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SPECIFICTION
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OmniViewer

omniviewer.org

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Spec score 7.1 #23 of 31 in File Viewer Software

What it is

OmniViewer is a free browser-based file viewer and set of format tools. It displays raw file content and a hex view with offsets and ASCII, and allows text files to be edited in place and downloaded. Its tools include JSON formatting and conversion, CSV tables and SQL, Markdown preview, media metadata, PDF extraction and metadata controls, and ZIP archive browsing. The CSV viewer supports sorting, filtering, SQL queries, conversion, statistics, export, and splitting; the site says it was tested with a 21 GB, 100-million-row file. OmniViewer says its viewing engine was tested with a 40 GB file. Files are read in the browser rather than uploaded, and tools continue to work offline after the page has loaded. The site describes the service as static, with no application server, API, database, or upload endpoint. PDF tools can extract text and images, inspect or remove metadata, and open password-protected PDFs, but do not perform OCR on scanned pages. A URL can carry file content in its fragment for content up to 32 KB. It works in modern browsers on Windows, Linux, macOS, or a phone.

Spec sheet

Product
OmniViewer is a universal file viewer that runs in the browser and shows raw content and a hex view.Read 3 Oct 2026 · omniviewer.org
Integrations
The site says OmniViewer uses the same engine as fastjsonviewer.com and hugecsv.com.Read 3 Oct 2026 · omniviewer.org
Analytics
OmniViewer uses Google Analytics and says it sends the page path, but not the URL query or fragment or file contents.Read 3 Oct 2026 · omniviewer.org
CSV capacity
The CSV viewer offers sorting, filtering, SQL queries, export, and splitting, and the site says it was tested with a 21 GB, 100-million-row file.Read 2 Oct 2026 · omniviewer.org
CSV tools
The CSV viewer offers a sortable and filterable table, in-browser SQL, conversion, statistics, export, and splitting; the site says it was tested with 21 GB and 100 million rows.Read 3 Oct 2026 · omniviewer.org
Editing
Users can edit text files in place and download the result, including line-by-line editing for huge files.Read 3 Oct 2026 · omniviewer.org
File sharing
Files or snippets up to 32 KB can be shared in a URL whose payload is stored in the URL fragment.Read 3 Oct 2026 · omniviewer.org
File viewer
OmniViewer is a browser-based file viewer that displays raw content and a hex view with offsets and ASCII.Read 2 Oct 2026 · omniviewer.org
Format tools
Dedicated toolkits include JSON, JSON Lines, CSV, HTML, Markdown, MDX, YAML, XML, JavaScript, MP3, MP4, and PNG viewers.Read 3 Oct 2026 · omniviewer.org
Large files
The site says file size is effectively unlimited and cites a 40 GB in-browser test of the same viewing engine.Read 3 Oct 2026 · omniviewer.org
Local processing
The site says files are read by the browser and never uploaded to a server.Read 3 Oct 2026 · omniviewer.org
No backend
The site describes itself as static, with no application server, API, database, or upload endpoint.Read 2 Oct 2026 · omniviewer.org
Offline use
The site says OmniViewer works fully offline once loaded.Read 3 Oct 2026 · omniviewer.org
PDF support
The PDF toolkit can extract text and images, inspect and remove metadata, and open password-protected PDFs; it does not perform OCR on scanned pages.Read 2 Oct 2026 · omniviewer.org
Platform support
The PDF viewer says it works in modern browsers on Windows, Linux, macOS, or a phone.Read 3 Oct 2026 · omniviewer.org
Sharing limit
The toolbar can create a URL containing file content in its fragment for content up to 32 KB.Read 2 Oct 2026 · omniviewer.org
Supported computers
The PDF viewer works in a modern browser on Windows, Linux, macOS, or a phone, with no additional software required.Read 2 Oct 2026 · omniviewer.org
ZIP tools
The ZIP viewer lists archive contents, previews or downloads individual entries, and can extract selected files.Read 3 Oct 2026 · omniviewer.org

Strong points and limits

Strong points

  • Files are read in the browser, not uploaded.
  • Tools work offline after the page loads.
  • Text files can be edited and downloaded.
  • CSV tools include filtering, SQL, export, and splitting.
  • Supports Windows, Linux, macOS, and phones.

Limits

  • PDF tools do not perform OCR on scanned pages.
  • URL sharing is limited to content up to 32 KB.
  • Analytics sends page paths to Google Analytics.

Who it suits

OmniViewer suits people who want to inspect or edit files in a browser, including CSV, PDF, JSON, Markdown, and ZIP files. Its offline operation after loading may help users who need to continue without a network connection.

Verdict

OmniViewer combines file viewing and format-specific tools in the browser, with offline operation after loading. Note the absence of scanned-page OCR and the 32 KB limit for content embedded in share URLs.

Where Specifiction places it

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