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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

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 PDF library for .NET and Java from E-iceblue: it creates and edits PDFs, converts to and from a long list of formats, signs and encrypts them, fills and exports forms, and extracts text, images, tables and attachments. It needs no Adobe installation and no native dependency. The vendor sells it both standalone and as part of Spire.Office, alongside libraries for Word, Excel and PowerPoint, and its customers named on the site include Intel, Samsung, Deloitte and the United Nations.

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 free edition has hard limits that the vendor documents: ten pages for loading and creating, and three pages for PDF-to-image conversion. A pipeline tested on a short sample can therefore appear to work while a real document behaves differently, which is why the full-document test is the requirement rather than a sample one. What the library does past those limits is not established here, and a page limit is not the same finding as a silent truncation or an error. The library is commercial, with per-developer licensing and temporary licences available for evaluation.

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
Commercial, per-developer licensing with a limited free edition; temporary licences available for evaluation
Redaction
No redaction feature
Programmatic access
Embeddable library
Last availability check
We could not check 16 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 16 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.