With out uploading make md5 hash upto 4gb files (click here) .

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Please note that the advantage of doing an incremental md5 is to keep memory usage low.

Keep an eye on the memory usage of your browser. If you got chrome, open about:memory to see all the browsers memory usage (you must refresh continuously).
With normal md5, you should observe slightly faster times but high memory usage (because the entire file need to be read into an array).
With incremental md5, you should observe stable memory usage but slightly higher times.
Be aware that while using normal md5, the browser can crash due to high memory usage.

Credits/Source: js-spark-md5

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The MD5 algorithm is a widely used hash function producing a 128-bit hash value. Although MD5 was initially designed to be used as a cryptographic hash function, it has been found to suffer from extensive vulnerabilities. It can still be used as a checksum to verify data integrity, but only against unintentional corruption.

Like most hash functions, MD5 is neither encryption nor encoding. It can be reversed by brute-force attack and suffers from extensive vulnerabilities as detailed in the security section below.

MD5 was designed by Ronald Rivest in 1991 to replace an earlier hash function MD4. The source code in RFC 1321 contains a "by attribution" RSA license.

The security of the MD5 has been severely compromised, with its weaknesses having been exploited in the field, most infamously by the Flame malware in 2012. The CMU Software Engineering Institute considers MD5 essentially "cryptographically broken and unsuitable for further use".

Source: Wikipedia