Free tools

Free tools that respect your data

Every tool on this page runs entirely in your browser: no upload, no account, no tracking of your content. Use them as much as you like.

AI tools

Count tokens and estimate AI API costs

Words, characters, sentences and reading time

UPPER, lower, Title, Sentence, camelCase and more

Convert Markdown to clean HTML with live preview

Format, validate and minify JSON

Encode and decode Base64 text

Percent-encode and decode URLs and queries

Convert between HEX, RGB and HSL

Generate random v4 UUIDs in bulk

Strong random passwords with your rules

Convert PNG, JPG and WebP privately

Solve widths and heights for any ratio

A free Seren account adds every frontier model, image generation, translation in 133 languages and more, with free monthly credits.

Free plan included. No credit card required.