OnePreview
Markdown & file preview
About
This app allows you to preview and interact with various developer file formats, including Markdown, code, databases, and archives, directly on your iPhone and iPad. It offers local processing for speed and privacy, with features like PDF export and structured data inspection.
What's New in OnePreview
1.4.4
October 10, 2026
1. Added Spanish (Mexico) localization. 2. Improved preview performance and compatibility for Markdown and other text files.
Developer apps
FAQ
What file types can OnePreview preview?
OnePreview supports a wide range of file types including GitHub-style Markdown, MDX, TextBundle, TextPack, JSON, JSONL, YAML, XML, CSV, TSV, TOML, ENV, SQLite databases, source code, plain text, logs, and ZIP/TAR.GZ archives.
Does OnePreview require an account?
No, OnePreview is designed for local-first processing and does not require an account to use its features. This ensures your data remains private and processing is fast.
Can I export my Markdown files from OnePreview?
Yes, you can export standard Markdown files as A4 PDF reports. This feature allows you to preview rendered content, including table headers, wrapped code, Mermaid diagrams, and KaTeX formulas, before saving the PDF.
How does OnePreview handle structured data?
OnePreview allows you to inspect structured data formats like JSON, YAML, and XML, as well as view SQLite database schemas. This makes it easier to understand and work with complex data directly on your device.
Is OnePreview available on Mac?
Yes, OnePreview is supported on Mac, iPhone, and iPad, allowing for a consistent file previewing experience across Apple devices.
How often is OnePreview updated?
The latest version of OnePreview, 1.4.4, was released on October 10, 2026. Updates are provided to ensure compatibility and introduce new features or improvements.
What is the age rating for OnePreview?
OnePreview has an age rating of 4+, making it suitable for a wide range of users, including younger individuals who may be exploring developer-related content.
Does OnePreview have ads?
No, OnePreview is ad-free. As a free application, it does not contain advertisements, providing an uninterrupted user experience.
