Get your file accepted, first try
Exact pixel size, an exact KB range — including the minimum, which is what actually gets uploads rejected and which almost every other tool ignores. 117 free tools to merge, compress, and convert PDFs, photos, and documents, all running in your browser.
Fix a photo for an upload form →Don't take our word for it — turn off your Wi-Fi. Docexp keeps working. A site that runs with the network off cannot be uploading your files anywhere.
Free Number Tools
Convert between number formats and bases and run quick calculations, all computed instantly on your device.
- Length converterConvert between metric and imperial length units.
- Weight converterConvert between metric and imperial weight units.
- Data storage converterConvert between bits, bytes, and their multiples.
- Speed converterConvert between common speed units.
- Time duration converterConvert between seconds, minutes, hours, and more.
- Area converterConvert between metric and imperial area units.
- Volume converterConvert between metric and imperial volume units.
- Temperature converterConvert between Celsius, Fahrenheit, and Kelvin.
- Number base converterConvert a number between binary, octal, decimal, and hexadecimal.
- Percentage calculatorWhat is X% of Y, and what percent is X of Y.
- BMI calculatorEstimate Body Mass Index from height and weight.
- Color format converterConvert a color between HEX, RGB, and HSL.
Frequently asked questions
Do calculators like the BMI calculator send my numbers anywhere?
No — the arithmetic happens in the page itself. Nothing you type into any converter or calculator is transmitted or stored.
Can I convert between binary, decimal, and hexadecimal?
Yes — the number base converter takes a value in binary, octal, decimal, or hex and shows it in all four at once, validating the digits against the base you picked so a typo is flagged instead of silently misread.
Why do unit converters sometimes disagree with other sites?
Usually rounding, occasionally definitions. Display rounding differs between tools, and a few units genuinely have more than one definition — a US gallon is 3.785 litres while an imperial gallon is 4.546. When two answers differ by a few percent, check which definition each side used.