--- title: "2019.4 release notes" canonical_url: "https://www.nutrient.io/guides/web/release-notes/2019-4/" md_url: "https://www.nutrient.io/guides/web/release-notes/2019-4.md" last_updated: "2026-06-09T10:19:57.981Z" description: "Explore key enhancements in PSPDFKit for Web 2019.4, including UI changes, a new Document Editor, and migration tips for seamless adaptation." --- # Essential updates in PSPDFKit for Web 2019.4 [PSPDFKit for Web 2019.4](https://www.nutrient.io/blog/pspdfkit-web-2019-4/) comes with a few improvements that might require an ad hoc migration. ### Notable changes - We have changed our default UI to use a bright toolbar by default. Some changes might be necessary if you have used custom CSS that depended upon the dark toolbar, which is available by selecting `NutrientViewer.Theme.DARK` in [`NutrientViewer.Configuration#theme`](https://www.nutrient.io/api/web/interfaces/Configuration.html#theme). - A new Document Editor component has been implemented. If your license includes the document editing component, a new toolbar button that gives you access to this UI feature will be available in the main toolbar. You may need to update your toolbar items handling if your implementation depends on the toolbar items’ default configuration (see [`NutrientViewer.defaultToolbarItems`](https://www.nutrient.io/api/web/variables/NutrientViewer.defaultToolbarItems.html)). - We updated the naming schema of our additional chunks delivered via the `pspdfkit-lib/` folder. The new names will now have prefixes you can use to preload specific parts of the app if necessary. Some examples include: - `pspdfkit-lib/chunk-locale--*.js` files are used for internationalization files, e.g. `pspdfkit-lib/chunk-locale-de-*.js` for the German localization. - `chunk-standalone-*.js` is for all Standalone-specific artifacts. - `chunk-server-*.js` is for all Server-specific artifacts. Note that the last part of the file name is still a hash of its content. This ensures we don’t run into caching issues when artifacts are updated. - The icons in the toolbar were changed in order to shrink the toolbar height. Additionally, the icon size changed from 18x18 px to 24x24 px. - The WebAssembly and asm.js artifacts now have a content hash as part of the file name. This allows you to configure a long-term caching strategy and make use of advanced features like [WASM code caching](https://v8.dev/blog/wasm-code-caching). The affected files are: - `pspdfkit-lib/pspdfkit.wasm` ➡️ `pspdfkit-lib/pspdfkit-.wasm` - `pspdfkit-lib/pspdfkit.wasm.js` ➡️ `pspdfkit-lib/pspdfkit-.wasm.js` - `pspdfkit-lib/pspdfkit.asm.js` ➡️ `pspdfkit-lib/pspdfkit-.asm.js` - `pspdfkit-lib/pspdfkit.asm.js.mem` ➡️ `pspdfkit-lib/pspdfkit-.asm.js.mem` - The thumbnail sidebar now comes with a changed layout. All public CSS classes can still be used to customize the styling: - `.PSPDFKit-Sidebar-Thumbnails-Page` - `.PSPDFKit-Sidebar-Thumbnails-Page-Image` - `.PSPDFKit-Sidebar-Thumbnails-Page-Label` - `.PSPDFKit-Sidebar-Thumbnails-Page-Selected` If you use PSPDFKit Server, make sure you read the [2019.4 server migration guide](https://www.nutrient.io/guides/product-archives-and-deprecated-solutions.md). For a full list of changes, check out the [changelog](https://www.nutrient.io/guides/web/changelog.md#2019.4). --- ## Related pages - [1 0](/guides/web/release-notes/1-0.md) - [1 1](/guides/web/release-notes/1-1.md) - [1 10](/guides/web/release-notes/1-10.md) - [1 11](/guides/web/release-notes/1-11.md) - [1 12](/guides/web/release-notes/1-12.md) - [1 13 1](/guides/web/release-notes/1-13-1.md) - [1 13](/guides/web/release-notes/1-13.md) - [1 14](/guides/web/release-notes/1-14.md) - [1 15](/guides/web/release-notes/1-15.md) - [1 16](/guides/web/release-notes/1-16.md) - [1 17](/guides/web/release-notes/1-17.md) - [1 18](/guides/web/release-notes/1-18.md) - [1 