Merge Files

What is File Merging?

File merging is the process of combining multiple files into a single file in a specified order or sequence. Used for data consolidation, log aggregation, CSV/text merging, and report generation. Developers merge log files; data analysts combine CSV chunks into one dataset; users assemble scattered text segments into a single document.

PdfMetric's File Merge tool combines your selected files in sequence into one output file. All processing happens in your browser; your files are never uploaded to any server. CSV, TXT, JSON, XML, log files, or any text-based format can be merged. Merge order follows your file selection order; you can reorder as needed.

How Does File Merging Work?

The merge process reads files in the selected order and concatenates their contents into one target file. An optional separator — newline, comma, or custom character — can be inserted between files. For CSV files, typically the first file's header row is kept and duplicate headers from other files are skipped, producing a single valid CSV output.

For log merging, sorting by timestamp can produce a chronological log file. Binary files can also be merged; however, format compatibility is the user's responsibility.

When Should You Use It?

• Log aggregation: Combine log files from multiple servers or applications into one file for analysis.
• CSV merging: Reassemble a large CSV after splitting and processing, or combine multiple CSVs into one dataset.
• Text documents: Merge section-by-section reports, chapters, or notes into a single document.
• Reassembling split files: Put back together files that were split with a split tool.
• Data consolidation: Combine data files from different sources into one file.

Technical Details

Merging can be done with streaming in memory, allowing very large files to be processed. For CSV merging, the delimiter (comma, semicolon) is preserved. Header handling: the first file's header is kept; duplicate headers in subsequent files are skipped. Order preservation is important; file order determines the output's meaning.

Advantages

• 100% privacy: Files are processed in the browser and never uploaded.
• Order control: You can set the merge order by selection.
• Separator support: Delimiter between files can be added.
• Multiple formats: CSV, TXT, log, and other text formats.
• No installation: A web browser is sufficient.

Frequently Asked Questions

1. Select files: Upload or select the files to merge, in the desired order.
2. Adjust order: Reorder files by dragging if needed.
3. Choose separator: Optionally set a delimiter (newline, comma) between files.
4. Merge: Click "Process" and download the merged file.

Tip: Ensure the first CSV file has a header. For log merging, timestamp sorting helps with chronological analysis.