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File Merger

Join file pieces (or any files) back into one, in the order you set.

10 / 10 free files today

Related tools

All Archives & splitting tools →
Create a TAR fileBundle several files into an uncompressed .tar, the archive Unix tooling expects.Create a ZIP fileBundle several files into one ZIP, choosing how hard to compress them.File SplitterCut any large file into pieces — of a fixed size, or into a number of equal parts — then download them together and rejoin them later.SRT subtitle mergerCombine two SRT subtitle files into one, cleanly renumbered. Append mode shifts the second file to start after the first one ends, plus an optional gap — ideal for joining subtitles of two video parts. Overlay mode keeps both original timings and sorts every cue chronologically, for merging two subtitle tracks.Split an Excel fileBreak a workbook into one .xlsx file per sheet, downloaded separately.Archive extractor (ZIP, TAR, GZIP)Open a ZIP, TAR or GZIP archive and download any file inside it, one by one.TAR to ZIPRepack a .tar, .tar.gz or .tgz archive as a ZIP that Windows opens without extra software.ZIP to TARRepack a ZIP as an uncompressed .tar, the format most Unix tooling expects.

File Merger works straight from this page — free, instant, nothing to install. It sits under Archives & splitting in our catalogue, alongside Create a TAR file and Create a ZIP file.

How to use it

  1. Open the tool — no signup or install needed.
  2. Enter your input or adjust the available options.
  3. Get your result instantly, then copy or download it.

Frequently asked questions

What does File Merger do?

Join file pieces (or any files) back into one, in the order you set.

When would I actually use this?

Bundling several files into one to send, opening a ZIP or a TAR without installing anything, and cutting a file that exceeds an attachment or upload limit into pieces that can be put back together.

What is the most common mistake?

Treating the parts of a split file as files. A piece is a slice of bytes, not a smaller version of the original: it opens as nothing, and the whole is recoverable only if every part is present, unrenamed and in order. Losing one part loses the file.

How is File Merger different from Create a TAR file?

They sit next to each other but answer different questions. Create a TAR file: bundle several files into an uncompressed .tar, the archive Unix tooling expects. Pick whichever matches what you're starting from — both are free.

Is there a tool for the next step?

Create a ZIP file is the closest one after this: Bundle several files into one ZIP, choosing how hard to compress them.

What else is worth having open alongside it?

File Splitter and SRT subtitle merger — they come up in the same task often enough to be worth a second tab.

Where do the figures come from?

ZIP and TAR are open container formats with published layouts, and both are read and written here in the browser. A container records names, sizes and order; it does not record who made it or whether the contents are what they claim, so the container is a wrapper, never a guarantee. The parts a splitter writes record nothing at all: they carry no header, and a merger restores the original only if every piece is present and in order.

Further reading

All guides →
How-toSplitting a File That Is Too Big to SendThe last resort when nothing can be compressed further. It works, and it has three sharp edges: the parts are useless on their own, the order is absolute, and the megabyte you set is not the megabyte the limit means.ComparisonZIP or TAR: Which One, and Why It MattersOne structural difference explains everything else: TAR does not compress, it only stacks; ZIP compresses each file on its own. Measured on 60 small source files, that is the difference between 1,809 bytes and 14,686.How-toOne File per Tab, and What a Split Leaves BehindSplitting a workbook writes one .xlsx per sheet, named after the tab. It carries the values across and not the formulas — which is the right default when the point is to send one department its own tab.ExplainerWhy Compressing a File Twice Does Not Halve It TwiceThe first pass takes 30% off and the second takes nothing. That is not a broken tool — it is the difference between removing redundancy and removing information, and knowing which one you are doing tells you when to stop and what a second attempt actually costs.How-toMerging Workbooks: One Sheet Each, or One Table for AllTwelve monthly reports can become twelve tabs or one table of twelve months. Only the second can be sorted and summed in one go — and it is the one where the header rows need handling.How-toMerging Two Subtitle Tracks Into a Bilingual Version: What Actually Happens to the CuesCue 12 of the English track is not cue 12 of the French one, because translators split and join sentences differently. Two strategies exist for pairing them; this merger uses neither — it interleaves. Here is what that gives you and when it is good enough.