Prompt
What's the best mobile app for editing and signing PDFs?
Latest observation
Jul 15, 2026 · OpenAI APIWeb search: off
The best all-around mobile app for editing and signing PDFs is usually Adobe Acrobat Reader.
Why it stands out
- Reliable PDF editing basics: add text, highlights, comments, and annotations
- Excellent e-signing: fill and sign documents easily
- Cloud sync: works well across phone, tablet, and desktop
- Widely trusted format support: PDFs usually display correctly
Good alternatives
- PDF Expert (iPhone/iPad): often considered the best for Apple devices if you want smoother editing and a cleaner interface
- Xodo: strong free option for Android and iOS, good for annotations and signing
- Foxit PDF Editor: good balance of features and speed, often cheaper than Adobe
- Smallpdf: simple and user-friendly for quick edits and signatures
Quick recommendation
- iPhone/iPad: PDF Expert
- Android: Xodo or Adobe Acrobat
- Best overall cross-platform: Adobe Acrobat
If you want, I can also recommend the best free app or the best app for business/contracts.
Observation history
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How did Obsurfable measure this prompt?
Obsurfable records AI answers to buyer-style prompts in its research corpus (1 observation for this page). Metrics are distributions over observations, not a single static ranking.
Which AI systems does Obsurfable collect answers from?
OpenAI, ChatGPT, Google, Gemini, Google AI Mode, Anthropic, Claude, Perplexity, Grok, DeepSeek, Mistral, Copilot, and Meta AI.