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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.Extract a ZIP fileOpen a ZIP, TAR or GZIP archive and download any file inside it, one by one.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.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 an archive 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 is the one to open when you need it to 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?

Extract a ZIP file and File Splitter — 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 an archive is a wrapper, never a guarantee.

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.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 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.How-toOut-of-Sync Subtitles: How to Measure the Offset and Shift an SRT by an Exact Number of SecondsMeasure the offset at two points instead of guessing it once. If it is constant, one shift fixes the file. If it grows, it is a frame-rate mismatch — 25 fps against 23.976 drifts 2.5625 seconds every minute — and no shift will ever fix that.How-toSubtitles to a Spreadsheet, and Back: What Survives the Round TripA comma is quoted, a quotation mark is doubled, and a two-line cue keeps both lines — verified byte-identical over three consecutive round trips. What can still change your file is the spreadsheet in the middle.