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Dev tools · August 17, 2026

Online File Viewer

Free, browser-based viewer for Markdown, CSV, HTML and more

What it does

Free online viewer for Excel, CSV, JSON, YAML, Markdown and HTML. Open several files at once in tabs, with search, column statistics and a JSON formatter.

Free online viewer for Excel, CSV, JSON, YAML, Markdown and HTML. Open several files at once in tabs, with search, column statistics and a JSON formatter. No upload.

Translating sends this document's text to Google Translate. Nothing is sent until you pick a language. Online File Viewer is a free, browser-based viewer for the files you most often need to read but not edit: Excel spreadsheets, CSV, JSON, YAML, Markdown and HTML. Paste your text or drop a file and it detects the format automatically — spreadsheets become a sortable table, JSON becomes a collapsible tree you can format or minify, Markdown renders as formatted text, and HTML previews safely in a sandbox. You can open several files at once: each one gets its own tab, so you can switch between a spreadsheet, a config file and a README without losing your place. A document in a language you do…from online-file-viewer.github.io

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