Top 10 Free Online Developer Tools Every Programmer Needs in 2025

Encoders & Decoders

Formatters & Linters

Base64 Encoder / Decoder URL Encoder / Decoder HTML Entity Encoder JWT Decoder & Verifier Hash Generator Base64 Image Encoder Base64 Image Decoder GZIP Compress / Decompress Text Escape / Unescape Backslash Escape / Unescape Bcrypt Hash Generator HMAC Generator AES Encrypt / Decrypt PDF Signature Checker Base32 Encoder / Decoder Punycode Encoder / Decoder Morse Code Translator Hex String Encoder / Decoder PBKDF2 Key Generator Base58 Encoder / Decoder

JSON Formatter SQL Formatter Markdown Previewer Code Minifier Diff Checker Regex Tester XML Formatter CSS Formatter / Minifier HTML Formatter / Minifier JSONPath Tester JSON Schema Validator HTML WYSIWYG Editor JSON Diff YAML Formatter Nginx Config Formatter .env File Formatter GraphQL Formatter Dockerfile Linter Markdown Linter

Password Generator UUID Generator Lorem Ipsum Generator Random Name Generator Slug Generator CSS Gradient Generator Cron Expression Parser QR Code Generator RSA Key Pair Generator Chmod Calculator Markdown Table Generator Token / API Key Generator ULID Generator BIP39 Passphrase Generator OTP / TOTP Generator Basic Auth Header Generator Open Graph Meta Generator Random Port Generator WiFi QR Code Generator SVG Placeholder Generator Camera Recorder MAC Address Generator IPv6 ULA Generator SSH Key Generator CORS Header Generator Placeholder Data Generator Sitemap XML Generator CSS Box Shadow Generator Flexbox Playground CSS Grid Generator Color Palette Generator JWT Token Generator robots.txt Generator .htaccess Generator Barcode Generator

HEX ↔ RGB Converter Color Picker & Converter Timestamp Converter CSV to JSON Converter JSON ↔ YAML Converter XML ↔ JSON Converter JSON to TypeScript HTML to JSX Converter Number Base Converter TOML ↔ JSON Converter SQL to MongoDB Converter Epoch Batch Converter Docker Run → Compose Text ↔ Binary / Hex Roman Numeral Converter Case Converter Text to NATO Alphabet Text to Unicode YAML ↔ TOML Converter List Converter Markdown to HTML Temperature Converter WebP Image Converter SVG to PNG Converter Charset Converter JSON to Go Struct JSON to CSV Converter Image Cropper & Resizer Favicon Generator Color Blindness Simulator

Word Counter Character Counter HTTP Status Code Reference ASCII Art Generator IP Subnet Calculator Regex Cheat Sheet Password Strength Analyzer Math Expression Evaluator ETA Calculator Percentage Calculator MIME Type Lookup User Agent Parser Phone Number Parser IPv4 Range Expander URL Parser Device Information Keycode Info Outlook Safelink Decoder Git Cheatsheet Email Normalizer IPv4 Address Converter MAC Address Lookup Chronometer Benchmark Builder Emoji Picker String Obfuscator Numeronym Generator IBAN Validator cURL Command Builder HTTP Header Parser Aspect Ratio Calculator

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Konvertio.

Free developer tools — encoders, formatters, generators & more. No signup, no data processing on our servers.

Encoders

Base64 Encoder JWT Decoder AES Encrypt HMAC Generator Hash Generator

Formatters

JSON Formatter SQL Formatter XML Formatter CSS Formatter JSONPath Tester

Generators

Password Generator QR Code Token Generator UUID Generator OTP Generator

Converters

JSON ↔ YAML JSON → TypeScript HTML → JSX Docker → Compose SQL → MongoDB

Text Tools

Word Counter HTTP Status Codes Password Strength Math Evaluator MIME Lookup

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Top 10 Free Online Developer Tools Every Programmer Needs in 2025