How to search inside PDFs on iPhone

Last reviewed: September 1, 2026 · Markdown version

There are two different questions hiding in this one, and they have two different answers. Searching inside one PDF you already have open is something a phone handles on its own. Searching across a shelf of PDFs, or searching a scan, is where the built-in routes run out — not because anything is broken, but because a reader searches the document in front of it.

One file: open it and use find

Whatever you read PDFs in, the reader has a find function — usually a magnifying-glass icon, sometimes an item in a menu. Type the word, step through the matches, done. For a document you already have open this is the right answer and no app is needed.

It stops helping in two specific places:

• You don't know which file it's in. A find function searches the open document. Forty statements means opening forty documents, and doing it again for the next question. The structural version of this problem.
• The page is a scan. A scanned page is a photograph of text: no words are stored in the file, so find honestly returns nothing even though the word is printed right there. How to tell in ten seconds.

A library of files: something has to index them

The fix for both is an index — every document read once up front, every word recorded in a searchable table, so one query checks the whole library rather than one open file. Scans have to be handled on the way in, by running OCR and folding the recognized words into the same index. That's the job a dedicated search app does on a phone.

DocFind on iPhone

DocFind is that app, built to be honest about what it can and can't read.

• Search inside many PDFs at once — results show the file, the page, and the surrounding text, so you can see which hit is the one you meant before opening anything.
• Tap a result to open that PDF at that exact page, with your keywords highlighted.
• Scanned PDFs too. DocFind reads them on your device using Apple's Vision framework, then searches them like any other document.
• It works offline, and it stays yours. Searching, indexing, reading scanned pages and exporting all work with no internet connection. Your documents never leave your device. No ads. No analytics. No tracking.
• It tells you what it missed. If a file can't be opened, hasn't been read yet, or has changed since it was indexed, DocFind names it and says why — so an empty result means the word isn't there, not that something quietly failed.
• Try the demo — sample documents, no setup. The whole flow, including a scanned page, without adding a single file of your own.

On iPhone there's also an advanced query mode for searches that need structure — AND, OR, NOT and exact phrases — and a regex mode for the patterns a plain keyword can't express. Both are part of DocFind Pro.

Related: Search many PDFs at once · Make a scanned PDF searchable · Search for a word in a PDF · The Android version of this page