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You needed to merge two PDFs last week.
You Googled "merge PDF free." You clicked the first result. You uploaded your tax return and your pay stub to a website you had never heard of. It merged them in 3 seconds. You downloaded the file and moved on.
You never thought about what happened to your documents.
They were uploaded to a server in a country you cannot name. Processed by software you cannot audit. Stored for a duration nobody disclosed. Your tax return. Your pay stub. Your salary. Your signature. On a stranger's disk. Forever.
You did this voluntarily. In under 10 seconds. Without reading a single word of fine print.
There is a tool that does everything those websites do. On YOUR computer. Your files never leave your machine.
It is called Stirling-PDF. 77,100+ stars on GitHub. 25 million+ downloads. The #1 PDF application on all of GitHub.
Here is what it does:
→ Merge PDFs. Split PDFs. Compress PDFs. Rotate and reorder pages.
→ Convert PDFs to Word, Excel, PowerPoint, and images. And back again.
→ Add passwords. Remove passwords. Flatten forms. Sanitize metadata.
→ Sign PDFs with a drawn signature, typed name, or digital certificate.
→ OCR scanned documents with Tesseract to make them searchable.
→ Add watermarks, page numbers, headers, footers, and stamps.
→ Redact text and images permanently. Crop, deskew, and repair.
→ View and annotate PDFs directly in your browser.
→ No-code automation pipelines to batch-process thousands of files.
→ REST API for every tool. Automate every operation.
→ Desktop app for Windows, Mac, and Linux. No browser needed.
→ One Docker command to self-host everything.
Here's the wildest part:
Adobe Acrobat Pro costs $19.99 per month. That is $239.88 a year.
Acrobat Studio: $24.99 per month. That is $299.88 a year.
Smallpdf Pro: $108 per year.
iLovePDF Premium: $60 per year.
A 10-person team on Adobe pays $2,660 a year to edit documents.
And every single one of those tools processes your files on THEIR servers.
Stirling-PDF processes everything locally. Your files exist on your machine. The server sits on your hardware. The network stays inside your walls.
77,100+ stars. 6,700+ forks. 175 releases. 4,900+ commits. 48% TypeScript and 43% Java.
MIT-licensed core. Self-host it. Fork it. Ship it.
100% Open Source.
(Link in the comments)

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