About Reembun

Reembun is a collection of 224 everyday tools (calculators, converters, generators and file utilities) that all share one property: they do their work on your device rather than on ours.

Why this exists

Search for “merge PDF” and you will find dozens of services. Almost every one asks you to upload your document to a server you know nothing about, and offers a privacy policy in exchange. Some delete files after an hour. Some do not say. All of them have, at minimum, held a copy of your contract, your bank statement or your medical record on someone else’s machine.

For a great many tasks that upload is simply unnecessary. Browsers have been able to read files, decode images, render PDFs and perform cryptography locally for years. The work can happen where the file already is.

So that is what these tools do. Not as a feature, but as the whole design: there is no server that receives your data, which means there is no retention policy to trust, no breach that could expose your files, and no limit on file size beyond what your own device can handle.

What we will not do

• No sign-up. Not for the good features, not for batch processing, not for anything.
• No watermarks and no deliberately degraded free tier.
• No daily limits. There is no server cost that scales with your usage, because there is no server doing the work.
• No selling data. We do not have any to sell.

How it is built

The design goal is that a page costs almost nothing to read. The text, the tables and the explanations are part of the page itself, so they appear the moment it opens. The tool wakes up separately, only once you start using it, and whatever a file tool needs to do its heavier work arrives at the moment you hand it a file rather than before. That is why these pages open quickly on a phone on a poor connection.

Where your browser already does a job well, we let it do that job. Nothing here reinvents work that has already been done more carefully elsewhere, and that goes double for anything touching security.

Honest limitations

Doing the work on your own device has downsides. Here they are:

• Very big files can fail. Your browser only gets so much memory to play with, and phones get the least.
• Some files will not open. iPhone HEIC photos and camera RAW files need software a browser does not have.
• JavaScript has to be turned on. It is what runs the tool. The written guides and tables still work without it.
• A few jobs really do need a server. When that is the case, we say so instead of building a weaker version.

Who builds it

Reembun is built and operated by PT RHP Cipta Digital. If a tool gives you a wrong answer, or you need one that is not here, we would genuinely like to hear about it. Write to [email protected] or use the contact page.