Best Adobe PDF Embed API alternatives (2026)

The best Adobe PDF Embed API alternative for teams that need more than a free view-and-comment embed is Nutrient DWS Viewer API, when annotations, form data, and collaboration must persist without you running viewer servers. It pairs a hosted backend with the Nutrient Web SDK client, and your backend requests the session tokens. Nutrient Web SDK alone is the self-hosted, client-side WebAssembly option for apps that must keep documents in the browser or on their own servers. Apryse WebViewer fits teams that need broad format coverage and document editing. Foxit PDF SDK for Web fits teams that want feature modules licensed one by one. Syncfusion PDF Viewer fits teams already building on Syncfusion components. ComPDF for Web fits teams that want a client-only commercial viewer. PDF.js and EmbedPDF fit teams that want open source code and will own the rest.

What decides the choice is what happens after the PDF renders: where edits are stored, which file types users open, how far the UI must change, and where documents may travel.

What Adobe PDF Embed API does well

Adobe describes PDF Embed API as a way to embed a PDF viewer in your web applications with only a few lines of code(opens in a new tab). Its pricing page(opens in a new tab) lists “unlimited access at no charge,” and the product page(opens in a new tab) calls it a free JavaScript API that adds collaboration and analytics.

The documented setup is short, and it needs no backend of yours. You add Adobe’s viewer.js script, register for a client ID, and call the viewer from your page. Adobe’s getting started guide(opens in a new tab) notes that a client ID works only on the domain it was registered for.

Adobe documents four embed modes(opens in a new tab): full window, sized container, in-line, and lightbox. In full window mode, commenting tools such as sticky notes, highlights, drawing, strikethrough, and underline are on by default. Live form filling is also on by default, and it works only in full window mode.

Analytics are a genuine strength: the analytics guide(opens in a new tab) covers events through a registered callback, rich PDF analytics for Adobe Analytics subscribers, and Google Analytics 4 properties. Adobe also states that PDF Embed API “doesn’t store any user-generated content and never shares user-generated content with Adobe servers.”

Why teams look beyond Adobe PDF Embed API

• Annotation persistence and forms workflows — Adobe’s save callback(opens in a new tab) hands your code the updated PDF as an ArrayBuffer to store “in an external file storage system.” Without a callback, users download the file. Storage, versioning, and syncing comments between users are yours to build. XFA forms, digital signature fields, and calculated fields are listed as unsupported.
• Office formats — Adobe’s Embed API documentation describes rendering PDFs. Word, Excel, or PowerPoint files need a conversion step before they reach the viewer.
• Customization and headless use — UI options are mostly show* flags that hide controls such as thumbnails, download, print, and annotation tools. The UI customization guide doesn’t describe custom themes or toolbar buttons.
• Self-hosting and data boundary — The viewer script loads from Adobe’s domain, and the client ID is bound to a registered domain. Adobe’s Embed API documentation doesn’t describe a self-hosted package for on-premises deployments.
• Support — Adobe’s pricing page lists technical support on certain paid Acrobat Services plans and points other questions to the Adobe forum. It lists no paid tier for the Embed API itself.
• Limits — Adobe’s how-to guide(opens in a new tab) sets a five-minute file-rendering timeout, and linearized streaming works only in full window mode on Chromium-based desktop browsers.

None of this makes Embed API a poor choice. It’s a free viewer that leaves persistence, formats, and operations to you.

Criteria that matter in production

Use the same six questions for every candidate.

Integration path

Check whether production needs a backend to issue tokens or a client-side key suffices.

Annotations, forms, and signing

Check annotation types, form coverage (XFA, calculated fields), and whether you need electronic or certificate-based digital signatures.

Persistence and collaboration

Ask where an annotation goes after a user adds it: back to your code as a modified PDF, or to a server that persists and syncs it.

Supported formats

List the file types users actually open. PDF-only viewers need a separate conversion step for Office files.

