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DataViewer is an online file viewer and lightweight data analysis platform. Its free offering focuses on viewers for 35+ file formats, covering CSV, JSON, Excel, SQLite, Parquet, DBF, GeoJSON, KML, KMZ, GPX, Shapefile, STL, OBJ, GLTF, DOCX, Markdown, SVG, HEIC, DICOM, XML, YAML, TOML, HAR, Avro, and more. Its main selling point is that the free viewers process files locally in the browser, with no server upload and no account required.
From a developer-tooling perspective, it is more of a “file inspection bench” than a full IDE plugin or data platform. Useful features for developers include tree views for JSON/XML/YAML/TOML, HAR analysis, SQLite browsing, Parquet/Avro schema inspection, and viewing YouTube API JSON responses. For GIS use cases, it supports map display with Leaflet and OpenStreetMap. Chart-based analysis in Workspace uses Chart.js and ECharts. Workspace also offers data profiling, statistics, pivot tables, PDF reports, export, embedded analytics, and saved views; the Business tier adds AI insights and chat-based analysis.
The free plan is 0 EUR and is suitable for viewing-only use cases, but it does not include cloud storage, data profiling, visualization, or saved views. The pricing page lists Pro at 19 EUR/month and Business at 39 EUR/month; however, the Terms of Service state Pro is 9 EUR/month and Business is 29 EUR/month. This is a clear inconsistency, so you should verify pricing before purchasing. Payments are handled via Stripe, and subscriptions can be canceled at any time. Note that the free viewers process files locally, while Workspace uploads files to Supabase-backed cloud storage for analysis and collaboration.
The advantages are that it requires no installation or registration, supports a wide range of formats, communicates its privacy model clearly, and explicitly states file size limits and modern browser support. The downsides are that the free version only solves viewing needs; large files are limited by browser performance; there is no visible information about open source availability, self-hosting, or public API/SDK support; and inconsistent pricing information weakens its commercial credibility.
It is suitable for developers, data analysts, GIS users, and people working with 3D or document files who need to quickly inspect file contents. It can also serve small teams using Workspace for lightweight data exploration and reporting. The collected text does not specify accessibility from mainland China, so this remains unknown. Since payments rely on Stripe, users in China may need to confirm whether their bank cards are supported. Alternatives can be chosen by use case, such as Excel/LibreOffice, DB Browser for SQLite, QGIS, geojson.io, various JSON/CSV viewers, or IDE plugins.
⚠ This review is compiled from public sources and does not constitute a purchase recommendation. Verify all facts on the vendor's official site. Verify on dataviewer.com official site.
dataviewer.com is an Unknown Dev Tools provider. TG4G tracks its product information, an overall rating of 8.0/10, and a China-accessibility score of China direct-connect friendly. Click "Visit Official Site" to reach dataviewer.com directly.