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Compress Text File

Compress a .txt, .log, .csv or .json to GZIP, ZIP or raw deflate.

  • Free
  • No signup
  • Nothing uploaded
  • No watermark

How to Compress Text File Online

Compress Text File: before and after TXT A BEFORE COMPRESS TEXTFILE TXT A AFTER

Compress Text File takes text you paste or a .txt, .log, .csv or .json you open and writes it out as a .gz, a .zip or a raw deflate stream. Text shrinks a lot, because the same words and patterns repeat and deflate replaces each repeat with a short back-reference; the page shows the size before and after and the percentage saved. Handy for a log file too big to attach to a bug report.

Compresses a .txt, .log, .csv or .json to GZIP, ZIP or raw deflate. Text compresses extremely well — a log file frequently reduces by 90% or more, because the same patterns repeat throughout, which is exactly what these algorithms exploit.

No software to install Free Works on any device

Step-by-Step Guide to Compress Text File

  1. 1. Paste your text, or open a .txt, .log, .csv or .json file

  2. 2. Choose GZIP, ZIP or raw deflate, then press Compress

  3. 3. Download the result

    Nothing is uploaded, so this works on logs you cannot share.

No .txt file to hand? Download a sample text and Markdown file (703 B) and try it.

Try it now

What Does Compress Text File Do?

Compresses a .txt, .log, .csv or .json to GZIP, ZIP or raw deflate. Text compresses extremely well — a log file frequently reduces by 90% or more, because the same patterns repeat throughout, which is exactly what these algorithms exploit.

TXT files

.TXT .LOG .CSV

Compress a .txt, .log, .csv or .json to GZIP, ZIP or raw deflate.

At a glance

  • Takes: Pasted text, or a .txt, .log, .csv, .json, .md or .xml file
  • Gives: GZIP (.gz), ZIP (.zip) or raw deflate
  • Level: 9, the highest deflate setting
  • Shows: Original size, compressed size, percentage smaller
  • GZIP: What web servers send and what .tar.gz wraps
  • Raw deflate: Smallest, but no header or checksum

Why Use File and Archive Tools?

A ZIP from a colleague, a download with no extension or a folder full of badly named files can stop work for a while. These tools unpack, identify, hash and rename files inside your browser, so nothing is uploaded to find out what it is.

“Know what a file is before you open it.”
  • Archives opened without software
  • Downloads checked with hashes
  • Duplicate files found
  • Big files packed smaller
  • Unknown files identified
  • Files renamed in bulk
  • Folders compared quickly
  • Contents never leave your computer

Popular Uses for ZIP and File Tools

These tools help with the small file puzzles that come up every week.

  • Opening RAR files See and extract what is inside an archive on a computer with no unzip program.
  • Checking a download Compare a file’s SHA-256 checksum with the one on the download page.
  • Mystery files Find the real type of a file that has lost its extension or has the wrong one.
  • Renaming photos Rename a folder of camera photos with dates or numbers in one go.
  • Clearing duplicates Find repeated files taking up space in a downloads or photos folder.
  • Sending many files Pack several documents into one ZIP so they travel as a single attachment.
  • Comparing folders See which files differ between a backup folder and the working copy.
  • Reading file details Check a file’s size, dates and hidden metadata before sharing it.

What You Can Do with Compress Text File

Accepts TXT, LOG, CSV, JSON

Understands TXT structure rather than treating the file as bytes

Compression happens on your own machine, at your machine's speed

Reads the archive’s own directory, so a truncated or corrupt file is reported rather than half-extracted

Lists what is inside before anything is written to disk

Why Use ToolXkit for Compress Text File?

Your files stay with you

Everything runs inside your browser. Nothing you open or type is uploaded to a server.

Archive Tools for Different Users

Office workers

Open ZIP attachments and bundle reports together without extra software.

Developers

Check signatures, MIME types and hashes, and create TAR or GZIP files.

IT support staff

Identify strange files and verify downloads before installing anything on a machine.

Photographers

Rename shoots in bulk and find duplicates before backing up a card.

Students

Unpack course material and zip up project folders for submission.

Security-minded users

Check what a file really is before trusting its name or icon.

Best Times to Unpack or Check a File

File tools are useful when you are:

  • Opening an archive on a new computer
  • Verifying a software download
  • Stuck with a file that won’t open
  • Tidying a messy downloads folder
  • Emailing a folder of documents
  • Checking a backup is complete
  • Renaming lots of photos
  • Freeing space on a full drive

Tips and Good to Know

  1. It is for text. A photo, PDF or video will not shrink, and for a bundle of mixed files Compress Files to ZIP is the right tool.

  2. Very short text looks like a poor result because the format’s own header is most of the output. That is overhead, not failure.

  3. One file at a time, through a text box. A multi-gigabyte server log is better compressed with gzip on the machine it lives on.

Frequently Asked Questions

Answers to common questions about this tool.

Do I need to install anything to compress text file?

No. Compress Text File runs entirely in your browser — there is nothing to download, no extension and no desktop program. It works the same on Windows, macOS, Linux, Android and iPhone.

Is it safe to compress text file online?

Safer than the usual alternative, yes. Most online tools upload your file to a server you know nothing about, where it sits until someone deletes it. Here the file never leaves your device — the processing happens in the page itself, so there is no server copy to leak, retain or sell.

What is a checksum and why check one?

A checksum is a short code worked out from a file’s contents. If your copy gives the same code as the one the publisher lists, the file arrived complete and unchanged.

Is there a size limit in Compress Text File?

It depends on your device rather than on the site. Everything is processed in memory in the browser, so a computer handles bigger archives and folders than a phone does.

Is Compress Text File free to use at work?

Yes. It is free for personal and work use with no account. Because files stay on the machine, it also fits workplaces that do not allow uploading documents to outside sites.

Further reading

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