Free tools.
Small, focused, embeddable. No signup, no ads, no AI training on your inputs.
Upload time calculator
How long a file takes to upload at a given speed. Picks the realistic number, not the marketing one.
Email attachment size limits
Every major email and messaging service's file size cap, in a single sortable table.
File size converter
Convert between bytes, kilobytes, megabytes, gigabytes, terabytes. Binary or decimal.