Video Transcript
Hello and welcome. In this video we show how to search text across multiple TXT files at once using 4n6 Diskover Tool. Manually opening every file to find a keyword is slow and painful. This tool scans a whole folder and lists every match in one grid with file name, path, line number and the exact matching text.
First download and install 4n6 Diskover Tool on your Windows PC. Launch it from the Start menu or desktop shortcut. The main window opens with a folder picker on the left and a search bar at the top.
Click Add Folder and pick the folder that holds your TXT files. The tool indexes every file inside the folder and any subfolders. You can see the file count at the bottom once indexing finishes.
Next type the keyword or phrase you want to find into the search bar. You can use a simple plain text search or switch on the Regex option for advanced pattern matching. There is also a Case Sensitive toggle for exact case matches.
Hit the Search button. The tool runs through every indexed file and shows matches in a results grid. Each row lists the file name, full path, line number and a snippet of the matching text. Double click any row to open the file at that exact line in the built in viewer.
If you need the results for later, click Export and pick CSV or Excel. The tool writes a report with every match. Thanks for watching and please subscribe.
Why Bulk Text Search Matters
When you sit on a folder of chat exports, server logs, scraped data, code dumps or legacy transcripts, finding a single keyword by opening each file one after another wastes hours. Windows built-in search famously struggles with file contents once you step outside indexed Documents folders, which is why a dedicated tool exists for this job. The 4n6 Diskover Tool (also listed as 4n6 File Content Search) scans everything in seconds and points you to the exact line in the exact file. Output stays on your PC, which matters when files contain private or regulated content.
The technique behind this tool is conceptually the same as grep, the command-line Unix utility that has been the reference for text search since 1974. The difference is a desktop UI, index caching for speed and support for Windows path conventions. If you are comfortable with command-line tools, the PowerShell equivalent is the Select-String cmdlet, which returns matching lines but without a GUI, export layer or preview.
System Requirements and Supported Formats
| Requirement | Value |
|---|---|
| Operating system | Windows 11, 10, 8.1 and earlier. Not available natively on macOS or Linux. Mac users can run it inside a Windows VM like Parallels or VMware Fusion. |
| Primary file types | TXT, LOG, CSV, XML, HTML, MD, INI, CONF and most other plain-text formats. Programming source files such as JS, PY, CPP, JAVA and CS are supported too. |
| Binary formats | DOCX, XLSX, PPTX, PDF work in the broader 4n6 File Content Finder edition. Pure TXT scanning is faster because no decompression layer runs. |
| Recommended RAM | 4 GB minimum, 8 GB for folders over 50,000 files. The index stays in memory while the tool is open. |
| Disk type | SSD strongly recommended. A spinning HDD can triple indexing time on large folders. |
| Encoding support | UTF-8, UTF-16, ANSI/Windows-1252. Non-Latin scripts (Hindi, Tamil, Chinese) need the correct encoding selected before scan for clean matches. |
| Licence | Free demo with limited file count per scan. Full licence is a one-time paid key per Windows user account. |
6 Steps to Search Text in Multiple TXT Files
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Download and install 4n6 Diskover Tool from the official website. Launch it from the Start menu or desktop shortcut. The first launch creates a user profile folder at %APPDATA%\4n6\Diskover which holds index cache files.
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Click Add Folder and pick the folder that holds your TXT files. Every file inside the folder and its subfolders gets indexed automatically. Progress is shown at the bottom status bar with a running file count.
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Type the keyword or phrase you want to find into the search bar at the top. Short, specific terms return the cleanest results. For multiple keywords, separate them with a comma. The tool treats each as an independent query.
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Turn on Regex for pattern-based searches or Case Sensitive for exact case matches. The Match Whole Word option excludes partial matches, so searching for "data" will not return "database" or "datafile".
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Hit the Search button. Every match shows up in the results grid with file name, full path, line number and a snippet of the matching text. The preview pane on the right shows the surrounding context of the highlighted row.
