Free online tools and calculators

Reduce photo file size to a target like 100KB. Files are processed in your browser and never sent to a server.

Change the width and height of photos while keeping the aspect ratio. Processed in your browser, never sent to a server.

Convert images between JPG, PNG and WebP. Processed in your browser, never sent to a server.

Work out DPI from pixels and print size, or the pixels you need for passport photos and prints. Processed in your browser, never sent to a server.

Combine several PDF files into one in the order you choose. Processed in your browser, never sent to a server.

Extract pages or split a PDF into separate files. Processed in your browser, never sent to a server.

Convert each page of a PDF into a JPG image. Processed in your browser, never sent to a server.

Turn JPG and PNG photos into a single PDF file. Processed in your browser, never sent to a server.

Calculate your body mass index and see your category under the WHO and Asian cut-offs.

Estimate your basal metabolic rate and daily calorie needs by activity level.

Find a healthy weight range for your height and see how far you are from it.

Find your due date and how many weeks pregnant you are from the first day of your last period.

Estimate ovulation days and your fertile window for the next three cycles.

Count days between dates, days until an event, and dates N days from today.

Count characters with and without spaces, words, lines and bytes. Your text never leaves your browser and is not sent to a server.

Compare monthly payments and total interest for amortized, equal-principal and interest-only loans.

Calculate the maturity amount of a deposit or monthly savings plan with simple or compound interest.