Security, permissions, and data residency

Check where documents are stored and rendered, which regions are available, and how sessions are scoped to documents and permissions.

Pricing shape and support

Price free, per-session, per-domain, and per-developer licensing against real traffic, and check what support the plan includes.

Adobe PDF Embed API alternatives at a glance

The table summarizes each option from its own documentation. It isn’t a ranking.

1. Nutrient DWS Viewer API

Nutrient DWS Viewer API is a hosted service that authorizes Nutrient Web SDK viewer sessions, tracks usage, and optionally stores and renders your documents. It isn’t a drop-in script like Adobe’s. It’s a hosted backend paired with the Nutrient Web SDK client, so you get the workflow pieces Embed API leaves to you without running Document Engine or viewer servers.

The integration has two parts. In the browser, you add Nutrient Web SDK to your app (the getting started guide uses the CDN build) and call NutrientViewer.load() with a session token. On your backend, you create that session with POST /viewer/sessions and keep the DWS API key out of the browser. Adobe PDF Embed API needs no backend of yours, so this is extra work, and it’s the step that scopes each session to specific documents and permissions.

Persistence is the main difference. For DWS-managed documents, form fields, annotations, and comments are persisted by DWS Viewer API with its built-in syncing, and the collaboration guide describes managed real-time collaboration for Web SDK clients. For app-provided documents, your app passes the file to the viewer and stays responsible for persistence.

Format coverage goes beyond PDF. The supported file types guide lists PDF, Word (DOC, DOCX), Excel (XLS, XLSX), PowerPoint (PPT, PPTX), PNG, JPG, and TIFF for DWS-managed documents. The viewer includes annotations, form filling, electronic signatures (drawn, typed, or image), and toolbar and theme customization. The DWS Viewer API overview notes that measurement tools and document comparison are Web SDK features and aren’t available in DWS Viewer API yet.

On security, the security guide says DWS Viewer API runs on AWS in eu-central-1 (Frankfurt) or us-west-2 (Oregon), encrypts data in transit and at rest, and doesn’t upload app-provided documents. The Viewer API page states that Nutrient is SOC 2 Type 2 audited and GDPR-compliant.

Pricing is session-based. The pricing guide counts each document load as one viewer session. The free plan includes 250 viewer sessions per month, 100 stored documents, and 500 MiB of storage, with no payment information required. Commercial use on the free tier is restricted for enterprises with more than 20 employees or more than $1 million in annual revenue. See the Viewer API pricing page for paid plans.

Choose Nutrient DWS Viewer API when:

• Annotations, form data, and comments must persist and sync without you building storage.
• Users open Office files and images as well as PDFs.
• Your backend can request session tokens, and you don’t want to run Document Engine or viewer servers.
• Sessions must be scoped to specific documents and permissions.
• You want a free tier for evaluation and a hosted service for production.

The self-hosted sibling: Nutrient Web SDK

Nutrient Web SDK is the same viewer client with a license key instead of a DWS session, and no hosted backend. It processes documents client-side with WebAssembly, or server-side with Document Engine, which the deployment guide describes as offering the same functionality as DWS Viewer API on your own infrastructure.

Web SDK covers 17+ annotation types, form creation and filling, electronic and digital signatures, redaction, and Office files rendered in the browser. You can replace UI components through the slot system or run headless with preset: 'minimal'.

Choose Nutrient Web SDK when documents must never leave the browser or your own servers, or when the UI must be fully replaced.

2. Apryse WebViewer

Apryse WebViewer(opens in a new tab) is a JavaScript library for viewing, annotating, and editing PDFs, Office documents, images, and video. It renders client-side with WebAssembly and lists annotation, form building, digital signatures, redaction, and separate DOCX and spreadsheet editors.

WebViewer Server(opens in a new tab) is a self-hosted backend you run in Docker or on Windows, including in your own AWS or Azure accounts. It adds support for older browsers, lower-powered devices, and more formats, including CAD.

