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Development Tools
Free online development tools for formatting, validating, and transforming data directly in your browser.
Open JSON Formatter
JSON Formatter
Format, validate, and minify JSON instantly. Beautify JSON for readability, catch syntax errors, and copy clean output in one click.
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Open PDF to Markdown Converter
PDF to Markdown Converter
Convert PDF files to clean, readable Markdown text instantly in your browser - fast, client-side processing with full privacy and no uploads.
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Open Random UUID Generator
Random UUID Generator
Generate random UUID v4 values instantly. Create one or hundreds at once and copy them with a single click.
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Open Random VIN Generator
Random VIN Generator
Generate random but valid-looking Vehicle Identification Numbers (VINs) for testing and development.
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Open JWT Decoder
JWT Decoder
Decode JSON Web Tokens (JWT) to view header and payload claims instantly - optional HS256 signature verification.
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Open TOML ↔ JSON Converter
TOML ↔ JSON Converter
Convert TOML to JSON and JSON to TOML instantly - great for config files, tooling, and developer workflows.
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Open Print a Test Page
Print a Test Page
Print black and white, color, or CMYK printer test pages instantly to troubleshoot alignment, streaks, and color issues.
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FAQ
Are these development tools free?
Yes. All development tools on this site are free to use with no sign-up.
Do these development tools upload or store my data?
No. Tools run locally in your browser unless a tool explicitly says otherwise.
How do I use these development tools?
Open a tool, add your input (paste/type/upload if supported), choose options, then copy or download the result. Examples include: JSON Formatter (/tools/json-formatter), PDF to Markdown Converter (/tools/pdf-to-markdown), Random UUID Generator (/tools/random-uuid-generator).
Can I validate and format code or data here?
Yes—many developer tools support formatting and basic validation (for example JSON formatting/validation), right in your browser.
Does this work for large files or big inputs?
Usually yes, but very large inputs can be slower depending on your device and browser.