MD5 vs SHA-512 — Which Should You Use?

MD5 Hash GeneratorGenerate MD5 checksums (legacy use only).Open tool SHA-512 Hash GeneratorGenerate SHA-512 hashes for high-security applications.Open tool

MD5 and SHA-512 both produce a one-way digest, but they belong to different security eras and operational tiers. MD5 is a 128-bit legacy checksum broken since 2004, kept alive only for compatibility and non-security deduplication. SHA-512 is a 512-bit member of the SHA-2 family, built for collision resistance on 64-bit hardware with a much larger output. If a hash protects anything that could be tampered with, SHA-512 is the safe default.

Use MD5 when

  • You must interoperate with an existing system that hard-codes a 32-char MD5, such as an old dedup key or legacy checksum column.
  • The value is a non-security fingerprint where a collision would be meaningless, not a forgery.
  • Storage is constrained and a 32-char hex string is required by an old spec.
  • You are reading or verifying hashes, not creating a new integrity design.

Use SHA-512 when

  • File integrity, download verification, or signed data must resist tampering or forgery.
  • You are starting a new design with no legacy constraint and want the largest SHA-2 digest.
  • You run on 64-bit hardware where SHA-512 is typically faster than SHA-256.
  • You need future-proofing with 512 bits of digest against advances in cryptanalysis.

Side by side

MD5 Hash GeneratorSHA-512 Hash Generator
Digest size128 bits512 bits
Hex length32 chars128 chars
Base64 length24 chars88 chars
Released19922001
Word width32-bit64-bit
Collision resistanceBroken (practical attacks)Strong
Speed biasFast, but irrelevantFast on 64-bit, still safe
StatusLegacyCurrent best practice
Where it runsBrowser, no uploadBrowser, no upload
under the hood

Neither is for passwords. Both are fast checksums, so attackers can brute-force guesses per second. For credential storage use bcrypt. Neither tool uploads your input; both hash entirely in the browser.

bottom line

Choose SHA-512 for anything that must survive tampering, and reserve MD5 for legacy reads. The 32-char vs 128-char gap is the price of collision resistance, and on modern hardware that price is trivial. If forgery could matter, MD5 is not an option.

Open MD5 Hash Generator Open SHA-512 Hash Generator
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