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Mozilla PDF.js

Free#5 of 23 in PDF ReadersFile Reader Software

Mozilla PDF.js: A developer-focused PDF viewer and rendering platform for web applications. Ranked #5 of 23 in PDF Readers by our editors (8.8/10); pricing: Free plan; best for web and application developers.

8.8/10Editor score

Visit Mozilla PDF.js

Mozilla PDF.js8.8 Visit Mozilla PDF.js

At a glance

Editor score
8.8 / 10
Pricing
Free plan
Best for
Web and application developers
Free plan
Yes
Paid from
Free
Facts checked
24 Sep 2026

Where it wins
- Open-source PDF parsing, rendering, search, and browser viewing
- Annotation editing includes highlights, free text, ink, stamps, and signatures
- Supports npm, CDNs, APIs, self-hosting, and Firefox and Chrome extensions
Where it doesn't
- Requires developer integration rather than serving as a conventional end-user app
- Its focus is PDF viewing, parsing, forms, and annotations
- Interactive scripting is centered on PDF form calculations and actions

Our verdict on Mozilla PDF.js

Mozilla PDF.js is an open-source JavaScript library and browser-based viewer for parsing and rendering Portable Document Format files. It is aimed at web and application developers who need to embed PDF capabilities in web applications or distribute a viewer through browser extensions. The platform includes text extraction, selection, search, page navigation, zoom, printing, downloading, annotation handling, interactive PDF scripting, and annotation-editing interfaces.

Its ecosystem fit is a major strength. Developers can work with prebuilt packages, source code, npm distribution, a CDN, a display API, and a core parsing layer. The published integrations include npm, jsDelivr, cdnjs, and unpkg, while the platform list covers web, Chrome extensions, APIs, and self-hosted deployments. Firefox and Chrome browser extensions extend its reach beyond an embedded application viewer. This combination suits teams that need control over how PDFs are delivered, rendered, or integrated into an existing application stack.

PDF.js also offers broader document interaction than a basic reader. Annotation editing supports highlights, free text, ink, stamps, and signatures, while interactive-PDF scripting handles form calculations, validations, and button actions. Its category capabilities include annotation tools, form filling, and cross-platform support. The trade-off is that PDF.js is a library and viewer rather than a conventional end-user subscription product, so teams seeking a packaged consumer reader should choose a product built around that use case. Developers who want an open-source foundation for browser PDF viewing, parsing, annotations, and forms should consider PDF.js.

Your product? Our editors can test Mozilla PDF.js in depth and publish a review, labelled as paid · from $149/mo →

Mozilla PDF.js pricing

Plans Free planFree Free to use — no paid tier required for the core job.

See plans on mozilla.github.io

Mozilla PDF.js fact sheet

Free plan	Yes
Paid from	Free
Annotation tools	Yes
OCR support	None
Form filling	Yes
Offline access	Not verified
Text-to-speech	Not verified
Platform support	Web
Deployment	Self-hosted
Platforms	Web
Support	Community, Docs
Built for	Solo, Small business, Mid-market, Enterprise (editorial estimate)
Pricing	Free plan
Website	mozilla.github.io
Facts checked	24 Sep 2026

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Mozilla PDF.js vs the competition

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Also Ranked In

Mozilla PDF.js is ranked in 2 of our directories.

#6File Reader Software24 tools ranked

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The editor score above is our own research. What this page doesn't have yet is a reader's view — what you used Mozilla PDF.js for, what worked and what didn't. No stars are seeded and no review is paid for; an editor reads every one before it appears.

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Featured on iTechGuides

Mozilla PDF.js is listed in our PDF Readers directory. Add the badge to your site — it links back to this page.

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Reviewed by iTechGuides Editors · Editorial team · Updated Oct 2026

Advertiser disclosure: iTechGuides is reader-supported. Vendors can pay for top positions in our rankings and for a place on other products' pages, and we may earn a commission when you click some links. Bought places stand at the number bought; this page and our disclosure say so. Paying vendors may get a fuller, more detailed review from our editors, and that review can change their score. How we rank.

Last updated 7 Oct 2026 · How we research and update