Base64 tools
Specialised utilities for developers who work with Base64 every day. Everything that can run in your browser does, so your data stays private.
Base64 ValidatorCheck whether a string is valid Base64 online. The validator highlights invalid characters, wrong padding and line-length problems for 8 Base64 standards.Repair Base64Repair broken Base64 online: strips data URI prefixes, whitespace, quotes and escapes, and fixes URL-safe characters, percent-encoding and padding.Base64 NormalizationNormalize Base64 to its canonical form and convert between standards: standard, MIME, PEM, Base64URL, IMAP, XML token/identifier and OpenPGP armor.Base64 Standard DetectorDetect which Base64 standard was used to encode a value: standard, MIME, PEM, Base64URL, IMAP, XML token/identifier or OpenPGP ASCII armor.Character Encoding DetectionDetect 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 ConverterConvert every url(...) image and font in a stylesheet to a Base64 data URI. Paste CSS, upload a file or load a remote stylesheet, with a size limit per file.Data URL to ImageConvert a data URL (data:image/png;base64,...) to an image online. Preview the image, see format and dimensions and download it.Gzip Compression TestCheck online whether a URL is served with gzip, deflate, Brotli or Zstandard compression, and see the compressed and original sizes and savings.HTTP Request OnlineSend HTTP requests online with any method, custom headers and body. See the raw status, response headers and body (text or Base64). Free online HTTP client.Uuencoded File DecoderDecode uuencoded files online. Supports classic uuencode and "begin-base64" blocks, multiple files in one input, automatic preview and download.JWT DecoderDecode JWT tokens online: header, payload and signature, with expiry and issued-at shown as readable dates. Runs locally; the token never leaves your browser.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.