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Encoding & decoding
Base64 decoder
Decode Base64 text or files online.
Base64 encoder
Encode text or files to Base64 online.
URL encoder
Percent-encode text, query values, or complete URIs with the correct browser standard.
URL decoder
Decode percent-encoded URLs and query values, with an optional bounded multi-pass mode.
Hash generator
Calculate SHA-256, SHA-512, SHA-1, and MD5 checksums for text or files locally.
JWT decoder
Decode a JWT header, payload, signature bytes, and timestamp claims without uploading the token.
QR code generator
Create a standards-compatible static QR code for text or a URL and download it as PNG or SVG.
QR code scanner
Read a QR code from an image or camera locally without automatically opening decoded links.
Text
AI watermark & hidden character remover
Find and remove literal hidden Unicode artifacts often copied from GPT, Claude, PDFs, or web pages. This tool does not detect AI authorship.
Word & character counter
Count words, characters, lines, and paragraphs online.
Text compare
Compare two texts line by line and highlight their differences.
Case converter
Convert text to uppercase, lowercase, sentence case, or capitalized words.
Converters
CSV → Markdown
Turn CSV rows into a clean Markdown table with delimiter detection and escaped cells.
Markdown → CSV
Convert a Markdown table into standards-friendly CSV for spreadsheets and data tools.
JSON → CSV
Convert an array of JSON objects into CSV with a stable union of object keys.
CSV → JSON
Convert CSV into an array of JSON objects using the first row as field names.
HTML → Markdown
Convert HTML structure into readable Markdown, including headings, links, lists, code, and tables.
Markdown → HTML
Render Markdown as HTML with common GFM tables, lists, links, and fenced code blocks.
Data
JSON formatter
Make JSON easier to read, check it for errors, or minify it to one line.
HTML formatter
Format HTML source locally with predictable indentation and line wrapping.
CSS formatter
Format plain CSS source locally without loading referenced URLs or applying styles.
JavaScript formatter
Format or minify JavaScript source locally without executing it.
SQL formatter
Format SQL locally for an explicitly selected database dialect.
IPv4 subnet calculator
Calculate an IPv4 network range, netmask, wildcard mask, usable-address bounds, and special-use classification locally.