How to Search Files by Content on Windows and Mac: Built-in Methods and Where They Fall Short (2026)

Last updated: 3 November 2026

Short answer: both systems can search inside files, but only for files they have indexed, and only for content they can read as text. On Windows, check that the folder is indexed and that the file type is set to index contents, or switch on File Explorer’s option to search file names and contents. On a Mac, Spotlight and Finder search the index of documents Apple builds on your device. A word index is not built to find a photo from a description or a spoken sentence in a recording (Copilot+ PCs and the Mac Photos app add some description-based image search of their own, with limits covered below). For those cases this guide ends with a local AI option, AIFindTool.

Disclosure: AIFindTool is made by PandaWM, the publisher of this site. Facts about AIFindTool come from its product page; facts about other tools come from their official documentation, linked at the end.

1. Searching inside files on Windows

Windows Search keeps an index: according to Microsoft, indexing looks at files, email messages and other content and catalogs “their information, such as the words and metadata in them”. After the first run, which Microsoft says can take up to a couple of hours, indexing continues in the background and only re-indexes updated data (Microsoft Support).

• Check the mode. Windows offers Classic mode (Documents, Pictures, Music and the desktop by default) and Enhanced mode (your entire PC). If your files live in other folders, Classic mode will not index them unless you add the folders.
• Check the file type setting. Microsoft explains that you can index “properties only” or “properties and content” for a file type. With properties only, you can still search by file name, but not by contents.
• Non-indexed folders. In File Explorer Options, on the Search tab, there is a setting to always search file names and contents. Answers on Microsoft Q&A (written for Windows 10) describe it, and it can be slow because it reads files directly (Microsoft Q&A).

Third-party tools work differently. Everything by voidtools indexes file and folder names and finds them almost instantly, but its FAQ says file contents are not indexed in the stable 1.4 line, so a content: search is slow (Everything FAQ). The Everything 1.5 beta adds optional content indexing, which keeps the text in memory and is meant for user documents (voidtools forum).

2. Searching inside files on a Mac

Spotlight is Apple’s system-wide search. Apple describes its index as local and private, covering files, folders and apps and “a wide range of content such as documents, email, text messages, contacts, photos, music, podcasts, notes”. Indexing can take hours or even days on the first run, and Spotlight settings let you choose which kinds of content are included (Apple Support).

In Finder you can narrow a search with criteria, for example trip kind:document to search for the word “trip” in documents only, or author:tom. Several criteria are combined so that an item must match all of them (Apple Support: narrow your search results in Finder). If something is missing, Apple suggests checking which content types are enabled and, for a stubborn folder, re-indexing it by adding and removing it in Spotlight’s privacy list.

3. Where built-in methods fall short

• You need the words. Index-based search matches terms. If you remember the idea (“the invoice with the late fee”) but not the wording, you are guessing keywords.
• Words that exist only as pixels or sound. A screenshot of an error, a scanned contract or a voice memo has no text for a word index to catalog unless something has already extracted it. Microsoft’s semantic indexing on Copilot+ PCs covers some image formats (.jpg, .jpeg, .png, .gif, .bmp, .ico) and is optimised for English, French, German, Spanish, Japanese and Simplified Chinese. Other languages fall back to traditional indexing.
• Folders outside the index. External drives, archives and folders you never added are invisible until indexed.
• Waiting for the first index. Both Microsoft and Apple warn that first-time indexing can take hours or more.
• Different tools per OS. Windows, macOS and Linux each behave differently, which is awkward if you work on more than one.

How AIFindTool searches: three steps

AIFindTool is PandaWM’s local AI file search app. It reads the folders you choose (pictures, PDFs, documents, recordings, video and, optionally, code), builds an index on your own computer and lets you search with the phrase you remember. The result opens at the page or the moment that matches.

1. Choose folders. Point it at the places where you actually keep files.
2. Index on this machine. Files are parsed and indexed locally. Long files are indexed from the start first and finished in the background. The first run also downloads the EmbeddingGemma 2 model once.
3. Search in a sentence. Type something like “that payment error” or “a dog on the beach”. Results open on the right page or at the right second.

What you can ask for

• Pictures and screenshots: “that payment error”, “a dog on the beach”. It matches the picture, not just the name.
• PDFs and documents: “the clause about pets in the lease”. Long files start at the front and finish in the background, then open on the page.
• Audio and video: “where they talk about sleep”, “the zebra in the video”. The result lands on that minute.
• Code: Optional. Start with code: and describe what the function does. It opens in your editor on the line. Off until you turn it on.

