Base64 工具
為每天使用 Base64 的開發者打造的專用工具。凡是能在瀏覽器中執行的都在瀏覽器中執行，確保您的資料隱私。
Base64 驗證器線上檢查字串是否為有效的 Base64。驗證器會標示 8 種 Base64 標準中的無效字元、錯誤補齊與行長問題。修復 Base64線上修復損壞的 Base64：移除 Data URI 前綴、空白、引號和跳脫字元，並修正 URL 安全字元、百分比編碼與補齊。Base64 標準轉換將 Base64 標準化為規範格式，並在各標準間轉換：標準、MIME、PEM、Base64URL、IMAP、XML 權杖/識別碼及 OpenPGP armor。Base64 標準偵測器偵測某個值使用了哪種 Base64 標準：標準、MIME、PEM、Base64URL、IMAP、XML 權杖/識別碼或 OpenPGP ASCII armor。字元編碼偵測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 轉換器將樣式表中所有 url(...) 圖片和字型轉為 Base64 Data URI。可貼上 CSS、上傳檔案或載入遠端樣式表，並可設定單檔大小上限。Data URL 轉圖片線上將 Data URL（data:image/png;base64,...）轉為圖片。預覽圖片、查看格式與尺寸並下載。Gzip 壓縮測試線上檢查網址是否以 gzip、deflate、Brotli 或 Zstandard 壓縮傳送，並查看壓縮前後的大小與節省比例。線上 HTTP 請求線上發送 HTTP 請求，支援任何方法、自訂標頭與內容。查看原始狀態、回應標頭和內容（文字或 Base64）。免費線上 HTTP 用戶端。Uuencode 檔案解碼器線上解碼 uuencode 檔案。支援傳統 uuencode 及「begin-base64」區塊、單次輸入多個檔案，並可自動預覽與下載。JWT 解碼器線上解碼 JWT 權杖：header、payload 與 signature，並將到期時間和簽發時間顯示為易讀日期。在本機執行，權杖絕不離開您的瀏覽器。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.