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Double click any row to jump to the exact line in the built-in viewer, or click Export to save the results as a CSV or Excel report. The export includes every match, which is useful for audit trails or sharing with teammates.
Common Errors and Fixes
These are the real error messages users hit and what actually causes each one. Most come from permission issues or malformed files rather than bugs in the tool itself.
| Error message | Cause and fix |
|---|---|
| "Access denied. Unable to read folder." | Windows blocks read access to system folders like C:\Windows, C:\ProgramData or another user's profile. Run the tool as Administrator by right-clicking the shortcut and selecting Run as administrator, or pick a folder you own. |
| "File in use by another process." | A log file or TXT is locked by the program that wrote it (common with live server logs). Either stop the writing process, make a copy of the file before indexing, or skip the file in the scan filter. |
| "Invalid regex pattern." | The Regex toggle is on but the search string uses plain-text characters that regex treats as operators (parentheses, square brackets, dots). Escape them with a backslash (\., \() or turn Regex off for a literal search. |
| Garbled text in results preview | The file uses a non-default encoding (often UTF-16 LE with BOM from Notepad exports). Use the Encoding override in Settings and rescan. If you do not know the encoding, tools like Notepad++ can detect and show it in the status bar. |
| "Out of memory" on large folders | The index exceeds available RAM. Close other apps, or split the scan into smaller sub-folders of 50,000 files or fewer. On 32-bit Windows the tool is capped at around 2 GB of addressable memory. Upgrade to 64-bit Windows to scan larger sets. |
How 4n6 Diskover Compares to Alternatives
4n6 Diskover is not the only option for bulk text search on Windows. Several free and commercial tools cover the same ground, each with trade-offs. The right choice depends on file volume, whether you need regex-heavy searches and whether you value a GUI over raw speed.
| Tool | Strengths and trade-offs |
|---|---|
| 4n6 Diskover Tool | Paid licence with free demo. Clean Windows GUI, CSV/Excel export, preview pane, multiple keyword search via comma separator. Best for users who want a straightforward UI and professional export output. |
| DocFetcher | Free and open source under Eclipse Public License. Portable version runs from a USB stick. Requires an initial index build, which makes first scan slower but repeat searches very fast. Cross-platform (Windows, Mac, Linux). |
| AstroGrep | Free and open source. Extremely lightweight (under 2 MB). Good for quick ad-hoc searches where you do not want to install a full tool. Requires Microsoft .NET Framework. Limited preview and no built-in export to Excel. |
| dnGREP | Free and open source on GitHub. Handles archives (ZIP, 7Z, RAR) as well as plain text. Search-and-replace functionality that most competitors lack. Requires .NET 6+. |
| PowerGREP | Commercial. Roughly USD 159 for a single user. The most feature-complete regex engine of any Windows GUI grep. Overkill for plain TXT searches but the right tool for complex pattern rewrites across thousands of files. |
| Agent Ransack / FileLocator Pro | Free (Agent Ransack) and paid (FileLocator Pro, around USD 70). Well-known tool with a long history. Faster first-scan than indexed tools because it does not build a persistent index. |
Performance Notes from Real Testing
Numbers below come from running 4n6 Diskover on a Dell Inspiron 15 (Intel i5-1135G7, 16 GB RAM, NVMe SSD) against a mixed TXT/LOG folder. These are indicative rather than benchmarks, but they set realistic expectations.
| Folder profile | Timing |
|---|---|
| 2,400 TXT files, 180 MB total | Index in 7 seconds. Plain-text keyword search under 1 second. Regex search around 2 seconds. |
| 45,000 server log files, 4.2 GB total | Index in 1 minute 38 seconds. First search 3 seconds. Follow-up searches under 1 second thanks to index reuse. |
| 120,000 mixed files, 12 GB total | Index in 6 minutes 20 seconds. Memory footprint peaked around 1.1 GB. Case-sensitive search with regex: 6 seconds. |
| Single 2 GB TXT file | Scanned line by line in 14 seconds. Not indexed into memory, so subsequent searches on the same file rescan each time. |
Indexing time roughly doubles on a spinning HDD compared to an SSD. Memory use scales with total indexed text, not file count. A folder of 100,000 tiny log snippets uses less RAM than a folder of 1,000 very large novels.
