Tools

Edit, validate and explore JSON as text, trees or tables, and export YAML or data models.

Convert JSON Lines (NDJSON) to a JSON array and back while preserving exact numbers.

Convert UTF-8 text or hexadecimal bytes using Base32 or Base32hex.

Encode and decode UTF-8 text with Base64.

Encode and decode URL components locally.

Escape and unescape HTML entities as plain text.

Convert UTF-8 text to hexadecimal and back.

Calculate SHA, Keccak, SHA3, RIPEMD-160 and MD5 digests or HMAC locally.

Convert Unix timestamps and dates in any IANA time zone, individually or in batches.

Convert integers between binary, octal, decimal and hexadecimal.

Generate version 4 or time-ordered version 7 UUIDs locally.

Generate random passwords with configurable length.

Test JavaScript regular expressions against text.

Count characters and lines, change case and remove duplicate lines.

Check the WCAG 2.2 text contrast of two colors.

Convert HEX, RGB and HSL colors and preview the result.

Calculate date differences or add days, weeks, months and years.

Resize and convert images to PNG, JPEG or WebP without uploading.

Convert length, mass, temperature and nine other unit categories.

Calculate IPv4 network ranges, masks and address counts from CIDR.

Calculate the network prefix, address range and exact address count of an IPv6 subnet.

Add, subtract, multiply and divide fractions exactly.

Compare two texts line by line locally.

Find shared, unique or missing items across two line-separated lists.

Convert CSV tables and JSON object arrays locally.

Create a QR code for text or a URL without uploading.

Preview Markdown safely and export HTML locally.

Look up the country, network and available location information for a public IP address.

Query public DNS records for a domain name.

Look up public domain registration information using RDAP.

Convert currencies using the latest available reference exchange rate.

Convert BTC/satoshi, ETH/Gwei/wei and custom token units exactly in your browser.

Calculate the quantity-weighted average price across spot purchases and include fees paid in the quote currency.

Calculate linear long or short trading PnL, fees, initial margin and break-even prices locally.

Calculate net profit and the break-even sell price after trading and withdrawal fees.

Calculate a position size from account equity, risk budget, stop price and trading fees.

Estimate fixed-rate funding payments for a linear perpetual position using your own inputs.

Compare a 50/50 constant-product liquidity position with holding the same two tokens.

Calculate circulating market cap, total-supply valuation, maximum-supply FDV and implied token prices.

Validate public EVM, Bitcoin, Solana and TRON address formats locally.

Estimate Ethereum execution gas fees using EIP-1559 or legacy pricing, entirely locally.

Merge, split, crop, resize, watermark and number PDF pages, edit metadata, or convert images to PDF locally.

Create ZIP archives, extract individual files, and compress or expand GZIP entirely in your browser.

Convert YAML and JSON locally while preserving exact numeric literals.

Format JavaScript, TypeScript, HTML and CSS locally with configurable style.

Inspect a compact JWT header, payload and time claims locally without uploading the token.

Calculate upcoming cron occurrences with an explicit time zone, entirely in your browser.

Encode and decode ABI parameters and function calldata, and compute selectors or event topics locally.

Encrypt and decrypt text or files locally with password-based AES-256-GCM.

Encode, decode and inspect Unicode text, UTF-16 escapes, code points and UTF-8 bytes locally.

Inspect URL components and repeated query parameters without visiting the address.

Generate cryptographically random integers with exact large bounds, optional uniqueness and sorting.

Calculate arithmetic expressions, powers, factorials and scientific functions locally.

Convert Simplified and Traditional Chinese with explicit Taiwan and Hong Kong variants locally.

Convert Chinese text to pinyin or initials with tone marks, tone numbers or no tones.

Convert exact Arabic numbers, Chinese numerals and RMB amount text without rounding.

Compare JSON values with exact numbers, escaped paths and a downloadable structural change report.

Add watermarks and captions, create grayscale or pixel images, split nine-grid tiles, and export ASCII art locally.

Compress PNG, JPEG and WebP images locally with quality, dimension and optional file-size targets.

Format or compact SQL locally with dialect, indentation and keyword case controls.

Parse User-Agent strings locally to inspect declared browser, engine, operating system and device details.

Format, minify and validate XML locally while preserving mixed text, CDATA and namespaces.

Create multi-size ICO icons, PNGs and icon ZIPs locally with favicon and common app size presets.

Generate local PNG and SVG placeholder images with custom dimensions, text and colors.

Generate CODE128, EAN13, EAN8, UPC and CODE39 barcodes locally as SVG or PNG.

Convert PNG, JPEG and WebP files to base64 data URLs and restore validated raster images locally.

Preview portable file names and export renamed copies as a ZIP locally.

Convert UTF-8 SRT, WebVTT, ASS and SSA captions to plain SRT or WebVTT with a time offset.

Inspect v1 torrent metadata, compute its original info hash and create a magnet link without networking.

Extract the original ZIP from a local CRX2 or CRX3 file with bounded archive validation.

Convert a literal curl request into JavaScript Fetch, Python requests or Go net/http code locally.

Generate and verify Apache bcrypt password entries locally with random salts and UTF-8 length checks.

Minify JavaScript, CSS or HTML locally without running it or fetching its resources.

Convert internationalized domain names between Unicode and validated ASCII labels locally, one name or a batch.

Encode and decode international Morse or an explicit reversible UTF-8 byte mode locally.

Generate Markdown, ASCII and HTML tables from CSV, TSV or JSON locally, preserving exact JSON number literals.

Inspect the first 4096 bytes of a local file or HEX data to identify candidate file formats.

Search bundled IANA HTTP status codes, classes and registry descriptions locally.