OmniViewer is a free browser-based tool for viewing files, inspecting their raw content, and reading a hex view with offsets and ASCII. It also lets users edit text files in place, including line by line in very large files, then download the edited result. Its dedicated tools cover JSON formatting and conversion, CSV tables and SQL, Markdown previews, media metadata, PDFs, and ZIP archives. The CSV viewer can sort and filter data, run SQL queries, convert, export, and split files; the site says it was tested with a 21 GB, 100-million-row file. PDF tools 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 rather than uploaded, and the tools continue working offline once the page has loaded. OmniViewer describes itself as static, with no application server, API, database, or upload endpoint. File content can be placed in a URL fragment for sharing up to 32 KB.
Who it is for
OmniViewer suits people who want to inspect or edit files in a browser, including users working with CSV, JSON, PDFs, or ZIP archives. It may also suit those who need browser-based tools that keep working offline after loading.
What is good
- Files are read in the browser and not uploaded.
- Tools continue working offline after the page loads.
- Text files can be edited in place and downloaded.
- CSV tools include sorting, filtering, SQL, and export.
What to know first
- PDF tools do not perform OCR on scanned pages.
- URL sharing is limited to content up to 32 KB.
- The PDF viewer requires a modern browser.
Verdict
OmniViewer combines file inspection and format-specific tools in a browser, with local processing and offline use after loading. Its PDF toolkit lacks OCR for scanned pages, and sharing file content through a URL is limited to 32 KB.
Compared on file viewer software
- Free plan
- Yes
- Primary access
- web
- Archive preview
- Yes
- Office file preview
- Yes
- Code file preview
- Yes
