File, Device & Developer Tools
Handy utilities for checking, packing and transforming files: verify downloads with checksums, find out what a file really is, create and extract ZIP archives, encode Base64, scan and make QR codes and barcodes, and convert data formats. The device tests check your microphone, webcam, keyboard, mouse and screen in seconds.
Free to use · No account needed · Files are processed on your device and never uploaded
About the File, Device & Developer Tools
Utilities for checking and transforming files: verify downloads with MD5 or SHA-256 checksums, find out what an unknown file really is, create or extract ZIP archives, encode Base64, make QR codes and convert between CSV and JSON.
They're handy for developers, but just as useful for anyone who's downloaded a file and wants to be sure it's genuine before opening it.
Common questions
How do I check that a download is safe?
Compare its SHA-256 checksum with the one on the publisher's website, and check its real type with the file type checker. An installer disguised as a PDF or photo is a warning sign.
Do QR codes made here expire?
No. They're static codes with the content stored in the pattern itself.
Can I unzip on iPhone or Chromebook?
Yes. The unzip tool works in any modern browser.