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OmniViewer

OmniViewer is a free browser-based file viewer for inspecting files and using format-specific tools.

Place
#20 of 31
Score
5.9
OmniViewer's website

What OmniViewer is

OmniViewer is a free browser-based file viewer for inspecting files and using format-specific tools. It can display raw content and a hex view with offsets and ASCII, and lets you edit text files in place—including line by line in very large files—then download the result. Its tools cover JSON formatting and conversion, CSV tables and SQL, Markdown previews, media metadata, PDFs and ZIP archives. The CSV viewer offers sorting, filtering, SQL queries, conversion, statistics, export and splitting; the site says it was tested with a 21 GB, 100-million-row file. PDF tools can extract text and images, inspect or remove metadata, and open password-protected files, but do not perform OCR on scanned pages. Files are read in the browser, and tools keep working offline after the page has loaded. The site describes the service as static, without an application server, API, database or upload endpoint. A URL can share file content in its fragment for files or snippets up to 32 KB. It runs in modern browsers on Linux, macOS, Windows and phones.

Good

  • Free plan and browser access.
  • Edits text files in place and downloads results.
  • CSV tools include sorting, filtering, SQL and splitting.
  • Continues working offline after the page loads.
  • PDF tools include text and image extraction.

Watch out

  • PDF tools do not OCR scanned pages.
  • URL sharing is limited to content up to 32 KB.
  • Files cannot be shared through URLs above that limit.

Who it suits

OmniViewer suits people who want to inspect, edit or convert files in a browser, including those working with large CSVs or PDFs. It may also fit users who need browser-based tools to continue working offline after loading the page.

Verdict

OmniViewer combines raw and hex file viewing with dedicated tools for formats such as CSV, PDF and ZIP. Note the lack of OCR for scanned PDFs and the 32 KB limit on URL-based sharing.

The facts

Each one read from OmniViewer's own pages, with the date it was checked.

What it does

Analytics
OmniViewer uses Google Analytics and says it sends the page path, but not the URL query or fragment or file contents.checked 3 Oct 2026
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.checked 2 Oct 2026
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.checked 3 Oct 2026
Editing
Users can edit text files in place and download the result, including line-by-line editing for huge files.checked 3 Oct 2026
File sharing
Files or snippets up to 32 KB can be shared in a URL whose payload is stored in the URL fragment.checked 3 Oct 2026
File viewer
OmniViewer is a browser-based file viewer that displays raw content and a hex view with offsets and ASCII.checked 2 Oct 2026
Format tools
Dedicated toolkits include JSON, JSON Lines, CSV, HTML, Markdown, MDX, YAML, XML, JavaScript, MP3, MP4, and PNG viewers.checked 3 Oct 2026
Integrations
The site says OmniViewer uses the same engine as fastjsonviewer.com and hugecsv.com.checked 3 Oct 2026
Large files
The site says file size is effectively unlimited and cites a 40 GB in-browser test of the same viewing engine.checked 3 Oct 2026
Local processing
The site says files are read by the browser and never uploaded to a server.checked 3 Oct 2026
No backend
The site describes itself as static, with no application server, API, database, or upload endpoint.checked 2 Oct 2026
Offline use
The site says OmniViewer works fully offline once loaded.checked 3 Oct 2026
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.checked 2 Oct 2026
Product
OmniViewer is a universal file viewer that runs in the browser and shows raw content and a hex view.checked 3 Oct 2026
Sharing limit
The toolbar can create a URL containing file content in its fragment for content up to 32 KB.checked 2 Oct 2026
Supported computers
The PDF viewer works in a modern browser on Windows, Linux, macOS, or a phone, with no additional software required.checked 2 Oct 2026
ZIP tools
The ZIP viewer lists archive contents, previews or downloads individual entries, and can extract selected files.checked 3 Oct 2026

Where it runs

Platform support
The PDF viewer says it works in modern browsers on Windows, Linux, macOS, or a phone.checked 3 Oct 2026

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