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Developer Tools

40+ utilities for builders.

Format, validate, convert, encode, hash, generate. Everything you Google five times a week, in one place.

42free tools · No upload · No sign-up
Jump to
  • Format & Validate7
  • Encode & Hash8
  • Generate5
  • Convert6
  • Minify & Beautify6
  • Reference & Utilities10

About Developer Tools

Developer Tools collect the utilities engineers open twenty times a week — without pasting production payloads into anonymous playgrounds that keep history. Format and validate JSON, XML, YAML, and SQL. Encode/decode Base64 and URLs; inspect JWTs; hash with SHA-256 or MD5. Generate UUIDs, passwords, slugs, and lorem text. Convert CSV/JSON and HTML/Markdown; minify or beautify CSS/JS/HTML. Reference helpers cover regex, diffs, markdown preview, cron, timestamps, colors, HTTP status, MIME types, IP lookup, and user-agent parsing. Topic clusters: JSON Formatter + Diff Checker for API reviews; JWT Decoder + Base64 for auth debugging; Regex Tester + Word Counter for content pipelines. Everything runs client-side so staging secrets and customer samples stay local.

Exploring alternatives? Read how Toolncy compares on our comparison guides, or browse the workflow blog.

Format & Validate

7 tools
JSON Formatter
Pretty-print and validate JSON.
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JSON Validator
Spot JSON errors instantly.
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XML Formatter
Pretty-print XML.
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XML Validator
Validate XML against schema.
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YAML Formatter
Format YAML cleanly.
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YAML Validator
Validate YAML syntax.
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SQL Formatter
Format SQL queries.
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Encode & Hash

8 tools
Base64 Encoder
Encode text or files to Base64.
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Base64 Decoder
Decode Base64 strings.
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URL Encoder
Encode URLs safely.
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URL Decoder
Decode URL-encoded strings.
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JWT Decoder
Decode JSON Web Tokens.
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JWT Encoder
Encode signed JWTs.
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SHA256 Generator
Hash text with SHA-256.
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MD5 Generator
Generate MD5 hashes.
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Generate

5 tools
UUID Generator
Generate UUIDs in bulk.
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Password Generator
Strong, random passwords.
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Lorem Ipsum
Placeholder text generator.
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Slug Generator
Generate URL slugs.
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QR Code Generator
Branded QR codes.
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Convert

6 tools
CSV to JSON
Convert CSV to JSON.
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JSON to CSV
Convert JSON to CSV.
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HTML to Markdown
Convert HTML to Markdown.
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Markdown to HTML
Convert Markdown to HTML.
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Color Converter
HEX, RGB, HSL conversions.
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Timestamp Converter
Unix ↔ human time.
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Minify & Beautify

6 tools
CSS Minifier
Minify CSS for production.
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JS Minifier
Minify JavaScript.
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HTML Minifier
Minify HTML markup.
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CSS Beautifier
Beautify minified CSS.
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JS Beautifier
Beautify minified JS.
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HTML Beautifier
Beautify HTML.
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Reference & Utilities

10 tools
Regex Tester
Test regex against samples live.
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Diff Checker
Compare two text blocks.
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Markdown Preview
Live markdown renderer.
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Cron Parser
Decode cron expressions.
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Character Counter
Count chars, words, lines.
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Word Counter
Word and reading-time counter.
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HTTP Status Codes
Searchable HTTP status reference.
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MIME Type Lookup
Look up MIME types.
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IP Lookup
View your public IP details.
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User Agent Parser
Parse user-agent strings.
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Other categories

PDF Tools
Merge, split, compress, edit, sign, and secure PDFs entirely in your browser. No upload. No file limit.
Image Tools
A complete image toolkit. Convert formats, compress, resize for social, edit pixels — all client-side.
OCR Suite
OCR for PDFs, images, handwriting, tables, invoices, receipts, and IDs. Powered by Tesseract running locally.
Scan Studio
Presets, paper tints, fold marks, coffee stains, and full live preview. The most polished scan generator on the web.
Document Tools
Build resumes, invoices, receipts, and certificates. Compare docs. Strip metadata before sharing.
Toolncy

Every file tool. Free. Private. Instant. Built for the open web.

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