Last week I sent a client a PDF quote. I'd used black bars to cover the supplier pricing — but they hit Ctrl+A, copied it all, and saw everything underneath. I've been stuck in this trap too.
That job last week nearly cost me a whole month of work
I do e-commerce copywriting on the side — writing product detail pages for brands. Last week I sent a PDF quote to a client in Hangzhou, and tacked on a page with supplier cost numbers (40% lower than the client-facing price). I drew black rectangles over a few numbers and sent it off — guess what? They hit Ctrl+A, pasted into Word, and those numbers popped out clean as day.
Later I figured it out: PDFs have a "text layer." Those black bars you draw are just an image overlay — the underlying text is untouched. This is called "fake redaction." Sounds technical, but really it's just using the wrong tool.
Real redaction: the free version is enough
That 2025 Google data center water/power data leak — same mistake. Official documents used black bars on sensitive numbers, but the PDF text layer wasn't deleted, and anyone technical copied it all out. It made the front page of Hacker News. I read it and realized I was walking the same tightrope every day.
I use two methods now:
- Minimal setup (free): Open PDF in LibreOffice Draw → select the text to redact → press Delete → export as PDF. 30 seconds total.
- Low-effort option (paid): Adobe Acrobat Pro ($20/month) has a dedicated "Redact" tool. Select with your mouse, and it's actually deleted.
Xiaoli, an independent brand designer in Beijing, took a logo revision project for a listed company last year. Legal required all proposals to use real redaction. She made the same mistake I did at first — then her whole team switched to Adobe Acrobat. No incidents since.
Replication cost: do it tonight
- Money: $0 (LibreOffice method) or $20/month (Adobe method)
- Time: 10 minutes to download LibreOffice, 5 minutes to learn the operation
- Technical barrier: If you can use a PDF, you can do this — easier than sending an email
- First step: Right now, open any PDF on your computer that you're planning to send someone. Open it in Notepad — if you can see text, then even "fake redaction" won't protect it
If you only send a PDF or two a month, you can also just replace sensitive info with "***" or screenshot it. Not everyone needs this. But if your file has prices, contract numbers, or ID numbers — you need to learn this.
Three types of people, three different recommendations
Just starting out / still learning: The most important thing you can do right now — before sending any PDF, open it in Notepad and confirm there's no text layer. 30-second action, saves a major incident.
Got 1-2 steady clients: Install LibreOffice — free, real redaction done in 30 seconds. Run every PDF with prices, ID numbers, or contracts through this workflow.
Scaling up / team of 2+: Just subscribe to Adobe Acrobat Pro Team Edition, $20/person/month. Expensive upfront, but one data breach payout covers 5 years of subscription.