PenguinPDF

The PDF editor
that works.

Annotate, fill forms, sign, and export. Annotations created in PenguinPDF open correctly in Adobe Reader, Chrome, and Apple Preview.

Get it on Google Play

Capabilities

Everything you need.
Nothing you don't.

Focused PDF tools that do exactly what you'd expect, without the bloat.

✏️
Annotate

Ink, highlight, notes, free text — stored as real PDF annotations, not image overlays. Opens in any PDF reader.

💾
Autosave

Never lose work. PenguinPDF saves in the background automatically using crash-safe atomic writes.

📝
Form Filling

Fill AcroForm fields and JavaScript-calculated forms. Works with government forms, contracts, and tax docs.

✍️
Signatures

Draw or type your signature and embed it permanently in the PDF — portable across every reader.

🗜️
Flatten

Lock annotations permanently into the page so nothing shifts or disappears when you share the file.

📤
Export

Share your annotated PDF to email, Drive, Dropbox, or anywhere else — in one tap.

Pricing

Simple, honest pricing.

Start free. Upgrade when you're ready. Less than a coffee a year.

Try it first

3-Day Trial

Free

Full Pro access for 3 days.
No credit card required.


  • All Pro features unlocked
  • No ads during trial
  • No payment info needed

Best value

Pro

$3.99 / yr

Under 34¢ per month.
Cancel any time.


  • No ads — ever
  • Ink & annotation tools
  • Form filling
  • Signatures
  • Flatten & export
  • Priority updates

Always free

Free

$0

Core features, ad-supported.
No time limit.


  • PDF viewing
  • Basic annotations
  • Form filling
  • Signatures (Pro)
  • Flatten & export (Pro)
  • Ad-free experience (Pro)