Base64 Tools & Converters

ImageImage to Base64Drop an image, get a Base64 data URI for HTML/CSS. ImageBase64 to ImageDecode Base64 or a data URI into a downloadable image. FileFile to Base64Encode any file to a raw Base64 string or data URI. FileBase64 to FileDecode Base64 and download it — file type auto-detected. PNGPNG to Base64Convert a PNG to a Base64 data URI. PNGBase64 to PNGDecode Base64 into a downloadable PNG. JPGJPG to Base64Convert a JPG/JPEG to a Base64 data URI. SVGSVG to Base64Convert an SVG to a Base64 data URI for CSS. PDFPDF to Base64Encode a PDF to a Base64 string or data URI. PDFBase64 to PDFDecode Base64 into a previewable, downloadable PDF. AudioMP3 / Audio to Base64Encode MP3, WAV, or OGG audio to Base64. HexBase64 to HexConvert Base64 to the hex of its bytes. HexHex to Base64Convert a hex string to standard or URL-safe Base64. JSONBase64 to JSONDecode Base64 and pretty-print it as JSON (incl. JWT payloads). CSVBase64 to CSVDecode Base64 to CSV text with a live table preview. SVGBase64 to SVGDecode Base64 to SVG source with a live preview. BlobBase64 to BlobConvert Base64 to a Blob and download it — with the JS code. Data URIData URI GeneratorTurn text or a file into a data: URI for HTML/CSS. QRBase64 to QR CodeGenerate a scannable QR code from text or Base64. ExcelBase64 to ExcelDecode Base64 to an .xlsx file, or encode a spreadsheet.

JWTJWT DecoderDecode a JSON Web Token's header and payload (no verification). AuthBasic Auth Header GeneratorBuild an Authorization: Basic header from a username and password. HexHex DecoderDecode a hex string to text, or encode text to hex. UTF-8UTF-8 DecoderDecode UTF-8 bytes (hex or percent-encoded) to readable text. HTMLHTML Entity DecoderDecode or encode HTML entities like & and '. URLURL DecodePercent-decode a URL-encoded string. URLURL EncodePercent-encode text for URLs and query parameters. KubernetesKubernetes Secret DecoderPaste a Secret YAML and decode every base64 value. GzipBase64 Gzip DecodeDecode Base64 and gunzip it in one step. CertBase64 Certificate DecoderDecode, re-wrap, and convert PEM / DER certificates. SAMLSAML DecoderDecode a SAMLResponse/Request — base64, DEFLATE, pretty XML. PowerShellPowerShell -enc DecoderDecode a PowerShell EncodedCommand (UTF-16LE base64). Dockerdockerconfigjson GeneratorBuild/decode a Kubernetes image-pull secret. GraphQLGraphQL Cursor DecoderDecode Relay pagination cursors (arrayconnection:N). MagicMagic DecoderAuto-detect & peel Base64 / hex / URL / gzip layers.

SheetsBase64 in Google SheetsApps Script BASE64ENCODE/DECODE custom functions. FlutterFlutter Base64 Decode ErrorFix FormatException / "Invalid character" in Dart. React NativeRN atob / btoa PolyfillFix "atob is not defined" in React Native. AndroidAndroid Base64 NO_WRAPFix newlines in Base64.encodeToString. ZPLImage to ZPL (^GFA)Convert an image to a Zebra-printer ^GFA graphic command.

AI VisionImage to Base64 for AI VisionImage → Base64 + ready payloads for GPT-4o, Claude, Gemini. ClaudeClaude API Base64 ImageThe exact Messages API image block (raw base64, media_type). GeminiGemini API Base64 ImageThe exact inline_data part for generateContent. FixFix "Invalid Image" Base64 ErrorsValidate a base64 image against every vision-API rule. ResizeBase64 Image Too Large?Resize + re-encode to fit GPT-4o/Claude/Gemini limits.

CalculatorBase64 Size CalculatorBytes ↔ Base64 length and the exact ~33% overhead, formula explained. URL-safeBase64URL Encode & DecodeURL-safe Base64 (RFC 4648 §5) for JWTs, URLs, and filenames.

PythonBase64 in Pythonbase64.b64encode / b64decode, URL-safe, files — with a live tool. JavaScriptBase64 in JavaScriptbtoa / atob with the TextEncoder Unicode-safe pattern. TypeScriptBase64 in TypeScriptType-safe wrappers, browser vs Node Buffer. Node.jsBase64 in Node.jsBuffer.from(...).toString('base64') and 'base64url'. JavaBase64 in Javajava.util.Base64 getEncoder / getUrlEncoder. GoBase64 in Goencoding/base64 StdEncoding / URLEncoding / RawURLEncoding. RustBase64 in RustThe base64 crate Engine API (general_purpose::STANDARD). PHPBase64 in PHPbase64_encode / base64_decode and the URL-safe variant. C#Base64 in C#Convert.ToBase64String / FromBase64String with Encoding.UTF8. RubyBase64 in Rubystrict_encode64 vs encode64, urlsafe_encode64. SwiftBase64 in SwiftData.base64EncodedString() / Data(base64Encoded:). KotlinBase64 in Kotlinkotlin.io.encoding.Base64, java.util / android.util.Base64. CBase64 in CPortable lookup-table encoder/decoder + OpenSSL EVP. C++Base64 in C++Self-contained std::string encoder + OpenSSL EVP. BashBase64 in BashThe base64 command, echo -n gotcha, -w 0 wrapping. PowerShellBase64 in PowerShell[Convert]::ToBase64String and the UTF-16 vs UTF-8 trap. DartBase64 in Dart & Flutterdart:convert base64Encode / base64Decode / base64Url. PerlBase64 in PerlMIME::Base64 encode_base64 / decode_base64, one-liners.