Developer
Formatters, encoders, decoders and generators for daily dev work.
38 tools
JSON Formatter
Format and beautify messy JSON online — 2 spaces, 4 spaces or tabs, with instant validation and precise error locations. 100% in your browser.
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JSON Minifier
Minify JSON online: strip all whitespace to shrink payloads for faster API responses and smaller storage — see the exact bytes saved, privately in your browser.
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JSON Validator
Validate JSON instantly with precise error line and column. Catch missing commas, unquoted keys, trailing commas and bad escapes before they break your app.
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XML Formatter
Beautify XML online with clean 2-space indentation — sitemaps, RSS feeds, SOAP envelopes and config files become readable again, right in your browser.
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XML Validator
Check XML for well-formedness in real time: mismatched tags, broken attributes and invalid entities are reported the moment you paste. Nothing is uploaded.
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HTML Formatter
Turn minified or one-line HTML into clean, indented markup — a simple, reliable beautifier for emails, templates and saved pages. 100% client-side.
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HTML Minifier
Minify HTML in your browser: strip comments and collapse whitespace to cut page weight — a conservative cleaner that keeps your markup and rendering intact.
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CSS Minifier
Minify CSS online: remove comments and needless spaces to cut stylesheet size for faster loads. Instant, private, and safe for your rules.
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JavaScript Minifier
A conservative JavaScript minifier: strips comments and collapses blank lines, keeping line breaks — no risky rewrites, your code semantics stay untouched.
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SQL Formatter
Format SQL online with consistent keyword casing and indentation — turn long SELECTs, JOINs and stored procedures into readable code, right in your browser.
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Base64 Encoder
Encode text to Base64 instantly with full UTF-8 support — emojis, accents and CJK characters survive intact. Free, private, nothing ever leaves your browser.
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Base64 Decoder
Decode Base64 back into readable text with proper UTF-8 handling — data URIs, API payloads and encoded config values become clear instantly. Private and free.
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URL Encoder
Percent-encode URLs and query strings online — choose component encoding or full URI encoding, with live output for links, parameters and path segments.
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URL Decoder
Decode percent-encoded URLs back into readable text — %20, %2F and query-string values become clear instantly. Handles + as space, fully in your browser.
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JWT Decoder
Decode JWT tokens online: inspect the header and payload claims with human-readable exp and iat timestamps. Decoding only — nothing is verified or uploaded.
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UUID Generator
Generate random UUID v4 identifiers in bulk with one click — 1 to 500 at a time, using your browser's cryptographic randomness. Free, instant, offline-capable.
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Hash Generator
Compute SHA-1, SHA-256, SHA-384, SHA-512 or MD5 hashes of text or files, right in your browser. Fast checksums for integrity checks — nothing uploaded.
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MD5 Generator
Generate MD5 hashes of any text or file instantly in your browser — perfect for checksums, dedup keys and legacy integrations. One-way, never uploaded.
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SHA-256 Generator
Calculate SHA-256 hashes of text or files online using native WebCrypto — the standard choice for integrity checks and fingerprints. 100% client-side.
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Regex Tester
Test regular expressions live: highlight every match as you type, inspect capture groups and debug patterns for JavaScript, with common flags one click away.
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JSON to CSV
Convert JSON arrays of objects to CSV with correct quoting and escaping — spreadsheet-ready for Excel, Sheets or database import. Fully in-browser.
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CSV to JSON
Convert CSV to JSON with automatic type inference — numbers, booleans and nulls are detected, quoted fields handled. Paste, convert, copy. Nothing uploaded.
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CSV to Excel
Convert CSV to a real .xlsx spreadsheet in your browser — auto-detects comma, semicolon or tab delimiters, keeps quotes and line breaks intact.
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Excel to CSV
Turn any .xlsx or .xls workbook into clean CSV — pick a sheet, choose the delimiter, and download. Quoting, commas and line breaks are escaped correctly.
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Markdown Previewer
Preview Markdown as clean, sanitized HTML while you type — headings, lists, tables, code and links rendered live. Perfect for READMEs, docs and comments.
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HTML Escape / Unescape
Escape or unescape HTML entities live as you type: & < > and quotes become safe references, with an optional numeric mode for non-ASCII characters.
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URL Parser
Paste any URL and see it decomposed live: protocol, host, port, each path segment, decoded query parameters and hash — with copy as JSON.
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HTTP Status Codes
A searchable reference of 56 HTTP status codes grouped by class, each explained in one plain sentence — click any row to copy the number.
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Base64 Image
Convert images to base64 data URLs and back — preview, validate and download, with an exact size comparison. Everything runs in your browser.
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HTML to Markdown
Turn HTML into clean Markdown while you type — headings, lists, links, images and code, with ATX or Setext headings and your pick of bullet marker.
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XML to JSON
Convert XML to JSON in your browser — attributes become @-keys, repeated elements become arrays, and malformed input gets a friendly line-level error.
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JSON to XML
Convert JSON to well-formed XML with attributes, repeated elements and correct escaping — round-trips with our XML to JSON tool. All local, all instant.
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Placeholder Image Generator
Generate placeholder images of any size in SVG, PNG or JPG — pick colors and a label, preview instantly, then download the file or copy the SVG markup.
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Cron Explainer
Turn any cron expression into plain language: a field-by-field breakdown, the next five run times in your timezone, and one-click presets.
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JSON to TypeScript
Generate TypeScript interfaces from any JSON — nested objects, arrays and unions, ready to paste into your project.
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JSON Diff
Compare two JSON documents path by path — added, removed and changed keys with before/after values, all locally.
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JSON Path Query
Extract any value from JSON with a path like $.user.name or $.items[0].id — instant, forgiving, no jq syntax to learn.
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JSON ⇄ YAML Converter
Convert JSON to YAML and back — config-file ready, with a swap-to-continue workflow and precise error messages.
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