Choose Apryse WebViewer when broad format coverage and in-browser document editing lead the evaluation.

3. Foxit PDF SDK for Web

Foxit PDF SDK for Web(opens in a new tab) is a JavaScript library for PDF viewing and editing in web applications. It renders client-side in a Web Worker with WebAssembly modules and ships Node.js scripts for server-side features.

Advanced modules include document comparison, page editing, XFA forms, watermarks, and form recognition, and Foxit states that modules load according to your license.

Choose Foxit PDF SDK for Web when you want to license advanced PDF modules one at a time.

4. Syncfusion PDF Viewer

The Syncfusion JavaScript PDF Viewer(opens in a new tab) is part of a larger UI component suite. Its overview lists text markup, shape, and stamp annotations, comments, form filling, a form designer, handwritten signatures, and custom toolbars. It runs in standalone or server-backed mode(opens in a new tab).

Syncfusion’s community license(opens in a new tab) covers companies with less than $1 million USD in annual revenue, five or fewer developers, and 10 or fewer employees.

Choose Syncfusion PDF Viewer when your app already uses Syncfusion components.

5. ComPDF for Web

ComPDF for Web(opens in a new tab) (from ComPDFKit) describes itself as a JavaScript PDF library for viewing, annotating, editing, and signing PDFs in the browser. Its standalone mode runs entirely on the client with a PDFium-based rendering engine.

Choose ComPDF for Web when a client-only commercial PDF viewer with editing and signing covers the requirement.

6. PDF.js

PDF.js(opens in a new tab) is Mozilla’s “general-purpose, web standards-based platform for parsing and rendering PDFs,” licensed under Apache 2.0. You host it and control the code.

Annotation storage, collaboration, Office formats, and support are yours to build. The PDF.js vs. Nutrient comparison covers that trade-off in detail.

Choose PDF.js when an open source PDF renderer is enough and your team can own the UI, persistence, and maintenance.

7. EmbedPDF

EmbedPDF(opens in a new tab) is an open source viewer whose core is MIT licensed. Its documentation(opens in a new tab) describes a ready-made viewer with themes, headless components with React, Vue, and Svelte hooks, and an engine layer that wraps PDFium.

Choose EmbedPDF when you want an open source drop-in viewer with headless components.

Scenario-based recommendations

You need edits to persist without building storage

Choose Nutrient DWS Viewer API when annotations, form data, and comments must be saved and synced by a hosted backend while your app runs the Nutrient Web SDK client. Adobe PDF Embed API returns an updated PDF buffer to your code, and the storage is yours.

Users open Office files, not only PDFs

Choose Nutrient DWS Viewer API when users open Word, Excel, PowerPoint, and image files in the same viewer as PDFs. Choose Apryse WebViewer when users also need to edit DOCX or spreadsheet files in the browser.

Documents must stay inside your boundary

Choose Nutrient Web SDK when documents must stay in the browser or on servers you control. Choose PDF.js when an open source renderer is enough.

You only need a free read-and-comment embed

Choose Adobe PDF Embed API when a free PDF viewer with commenting and Adobe Analytics or Google Analytics 4 reporting covers the full requirement.

Run a fair proof of concept

1. Collect 20–30 representative files, including large PDFs, scanned pages, complex forms, and the Office files users actually open.
2. Rebuild the current Adobe integration in each candidate, including your save path.
3. Edit annotations in two browsers at once, fill your hardest forms, and check where each change lands.
4. Open PDFs that Adobe’s save callback wrote annotations into, and confirm those annotations still display and stay editable.
5. Confirm the hosting region, session or license scoping, data-retention terms, and support channel in writing.
6. Price a month of real usage under each pricing shape: sessions, domains, developers, or free.

FAQ

Related reading

• PDF.js vs. Nutrient
• Nutrient vs. Apryse
• Nutrient DWS Viewer API
• How to embed a PDF viewer in your website
• Best PDF viewer APIs