Free & Open Developer Tools

All the developer tools
you need, in one place.

17+ free tools for encoding, hashing, formatting, testing APIs, generating icons, and more — all running in your browser for speed and privacy.

26
Tools
6
Categories
100%
Free

⚡ Most Popular Tools

The tools developers use the most, right at your fingertips.

Popular
API Tester (PostMan)
Send HTTP requests (GET, POST, PUT, DELETE) and inspect responses with headers.
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Popular
JSON to Kotlin Converter
Convert JSON to Kotlin data classes with DTO, Domain, and Mapper layers. Supports @Serializable annotations and ZIP download.
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Popular
JSON Formatter
Format, validate, and minify JSON data with syntax highlighting and error detection.
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Popular
SQLite DB Viewer
Open SQLite database files locally in your browser. View tables, run SQL queries, and export data.
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Popular
Base64 Encode/Decode
Convert text and files to/from Base64 encoding. Supports images, text, and binary data.
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🧰 All Tools

Browse tools by category to find exactly what you need.

Encoding & Decoding

Encode, decode, and convert data between formats

Popular
Base64 Encode/Decode
Convert text and files to/from Base64 encoding. Supports images, text, and binary data.
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JWT Decoder
Decode and inspect JSON Web Tokens. View header, payload, and verify signatures.
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URL Encoder/Decoder
Encode or decode URLs and query parameters. Handles special characters and Unicode.
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CyberChef Lite
Chain multiple encoding, decoding, and transformation operations together.
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Security & Hashing

Hash data, test SSL, and validate security

Hash Generator
Generate MD5, SHA-1, SHA-256, and SHA-512 hashes from text or file input.
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SSL Pinning Tester
Test SSL certificate details, pinning, and chain validity for any domain.
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Design & Theming

Generate colors, icons, and compress images

Color Palette Generator
Generate beautiful, harmonious color schemes for your apps and websites.
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Material Color Picker
Browse and pick colors from the full Material Design color palette.
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App Icon Generator
Upload an image and generate all required icon sizes for iOS and Android apps.
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Image Compressor
Compress PNG, JPG, and WebP images without noticeable quality loss.
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Code Utilities

Format, validate, test, and generate code

Popular
JSON Formatter
Format, validate, and minify JSON data with syntax highlighting and error detection.
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Code Beautifier
Beautify and format JSON, XML, HTML, CSS, and JavaScript code instantly.
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Regex Tester
Test regular expressions in real-time with match highlighting and group capture.
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Popular
JSON to Kotlin Converter
Convert JSON to Kotlin data classes with DTO, Domain, and Mapper layers. Supports @Serializable annotations and ZIP download.
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Lorem Ipsum Generator
Generate placeholder text in paragraphs, sentences, or words for your designs.
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Privacy Policy Generator
Generate a standard privacy policy for your website or app.
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Terms & Conditions Generator
Generate standard terms and conditions for your website or app.
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Networking & API

Test APIs, inspect headers, and debug requests

Popular
API Tester (PostMan)
Send HTTP requests (GET, POST, PUT, DELETE) and inspect responses with headers.
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HTTP Header Inspector
Fetch and display all HTTP response headers for any URL.
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Reverse Engineering

Analyze and inspect Android APK packages

APK & AAB Analyzer/Decompiler/Extractor/converter
Upload an APK or AAB file to inspect its internal structure, DEX files, resources, metadata, and extract files locally.
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AndroidManifest Decoder
Decode compiled binary AndroidManifest.xml and AXML files to readable XML format.
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APK Signer/Verifier
Verify Android application certificates (v1/v2/v3) and extract cryptographic signatures.
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ProGuard Deobfuscator
Deobfuscate Android crash logs and stack traces using your ProGuard/R8 mapping.txt file.
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iOS IPA Analyzer
Analyze iOS IPA files to view Info.plist details, app entitlements, and configuration.
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ELF / .so Inspector
Inspect compiled Android NDK native libraries (.so) and Linux ELF headers.
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Popular
SQLite DB Viewer
Open SQLite database files locally in your browser. View tables, run SQL queries, and export data.
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