android Pro features · lifetime access · no recurring charge Read 15 Oct 2026 · universalfileopener.com
Windows Pro introductory $19.99, paid once introductory price through August 28, 2027; regular US$39.99 lifetime Windows Pro · future Windows updates included Read 15 Oct 2026 · universalfileopener.com
UFO CLI organizations up to 50 people $99 a month monthly; annual option US$990 commercial license · higher batch/search/job limits · one organization license Read 15 Oct 2026 · universalfileopener.com
Android Pro Lifetime $5,029.99, paid once One time Lifetime access to Android Pro features · Google Play shows the local lifetime offer before purchase Read 30 Sep 2026 · universalfileopener.com
Windows Pro Price not published One payment; lifetime Windows Pro with future Windows updates included. Windows edition only · introductory price active until August 28, 2027 at 11:59 PM UTC Read 30 Sep 2026 · universalfileopener.com
Strong points and limits
Strong points
- Reading supported files has no file-count limit
- Files are processed on the device
- No ads, app analytics, or app account
- Offline OCR reads English text in scans
Limits
- Individual formats have size and compatibility limits
- Spreadsheet editing has recalculation limits
- RAR5 and split multi-volume archives are unsupported
Who it suits
Universal File Opener suits people who need to read supported files offline on Android or Windows. Android users who need English scan text recognition can use its offline OCR.
Universal File Opener in depth
Read the full write-up
Overview
Universal File Opener is a file viewer and editor for supported documents and media on Android and Windows. It suits people who regularly receive a mix of file types and want to read them without an account or a per-file cap. Its broad reach is most persuasive for viewing; editing support varies, so it is less convincing as a single tool for specialist workflows.
Key features
Broad file coverage, uneven editing
The app supports 214 formats across documents, spreadsheets, presentations, images, archives, text, code, data, audio and video. That range can reduce the need to switch apps just to inspect a file, but it does not mean every format can be edited: capabilities depend on platform and file type. Office and code previews, archive preview and in-file search help with inspection.
Android’s offline OCR reads English text from scans, useful for extracting readable text without a connection. Spreadsheet editing is more limited. Android does not recalculate a full workbook; Windows recalculates supported dependent XLSX formulas after edits to literal cells, but cannot enter formulas. If spreadsheet calculation or formula authoring is central to your work, choose a dedicated spreadsheet application.
On-device processing and file access
Files are processed on the device. Android requests no INTERNET permission, and the Windows app makes no network connections of its own; neither app has ads, app analytics or a Krauq account. That is a strong arrangement for offline access and avoiding an app account, though cloud downloads and syncing are handled by the cloud provider, not the app.
Opening files fits standard platform workflows: Android sharing and the system file picker, or Windows open dialogs and drag and drop. Supported files can be read free without a file-count limit, expiry or watermark, but individual formats still have size and compatibility limits.
Archive compatibility
Classic RAR archives work, but RAR5 and split multi-volume archives do not. Users who routinely receive newer or split RAR archives should not rely on this as their only archive tool.
Pricing
The Free plan costs nothing and covers reading supported files without a file-count limit, expiry, watermark, ads or app account. It is a substantial option for people who mainly inspect files; format size and compatibility limits still apply.
Android Pro Monthly costs $1.99 a month, with the same Android Pro features as the annual and lifetime plans. Eligible monthly subscribers get 14 days free, then US$0.99/month for 3 months, then US$1.99/month. Subscriptions renew automatically unless cancelled in Google Play, so this suits users wanting a short commitment who are willing to manage renewal.
Android Pro Annual costs $9.99 a year, billed annually, and includes the same Android Pro features, with no trial. It is the lower-commitment-cost option for someone who expects to use Pro through the year. Android Pro Lifetime costs $5,029.99, paid once, a one-time purchase for lifetime Android Pro access; Google Play shows the local lifetime offer before purchase. That unusually high listed price makes the monthly or annual option easier to justify for most users.
Windows Pro is a one-payment purchase for lifetime Windows Pro, with future Windows updates included. It is Windows edition only, and its introductory price is active until August 28, 2027 at 11:59 PM UTC; the price is custom pricing.
Platforms
Universal File Opener runs on Android and Windows, with mobile as its primary access platform. It is not a cross-platform option for people who need the same app on iOS, macOS or Linux. Editing and format support also differ between Android and Windows, particularly for spreadsheets.
Who it's for
It is a good fit for people who need broad, offline file viewing on Android or Windows, especially when free reading without account creation or file-count limits is the priority. It is a weaker choice for spreadsheet-heavy work, RAR5 or split archive handling, or anyone requiring consistent capabilities across mobile and desktop.
Pros and cons
Pro: Free reading has no file-count cap, expiry or watermark, making it practical for occasional and regular file inspection.
Pro: On-device processing, no app account, ads or analytics, and no app-originated Windows network connections support offline use.
Pro: 214 supported formats and built-in previews cover a broad mix of incoming files.
Con: Format and editing capabilities vary by platform, so broad coverage does not guarantee a usable editing workflow for every file.
Con: Spreadsheet recalculation and formula entry are constrained, particularly on Android.
Con: RAR5 and split multi-volume archives are unsupported.
Alternatives
File Viewer Software is the broader category to compare if you want to weigh file-viewer options before settling on one app.
Choose ViewAnyFile.app if wider platform coverage matters: it is free and supports Android, iOS, Linux, macOS, web and Windows. Okular is a free alternative for Linux, macOS and Windows users who want a GPLv2+ option.
Universal Viewer is another Windows-only freemium choice, with a free edition and a Pro plan. XnConvert is worth considering for Linux, macOS or Windows users seeking a freemium option with a free license for private, educational and nonprofit use.
OmniViewer is a free option for Linux, macOS, web and Windows. Polaris Viewer Plus may suit readers seeking broader mobile and desktop coverage across Android, iOS, macOS, web and Windows, though it is freemium without a free plan.
Geeqie is a free GPLv2 option for Linux, macOS and Windows. HFSExplorer is another free GPLv3 option for those platforms.
Verdict
Choose Universal File Opener if you want wide-ranging, offline file reading on Android or Windows without an account, ads or a reading cap. Its strongest reason to choose it is the combination of broad viewing support and genuinely unrestricted free reading. Look elsewhere if spreadsheets are a core part of your workflow, if you need RAR5 or split archives, or if you need an app for platforms beyond Android and Windows.
Verdict
Universal File Opener pairs broad file viewing with on-device processing and unrestricted free reading of supported files. Check format and platform limits, particularly for spreadsheet editing and archive types, before relying on it for a specific workflow.
Where Specifiction places it
- File Viewer Software#1 of 318.7
Alternatives to Universal File OpenerAll alternatives →
Okular Free plan 8.4 Visit