Browse all available tools by category.
Format, validate, and beautify JSON data with syntax highlighting.
Send HTTP requests and organize collections in your browser. Share collections via end-to-end encrypted links — server never sees your data.
Encode text to Base64 or decode Base64 back to text.
Calculate Body Mass Index from height and weight. Shows WHO classification. 100% in-browser.
Estimate Basal Metabolic Rate using the Mifflin-St Jeor equation. Calories you burn at rest.
Estimate Total Daily Energy Expenditure from BMR and activity level. Plus maintenance and calorie-target suggestions.
Generate UUID v4 and v7 identifiers. Bulk generate and copy.
Decode QR codes from images or your webcam — entirely in your browser.
Generate placeholder text by paragraphs, sentences, or words.
Convert numbers between decimal, binary, hexadecimal, and octal.
Crop images with free or preset aspect ratios. Rotate, flip, and export as PNG, JPEG, or WebP.
Convert each PDF page to a PNG or JPG image. All processing happens in your browser.
Compare four published methods — Hamwi, Devine, Robinson, Miller — side by side.