You can edit PDFs on iPhone without downloading any app — just open Safari and use a browser-based tool. Here is what you can do and how to do it.
Open Safari and go to pdfeditor.onl. The full suite of PDF tools works in mobile Safari with no app installation.
PDF Studio for editing: tap the PDF Studio card and upload your PDF. Add text, draw, erase content, add images. Sign PDF for signing: tap Sign PDF, upload, draw your signature with your finger. Compress PDF for reducing file size: tap Compress PDF, upload, choose compression level.
Tip: On iPhone, landscape mode gives more screen space when drawing or placing signatures.
After downloading the edited PDF, use the iOS Share sheet to send via Mail, WhatsApp, AirDrop, or save to Files or iCloud Drive.
With pdfeditor.onl in Safari: add text, erase content, draw annotations, add images, sign, compress, merge, split, rotate, OCR, convert, compare, watermark, and more.
iOS offers basic markup (drawing, highlighting) in the Files app. For adding text, compressing, merging, signing formally, or converting, you need a more capable tool like pdfeditor.onl.
Yes — all tools are completely free in Safari on iPhone.