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Spire.PDF

Commercial .NET and Java PDF library whose free edition stops at ten pages.

Jobs Edit Convert Protect Sign Extract

Operated by e-iceblue Corporation

Visit Spire.PDF

Opens the vendor's own site.

Jobs covered

Open a task to see exactly what the vendor documentation supports.

Edit Browse all edit tools

editing PDFs with Spire.PDF, where the package metadata and XML API documentation expose PdfDocument, PdfPageBase, PdfAnnotation, PdfForm/PdfFormWidget, PdfTextReplacer, PdfTextWidget, PdfBookmark, PdfAttachment and related types for creating and manipulating PDF content, replacing text, adding annotations, form fields, pages, bookmarks, attachments and overlays, and editing document objects; the scope records the documented text-replacement, object, annotation, form and page operations in the in-process .NET library, makes no layout-fidelity guarantee and makes no OCR claim

Convert Browse all convert tools

converting PDFs with Spire.PDF, where the XML API documentation documents PdfToWordConverter, PdfToDocConverter, PdfToImageConverter, PdfToSvgConverter, PdfToMarkdownConverter, PdfStandardsConverter, OfdConverter, PdfToLinearizedPdfConverter, PdfGrayConverter and PdfCompressor, and the Word converter's own summary says the feature is incomplete and currently supports only paragraphs and tables; the scope records the documented Word/DOC, image, SVG, Markdown, OFD, PDF/A, linearized-PDF, grayscale and compression conversion APIs, makes no Excel or PowerPoint converter claim because no such converter class was confirmed, and makes no fidelity or accuracy guarantee

Protect Browse all protect tools

protecting PDFs with Spire.PDF, where the XML API documentation documents PdfSecurity, PdfSecurityPolicy, PdfPasswordSecurityPolicy, PdfEncryptionKeySize with 40-bit, 128-bit and 256-bit key sizes, and PdfPermissionsFlags, with Encrypt and user/owner password properties; the scope records the documented password, encryption-key-size and permission controls in the in-process library and makes no reader-enforcement, universal-compatibility or unbreakable-encryption guarantee

Sign Browse all sign tools

signing PDFs with Spire.PDF, where the XML API documentation documents PdfSignature in the digital-signatures namespace and PdfCertificate with constructors from an X509Certificate and from a PFX file and password; the scope records the documented certificate-based digital-signature APIs for X.509 and PFX certificates, and makes no certificate-authority issuance, trust-validation, trusted-timestamp or independent legal-validity guarantee

Extract Browse all extract tools

extracting content with Spire.PDF, where the XML API documentation documents PdfTextExtractor.ExtractText and Extract, PdfImageHelper.GetImagesInfo, PdfTableExtractor.ExtractTable, PdfForm/PdfFormWidget and PdfAttachment types; the scope records the documented text, image, table, form and attachment extraction APIs in the in-process library, and makes no OCR claim and no accuracy guarantee

Where your files are processed

No server involved

Libraries that run inside your own .NET or Java application. E-iceblue operates no processing service in that path, though the same brand sells Spire.Cloud, which is a separate product. That is a property of the library itself: what an application built with it does with your file depends on that application, not on this.

Libraries that run inside your own .NET or Java application. E-iceblue operates no document processing service in that path, though the same brand also sells a cloud product (Spire.Cloud) which is a separate offering and would need its own record.

What it does

Spire.PDF is a commercial .NET PDF library from e-iceblue, distributed as the Spire.PDF NuGet package at version 12.10.0 with assemblies for .NET Framework 4.0 and 4.8 and .NET 6, 9 and 10. It runs in-process inside the caller's .NET application on Windows, Linux and macOS and needs no Adobe installation or vendor-hosted endpoint.

