Free RAR to 7Z Converter: No Sign-up, Files Never Uploaded
Convert RAR to 7Z free, right in your browser. There is no sign-up or login, no watermark, and nothing is uploaded: your archives never leave your device.
The archive is opened, its files are read one by one, and they are packed again as 7Z.
Depending on your browser, this pair can need a conversion engine, a one-time download of about 1.5 MB. The page shows the size before it starts, and your browser keeps the engine for next time.
- Free
- No sign-up
- Never uploaded
- No watermark
Your files are converted on your device and never uploaded.
How to convert
- Add your RAR files by dragging them onto the converter or by using the file picker.
- Check that 7Z is the selected target format; it is already chosen on this page.
- Open the options if you want to change compression level, or keep the defaults.
- Press Convert and watch the progress shown for each file.
- On the first run the page may pause while the conversion engine downloads.
- Download each result, or take them all together as one ZIP when you converted several files.
Features
- Reads .rar and writes .7z.
- Free, with no watermark added to the result.
- No sign-up and no login.
- Your files are never uploaded and never leave your device.
- Batch conversion with a ZIP download for several results.
- The input is recognised by its content, not only by its file name.
- A one-time engine download is cached by your browser.
Supported formats
| Format | Read | Write | Notes |
|---|---|---|---|
| RAR.rar | Yes | No | RAR is a proprietary format: its encoder is not available, so RAR files can be opened but not created. |
| 7-Zip (7Z).7z | Yes | Yes | Archive format of the 7-Zip tool, usually the smallest of the common formats. |
About the formats
About RAR
Archive format created by Eugene Roshal for the WinRAR tool.
Strong compression and recovery records.
About 7Z
Archive format of the 7-Zip tool, usually the smallest of the common formats.
Uses LZMA compression.
RAR vs 7Z
RAR does not support transparency, and 7Z does not.
RAR files use the .rar extension and 7-Zip (7Z) files use .7z, so the converted file gets a new name with the new extension.
Privacy: how it works
- Your RAR files stay on your device. The page reads each file with the browser's file API, converts it with code running in the tab, and hands the result back as a download. No upload happens, so there is no copy of your file on our servers to protect, delete or leak.
- There is nothing to sign up for and no login. The converter does not ask for an email address, and it does not need to know who you are to do its job.
- Some conversions use a WebAssembly engine that your browser downloads once, the first time you need it. Only the engine is fetched, never your file, and the page shows the approximate size before it starts. Your browser caches it, so later conversions skip the download.
- You can check the claim yourself: open your browser developer tools, watch the Network tab while a file converts, and you will see no request that carries your file.
Tips
- Check that the converted archive opens and holds the files you expect before you delete the original.
- File names with unusual characters can differ between formats, so test a copy first.
- Password-protected archives cannot be read until they are unlocked.
- Keep the original archive until you have checked the result.
- This page converts one way only; 7Z files cannot be turned back into RAR here.
Frequently asked questions
Is it really free?
Yes. There is no price, no trial, no credit card and no watermark added to your results. Ulkaa Tool does the conversion with your own device, so there is no server bill to pass on to you.
Are my files uploaded?
No. Your RAR files are read and converted inside your browser and are never sent to Ulkaa or to anyone else. The result is created on your device and you save it from there. Some conversions load a small conversion engine the first time you use them. That download is the only network traffic, it contains no file of yours, and your browser keeps it for next time.
Do I need an account?
No. There is no sign-up and no login. Open the page, add your files and convert. An Ulkaa account is not needed for anything on this tool.
Is there a file size limit?
No limit is set by us. The real limit is your device: the conversion uses your own memory and processor, so very large files can be slow or fail on a weak phone or an older computer. Close other heavy tabs and convert RAR files one at a time if a big batch struggles.
What is the difference between RAR and 7Z?
RAR does not support transparency, and 7Z does not. RAR files use the .rar extension and 7-Zip (7Z) files use .7z, so the converted file gets a new name with the new extension.
Can I convert many RAR files at once?
Yes. Add as many files as your device can handle. Each one is converted on its own and you can download them one by one or as a single ZIP.
Will anything be lost when I convert RAR to 7Z?
The converter keeps the content of the file. Check the result once, since small differences in metadata or colour handling can happen between formats.
Can I convert 7Z back to RAR?
Not on this page. This conversion goes one way. Open the 7Z page to see which formats it can be converted to.
Why does RAR to 7Z download something the first time?
Some pairs use a WebAssembly engine because browsers cannot do the job alone. The engine downloads once, contains none of your files, and is cached afterwards.