Code search is optional and stays off until you turn it on in Settings; start the query with code: and describe what the function does. Platforms: macOS 14+ (Apple silicon), Windows 10/11 (beta), Linux Ubuntu 24.04+ (beta, AppImage) and Android 8.0+ arm64 (beta).

What it can read, and what it cannot

The product page lists 90+ formats. In short:

• PDF: Full-text search; scanned pages are searched by visual content; OCR for garbled text layers.
• Documents: Word (including legacy .doc on all platforms), Pages, OpenDocument, RTF, plain text, Markdown, HTML.
• Slides & spreadsheets: PowerPoint, Excel, Keynote, Numbers, OpenDocument. Slides indexed one by one (with notes), sheets one by one.
• Images (~25): Searched by what’s in the picture, e.g. “photos at the beach”. Screenshots recognized separately; camera RAW via the embedded preview.
• Audio (~16): Recordings, meetings, podcasts; results jump to the moment.
• Video (~15): Searched by picture and sound; results jump to the moment.
• E-books: EPUB indexed chapter by chapter; MOBI / AZW / AZW3 without DRM.
• Email: Outlook .msg and standard .eml: subject, sender, recipients, date and body. Attachments are not read yet.
• Archives: Files inside zip, tar, gz and tgz archives are searchable. rar and 7z are not supported.
• Code & data: Spreadsheets, config, logs and source code in common languages. Enable in Settings.

Not supported

• Password-protected (encrypted) Office files
• E-books with DRM
• rar and 7z archives
• Email attachments (messages are read; attachments are not yet)

PandaWM does not publish speed or accuracy figures for AIFindTool, so this article quotes none. Try it on a folder you know well before you rely on it.

Privacy: what stays on your computer

The index is local. The app goes online to download EmbeddingGemma 2 once, to check AIFindTool’s own updates, and — only if you opt in — to send anonymous usage counts. Those counts are launches, searches, and how many files of each type were indexed, plus a random install id and the version. Never file contents, names, paths, or search text.

EmbeddingGemma 2 is from Google DeepMind. Review its terms before commercial use. The app’s MIT license does not cover the model.

4. Which method should you use?

• Looking for a file name: File Explorer, Finder or Everything.
• Looking for an exact word in documents: the built-in index, once you have confirmed that the folder and file type are indexed.
• Looking for something you can only describe (a picture, a page, a moment in a recording): a local AI search tool such as AIFindTool, alongside the built-in tools rather than instead of them.

Frequently asked questions

How do I search for text inside files in Windows 11?

Make sure the folder is part of the search index (Classic or Enhanced mode) and that the file type is set to index properties and file contents. For folders that are not indexed, File Explorer Options has a Search setting to always search file names and contents, which can take several minutes.

Why does Windows search not find words inside my document?

The usual causes are that the folder is not indexed, that the file type is set to index properties only, or that the first index is still being built (Microsoft says it can take up to a couple of hours). A scanned PDF with no text layer has no words to find.

How do I search inside files on a Mac?

Use Spotlight (Command-Space) or a Finder search. Spotlight searches its local index of documents and other content, and Finder lets you add criteria such as kind:document. If a folder is missing, check Spotlight settings and re-index it through the privacy list.

Can I search inside a scanned PDF or an image?

Not reliably with a word index alone, because there may be no text to index. A local AI search app can search images and scanned pages by what they show; AIFindTool does this and OCRs pages whose text layer is garbled.

Are my files uploaded anywhere?

No. Files are parsed and indexed on your computer. The app goes online only to download the model once, to check for its own updates and, only if you opt in, to send anonymous usage counts.

Which files can AIFindTool not read?

Password-protected Office files, DRM-protected e-books, rar and 7z archives and email attachments.

Which systems does it run on?

macOS 14+ (Apple silicon), Windows 10/11 (beta), Linux Ubuntu 24.04+ (beta, AppImage) and Android 8.0+ arm64 (beta). The Android build searches SMS and photos rather than desktop files.

Do I need an internet connection?

For the one-time model download, yes. After that, searching runs on your computer. According to the product page the app uses the network only for that download, for update checks and, with your consent, for anonymous usage counts.

Sources

• Microsoft Support: Search indexing in Windows
• Microsoft Q&A: finding file contents in Windows Search
• Apple Support: About Spotlight indexing
• Apple Support: Narrow your search results in Finder
• Everything FAQ (voidtools)
• voidtools forum: Everything 1.5 content indexing
• AIFindTool product page

Facts about other tools were checked on 3 November 2026. Menus and features change, so confirm against the current official page. Facts about AIFindTool come from the product page.

Related reading

• Best desktop search tools for Windows and Mac (2026)
• AI photo finder: find a photo on your computer by describing it