# Stirling PDF review

An open-core, self-hostable PDF editor with 60+ tools for merging, converting, OCR, and redacting documents without sending files to a third-party cloud.

By Noah — last updated & pricing verified September 15, 2026.

> **Stirling PDF** is an open-core PDF toolkit that bundles more than 60 individual operations — merge, split, compress, convert to/from Word or images, OCR scanned pages, add watermarks, redact text, and apply digital signatures — into one self-hosted application.

Unlike Adobe Acrobat or Smallpdf, which process files on the vendor's servers, Stirling PDF's Editor runs entirely on infrastructure the user controls: a Docker container, a downloaded desktop build, or an air-gapped server with no outbound network access. The core Editor is free and its source is public on GitHub, where the project has passed 90,000 stars. Paid tiers layer on top of the same open-source core: Server adds single sign-on and team workspaces for $99/month in blocks of 100 users, and Processor adds API access, webhooks, and automation pipelines billed at a penny per credit after the first 500 are used free. Stirling Tools positions the paid tiers at organizations that need centralized deployment or programmatic document processing rather than a single desktop install.

## Facts

- Website: https://stirling.com
- Pricing: Free tier · paid from $99/mo (verified undefined NaN, NaN)
- License: Open core
- Platforms: web, windows, macos, linux
- Best for: teams and regulated organizations that need to edit, OCR, or redact PDFs without sending files to a third-party cloud service
- Standout feature: Self-hosted deployment (Docker, desktop, or air-gapped server) that keeps every PDF operation off vendor infrastructure, backed by a fully open-source core with 90,000+ GitHub stars.
- Biggest weakness: The Server tier's $99/month starting price is billed as a flat block for up to 100 users rather than a low per-seat rate, so a small team pays the same as a 100-person deployment; the Processor tier's per-credit billing also makes automation costs hard to predict without checking usage first.
- Third-party ratings: Product Hunt 5/5 (4 reviews)
- Categories: [PDF Tools](https://findalternative.to/categories/pdf-tools)

## Pricing snapshot

| Plan | Price | Notes |
| --- | --- | --- |
| Editor | $0/mo | Free forever; 60+ PDF tools via web, desktop, or self-hosted Docker deployment; source available on GitHub. |
| Server | $99/mo | Adds single sign-on, team workspaces, and invites; scales in 100-user blocks with centralized billing and tool management. |
| Processor | Custom | Usage-based at $0.01 per credit after the first 500 credits free; adds full API/webhook access, deployable pipelines, and file governance policies. |
| Enterprise | Custom | Custom pricing for regulated environments; air-gapped deployment, SCIM, data residency, and uptime SLAs. |

## Pros and cons

- Pro: Self-hosted deployment options (Docker, desktop, air-gapped) keep sensitive documents off third-party servers.
- Pro: Open-source core with 90,000+ GitHub stars and a publicly auditable codebase.
- Pro: 60+ tools cover merging, OCR, redaction, and e-signing in one application instead of several point tools.
- Pro: Free Editor tier has no user limit or feature paywall for individual use.
- Con: Server tier pricing is a $99/month block for up to 100 users, not a low-cost single-seat option for small teams.
- Con: Processor's per-credit billing requires monitoring usage to avoid unpredictable automation costs.
- Con: Self-hosting requires comfort with Docker or server administration; there's no fully managed cloud-only free plan.

## AI summary

- Stirling PDF is an open-core PDF toolkit with 60+ tools, self-hostable via Docker, desktop app, or air-gapped server.
- The core Editor tier is free with no user limit; source is public on GitHub with 90,000+ stars.
- The Server tier costs $99/month for up to 100 users and adds SSO and team workspaces.
- The Processor tier bills $0.01 per credit after the first 500 credits are free, adding API and webhook automation.
- Best for: teams and regulated organizations that need to edit, OCR, or redact PDFs without sending files to a third-party cloud service
- Pricing: Free for individuals; Server tier starts at $99/month for up to 100 users, Processor runs $0.01/credit after 500 free.
- Top alternatives: Adobe Acrobat, Smallpdf, PDFsam
- Limitation: Server tier is priced as a 100-user block rather than a low per-seat rate for small teams.
- Limitation: Processor's per-credit billing can produce unpredictable costs for heavy automation.

## Alternatives

4 vetted alternatives to Stirling PDF: https://findalternative.to/stirling-pdf — top picks: Adobe Acrobat, Smallpdf, iLovePDF

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