For Developers
Practical file tools for documentation, data, and verification.
View all toolsStart with the right tool
Markdown to HTML
Convert Markdown files into a formatted HTML page.
Open tool DocumentsHTML to PDF
Convert HTML pages into a PDF document.
Open tool ExcelCSV to Excel
Convert CSV files into Excel (XLSX) spreadsheets.
Open tool UtilitiesFile Hash Generator
Compute SHA-256 and MD5 hashes of any file to verify its integrity.
Open tool UtilitiesFile Info Analyzer
View a file's size, type, and details as a JSON report.
Open tool UtilitiesJSON Minify
Validate JSON and minify it.
Open tool UtilitiesText Diff
Compare two UTF-8 text files as a unified diff.
Open tool UtilitiesChecksum Compare
Compare SHA-256 checksums for two files.
Open tool ArchiveCreate ZIP
Bundle multiple files into a single ZIP archive.
Open tool ArchiveExtract ZIP
Safely extract a ZIP archive's contents, protected against zip bombs.
Open tool PDFPDF to Text
Extract the full text of a PDF into a plain text file.
Open tool DocumentsCSV Merger & Deduplicator
Merge CSV files with matching headers and remove duplicate rows.
Open toolFast tools in your browser
JWT Decoder
Decode a JWT header and payload locally only; signature is unverified.
Open tool Browser-localQuery String Parser/Builder
Parse a query string or build one from key=value lines.
Open tool Browser-localHTML Entity Encode/Decode
Encode or decode HTML entities in your browser.
Open tool Browser-localUnicode Inspector/Escape Converter
Inspect Unicode code points or convert text to escapes.
Open tool Browser-localCron Expression Explainer
Explain a standard five-field cron expression.
Open tool Browser-localColor Contrast Checker
Check foreground and background contrast against WCAG.
Open tool Browser-localSemantic Version Comparator
Compare two semantic versions.
Open tool Browser-localText Secret Redactor
Hide visible emails, tokens, and keys locally before sharing text.
Open tool Browser-localURL Parser
Parse URL components locally.
Open tool Browser-localRegular Expression Tester
Test a JavaScript regular expression against text locally.
Open tool Browser-localHTTP Status Lookup
Show a short description for a common HTTP status code.
Open tool Browser-localCSS Unit Converter
Convert between px and rem using a root font size.
Open tool Browser-localText Difference Checker
Show added and removed lines between two texts.
Open tool Browser-localSlug Generator
Create a simple slug from a title.
Open tool Browser-localMIME Type Lookup
Look up a common MIME type for a file extension.
Open tool Browser-localIPv4 Address Converter
Convert an IPv4 address to decimal and back locally.
Open tool Browser-localLine Ending Converter
Convert text line endings to LF or CRLF.
Open tool Browser-localHTML Tag Stripper
Extract text from HTML locally.
Open tool Browser-localText Case Converter
Convert text to camelCase, snake_case, or kebab-case.
Open tool Browser-localDuplicate Line Remover
Remove duplicate lines while preserving order.
Open toolTools that run locally in your browser
JSON Formatter
Format and validate JSON locally in your browser.
Open tool Browser-localBase64 Encode / Decode
Encode text or decode Base64 without sending its contents.
Open tool Browser-localURL Encoder
Encode or decode URL components locally.
Open tool Browser-localUUID Generator
Generate random UUID v4 values locally.
Open tool Browser-localSHA-256 Generator
Calculate a SHA-256 text hash locally.
Open tool Browser-localTimestamp Converter
Convert Unix timestamps to global dates and back.
Open tool