Online converters for data, units, dates, and files

Encode text as Base64 for a data field, test fixture, or transport format. Unicode text is converted before encoding; the result is not encrypted.

Convert CSV rows into JSON objects with the available header and delimiter options. Inspect quoted fields and inferred types before using the output.

Create a QR code from a URL or text value. Review the encoded content and save the result for your document or design.

Convert a Unix timestamp to a date or a date to a timestamp. Check the expected time unit and timezone when comparing logs or API values.

Percent-encode text for URLs or decode an encoded value for inspection. Choose the operation that matches the component you are working with.

Calculate age from a birth date to a chosen date. Review the calendar years, months, and days alongside the tool's other time totals.

Calculate mean, median, mode, range, count, and sum from a list of numbers. Compare the summaries instead of relying on one average alone.

Decode a Base64 string to inspect its text content. Paste the encoded value and check whether the decoded bytes represent the text you expect.

Decode a Base64 image value, inspect its preview, and download the result. Check that the encoded bytes contain a supported image.

Calculate body mass index from metric or imperial height and weight. Read the result as an adult screening estimate, not an individual diagnosis.

Estimate body fat percentage from the supported circumference measurements. Use consistent units and read the method's limitations before interpreting the result.

Estimate BMR and daily energy expenditure from body measurements and an activity setting. Treat the output as an educational model, not a prescribed intake.

Estimate future value using an entered rate, compounding frequency, and regular contributions. Compare scenarios using the same assumptions.

Convert between CSV and JSON in one workspace. Choose the direction, delimiter, and available parsing options for the data you need.

Calculate the interval between two dates or add and subtract a date interval. Review calendar differences separately from total days.

Calculate a discounted price and savings from one or more entered discounts. Review the effective reduction when discounts are applied in sequence.

Calculate GPA from course grades and credit values. Choose the supported scale and review how each course contributes to the result.

Encode text as HTML entities or decode entity references into characters. Select the mode that matches the markup context you are inspecting.

Convert an image file into a Base64 data URI for an HTML, CSS, or data field. Inspect the output before embedding it.

Convert a JSON array of objects into CSV. Review fields, nesting, and delimiter settings, then inspect the exported rows.

Estimate payments and interest for an entered loan amount, rate, and term. Review the schedule and compare scenarios with consistent assumptions.

Estimate fixed-rate mortgage principal and interest payments. Compare the entered amount, rate, and term, then review the repayment breakdown.

Calculate a percentage, percentage change, or an increase or decrease. Choose the operation that matches the question and review its formula.

Run a focus timer with short and long breaks. Choose a preset or set durations that fit the session you want to complete.

Convert pixels to rem using the chosen root font size. Divide the pixel value by the base, then copy the result into your CSS workflow.

Convert rem to pixels using the chosen root font size. Multiply the rem value by the base and compare the result with your stylesheet.

Convert numbers to Roman numerals or read a numeral as a number. Review the supported range and subtractive notation in the breakdown.

Add an entered tax rate to a net price or extract tax from a gross total. Review the displayed formula and rounding convention.

Encode SVG markup as a Base64 or URL-encoded data URI. Compare the output forms and copy the one required by your HTML or CSS.

Convert a date and time between supported IANA time zones. Review the selected date because daylight-saving offsets can change throughout the year.

Calculate a tip and split a bill between people. Set the bill, tip rate, and party size, then review the per-person total.

Convert measurements between supported units of length, weight, volume, temperature, area, speed, and time. Select both units before entering a value.

Explore a daily water-volume estimate using the tool's body-weight and activity inputs. Read its assumptions and limits before using the result.