Merge Files Online,
Free & Instant

Combine PDF, CSV, JSON, Markdown, and text files in seconds. No account needed. Nothing uploaded — your files stay on your device.

100% private No sign-up needed Instant results Works in any browser
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Choose a free merge tool

Select the file type you want to merge — all tools are free, unlimited, and run entirely in your browser.

Merge Text Files

Join plain-text files end-to-end

Drop files here

or click to select files from your device

Type a number next to each file to set its position, then click Apply Order

Merge options

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What would you like to do next?

Your merged file is ready. You can add more files to this batch, or start fresh with a new set.

Free online file merging tools — no sign-up required

iMergeFiles gives you a complete set of free tools to merge and combine files online. Whether you need to merge PDF files for a report, combine CSV data exports, join JSON API responses, or stack Markdown documents — you can do it here instantly, with no account and no file size limits.

All processing happens directly in your browser. Your files are never sent to any server, making iMergeFiles one of the most private free file merging tools available online.

Merge PDF files online free

Drag, drop, reorder, and combine any number of PDF files into a single document. Works with scanned PDFs, reports, presentations, and more.

Combine CSV files instantly

Stack rows from multiple CSV files while automatically preserving a single shared header row. Perfect for combining data exports from different date ranges.

Merge JSON files into one

Combine multiple JSON files or API response files into a single unified JSON array. Handles nested objects and arrays.

Join text and code files

Merge .txt, .md, .js, .py, .html, .css, .yaml, and virtually any plain-text format. Use custom separators to keep files clearly divided.

How to merge files online — 3 easy steps

From upload to download in under 30 seconds.

Choose a merge tool

Pick the merge type that matches your files — PDF, CSV, JSON, text, or AI-powered.

Add your files

Drag and drop your files or click to browse. Reorder them exactly how you want the output.

Download the result

Click Merge and download your combined file instantly. No waiting, no server processing.

Frequently asked questions

Common questions about merging files online with iMergeFiles.

No. All processing happens entirely in your browser using JavaScript. Your files never leave your device, so your data stays completely private and secure.
iMergeFiles supports merging PDF files, CSV spreadsheets, JSON data files, Markdown documents, and any plain-text based file including .txt, .js, .ts, .py, .html, .css, .xml, .yaml, and .log files.
Click the "Merge PDF Files" tool card, drag and drop your PDF files into the upload area, arrange them in the order you want, then click the Merge button. Your combined PDF file will download instantly to your device.
Yes, completely free. No account required, no subscription, and no hidden fees. All file merging tools on iMergeFiles are free to use with no usage limits.
Password-protected PDFs cannot be merged directly. You will need to remove the password protection first using another tool, then merge the unlocked PDFs with iMergeFiles.
There is no enforced file size limit. Since all processing happens in your browser, very large files (hundreds of MB) may slow your browser, but for typical everyday files you won't encounter any limits.
Yes. Each file has a number box on the left. Type the position number you want (1 = first) next to each file, then click Apply Order to instantly reorder the whole list. This works even with 50+ files.
AI Smart Merge sends your file contents to Claude (Anthropic's AI) via API to intelligently combine them based on your instructions. Unlike other tools, this feature does send content to an external AI API — use it only with non-sensitive files.
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