UtilityKit

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Text Files Combiner

Drag-drop multiple .txt files and concatenate them into a single text file with custom separators and ordering.

About Text Files Combiner

Text Files Combiner takes any number of plain-text files and merges them into a single .txt download. Drag and drop the files (or click to select), choose how to separate them — two newlines for paragraph breaks, a single newline, a horizontal rule (---), per-file headers (=== filename ===), or a custom string — and decide whether to keep your selected order, sort by filename, or sort by file size. A live preview shows the combined result with character and line counts before you download. Because the merge happens entirely in your browser, no file ever leaves your device, making the tool safe for confidential documents, draft chapters, exported chat logs, code snippets, or any line-delimited content. The 10 MB per-file cap protects very large datasets from blocking the page.

Why use Text Files Combiner

  • 100% Browser-Side Privacy: Files never leave your device — the merge runs locally so confidential drafts, logs, or notes stay private.
  • Multiple Separator Options: Choose between paragraph breaks, single newlines, horizontal rules, file-name headers, or any custom delimiter you want.
  • Filename or Size Sorting: Reorder files alphabetically or smallest-first without renaming them on disk.
  • Per-File Headers: Insert '=== filename ===' between blocks so you can still tell which content came from which source file.
  • Live Preview Before Download: See the merged output (with char and line counts) before committing to a download.
  • No Signup, No Ads, No Upload: Free and instant — drop files in, get one file out.

How to use Text Files Combiner

  1. Click the dropzone or drag your .txt files into it (multiple files supported).
  2. Pick a separator between files: two newlines, one newline, a divider rule, file headers, or a custom string.
  3. Choose an order: as selected, by filename A→Z or Z→A, or by file size.
  4. Click Preview to see the merged content with character and line counts.
  5. Click Combine & Download to save the result as a single combined.txt file.

When to use Text Files Combiner

  • Combining a folder of chapter drafts into a single manuscript file.
  • Merging exported chat logs, server logs, or note exports into one searchable file.
  • Concatenating multiple CSV exports into a single file (when headers are not duplicated).
  • Joining a set of code snippets or config files into a single review document.
  • Bundling many small text files for upload to a tool that only accepts one file.

Tips

  • If you want chapters in order, name them '01-intro.txt', '02-chapter-one.txt' and pick 'By filename A→Z'.
  • Use the custom separator with a string like '\n=== END ===\n' for visible end markers between files.
  • After combining, run the result through Line Deduplicator if you suspect overlap between source files.
  • The 'File header' separator is the easiest way to keep traceability when merging logs or transcripts.

Frequently Asked Questions

Is the merge done on a server?▾
No. All file reading and concatenation happens in your browser using the FileReader API. Files never leave your device, so confidential content stays private.
What is the maximum file size?▾
Each individual file is capped at 10 MB to keep the browser responsive. There is no hard limit on the number of files you can combine — your browser's memory is the practical ceiling.
Can I reorder the files manually after dropping them?▾
Not by drag — but you can choose 'By filename A→Z', 'Z→A', or 'By size' from the order dropdown. To get a specific custom order, rename files before dropping or select them in the order you want with 'As selected'.
What separator should I use between files?▾
Two newlines is best for prose (creates a paragraph break). Use the horizontal-rule option ('---') for visible visual breaks. Use 'File header' to label each section with the filename. The custom option lets you specify any string, including '\n' for newline.
Will the tool change the encoding of my files?▾
Files are read as UTF-8 text and written back as UTF-8. If a source file uses a different encoding (e.g. Windows-1252), characters may be misinterpreted. Convert files to UTF-8 before merging if you see garbled output.
Can I combine non-.txt files like .md or .csv?▾
Yes — the input accepts any plain-text file. The dropdown allows .txt, .md, .log, and .csv. The result is always saved as 'combined.txt' but you can rename it after download.
Does the tool deduplicate identical lines?▾
No — this tool only concatenates. To remove duplicate lines, run the combined output through the Line Deduplicator tool afterward.

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