Tool comparison
Hash Generator vs URL Encoder / Decoder
Hash Generator (cryptography) and URL Encoder / Decoder (encoding) come from different categories but appear together in developer workflows. This guide explains what each does and when to reach for one over the other.
Bottom line
Hash Generator creates a one-way digest; URL Encoder makes text safe for URLs via percent-encoding. Hash digests are already URL-safe hex strings, so they rarely need URL encoding — use each for its own domain.
What each tool does
Hash Generator
A cryptographic hash function takes an input of any length and produces a fixed-size output — the hash or digest — that uniquely represents the input. The same input always produces the same hash; changing even a single character produces a completely different hash. Hash functions are one-way: you cannot reverse a hash to recover the original input. MD5 and SHA-1 are older algorithms still used for non-security checksums. SHA-256 and SHA-512 are current standards for security-sensitive use cases such as digital signatures, API authentication, and password storage (always combined with a proper key-derivation function like bcrypt or Argon2 for passwords).
Open Hash Generator →URL Encoder / Decoder
Percent-encoding (also called URL encoding) is a mechanism defined in RFC 3986 for representing characters that are not allowed or have special meaning in a URL. Every character that needs encoding is replaced by a percent sign followed by two hex digits representing the character's UTF-8 byte value — for example, a space becomes %20 and an ampersand becomes %26. There are two encoding variants: component encoding (encodeURIComponent) converts every character except the unreserved set A–Z a–z 0–9 and - _ . ! ~ * ' ( ); full URL encoding (encodeURI) additionally preserves the structural characters : / ? # [ ] @ ! $ & ' ( ) * + , ; = so that a complete URL remains navigable. Decoding reverses the process, converting all %XX sequences back to the original characters. URL encoding is required whenever you embed user-supplied text in a query string, form a redirect URL, construct a OAuth callback, or pass data through a system that only allows safe ASCII characters.
Open URL Encoder / Decoder →Side-by-side comparison
| Feature | Hash Generator | URL Encoder / Decoder |
|---|---|---|
| Category | cryptography | encoding |
| Primary purpose | Generate MD5, SHA-1, SHA-256, SHA-384, or SHA-512 hashes from any text input. | Encode or decode URLs and query string components using percent-encoding (RFC 3986). |
| Inputs | input, algorithm, encoding | input, mode |
| Outputs | hash, algorithm, encoding, input_byte_length, digest_length | output, mode, changed, encoding_table |
When to use each
Use Hash Generator when…
How to verify a SHA-256 checksum online
Confirm that a downloaded string or file content matches a known SHA-256 hash.
How to generate an MD5 hash online
Quickly compute an MD5 digest of a string for a legacy API or non-security checksum.
Use URL Encoder / Decoder when…
How to encode a URL query parameter value
Safely embed user input or special characters in a URL query string.
How to decode a percent-encoded URL
Convert %XX sequences back to human-readable text for debugging or display.
Frequently asked questions
- Is my input sent to a server?
- No. Hashing runs entirely in your browser using the Web Crypto API. Your text never leaves your device. The REST API endpoint processes input server-side in an isolated, stateless function with no logging.
- Which algorithm should I use?
- Use SHA-256 for new projects — it is the current standard for digital signatures, API authentication, and data integrity. Use MD5 or SHA-1 only when a legacy system requires it; both are broken for collision resistance but still acceptable for non-security checksums like file integrity verification. Use SHA-512 when you need a 512-bit digest or when a framework specifically requires it.
- What is the difference between encodeURI and encodeURIComponent?
- encodeURI is designed for complete URLs — it leaves the structural characters (: / ? # & = + @) untouched so the URL remains valid. encodeURIComponent is designed for individual values within a URL — it encodes those structural characters too, preventing them from being misinterpreted as URL delimiters. Use encodeURIComponent for query parameter values; use encodeURI only if you have a full URL that you want to sanitise without breaking its structure.
- Why does a space sometimes appear as + instead of %20?
- HTML forms using application/x-www-form-urlencoded encoding replace spaces with + rather than %20. Both are valid in query strings, but they are different encodings. Modern APIs and URLs use %20 (RFC 3986). If you are constructing a query string for a form submission, check whether the receiving server expects + or %20.