Crypto / Security

Hashes, AES, JWT decode, passwords, and UUIDs.

Hash Generator

MD5, SHA-1, SHA-256, and SHA-512 digests.

Free online hash generator for MD5, SHA-1, SHA-256, and SHA-512. Hash passwords, checksums, and strings locally. Prefer SHA-256+ for security-sensitive work.

What you can do

MD5, SHA-1, SHA-256, and SHA-512 digests
Copy any hash with one click
All hashing runs in the browser
No upload of secret material

Category: Crypto / Security

hash
md5
sha1
sha256
sha512
digest

DevKit runs in your browser. No login, no paywall, and nothing is uploaded to a server.

MD5, SHA-1, SHA-256, and SHA-512 digests.

Crypto / Security

AES Encrypt / Decrypt

Encrypt and decrypt text with a passphrase (AES).

Free online AES encrypt and decrypt tool using CryptoJS (OpenSSL-compatible). Protect text with a passphrase entirely in your browser. Use strong passphrases; this is a convenience utility, not a full key-management system.

What you can do

AES encrypt and decrypt with a passphrase
OpenSSL-compatible CryptoJS format
Swap ciphertext and plaintext
Local-only cryptography

Category: Crypto / Security

aes
encrypt
decrypt
cipher
crypto

DevKit runs in your browser. No login, no paywall, and nothing is uploaded to a server.

Encrypt and decrypt text with a passphrase (AES).

Crypto / Security

JWT Decoder

Decode JWT header and payload. Does not verify signatures.

Free online JWT decoder. Inspect JSON Web Token headers and payloads without verifying signatures — perfect for debugging auth tokens locally. Decoding happens in your browser; tokens are not sent to a server.

What you can do

Decode JWT header and payload
Pretty-printed JSON output
Does not verify signatures (debug only)
Private client-side decoding

Category: Crypto / Security

jwt
token
decode
auth

DevKit runs in your browser. No login, no paywall, and nothing is uploaded to a server.

Decode JWT header and payload. Does not verify signatures.

Crypto / Security

Password Generator

Generate strong random passwords and secrets.

Password Generator is a free online developer tool in DevKit’s Crypto / Security collection. Generate strong random passwords and secrets. It runs entirely in your browser — no login and no uploads — so your input stays private. Search keywords: password, secret, random, generate.

What you can do

Generate strong random passwords and secrets
Runs locally in your browser
Related terms: password, secret, random, generate

Category: Crypto / Security

password
secret
random
generate

DevKit runs in your browser. No login, no paywall, and nothing is uploaded to a server.

Generate strong random passwords and secrets.

Crypto / Security

UUID Generator

Generate UUID v4 identifiers.

UUID Generator is a free online developer tool in DevKit’s Crypto / Security collection. Generate UUID v4 identifiers. It runs entirely in your browser — no login and no uploads — so your input stays private. Search keywords: uuid, guid, v4, id.

What you can do

Generate UUID v4 identifiers
Runs locally in your browser
Related terms: uuid, guid, v4, id

Category: Crypto / Security

uuid
guid
v4
id

DevKit runs in your browser. No login, no paywall, and nothing is uploaded to a server.

Generate UUID v4 identifiers.

Crypto / Security

Nano ID Generator

Generate compact unique IDs.

Nano ID Generator is a free online developer tool in DevKit’s Crypto / Security collection. Generate compact unique IDs. It runs entirely in your browser — no login and no uploads — so your input stays private. Search keywords: nanoid, id, unique, random.

What you can do

Generate compact unique IDs
Runs locally in your browser
Related terms: nanoid, id, unique, random

Category: Crypto / Security

nanoid
id
unique
random

DevKit runs in your browser. No login, no paywall, and nothing is uploaded to a server.

Generate compact unique IDs.

Crypto / Security

HMAC Generator

Create HMAC digests with a secret key.

HMAC Generator is a free online developer tool in DevKit’s Crypto / Security collection. Create HMAC digests with a secret key. It runs entirely in your browser — no login and no uploads — so your input stays private. Search keywords: hmac, sha256, signature, mac.

What you can do

Create HMAC digests with a secret key
Runs locally in your browser
Related terms: hmac, sha256, signature, mac

Category: Crypto / Security

hmac
sha256
signature
mac

DevKit runs in your browser. No login, no paywall, and nothing is uploaded to a server.

Create HMAC digests with a secret key.

Crypto / Security

Random Byte Generator

Generate cryptographically secure random bytes.

Random Byte Generator is a free online developer tool in DevKit’s Crypto / Security collection. Generate cryptographically secure random bytes. It runs entirely in your browser — no login and no uploads — so your input stays private. Search keywords: random, bytes, secret, hex.

What you can do

Generate cryptographically secure random bytes
Runs locally in your browser
Related terms: random, bytes, secret, hex

Category: Crypto / Security

random
bytes
secret
hex

DevKit runs in your browser. No login, no paywall, and nothing is uploaded to a server.

Generate cryptographically secure random bytes.

Crypto / Security

Password Strength Meter

Estimate password strength with transparent heuristics.

Password Strength Meter is a free online developer tool in DevKit’s Crypto / Security collection. Estimate password strength with transparent heuristics. It runs entirely in your browser — no login and no uploads — so your input stays private. Search keywords: password, strength, entropy.

