SV

Verktyg

Base64-verktygLector de Base64Validera Base64Reparera trasig Base64JWT-avkodareVerificar Base64Comparar Base64Data-URL till bildDesenvolver Base64 anidadoSocial & SEO toolsRegional toolsHashtag generatorYouTube tagsPIX QRP7M viewerGenerador de código QRIBAN validatorComprimir imagenNormalisera Base64Base64-standarddetektorIdentifiering av teckenkodningCSS data-URI-konverterareKontrollera gzip-komprimeringHTTP-förfrågan onlineUuencoded filavkodareCalculadora de tamaño Base64Contador de tokens de IALimpiador de texto LLMRedactor de secretosURL-koda / avkodaConversor de imágenesUnir PDFFile to bytesPDF tools hubCompress PDFSplit PDFPDF to imageWord counterCase converterRotate PDFWatermark PDFOrganize PDFPDF page numbersSign PDFUnlock PDFUnit converterLorem ipsumJSON tree viewerPDF form fillerGzip comprimir / descomprimirQuitar fondoGenerador de faviconQuitar metadatos EXIFGenerador de hashFormateador JSONProbador de regexExplicador de cronComparador de texto (diff)Calculadora de subredYAML ↔ JSONGenerador de UUIDConversor de timestampGenerador de contraseñasGenerador de Amigo InvisibleCuenta atrás de NavidadSocial meta tagsInstagram hashtagsTikTok hashtagsX / Twitter hashtagsLinkedIn hashtagsFacebook hashtagsPinterest hashtagsThreads hashtagsBluesky hashtagsYouTube Shorts hashtagsCaption counterUTM builderE-invoice viewerXRechnung viewerFactur-X checkerPeppol UBL viewerPT invoice QRChatGPT export viewerICS generatorWhatsApp linkCPF generatorCNPJ generatorNIF generatorINN generatorSNILS generatorVAT calculatorhreflang generatorSchema generatorMedia tools hubByte-omvandlareHex converterCSV ↔ JSONColor converter

Standard Base64 (RFC 4648)

Published

In this guide

This standards reference on Base64Encoding explains main in plain language for developers and everyday users.

Everything important stays private: try the matching converter or tool in your browser — files and tokens are not uploaded.

Read the full English article below for code samples and edge cases, or switch language anytime from the menu. We keep expanding translations from real user feedback.

Try these private tools next

RFC 4648 section 4 defines the “base64” encoding that most programming languages implement by default: btoa(), PHP’s base64_encode(), Python’s b64encode(), Java’s Base64.getEncoder(), and so on.

Rules

  • Alphabet: A–Z a–z 0–9 + / (see Base64 characters).
  • Padding with = so the length is always a multiple of 4.
  • No line breaks. RFC 4648 says implementations must not add line feeds unless a referring specification (like MIME) explicitly requires them.
  • Decoders must reject characters outside the alphabet unless the referring specification says otherwise.
  • Unused bits in the last character should be zero (canonical encoding); strict decoders may reject non-zero bits.

Validation regex

^(?:[A-Za-z0-9+/]{4})*(?:[A-Za-z0-9+/]{2}==|[A-Za-z0-9+/]{3}=)?$

This matches every valid padded value, including the empty string. Check your value interactively with the Base64 validator.

  • Base64URL for URLs and tokens
  • MIME for e-mail with line wrapping

Vanliga frågor

Does this page upload my data?

No. Articles are static. Linked tools run locally in your browser unless a feature explicitly needs a network relay.

Can I request a translation or a new tool?

Yes — use the private feedback form. We prioritize what users ask for across languages.

What is the fastest way to try main?

Open the homepage Base64 converter or the related tools linked on this page and paste a sample.

Relaterade verktyg och guider

Kommentarer (0)

Frågor, idéer eller en bugg i “Standard Base64 (RFC 4648)”? Lämna en kommentar, betygsätt verktyget eller svara andra.

Inga kommentarer ännu. Bli först med att dela din feedback!

Lämna en kommentar

Betygsätt det här verktyget:
Esc
↑ ↓ flytta↵ öppnaEsc stäng