Free tools that run in your browser.
Fast, private utilities for files and downloads. Everything runs locally — your files never leave your device, and nothing is uploaded to us.
Verification
Checksum & Hash Calculator
MD5, SHA-1, SHA-256 & SHA-512 of any file or text. Verify a download against its published checksum.
BandwidthDownload Time Calculator
Estimate transfer time from a file size and your connection speed.
UnitsFile Size Converter
Convert between B, KB, MB, GB, TB and binary KiB / MiB / GiB units.
EncodingBase64 Encoder / Decoder
Encode text to Base64 or decode it back, with full UTF-8 support.
EncodingURL Encoder / Decoder
Percent-encode text for URLs, or decode an encoded URL back to text.
FormatJSON Formatter / Validator
Pretty-print, validate, or minify JSON. Clear error messages.
GenerateQR Code Generator
Make a QR code from any text or link; download as PNG or SVG.