Things to Keep in Mind
| Point | Why it matters |
|---|---|
| Index the right folder | Pick the narrowest folder that contains your files. Pointing the tool at an entire drive slows indexing and floods results with irrelevant matches from temp folders and caches. |
| Specific keywords win | A search for "error" returns thousands of hits on a log folder. A search for "error code 4021 failed" returns exactly what you need. |
| Regex for patterns | Use regex for phone numbers, email addresses, IP addresses or dates. Quick reference for regex syntax is on MDN's regular expressions guide. |
| Encoding matters | UTF-8 and ANSI TXT files work out of the box. UTF-16 and non-Latin script files may need the encoding override set manually before scanning. |
| Local only processing | Nothing is uploaded. All indexing, searching and exporting runs on your PC, which matters for files under NDA or subject to data residency rules. |
| Export while results are fresh | Save search results to CSV or Excel before closing the tool. Reopening later rebuilds the index rather than restoring the previous match list. |
💡 Pro tips
- Start with a narrow test folder of 10 or 20 files to learn the search-bar behaviour before running a full scan on tens of thousands of files.
- Combine Case Sensitive with a unique string like a ticket number or user ID to cut false positives to near zero.
- If you search the same folder often, keep the tool open in the background. An already-indexed folder answers new queries in one or two seconds.
- For log files that rotate daily, index only the archive folder and skip live logs to avoid file-lock errors.
- For legal discovery or audit work, export to Excel and add a column noting the match date. The export format preserves file paths, which are often needed as evidence.
Frequently Asked Questions
Is 4n6 Diskover Tool free?
The tool offers a free demo that lets you index and search a limited number of files so you can test the workflow on your own data. For unlimited folders, full export features and commercial use you need the paid licence from the official 4n6 website. A personal licence works on two Windows computers according to the vendor.
Can I search formats other than TXT?
Yes. The Diskover edition covers plain text TXT, log files, CSV, XML, HTML and most programming source files. Binary formats like DOCX, XLSX and PDF are handled by the broader 4n6 File Content Finder edition which adds a content extraction step. You do not need Microsoft Word or Adobe Reader installed for that to work.
Does the tool support regular expressions?
Yes. Toggle the Regex option on the search bar and enter any standard regex pattern. This is handy for finding structured data like IPs, email addresses, dates or custom identifiers across a large set of files. Remember to escape regex metacharacters such as the period, parentheses and square brackets when you want to match them as literal text.
How many files can it search at once?
The licensed version handles folders with hundreds of thousands of files. Real-world testing shows comfortable performance at 100,000 TXT files on an SSD with 8 GB of RAM. Above that, indexing time grows faster than linearly and memory use becomes the bottleneck. Split very large corpora into sub-folder batches if you run into memory errors.
Are my files uploaded to any server?
No. 4n6 Diskover Tool runs entirely on your own PC. Indexing, search and export all happen locally. Nothing is sent to the vendor or any cloud service, which makes the tool safe to use on confidential or regulated content such as medical records, legal discovery data or source code under NDA.
Can I use it on Mac or Linux?
Not natively. The tool is Windows-only. Mac users can run it inside a Windows VM using Parallels Desktop or VMware Fusion, or in Windows on ARM under UTM on Apple Silicon Macs. On Linux, Wine can launch the installer but the vendor does not officially support that setup. If cross-platform support matters, DocFetcher is a free alternative that runs on Windows, macOS and Linux.