--- title: "1.6 release notes" canonical_url: "https://www.nutrient.io/guides/document-engine/release-notes/1-6/" md_url: "https://www.nutrient.io/guides/document-engine/release-notes/1-6.md" last_updated: "2026-05-14T21:57:26.844Z" description: "Latest updates and release notes for Nutrient Document Engine SDK, including new features, improvements, and bug fixes." --- > **We usually recommend upgrading one version at a time. However, version 1.5.x takes significantly longer to migrate databases with a large number of documents — if this applies to you, skip directly to 1.6.0.** ## Highlights This release introduces compatibility with the new versioning of [Nutrient Web SDK](https://www.nutrient.io/guides/web.md) (`1.0.0` follows `2024.8.x`). Make sure to reread the [client integration](https://www.nutrient.io/guides/document-engine/viewer/client-integration/web.md) documentation, because Nutrient Web SDK renamed `pspdfkit.js` to `nutrient-viewer.js` and introduced `NutrientViewer` instead of `PSPDFKit` (the latter of which is still kept as an alias). Additionally, Document Engine responds with the `Server` header set to `Document Engine/x.y.z`, where `x.y.z` is the version of Document Engine. This change is subtle, but it enables you to identify problems more quickly (e.g. determining if a response is coming from Document Engine or a proxy like NGINX). The HTML conversion engine no longer triggers unwanted outgoing network activity. There should be no traffic to `optimizationguide-pa.googleapis.com` (port 443, UDP) and `239.255.255.250` (port 1900, UDP). We fixed the conversion engine configuration to make sure this doesn’t happen again. TIFF conversion now supports 1-bit TIFF files with `min-is-white` photometric interpretation and 0 DPI (e.g. barcodes). Version 1.6 also improves the handling of large TIFF files concerning memory allocations and CPU load. Version 1.6 adds two new upstream API endpoints, allowing you to fetch the text of all pages in a document: - `/api/documents/:document_id/pages/text` - `/api/documents/:document_id/layers/:layer_name/pages/text` ## Breaking changes JSON Web Token (JWT) authorization requires you to provide a list of document identifiers the user is allowed to access in the JWT claims. If not specified, the user isn’t allowed to access any documents. Examples: - If not set, set to `null`, or an empty array is provided (`{ "allowed_document_ids": [] }`) — No access allowed - `{ "allowed_document_ids": "any" }` — Access to any document is allowed - `{ "allowed_document_ids": ["foo", "bar"] }` — Access to documents with `foo` or `bar` identifiers is allowed ## Database migrations Document Engine creates two sets of assets whenever it has to convert a document from a different format into a PDF on upload. These assets are: - The PDF result of the conversion, referred to as `source_pdf` in the `documents` table. - The original file of the conversion, referred to as `original_file` in the `documents` table. Historically, both `source_pdf` and `original_file` refer to assets in the `pdfs` table using an encoded form of the assets’ `sha256` hash. This release ships a change that lazily starts using `uuid` to refer to `original_file` assets in the `documents` table instead of `sha256`. ## Changelog A full list of changes, along with the issue numbers, is available [here](https://www.nutrient.io/guides/document-engine/changelog.md#1.6.0). --- ## Related pages - [1 1](/guides/document-engine/release-notes/1-1.md) - [1 10](/guides/document-engine/release-notes/1-10.md) - [1 11](/guides/document-engine/release-notes/1-11.md) - [1 12](/guides/document-engine/release-notes/1-12.md) - [1 13](/guides/document-engine/release-notes/1-13.md) - [1 2](/guides/document-engine/release-notes/1-2.md) - [1 14](/guides/document-engine/release-notes/1-14.md) - [1 5](/guides/document-engine/release-notes/1-5.md) - [1 15](/guides/document-engine/release-notes/1-15.md) - [1 3](/guides/document-engine/release-notes/1-3.md) - [1 4](/guides/document-engine/release-notes/1-4.md) - [1 9](/guides/document-engine/release-notes/1-9.md) - [1 7](/guides/document-engine/release-notes/1-7.md) - [Upgrading from PSPDFKit Server](/guides/document-engine/release-notes/upgrading-from-server.md) - [Upgrading from PSPDFKit Processor](/guides/document-engine/release-notes/upgrading-from-processor.md) - [1 8](/guides/document-engine/release-notes/1-8.md) - [Upgrading Document Engine](/guides/document-engine/release-notes/upgrading.md)