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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.
Handy for our internal dashboard where we deal with weird legacy file types daily. The self-hosted WASM setup was straightforward, and previewing .ofd and .dwg directly in the browser without round-tripping through a server just works.
offline-first is huge for our internal tools, and the fact it just works in the browser without uploading to a server is exactly what we needed. tossed a random ofd file at it and it handled the format i half expected to fail.
Would love to see a side-by-side diff view for revisions of Office and PDF docs, since read-only previews are great but comparing two versions without exporting would make internal review workflows way smoother.
as someone who self-hosts a lot of internal tools, the offline-first approach is genuinely useful. one thing that would push this further for me is a built-in thumbnail caching layer so preview grids in file browsers stay snappy after the first load. the rest looks solid, nice work
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.
Flyfish File Viewer was featured in Open Source (68.6k followers), Privacy (11.2k followers), Developer Tools (515.9k followers) and GitHub (41.3k followers) on Product Hunt. Together, these topics include over 122.7k products, making this a competitive space to launch in.
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.
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Yu Wang