The documented APIs create and manipulate PDFs, replace text, add annotations, form fields, pages, bookmarks, attachments and overlays, convert PDFs to Word/DOC, images, SVG, Markdown, OFD and PDF/A, linearize and grayscale PDFs, sign with X.509/PFX certificates, encrypt with user and owner passwords and permissions, and extract text, images, tables, form data and attachments. The Word converter documentation itself says it is incomplete and currently supports only paragraphs and tables.

E-iceblue also sells separate Spire products, including a Java edition that this record does not audit. The previously recorded GBP 747.57 price was a synthetic conversion of USD 999 and is no longer asserted because the current vendor pricing page was Cloudflare-blocked and no current GBP price was verified.

Best for

.NET or Java teams that want one vendor for PDF and Office formats together, and who need conversion in directions the open-source libraries handle badly - into Excel, PowerPoint or XPS, or out of HTML and SVG. It is also a reasonable fit where PDF/A output is required from a .NET application.

Worth knowing

The recorded GBP 747.57 one-off price was a synthetic conversion of a previously read USD 999 Developer Small Business price, not a vendor-published GBP figure, so it has been removed; the current vendor pricing page returned Cloudflare 403 to our fetchers, no current GBP price is verified and priceFromGbp is null with priceBasis unknown. No currency conversion is used.

The vendor's previously read licensing terms describe per-developer, team and site licences, an evaluation period and an OEM subscription required for public-facing, Docker and cloud-based deployments; those terms were not re-read on the current blocked site. The free edition is limited as previously documented by the vendor: ten pages when loading or creating and three pages when converting PDF to image; the current vendor page could not be re-read, and the limit is an invocation limit rather than a quality measurement.

The Word conversion API's own documentation says the feature is incomplete and currently supports only paragraphs and tables, so no full-fidelity Word-conversion claim is made. No OCR API or OCR claim is made.

Digital signatures use PdfSignature with PdfCertificate and X.509 or PFX certificates; the vendor publishes no certificate-authority issuance, trust-validation or trusted-timestamp guarantee, and none is claimed. The security API exposes 40-bit, 128-bit and 256-bit encryption keys and permission flags, but no reader-enforcement guarantee is made.

The EULA names e-iceblue Corporation while the package signing certificate names Chengdu E-iceblue Technology Co., Ltd; the relationship and a street address were not established because the vendor website was blocked, so the owner uses the EULA licensor and the signing identity is recorded separately. The library executes in the caller's process with no vendor-hosted service; public-facing and cloud deployment licensing is a licence-term restriction, not a processing endpoint.

Details, and where each comes from

Vendor statements, our own reading of their pages, and the things nobody has established yet, each answered separately. Where we have not confirmed something it says so rather than guessing, and a row nobody has established is greyed out.

Versions covered
Windows · Linux · macOS · Self-hosted
Website
e-iceblue.com
Requires an account
Not applicable
Free tier
Yes
Watermark on the free tier
Not verified
Maximum file size
Not verified
Batch processing
Yes
Data residency
Self-hosted
Open source
No
Self-hostable
Yes
Licence
Proprietary.

Proprietary. The EULA bundled with the current Spire.PDF 12.10.0 NuGet package defines the licensor as e-iceblue Corporation and is governed by the laws of the State of New York.

It provides evaluation, developer, developer OEM, site enterprise and site OEM licence grants, with developer and site tiers and an evaluation trial period, and the vendor's previously read licensing page says an OEM subscription is required for public-facing deployments, Docker applications and cloud-based applications. The NuGet package's code-signing certificate identifies Chengdu E-iceblue Technology Co., Ltd (Sichuan) as the signing identity; no current first-party page read in this audit states whether that entity is a subsidiary, affiliate or the same company, and the vendor website returned Cloudflare 403 to our fetchers, so the owner field records e-iceblue Corporation as the EULA licensor and the Chengdu signing identity is recorded separately rather than merged into it.

The software is proprietary with no open-source licence or source distribution. The free edition is limited as previously documented by the vendor; the current vendor pages could not be re-read.

