About CalcLab

CalcLab started as a Korean site of everyday calculators and grew into a set of free image and PDF tools. The English version brings the tools that are useful anywhere: loan, interest, percentage, date and health calculators, compressing and resizing photos, passport photos, merging, splitting and converting PDFs, and handy extras like a QR code generator, timer and word counter. Korea-only tax and labor calculators stay on the Korean site.

How we build tools

• Browser first. If a task can run on your device, it does, so your files stay private.
• No sign-up, no watermark. You get the full result for free.
• Honest limits. When a tool needs our server or has a daily limit, the page says so.

CalcLab is run by Sungbin. Suggestions and bug reports are welcome on the contact page.