free dev tools that don't phone home
Everything runs in your browser tab. No signup, no ads, no telemetry on your input. Open DevTools → Network and watch nothing happen.
tools 14 backend none cost $0
JSON to CSV Converter
Convert JSON to CSV and back. 100% in your browser.
Regex Tester
Test, debug, and explain regular expressions.
QR Code Generator with Logo
Generate branded QR codes with a custom logo overlay.
Image Compressor
Compress JPG, PNG, and WebP without quality loss.
Image Size Converter
Resize JPG, PNG, and WebP to exact pixel dimensions.
JWT Decoder & Verifier
Decode and verify JSON Web Tokens (HS256, RS256, ES256) in your browser.
Markdown ↔ HTML Converter
Convert GitHub-flavored Markdown to HTML and back. Live preview, syntax highlighting.
EXIF Viewer & Stripper
Inspect and remove camera, GPS, and personal metadata from images. Lossless.
Color Picker & WCAG Contrast
Convert between hex, RGB, HSL, OKLCH, HWB. Check WCAG contrast. Extract palettes.
Favicon Generator
Generate a complete favicon set (ICO, PNG, manifest) from a single image.
JSON Formatter & Error Reviewer
Validate, pretty-print, and minify JSON. Pinpoint syntax errors by line and column.
JSON ↔ YAML Converter
Convert JSON to YAML and back. Kubernetes-friendly, block or flow style, sort keys.
Diff Checker
Compare two texts or JSON documents. Line, word, char, and JSON-aware modes.
Cron Expression Builder & Tester
Describe any cron expression in plain English and preview the next 10 fires in your timezone.
# why?
Most online converters upload your data, show three ad banners, and ask for an email. This site doesn't. Every tool here is a static page with a small script that runs in your browser. Your input never leaves your device. Pages are open-source and hosted on Cloudflare's edge so they load fast from anywhere.