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Flyfish File Viewer
Browser-native previews for Office, PDF, CAD and more
Flyfish File Viewer is an Apache-2.0, browser-native, offline-first file preview toolkit for private and internal web apps. It maps 206 extensions across 24 pipelines—Office, PDF/OFD, CAD, archives, email, diagrams, 3D, media and data—without mandatory server-side conversion. Use modular components, presets or full packages across Vanilla JS/Web Components, React, Vue, Svelte and jQuery. Workers, WASM and assets can be self-hosted; read-only fidelity varies by format.
I started this in 2022 after a work request: preview documents entirely in the browser for a consumer app whose backend resources were limited. I expected it to be a narrow internal problem, but the first blog post brought many developers with the same need.
The hardest work has been format compatibility and large-file performance, especially reliable Worker/WASM loading under private and offline deployments. Today it maps 206 extensions across 24 preview pipelines, from Office and PDF/OFD to CAD, archives, email, diagrams, 3D and data.
I’d especially value feedback on engineering formats, everyday documents, large files and deployment friction. Please share sanitized samples or compatibility reports if something does not render as expected.
About Flyfish File Viewer on Product Hunt
“Browser-native previews for Office, PDF, CAD and more”
Flyfish File Viewer was submitted on Product Hunt and earned 11 upvotes and 9 comments, placing #105 on the daily leaderboard. Flyfish File Viewer is an Apache-2.0, browser-native, offline-first file preview toolkit for private and internal web apps. It maps 206 extensions across 24 pipelines—Office, PDF/OFD, CAD, archives, email, diagrams, 3D, media and data—without mandatory server-side conversion. Use modular components, presets or full packages across Vanilla JS/Web Components, React, Vue, Svelte and jQuery. Workers, WASM and assets can be self-hosted; read-only fidelity varies by format.
On the analytics side, Flyfish File Viewer competes within Open Source, Privacy, Developer Tools and GitHub — topics that collectively have 637k followers on Product Hunt. The dashboard above tracks how Flyfish File Viewer performed against the three products that launched closest to it on the same day.
Who hunted Flyfish File Viewer?
Flyfish File Viewer was hunted by Yu Wang. A “hunter” on Product Hunt is the community member who submits a product to the platform — uploading the images, the link, and tagging the makers behind it. Hunters typically write the first comment explaining why a product is worth attention, and their followers are notified the moment they post. Around 79% of featured launches on Product Hunt are self-hunted by their makers, but a well-known hunter still acts as a signal of quality to the rest of the community. See the full all-time top hunters leaderboard to discover who is shaping the Product Hunt ecosystem.
For a complete overview of Flyfish File Viewer including community comment highlights and product details, visit the product overview.
Yu Wang