Sofia Chen
Small Business Technology Writer
About Sofia Chen
Sofia covers technology solutions for small businesses and freelancers, with a focus on free tools that save time and money.
Articles by Sofia Chen
How to Sign a PDF Free Online — No Adobe, No App (2026)
Sign PDF documents online free without Adobe Acrobat. Draw your signature, upload your PDF, download signed. Works on iPhone, Android, Windows and Mac.
May 13, 2026
How to Remove Password From a PDF Free (2026 Guide)
Unlock and remove password protection from any PDF you own. Free online method — no software, no sign-up. Works on Windows, Mac, iPhone and Android.
May 15, 2026
How to Compress PDF on iPhone and Android Free (2026)
Compress large PDF files on your iPhone or Android phone for free. No app download needed — use your mobile browser. Step-by-step guide with screenshots.
May 16, 2026
How to Add a Watermark to a PDF Free Online (2026)
Add text watermarks to PDF files online free. Mark documents as CONFIDENTIAL, DRAFT or with your company name. No software, instant results.
May 17, 2026
How to Redact a PDF Free Online — Permanently Remove Text (2026)
Properly redact sensitive information from PDF files online for free. Covers HIPAA, legal, and personal document redaction. True permanent removal — not just a black box.
May 18, 2026