Hash & Encoder Tools
Compute MD5, SHA-1, SHA-256, SHA-384, SHA-512 hashes. Encode/decode Base64, URL, HTML entities, Hex, Binary. UTF-8 safe. Drop a file to hash it directly. No upload, no signup.
Input
Output
A developer's Swiss-army knife for hashing & encoding
Every day, developers need to compute a hash, encode a Base64 string, URL-encode a value, or unescape HTML entities. The usual workflow involves jumping between several scattered sites (each plastered with ads). This page brings the most common 15 operations into a single, consistent interface.
Hashes (MD5, SHA-Familie)
We compute MD5, SHA-1, SHA-256, SHA-384 and SHA-512. SHA hashes use the browser's native Web Crypto API — fast and standardized. MD5 is shipped as a small in-house implementation since Web Crypto deliberately omits it (cryptographically broken since 2005, but still useful for file checksums and content addressing).
File hashing: drop any file into the input box, or click "Drop or pick a
file". We read it as raw bytes and hash directly — the result will match exactly what
md5sum, sha256sum and the corresponding macOS / Windows tools
produce.
Base64 (UTF-8-sicher)
JavaScript's built-in btoa() throws on any Unicode character above U+00FF —
which means it fails on accents, emojis, kanji, anything outside Latin-1. Our encoder
round-trips through a UTF-8 byte buffer, so it handles any Unicode correctly.
Decoding also tolerates whitespace and the URL-safe variant (- instead of
+, _ instead of /).
URL-Kodierung
Uses encodeURIComponent, which is the right choice for embedding values in URL
path segments or query parameters. Spaces become %20, ampersands become
%26, etc.
HTML-Entitäten
Escape converts the 5 dangerous characters (&,
<, >, ", ') to their entity form
— handy for sanitizing user input before inserting into HTML. Unescape
handles named entities (©, — …), numeric
(A) and hexadecimal (👋), including non-BMP
Unicode like emojis.
Hex & Binary
Converts text to a hexadecimal or binary representation of its UTF-8 bytes, and back. The
decoders are forgiving — they accept spaces, line breaks and 0x prefixes for
hex.
Datenschutz
Nothing is ever uploaded. Hashes, encodings and file reading all happen locally. We don't store anything, we don't log anything, we don't analyze anything — there isn't even a server component that could.
Häufige Anwendungsfälle
- Verify a download matches its published
sha256checksum. - Decode a Base64 string from a JWT, email header or config file.
- URL-encode a query value to test a problematic redirect.
- Strip HTML entities from text scraped from a webpage.
- Generate a deterministic content hash for caching or deduplication.
Häufig gestellte Fragen
- Welche Hash-Algorithmen unterstützt dieses Tool?
- MD5, SHA-1, SHA-256, SHA-384 und SHA-512. SHA-Hashes verwenden die native Web Crypto API des Browsers für Geschwindigkeit und Sicherheit. MD5 wird über eine clientseitige Implementierung bereitgestellt.
- Ist es sicher, sensible Daten online zu hashen?
- Ja. Dieses Tool läuft vollständig in Ihrem Browser — Ihre Daten werden niemals an einen Server gesendet. Es gibt keine Backend-Komponente, die Ihre Eingaben speichern oder abfangen könnte.
- Welche Kodierungsformate sind verfügbar?
- Base64-Kodierung/-Dekodierung (UTF-8-sicher), URL-Kodierung/-Dekodierung, HTML-Entity-Escape/Unescape, Hex-Kodierung/-Dekodierung und Binär-Kodierung/-Dekodierung.
- Kann ich einen Hash zurück in den Originaltext dekodieren?
- Nein. Kryptografische Hashes sind Einwegfunktionen und können nicht umgekehrt werden. Sie können jedoch Base64, URL-Kodierung, HTML-Entities, Hex und Binär zurück in den Originaltext dekodieren.
- Ist dieses Tool kostenlos nutzbar?
- Ja, völlig kostenlos ohne Nutzungsbeschränkungen, ohne Anmeldung und ohne Wasserzeichen.