2](/guides/web/release-notes/1-2.md) - [1 3](/guides/web/release-notes/1-3.md) - [1 4](/guides/web/release-notes/1-4.md) - [1 5](/guides/web/release-notes/1-5.md) - [1 6](/guides/web/release-notes/1-6.md) - [1 7](/guides/web/release-notes/1-7.md) - [1 8](/guides/web/release-notes/1-8.md) - [1 9](/guides/web/release-notes/1-9.md) - [2017 3](/guides/web/release-notes/2017-3.md) - [2017 6](/guides/web/release-notes/2017-6.md) - [Update your PSPDFKit for Web to version 2017.7](/guides/web/release-notes/2017-7.md) - [Upgrade annotations in PSPDFKit Web 2017.8](/guides/web/release-notes/2017-8.md) - [Explore new features in PSPDFKit for Web 2017.9](/guides/web/release-notes/2017-9.md) - [New features in the 2018.1 migration guide](/guides/web/release-notes/2018-1.md) - [PSPDFKit for Web 2018.2 migration insights](/guides/web/release-notes/2018-2.md) - [Discover the new features in PSPDFKit for Web 2018.3](/guides/web/release-notes/2018-3.md) - [Explore PSPDFKit for Web 2018.4 features](/guides/web/release-notes/2018-4.md) - [Explore new features in PSPDFKit 2018.5](/guides/web/release-notes/2018-5.md) - [Explore PSPDFKit for Web 2018.6 enhancements](/guides/web/release-notes/2018-6.md) - [Explore the new features in PSPDFKit 2018.7](/guides/web/release-notes/2018-7.md) - [Key updates in PSPDFKit for Web 2019.1](/guides/web/release-notes/2019-1.md) - [2019 2](/guides/web/release-notes/2019-2.md) - [PSPDFKit for Web 2019.3 migration highlights](/guides/web/release-notes/2019-3.md) - [PSPDFKit for Web 2019.5 migration insights](/guides/web/release-notes/2019-5.md) - [Key changes in PSPDFKit for Web 2020.1](/guides/web/release-notes/2020-1.md) - [Seamless migration to PSPDFKit for Web 2020.2](/guides/web/release-notes/2020-2.md) - [Upgrade to PSPDFKit Web 2020.3 seamlessly](/guides/web/release-notes/2020-3.md) - [PSPDFKit Web and Server 2020.4 migration update](/guides/web/release-notes/2020-4.md) - [Unified CRUD API enhancements for easy migration](/guides/web/release-notes/2020-5.md) - [PSPDFKit Web 2020.6 migration insights](/guides/web/release-notes/2020-6.md) - [Upgrade to PSPDFKit for Web 2021.1 with ease](/guides/web/release-notes/2021-1.md) - [Seamlessly migrate to PSPDFKit for Web 2021.2](/guides/web/release-notes/2021-2.md) - [2021 3](/guides/web/release-notes/2021-3.md) - [PSPDFKit 2021.4 migration guide for seamless updates](/guides/web/release-notes/2021-4.md) - [Migration guide for PSPDFKit 2021.5](/guides/web/release-notes/2021-5.md) - [2021 6](/guides/web/release-notes/2021-6.md) - [PSPDFKit 2022.1.1 migration changes](/guides/web/release-notes/2022-1.md) - [Enhancements in PSPDFKit for Web 2022.2](/guides/web/release-notes/2022-2.md) - [Explore the new features of PSPDFKit for Web 2022.3](/guides/web/release-notes/2022-3.md) - [PSPDFKit for Web 2022.4 migration overview](/guides/web/release-notes/2022-4.md) - [Key improvements in PSPDFKit for Web 2022.5](/guides/web/release-notes/2022-5.md) - [Discover the key updates in PSPDFKit for Web 2023.1](/guides/web/release-notes/2023-1.md) - [PSPDFKit 2023.2 migration and updates](/guides/web/release-notes/2023-2.md) - [Key updates in PSPDFKit for Web 2023.3](/guides/web/release-notes/2023-3.md) - [Explore key updates in PSPDFKit for Web 2023.4](/guides/web/release-notes/2023-4.md) - [Key updates in PSPDFKit for Web 2023.5](/guides/web/release-notes/2023-5.md) - [Essential Nutrient Web SDK 2024.1 migration tips](/guides/web/release-notes/2024-1.md) - [2024 2](/guides/web/release-notes/2024-2.md) - [2024 3](/guides/web/release-notes/2024-3.md) - [2024 4](/guides/web/release-notes/2024-4.md) - [2024 5](/guides/web/release-notes/2024-5.md) - [2024 7](/guides/web/release-notes/2024-7.md) - [2024 8](/guides/web/release-notes/2024-8.md) - [Upgrading Nutrient Web SDK](/guides/web/release-notes/upgrading.md)