Base64 工具
为每天与 Base64 打交道的开发者打造的专业工具。凡是能在浏览器中运行的功能都在本地运行，确保您的数据隐私。
Base64 校验器在线检查字符串是否为有效的 Base64。校验器会针对 8 种 Base64 标准高亮显示无效字符、错误填充和行长度问题。Base64 修复在线修复损坏的 Base64：去除 Data URI 前缀、空白、引号和转义，并修正 URL 安全字符、百分号编码和填充。Base64 标准化将 Base64 标准化为规范形式，并在各标准之间转换：标准、MIME、PEM、Base64URL、IMAP、XML 令牌/标识符以及 OpenPGP 封装。Base64 标准检测器检测某个值使用了哪种 Base64 标准：标准、MIME、PEM、Base64URL、IMAP、XML 令牌/标识符或 OpenPGP ASCII 封装。字符编码检测Detect the character encoding of Base64 text: UTF-8, Windows-1252, ISO-8859-1/2/15, Cyrillic, Shift_JIS, GBK and more. Fix European mojibake like é online.CSS Data URI 转换器将样式表中所有 url(...) 引用的图片和字体转换为 Base64 Data URI。可粘贴 CSS、上传文件或加载远程样式表，并可设置单个文件大小上限。Data URL 转图片在线将 Data URL（data:image/png;base64,...）转换为图片。预览图片，查看格式和尺寸并下载。Gzip 压缩测试在线检查 URL 是否启用了 gzip、deflate、Brotli 或 Zstandard 压缩，并查看压缩前后的大小及节省比例。在线 HTTP 请求在线发送 HTTP 请求，支持任意方法、自定义请求头和请求体。查看原始状态、响应头和响应体（文本或 Base64）。免费在线 HTTP 客户端。Uuencode 文件解码器在线解码 uuencode 文件。支持经典 uuencode 和“begin-base64”块，单次输入可包含多个文件，自动预览并下载。JWT 解码器在线解码 JWT 令牌：头部、载荷和签名，过期时间和签发时间以易读日期显示。本地运行，令牌不会离开您的浏览器。Base64 Size CalculatorCalculate Base64 size online: convert bytes to Base64 characters (and back), including MIME/PEM wrapping overhead. Free size estimator for developers.Compare Base64 StringsCompare two Base64 strings online. See if they decode to the same bytes after normalizing whitespace, padding and URL-safe alphabets. Free Base64 diff.Verify Base64 (Catch LLM Errors)Verify Base64 online: catch ChatGPT/Claude hallucinations with round-trip checks. Confirm plaintext matches and canonical form. Free, private, in-browser.Unwrap Nested Base64Unwrap nested Base64 online: decode until the result is no longer Base64. Catch double-encoded APIs, LLM chains and mistaken re-encodes. Free and private.URL Encode and DecodeURL encode and decode online (percent-encoding). Fix + vs %20, decode query strings, prepare Base64 for URLs or use Base64URL. Free, private, for developers.Compress Image OnlineCompress images in your browser: resize, WebP/JPEG, see % saved. Download or copy Base64. Free, private—ideal when mobile data is expensive (Brazil, LATAM).HEIC / WebP / SVG Image ConverterConvert HEIC to JPG, WebP to PNG, SVG to PNG in your browser. Batch image converter—no upload, private. Free for iPhone photos and WebP downloads.Merge PDF & Images to PDFMerge PDF files or turn images into a PDF in your browser. Free, no signup, no watermark—contracts stay on your device. Also JPG/PNG/HEIC to PDF.Gzip Compress & DecompressGzip compress and decompress in your browser. Shrink text, JSON or Base64 before transfer, or expand .gz. Free, private, no upload—saves costly mobile data.Remove Image BackgroundRemove solid backgrounds in your browser with edge flood-fill and soft feathering. Click to pick color, download transparent PNG. Private—no upload.Favicon GeneratorGenerate favicon PNG sizes (16–512) from a logo in your browser. Get HTML tags, webmanifest, download or Base64. Free and private—no upload.Base64 Reader & Viewer OnlineFree Base64 viewer & reader: paste to preview images, PDF or text, enlarge fullscreen, zoom and download. Live, private, no upload—data URI friendly.Remove EXIF & GPS from PhotosStrip EXIF and GPS from photos in your browser. Re-encode JPG/PNG/WebP locally—no upload. Privacy-first for EU GDPR and US sharing.Hash Generator (MD5, SHA-256)Generate MD5, SHA-1, SHA-256 and SHA-512 hashes for text or files in your browser. Free checksum tool—no upload, private.JSON Formatter & ValidatorBeautify, minify and validate JSON in your browser. Ad-free JSON formatter for developers—private, no upload of API payloads.Regex Tester OnlineTest regular expressions online with live highlighting and capture groups. Private regex tester—no upload of logs or PII. Free for developers.Cron Expression ExplainerExplain cron expressions in plain English and show the next run times. Free cron parser for DevOps & IT—runs in your browser, no upload.Diff Checker — Compare Text OnlineCompare two texts or code snippets online with a private line diff. Free diff checker for configs and API responses—no upload.CIDR Subnet CalculatorIPv4 CIDR subnet calculator: network, broadcast, netmask, usable hosts and IP membership. Free for IT & cloud VPC planning—private, no upload.YAML to JSON & JSON to YAMLConvert YAML to JSON and JSON to YAML in your browser. Free private converter for Kubernetes, GitHub Actions and Ansible—no upload.UUID GeneratorGenerate UUID v4 / GUIDs online with crypto.randomUUID. Bulk copy for tests and databases. Free, private, no signup.Unix Timestamp ConverterConvert Unix epoch timestamps to dates (UTC & local) and back. Seconds or milliseconds. Free epoch converter for developers.Password GeneratorGenerate strong random passwords in your browser with crypto.getRandomValues. No upload, no account—privacy-first password generator.Secret Santa & Amigo Secreto GeneratorFree Secret Santa / Amigo Secreto generator: draw names with exclusions, private Base64 links, no signup. Pass-the-phone reveal—names never uploaded.Christmas Countdown — Days Until ChristmasLive Christmas countdown: how many days until Christmas in your timezone. Free, no app—then draw Secret Santa / Amigo Secreto privately in your browser.QR Code GeneratorCreate QR codes from URLs or text in your browser. Download PNG or copy a data URI. Free QR generator—no account, no tracked short links.