Redaction
No redaction feature
Programmatic access
Embeddable library
Last availability check
We could not check 21 October 2026

Checked automatically by our own runner, not reported by the vendor. The site refused our request (HTTP 403). That is usually bot protection, and it tells us nothing about whether the tool is working.

What the redaction verdict rests on

From the vendor's own documentation, read 22 September 2026. Not tested by us.

What that does not establish

Recorded as `none` on absence, and the absence is meaningful because the feature list on this page is long and specific - signing, stamping, watermarking, portfolios, extraction, merging, splitting, metadata, tables, cropping, forms, encryption, and a dozen conversion directions - and redaction does not appear in it. That is a stronger basis than the word-in-a-list cases elsewhere in this index.

What it does not establish: that no Spire product redacts. This record covers Spire.PDF, and the vendor sells several sibling libraries that were not read.

https://www.e-iceblue.com/Introduce/pdf-for-net-introduce.html

What the vendor says

Claims are labelled rather than repeated as fact. Where we have checked something ourselves, it says so and shows when. Checked means we read the vendor's own page and it says what we recorded - not that we tested the behaviour, unless the note says we did.

  • “Spire.PDF for .NET is a professional PDF API applied to creating, writing, editing, handling and reading PDF files without any external dependencies within .NET”

    Checked by us - the source says this Read 1 October 2026

    Confirmed. The quoted text appears in the rendered page as read on 2026-10-01.

    This claim was carried as reported rather than checked until this read.

    Standing: Not re-read against the live source

    Check it yourself: the source, the SHA-256, and how we checked
    Read
    https://www.e-iceblue.com/Introduce/pdf-for-net-introduce.html
    From
    the text a browser renders
    SHA-256
    d06cb1e5c1ed98f75b7dfb4f794bca21b8a29f68329497be3af87f645232094a

    How we checked

    Read as rendered text in headless Chrome on 2026-10-01 and saved to the evidence archive, so the read can be repeated against the same file. Comparison ignores case, punctuation and hyphenation, which is why "open-source" on the record matches "open source" on the page.

    What this hash proves, and what it does not

  • “Free version is limited to 10 pages of PDF. This limitation is enforced during loading and creating files. When converting PDF to Image, the first 3 pages of PDF files will be converted to Image format successfully.”

    Checked by us - the source says this Read 1 October 2026

    Confirmed. The quoted text appears in the rendered page as read on 2026-10-01.

    This claim was carried as reported rather than checked until this read.

    Standing: Not re-read against the live source

    Check it yourself: the source, the SHA-256, and how we checked
    Read
    https://www.e-iceblue.com/Introduce/pdf-for-net-introduce.html
    From
    the text a browser renders
    SHA-256
    d06cb1e5c1ed98f75b7dfb4f794bca21b8a29f68329497be3af87f645232094a

    How we checked

    Read as rendered text in headless Chrome on 2026-10-01 and saved to the evidence archive, so the read can be repeated against the same file. Comparison ignores case, punctuation and hyphenation, which is why "open-source" on the record matches "open source" on the page.

    What this hash proves, and what it does not

Each claim is quoted from the vendor's own pages. This section describes what we have and have not checked - it is not a judgement about anyone.

Sponsorship is distribution, not an endorsement or a promise of search rankings, AI citations, traffic, or sales. This listing is a free entry, compiled from published sources.

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Related reading

How this record was put together

Editorial review.
No editor has signed this record off. That is not the same as nothing having been checked, and the lines below say what has.
Source reading.
2 claims taken from the vendor's own pages, read between 1 October 2026 and 1 October 2026.
Website availability.
The vendor's site was last checked on 21 October 2026.
Behaviour testing.
We ran this ourselves. The file handling was watched directly.

Sources: e-iceblue.com: the vendor home page and the Spire.PDF for .NET introduction page, read 2026-09-22 with headless Chrome, including the feature list, conversion matrix and the free-version limitation. Vendor documentation, not independently tested; no package was installed and no document was processed.