What you can do

Estimate password strength with transparent heuristics
Runs locally in your browser
Related terms: password, strength, entropy

Category: Crypto / Security

password
strength
entropy

DevKit runs in your browser. No login, no paywall, and nothing is uploaded to a server.

Estimate password strength with transparent heuristics.

Crypto / Security

Secret Redactor

Mask common credentials and tokens in logs.

Secret Redactor is a free online developer tool in DevKit’s Crypto / Security collection. Mask common credentials and tokens in logs. It runs entirely in your browser — no login and no uploads — so your input stays private. Search keywords: secret, redact, token, log.

What you can do

Mask common credentials and tokens in logs
Runs locally in your browser
Related terms: secret, redact, token, log

Category: Crypto / Security

secret
redact
token
log

DevKit runs in your browser. No login, no paywall, and nothing is uploaded to a server.

Mask common credentials and tokens in logs.

Crypto / Security

CSP Builder

Build a Content Security Policy from common directives.

CSP Builder is a free online developer tool in DevKit’s Crypto / Security collection. Build a Content Security Policy from common directives. It runs entirely in your browser — no login and no uploads — so your input stays private. Search keywords: csp, security, header, content-security-policy.

What you can do

Build a Content Security Policy from common directives
Runs locally in your browser
Related terms: csp, security, header, content-security-policy

Category: Crypto / Security

csp
security
header
content-security-policy

DevKit runs in your browser. No login, no paywall, and nothing is uploaded to a server.

Build a Content Security Policy from common directives.

Crypto / Security

SRI Hash Generator

Generate SHA integrity attributes from pasted content.

SRI Hash Generator is a free online developer tool in DevKit’s Crypto / Security collection. Generate SHA integrity attributes from pasted content. It runs entirely in your browser — no login and no uploads — so your input stays private. Search keywords: sri, integrity, sha384, hash.

What you can do

Generate SHA integrity attributes from pasted content
Runs locally in your browser
Related terms: sri, integrity, sha384, hash

Category: Crypto / Security

sri
integrity
sha384
hash

DevKit runs in your browser. No login, no paywall, and nothing is uploaded to a server.

Generate SHA integrity attributes from pasted content.

Crypto / Security

AES-GCM Encrypt / Decrypt

Use Web Crypto authenticated encryption locally.

AES-GCM Encrypt / Decrypt is a free online developer tool in DevKit’s Crypto / Security collection. Use Web Crypto authenticated encryption locally. It runs entirely in your browser — no login and no uploads — so your input stays private. Search keywords: aes, gcm, encrypt, decrypt.

What you can do

Use Web Crypto authenticated encryption locally
Runs locally in your browser
Related terms: aes, gcm, encrypt, decrypt

Category: Crypto / Security

aes
gcm
encrypt
decrypt

DevKit runs in your browser. No login, no paywall, and nothing is uploaded to a server.

Use Web Crypto authenticated encryption locally.

Crypto / Security

JWT HS256 Verifier

Verify an HS256 token with a supplied secret.

JWT HS256 Verifier is a free online developer tool in DevKit’s Crypto / Security collection. Verify an HS256 token with a supplied secret. It runs entirely in your browser — no login and no uploads — so your input stays private. Search keywords: jwt, hs256, verify, signature.

What you can do

Verify an HS256 token with a supplied secret
Runs locally in your browser
Related terms: jwt, hs256, verify, signature

Category: Crypto / Security

jwt
hs256
verify
signature

DevKit runs in your browser. No login, no paywall, and nothing is uploaded to a server.

Verify an HS256 token with a supplied secret.

Crypto / Security

UUID / ULID Generator

Generate UUID v1-like, v4, v5, and ULID identifiers.

UUID / ULID Generator is a free online developer tool in DevKit’s Crypto / Security collection. Generate UUID v1-like, v4, v5, and ULID identifiers. It runs entirely in your browser — no login and no uploads — so your input stays private. Search keywords: uuid, ulid, identifier, v5.

What you can do

Generate UUID v1-like, v4, v5, and ULID identifiers
Runs locally in your browser
Related terms: uuid, ulid, identifier, v5

Category: Crypto / Security

uuid
ulid
identifier
v5

DevKit runs in your browser. No login, no paywall, and nothing is uploaded to a server.

Generate UUID v1-like, v4, v5, and ULID identifiers.

Crypto / Security

File Hash Calculator

Calculate SHA-256, SHA-384, and SHA-512 for a local file.

File Hash Calculator is a free online developer tool in DevKit’s Crypto / Security collection. Calculate SHA-256, SHA-384, and SHA-512 for a local file. It runs entirely in your browser — no login and no uploads — so your input stays private. Search keywords: file, hash, sha256, checksum.

What you can do

Calculate SHA-256, SHA-384, and SHA-512 for a local file
Runs locally in your browser
Related terms: file, hash, sha256, checksum

Category: Crypto / Security

file
hash
sha256
checksum

DevKit runs in your browser. No login, no paywall, and nothing is uploaded to a server.

Calculate SHA-256, SHA-384, and SHA-512 for a local file.

Crypto / Security